data_2ZZO
# 
_entry.id   2ZZO 
# 
_audit_conform.dict_name       mmcif_pdbx.dic 
_audit_conform.dict_version    5.397 
_audit_conform.dict_location   http://mmcif.pdb.org/dictionaries/ascii/mmcif_pdbx.dic 
# 
loop_
_database_2.database_id 
_database_2.database_code 
_database_2.pdbx_database_accession 
_database_2.pdbx_DOI 
PDB   2ZZO         pdb_00002zzo 10.2210/pdb2zzo/pdb 
RCSB  RCSB028627   ?            ?                   
WWPDB D_1000028627 ?            ?                   
# 
loop_
_pdbx_audit_revision_history.ordinal 
_pdbx_audit_revision_history.data_content_type 
_pdbx_audit_revision_history.major_revision 
_pdbx_audit_revision_history.minor_revision 
_pdbx_audit_revision_history.revision_date 
1 'Structure model' 1 0 2009-08-04 
2 'Structure model' 1 1 2011-07-13 
3 'Structure model' 1 2 2021-11-10 
4 'Structure model' 1 3 2023-11-01 
5 'Structure model' 1 4 2024-10-16 
# 
_pdbx_audit_revision_details.ordinal             1 
_pdbx_audit_revision_details.revision_ordinal    1 
_pdbx_audit_revision_details.data_content_type   'Structure model' 
_pdbx_audit_revision_details.provider            repository 
_pdbx_audit_revision_details.type                'Initial release' 
_pdbx_audit_revision_details.description         ? 
_pdbx_audit_revision_details.details             ? 
# 
loop_
_pdbx_audit_revision_group.ordinal 
_pdbx_audit_revision_group.revision_ordinal 
_pdbx_audit_revision_group.data_content_type 
_pdbx_audit_revision_group.group 
1 2 'Structure model' 'Version format compliance' 
2 3 'Structure model' 'Database references'       
3 3 'Structure model' 'Derived calculations'      
4 4 'Structure model' 'Data collection'           
5 4 'Structure model' 'Refinement description'    
6 5 'Structure model' 'Structure summary'         
# 
loop_
_pdbx_audit_revision_category.ordinal 
_pdbx_audit_revision_category.revision_ordinal 
_pdbx_audit_revision_category.data_content_type 
_pdbx_audit_revision_category.category 
1 3 'Structure model' database_2                    
2 3 'Structure model' struct_conn                   
3 3 'Structure model' struct_ref_seq_dif            
4 4 'Structure model' chem_comp_atom                
5 4 'Structure model' chem_comp_bond                
6 4 'Structure model' pdbx_initial_refinement_model 
7 5 'Structure model' pdbx_entry_details            
8 5 'Structure model' pdbx_modification_feature     
# 
loop_
_pdbx_audit_revision_item.ordinal 
_pdbx_audit_revision_item.revision_ordinal 
_pdbx_audit_revision_item.data_content_type 
_pdbx_audit_revision_item.item 
1 3 'Structure model' '_database_2.pdbx_DOI'                
2 3 'Structure model' '_database_2.pdbx_database_accession' 
3 3 'Structure model' '_struct_conn.pdbx_leaving_atom_flag' 
4 3 'Structure model' '_struct_ref_seq_dif.details'         
# 
_pdbx_database_status.status_code                     REL 
_pdbx_database_status.entry_id                        2ZZO 
_pdbx_database_status.recvd_initial_deposition_date   2009-02-20 
_pdbx_database_status.deposit_site                    PDBJ 
_pdbx_database_status.process_site                    PDBJ 
_pdbx_database_status.status_code_sf                  REL 
_pdbx_database_status.status_code_mr                  ? 
_pdbx_database_status.SG_entry                        ? 
_pdbx_database_status.pdb_format_compatible           Y 
_pdbx_database_status.status_code_cs                  ? 
_pdbx_database_status.status_code_nmr_data            ? 
_pdbx_database_status.methods_development_category    ? 
# 
loop_
_audit_author.name 
_audit_author.pdbx_ordinal 
'Watabe, T.'  1 
'Nakano, H.'  2 
'Nakatsu, T.' 3 
'Kato, H.'    4 
'Fujii, N.'   5 
# 
_citation.id                        primary 
_citation.title                     'X-ray crystallographic study of an HIV-1 fusion inhibitor with the gp41 S138A substitution' 
_citation.journal_abbrev            J.Mol.Biol. 
_citation.journal_volume            392 
_citation.page_first                657 
_citation.page_last                 665 
_citation.year                      2009 
_citation.journal_id_ASTM           JMOBAK 
_citation.country                   UK 
_citation.journal_id_ISSN           0022-2836 
_citation.journal_id_CSD            0070 
_citation.book_publisher            ? 
_citation.pdbx_database_id_PubMed   19616557 
_citation.pdbx_database_id_DOI      10.1016/j.jmb.2009.07.027 
# 
loop_
_citation_author.citation_id 
_citation_author.name 
_citation_author.ordinal 
_citation_author.identifier_ORCID 
primary 'Watabe, T.'   1  ? 
primary 'Terakawa, Y.' 2  ? 
primary 'Watanabe, K.' 3  ? 
primary 'Ohno, H.'     4  ? 
primary 'Nakano, H.'   5  ? 
primary 'Nakatsu, T.'  6  ? 
primary 'Kato, H.'     7  ? 
primary 'Izumi, K.'    8  ? 
primary 'Kodama, E.'   9  ? 
primary 'Matsuoka, M.' 10 ? 
primary 'Kitaura, K.'  11 ? 
primary 'Oishi, S.'    12 ? 
primary 'Fujii, N.'    13 ? 
# 
loop_
_entity.id 
_entity.type 
_entity.src_method 
_entity.pdbx_description 
_entity.formula_weight 
_entity.pdbx_number_of_molecules 
_entity.pdbx_ec 
_entity.pdbx_mutation 
_entity.pdbx_fragment 
_entity.details 
1 polymer syn 'Transmembrane protein' 4152.843 1  ? ?     'GP41 FRAGMENT N36, UNP residues 546-581'            ? 
2 polymer syn 'Transmembrane protein' 4261.615 1  ? S138A 'FUSION INHIBITOR PEPTIDE C34, UNP residues 628-661' ? 
3 water   nat water                   18.015   27 ? ?     ?                                                    ? 
# 
loop_
_entity_name_com.entity_id 
_entity_name_com.name 
1 'TM, Glycoprotein 41, gp41' 
2 'TM, Glycoprotein 41, gp41' 
# 
loop_
_entity_poly.entity_id 
_entity_poly.type 
_entity_poly.nstd_linkage 
_entity_poly.nstd_monomer 
_entity_poly.pdbx_seq_one_letter_code 
_entity_poly.pdbx_seq_one_letter_code_can 
_entity_poly.pdbx_strand_id 
_entity_poly.pdbx_target_identifier 
1 'polypeptide(L)' no yes '(ACE)SGIVQQQNNLLRAIEAQQHLLQLTVWGIKQLQARIL' XSGIVQQQNNLLRAIEAQQHLLQLTVWGIKQLQARIL N ? 
2 'polypeptide(L)' no yes '(ACE)WMEWDREINNYTSLIHSLIEEAQNQQEKNEQELL'   XWMEWDREINNYTSLIHSLIEEAQNQQEKNEQELL   C ? 
# 
_pdbx_entity_nonpoly.entity_id   3 
_pdbx_entity_nonpoly.name        water 
_pdbx_entity_nonpoly.comp_id     HOH 
# 
loop_
_entity_poly_seq.entity_id 
_entity_poly_seq.num 
_entity_poly_seq.mon_id 
_entity_poly_seq.hetero 
1 1  ACE n 
1 2  SER n 
1 3  GLY n 
1 4  ILE n 
1 5  VAL n 
1 6  GLN n 
1 7  GLN n 
1 8  GLN n 
1 9  ASN n 
1 10 ASN n 
1 11 LEU n 
1 12 LEU n 
1 13 ARG n 
1 14 ALA n 
1 15 ILE n 
1 16 GLU n 
1 17 ALA n 
1 18 GLN n 
1 19 GLN n 
1 20 HIS n 
1 21 LEU n 
1 22 LEU n 
1 23 GLN n 
1 24 LEU n 
1 25 THR n 
1 26 VAL n 
1 27 TRP n 
1 28 GLY n 
1 29 ILE n 
1 30 LYS n 
1 31 GLN n 
1 32 LEU n 
1 33 GLN n 
1 34 ALA n 
1 35 ARG n 
1 36 ILE n 
1 37 LEU n 
2 1  ACE n 
2 2  TRP n 
2 3  MET n 
2 4  GLU n 
2 5  TRP n 
2 6  ASP n 
2 7  ARG n 
2 8  GLU n 
2 9  ILE n 
2 10 ASN n 
2 11 ASN n 
2 12 TYR n 
2 13 THR n 
2 14 SER n 
2 15 LEU n 
2 16 ILE n 
2 17 HIS n 
2 18 SER n 
2 19 LEU n 
2 20 ILE n 
2 21 GLU n 
2 22 GLU n 
2 23 ALA n 
2 24 GLN n 
2 25 ASN n 
2 26 GLN n 
2 27 GLN n 
2 28 GLU n 
2 29 LYS n 
2 30 ASN n 
2 31 GLU n 
2 32 GLN n 
2 33 GLU n 
2 34 LEU n 
2 35 LEU n 
# 
loop_
_pdbx_entity_src_syn.entity_id 
_pdbx_entity_src_syn.pdbx_src_id 
_pdbx_entity_src_syn.pdbx_alt_source_flag 
_pdbx_entity_src_syn.pdbx_beg_seq_num 
_pdbx_entity_src_syn.pdbx_end_seq_num 
_pdbx_entity_src_syn.organism_scientific 
_pdbx_entity_src_syn.organism_common_name 
_pdbx_entity_src_syn.ncbi_taxonomy_id 
_pdbx_entity_src_syn.details 
1 1 sample ? ? ? ? ? 'PEPTIDE SYNTHESIS' 
2 1 sample ? ? ? ? ? 'PEPTIDE SYNTHESIS' 
# 
loop_
_chem_comp.id 
_chem_comp.type 
_chem_comp.mon_nstd_flag 
_chem_comp.name 
_chem_comp.pdbx_synonyms 
_chem_comp.formula 
_chem_comp.formula_weight 
ACE non-polymer         . 'ACETYL GROUP'  ? 'C2 H4 O'        44.053  
ALA 'L-peptide linking' y ALANINE         ? 'C3 H7 N O2'     89.093  
ARG 'L-peptide linking' y ARGININE        ? 'C6 H15 N4 O2 1' 175.209 
ASN 'L-peptide linking' y ASPARAGINE      ? 'C4 H8 N2 O3'    132.118 
ASP 'L-peptide linking' y 'ASPARTIC ACID' ? 'C4 H7 N O4'     133.103 
GLN 'L-peptide linking' y GLUTAMINE       ? 'C5 H10 N2 O3'   146.144 
GLU 'L-peptide linking' y 'GLUTAMIC ACID' ? 'C5 H9 N O4'     147.129 
GLY 'peptide linking'   y GLYCINE         ? 'C2 H5 N O2'     75.067  
HIS 'L-peptide linking' y HISTIDINE       ? 'C6 H10 N3 O2 1' 156.162 
HOH non-polymer         . WATER           ? 'H2 O'           18.015  
ILE 'L-peptide linking' y ISOLEUCINE      ? 'C6 H13 N O2'    131.173 
LEU 'L-peptide linking' y LEUCINE         ? 'C6 H13 N O2'    131.173 
LYS 'L-peptide linking' y LYSINE          ? 'C6 H15 N2 O2 1' 147.195 
MET 'L-peptide linking' y METHIONINE      ? 'C5 H11 N O2 S'  149.211 
SER 'L-peptide linking' y SERINE          ? 'C3 H7 N O3'     105.093 
THR 'L-peptide linking' y THREONINE       ? 'C4 H9 N O3'     119.119 
TRP 'L-peptide linking' y TRYPTOPHAN      ? 'C11 H12 N2 O2'  204.225 
TYR 'L-peptide linking' y TYROSINE        ? 'C9 H11 N O3'    181.189 
VAL 'L-peptide linking' y VALINE          ? 'C5 H11 N O2'    117.146 
# 
loop_
_pdbx_poly_seq_scheme.asym_id 
_pdbx_poly_seq_scheme.entity_id 
_pdbx_poly_seq_scheme.seq_id 
_pdbx_poly_seq_scheme.mon_id 
_pdbx_poly_seq_scheme.ndb_seq_num 
_pdbx_poly_seq_scheme.pdb_seq_num 
_pdbx_poly_seq_scheme.auth_seq_num 
_pdbx_poly_seq_scheme.pdb_mon_id 
_pdbx_poly_seq_scheme.auth_mon_id 
_pdbx_poly_seq_scheme.pdb_strand_id 
_pdbx_poly_seq_scheme.pdb_ins_code 
_pdbx_poly_seq_scheme.hetero 
A 1 1  ACE 1  34  34  ACE ACE N . n 
A 1 2  SER 2  35  35  SER SER N . n 
A 1 3  GLY 3  36  36  GLY GLY N . n 
A 1 4  ILE 4  37  37  ILE ILE N . n 
A 1 5  VAL 5  38  38  VAL VAL N . n 
A 1 6  GLN 6  39  39  GLN GLN N . n 
A 1 7  GLN 7  40  40  GLN GLN N . n 
A 1 8  GLN 8  41  41  GLN GLN N . n 
A 1 9  ASN 9  42  42  ASN ASN N . n 
A 1 10 ASN 10 43  43  ASN ASN N . n 
A 1 11 LEU 11 44  44  LEU LEU N . n 
A 1 12 LEU 12 45  45  LEU LEU N . n 
A 1 13 ARG 13 46  46  ARG ARG N . n 
A 1 14 ALA 14 47  47  ALA ALA N . n 
A 1 15 ILE 15 48  48  ILE ILE N . n 
A 1 16 GLU 16 49  49  GLU GLU N . n 
A 1 17 ALA 17 50  50  ALA ALA N . n 
A 1 18 GLN 18 51  51  GLN GLN N . n 
A 1 19 GLN 19 52  52  GLN GLN N . n 
A 1 20 HIS 20 53  53  HIS HIS N . n 
A 1 21 LEU 21 54  54  LEU LEU N . n 
A 1 22 LEU 22 55  55  LEU LEU N . n 
A 1 23 GLN 23 56  56  GLN GLN N . n 
A 1 24 LEU 24 57  57  LEU LEU N . n 
A 1 25 THR 25 58  58  THR THR N . n 
A 1 26 VAL 26 59  59  VAL VAL N . n 
A 1 27 TRP 27 60  60  TRP TRP N . n 
A 1 28 GLY 28 61  61  GLY GLY N . n 
A 1 29 ILE 29 62  62  ILE ILE N . n 
A 1 30 LYS 30 63  63  LYS LYS N . n 
A 1 31 GLN 31 64  64  GLN GLN N . n 
A 1 32 LEU 32 65  65  LEU LEU N . n 
A 1 33 GLN 33 66  66  GLN GLN N . n 
A 1 34 ALA 34 67  67  ALA ALA N . n 
A 1 35 ARG 35 68  68  ARG ARG N . n 
A 1 36 ILE 36 69  69  ILE ILE N . n 
A 1 37 LEU 37 70  70  LEU LEU N . n 
B 2 1  ACE 1  116 116 ACE ACE C . n 
B 2 2  TRP 2  117 117 TRP TRP C . n 
B 2 3  MET 3  118 118 MET MET C . n 
B 2 4  GLU 4  119 119 GLU GLU C . n 
B 2 5  TRP 5  120 120 TRP TRP C . n 
B 2 6  ASP 6  121 121 ASP ASP C . n 
B 2 7  ARG 7  122 122 ARG ARG C . n 
B 2 8  GLU 8  123 123 GLU GLU C . n 
B 2 9  ILE 9  124 124 ILE ILE C . n 
B 2 10 ASN 10 125 125 ASN ASN C . n 
B 2 11 ASN 11 126 126 ASN ASN C . n 
B 2 12 TYR 12 127 127 TYR TYR C . n 
B 2 13 THR 13 128 128 THR THR C . n 
B 2 14 SER 14 129 129 SER SER C . n 
B 2 15 LEU 15 130 130 LEU LEU C . n 
B 2 16 ILE 16 131 131 ILE ILE C . n 
B 2 17 HIS 17 132 132 HIS HIS C . n 
B 2 18 SER 18 133 133 SER SER C . n 
B 2 19 LEU 19 134 134 LEU LEU C . n 
B 2 20 ILE 20 135 135 ILE ILE C . n 
B 2 21 GLU 21 136 136 GLU GLU C . n 
B 2 22 GLU 22 137 137 GLU GLU C . n 
B 2 23 ALA 23 138 138 ALA ALA C . n 
B 2 24 GLN 24 139 139 GLN GLN C . n 
B 2 25 ASN 25 140 140 ASN ASN C . n 
B 2 26 GLN 26 141 141 GLN GLN C . n 
B 2 27 GLN 27 142 142 GLN GLN C . n 
B 2 28 GLU 28 143 143 GLU GLU C . n 
B 2 29 LYS 29 144 144 LYS LYS C . n 
B 2 30 ASN 30 145 145 ASN ASN C . n 
B 2 31 GLU 31 146 146 GLU GLU C . n 
B 2 32 GLN 32 147 147 GLN GLN C . n 
B 2 33 GLU 33 148 148 GLU GLU C . n 
B 2 34 LEU 34 149 149 LEU LEU C . n 
B 2 35 LEU 35 150 150 LEU LEU C . n 
# 
loop_
_pdbx_nonpoly_scheme.asym_id 
_pdbx_nonpoly_scheme.entity_id 
_pdbx_nonpoly_scheme.mon_id 
_pdbx_nonpoly_scheme.ndb_seq_num 
_pdbx_nonpoly_scheme.pdb_seq_num 
_pdbx_nonpoly_scheme.auth_seq_num 
_pdbx_nonpoly_scheme.pdb_mon_id 
_pdbx_nonpoly_scheme.auth_mon_id 
_pdbx_nonpoly_scheme.pdb_strand_id 
_pdbx_nonpoly_scheme.pdb_ins_code 
C 3 HOH 1  1  1  HOH HOH N . 
C 3 HOH 2  2  2  HOH HOH N . 
C 3 HOH 3  3  3  HOH HOH N . 
C 3 HOH 4  4  4  HOH HOH N . 
C 3 HOH 5  5  5  HOH HOH N . 
C 3 HOH 6  6  6  HOH HOH N . 
C 3 HOH 7  7  7  HOH HOH N . 
C 3 HOH 8  8  8  HOH HOH N . 
C 3 HOH 9  9  9  HOH HOH N . 
C 3 HOH 10 10 10 HOH HOH N . 
C 3 HOH 11 11 11 HOH HOH N . 
C 3 HOH 12 12 12 HOH HOH N . 
C 3 HOH 13 13 13 HOH HOH N . 
C 3 HOH 14 14 14 HOH HOH N . 
C 3 HOH 15 15 15 HOH HOH N . 
C 3 HOH 16 16 16 HOH HOH N . 
C 3 HOH 17 17 17 HOH HOH N . 
C 3 HOH 18 18 18 HOH HOH N . 
D 3 HOH 1  19 19 HOH HOH C . 
D 3 HOH 2  20 20 HOH HOH C . 
D 3 HOH 3  21 21 HOH HOH C . 
D 3 HOH 4  22 22 HOH HOH C . 
D 3 HOH 5  23 23 HOH HOH C . 
D 3 HOH 6  24 24 HOH HOH C . 
D 3 HOH 7  25 25 HOH HOH C . 
D 3 HOH 8  26 26 HOH HOH C . 
D 3 HOH 9  27 27 HOH HOH C . 
# 
loop_
_software.name 
_software.classification 
_software.version 
_software.citation_id 
_software.pdbx_ordinal 
MOLREP phasing          .        ? 1 
REFMAC refinement       5.2.0019 ? 2 
d*TREK 'data reduction' .        ? 3 
d*TREK 'data scaling'   .        ? 4 
# 
_cell.entry_id           2ZZO 
_cell.length_a           49.090 
_cell.length_b           49.090 
_cell.length_c           56.400 
_cell.angle_alpha        90.00 
_cell.angle_beta         90.00 
_cell.angle_gamma        120.00 
_cell.Z_PDB              6 
_cell.pdbx_unique_axis   ? 
_cell.length_a_esd       ? 
_cell.length_b_esd       ? 
_cell.length_c_esd       ? 
_cell.angle_alpha_esd    ? 
_cell.angle_beta_esd     ? 
_cell.angle_gamma_esd    ? 
# 
_symmetry.entry_id                         2ZZO 
_symmetry.space_group_name_H-M             'P 3 2 1' 
_symmetry.pdbx_full_space_group_name_H-M   ? 
_symmetry.cell_setting                     ? 
_symmetry.Int_Tables_number                150 
_symmetry.space_group_name_Hall            ? 
# 
_exptl.entry_id          2ZZO 
_exptl.method            'X-RAY DIFFRACTION' 
_exptl.crystals_number   1 
# 
_exptl_crystal.id                    1 
_exptl_crystal.density_meas          ? 
_exptl_crystal.density_Matthews      2.33 
_exptl_crystal.density_percent_sol   47.24 
_exptl_crystal.description           ? 
_exptl_crystal.F_000                 ? 
_exptl_crystal.preparation           ? 
# 
_exptl_crystal_grow.crystal_id      1 
_exptl_crystal_grow.method          ? 
_exptl_crystal_grow.temp            293 
_exptl_crystal_grow.temp_details    ? 
_exptl_crystal_grow.pH              4.00 
_exptl_crystal_grow.pdbx_pH_range   ? 
_exptl_crystal_grow.pdbx_details    
'100MM SODIUM ACETATE BUFFER, PH4.0, 400MM MAGNESIUM CHLORIDE, 12% ETHANOL, pH 4.00, VAPOR DIFFUSION, SITTING DROP, temperature 293K' 
# 
_diffrn.id                     1 
_diffrn.ambient_temp           113.0 
_diffrn.ambient_temp_details   ? 
_diffrn.crystal_id             1 
# 
_diffrn_detector.diffrn_id              1 
_diffrn_detector.detector               'IMAGE PLATE' 
_diffrn_detector.type                   'RIGAKU RAXIS VII' 
_diffrn_detector.pdbx_collection_date   2008-10-16 
_diffrn_detector.details                ? 
# 
_diffrn_radiation.diffrn_id                        1 
_diffrn_radiation.wavelength_id                    1 
_diffrn_radiation.pdbx_monochromatic_or_laue_m_l   M 
_diffrn_radiation.monochromator                    ? 
_diffrn_radiation.pdbx_diffrn_protocol             'SINGLE WAVELENGTH' 
_diffrn_radiation.pdbx_scattering_type             x-ray 
# 
_diffrn_radiation_wavelength.id           1 
_diffrn_radiation_wavelength.wavelength   1.5418 
_diffrn_radiation_wavelength.wt           1.0 
# 
_diffrn_source.diffrn_id                   1 
_diffrn_source.source                      'ROTATING ANODE' 
_diffrn_source.type                        RIGAKU 
_diffrn_source.pdbx_synchrotron_site       ? 
_diffrn_source.pdbx_synchrotron_beamline   ? 
_diffrn_source.pdbx_wavelength             1.5418 
_diffrn_source.pdbx_wavelength_list        ? 
# 
_reflns.entry_id                     2ZZO 
_reflns.observed_criterion_sigma_I   ? 
_reflns.observed_criterion_sigma_F   ? 
_reflns.d_resolution_low             33.950 
_reflns.d_resolution_high            2.200 
_reflns.number_obs                   4248 
_reflns.number_all                   ? 
_reflns.percent_possible_obs         99.7 
_reflns.pdbx_Rmerge_I_obs            0.06100 
_reflns.pdbx_Rsym_value              ? 
_reflns.pdbx_netI_over_sigmaI        19.1000 
_reflns.B_iso_Wilson_estimate        ? 
_reflns.pdbx_redundancy              10.1300 
_reflns.R_free_details               ? 
_reflns.limit_h_max                  ? 
_reflns.limit_h_min                  ? 
_reflns.limit_k_max                  ? 
_reflns.limit_k_min                  ? 
_reflns.limit_l_max                  ? 
_reflns.limit_l_min                  ? 
_reflns.observed_criterion_F_max     ? 
_reflns.observed_criterion_F_min     ? 
_reflns.pdbx_chi_squared             ? 
_reflns.pdbx_scaling_rejects         ? 
_reflns.pdbx_diffrn_id               1 
_reflns.pdbx_ordinal                 1 
# 
_reflns_shell.d_res_high             2.20 
_reflns_shell.d_res_low              2.28 
_reflns_shell.percent_possible_all   100.0 
_reflns_shell.Rmerge_I_obs           0.40600 
_reflns_shell.pdbx_Rsym_value        ? 
_reflns_shell.meanI_over_sigI_obs    4.300 
_reflns_shell.pdbx_redundancy        9.63 
_reflns_shell.percent_possible_obs   ? 
_reflns_shell.number_unique_all      ? 
_reflns_shell.number_measured_all    ? 
_reflns_shell.number_measured_obs    ? 
_reflns_shell.number_unique_obs      ? 
_reflns_shell.pdbx_chi_squared       ? 
_reflns_shell.pdbx_diffrn_id         ? 
_reflns_shell.pdbx_ordinal           1 
# 
_refine.pdbx_refine_id                           'X-RAY DIFFRACTION' 
_refine.entry_id                                 2ZZO 
_refine.ls_number_reflns_obs                     4037 
_refine.ls_number_reflns_all                     ? 
_refine.pdbx_ls_sigma_I                          ? 
_refine.pdbx_ls_sigma_F                          ? 
_refine.pdbx_data_cutoff_high_absF               ? 
_refine.pdbx_data_cutoff_low_absF                ? 
_refine.pdbx_data_cutoff_high_rms_absF           ? 
_refine.ls_d_res_low                             18.52 
_refine.ls_d_res_high                            2.20 
_refine.ls_percent_reflns_obs                    99.8 
_refine.ls_R_factor_obs                          0.215 
_refine.ls_R_factor_all                          ? 
_refine.ls_R_factor_R_work                       0.212 
_refine.ls_R_factor_R_free                       0.283 
_refine.ls_R_factor_R_free_error                 ? 
_refine.ls_R_factor_R_free_error_details         ? 
_refine.ls_percent_reflns_R_free                 4.600 
_refine.ls_number_reflns_R_free                  195 
_refine.ls_number_parameters                     ? 
_refine.ls_number_restraints                     ? 
_refine.occupancy_min                            ? 
_refine.occupancy_max                            ? 
_refine.correlation_coeff_Fo_to_Fc               0.954 
_refine.correlation_coeff_Fo_to_Fc_free          0.924 
_refine.B_iso_mean                               40.69 
_refine.aniso_B[1][1]                            0.00000 
_refine.aniso_B[2][2]                            0.00000 
_refine.aniso_B[3][3]                            0.01000 
_refine.aniso_B[1][2]                            0.00000 
_refine.aniso_B[1][3]                            0.00000 
_refine.aniso_B[2][3]                            0.00000 
_refine.solvent_model_details                    MASK 
_refine.solvent_model_param_ksol                 ? 
_refine.solvent_model_param_bsol                 ? 
_refine.pdbx_solvent_vdw_probe_radii             1.20 
_refine.pdbx_solvent_ion_probe_radii             0.80 
_refine.pdbx_solvent_shrinkage_radii             0.80 
_refine.pdbx_ls_cross_valid_method               THROUGHOUT 
_refine.details                                  'HYDROGENS HAVE BEEN ADDED IN THE RIDING POSITIONS' 
_refine.pdbx_starting_model                      'PDB ENTRY 1AIK' 
_refine.pdbx_method_to_determine_struct          'MOLECULAR REPLACEMENT' 
_refine.pdbx_isotropic_thermal_model             ? 
_refine.pdbx_stereochemistry_target_values       'MAXIMUM LIKELIHOOD' 
_refine.pdbx_stereochem_target_val_spec_case     ? 
_refine.pdbx_R_Free_selection_details            RANDOM 
_refine.pdbx_overall_ESU_R                       0.299 
_refine.pdbx_overall_ESU_R_Free                  0.248 
_refine.overall_SU_ML                            0.147 
_refine.pdbx_overall_phase_error                 ? 
_refine.overall_SU_B                             5.675 
_refine.ls_redundancy_reflns_obs                 ? 
_refine.B_iso_min                                ? 
_refine.B_iso_max                                ? 
_refine.overall_SU_R_Cruickshank_DPI             ? 
_refine.overall_SU_R_free                        ? 
_refine.ls_wR_factor_R_free                      ? 
_refine.ls_wR_factor_R_work                      ? 
_refine.overall_FOM_free_R_set                   ? 
_refine.overall_FOM_work_R_set                   ? 
_refine.pdbx_diffrn_id                           1 
_refine.pdbx_TLS_residual_ADP_flag               ? 
_refine.pdbx_overall_SU_R_free_Cruickshank_DPI   ? 
_refine.pdbx_overall_SU_R_Blow_DPI               ? 
_refine.pdbx_overall_SU_R_free_Blow_DPI          ? 
# 
_refine_hist.pdbx_refine_id                   'X-RAY DIFFRACTION' 
_refine_hist.cycle_id                         LAST 
_refine_hist.pdbx_number_atoms_protein        593 
_refine_hist.pdbx_number_atoms_nucleic_acid   0 
_refine_hist.pdbx_number_atoms_ligand         0 
_refine_hist.number_atoms_solvent             27 
_refine_hist.number_atoms_total               620 
_refine_hist.d_res_high                       2.20 
_refine_hist.d_res_low                        18.52 
# 
loop_
_refine_ls_restr.type 
_refine_ls_restr.dev_ideal 
_refine_ls_restr.dev_ideal_target 
_refine_ls_restr.weight 
_refine_ls_restr.number 
_refine_ls_restr.pdbx_refine_id 
_refine_ls_restr.pdbx_restraint_function 
r_bond_refined_d             0.026  0.021  ? 600 'X-RAY DIFFRACTION' ? 
r_bond_other_d               ?      ?      ? ?   'X-RAY DIFFRACTION' ? 
r_angle_refined_deg          2.060  1.933  ? 810 'X-RAY DIFFRACTION' ? 
r_angle_other_deg            ?      ?      ? ?   'X-RAY DIFFRACTION' ? 
r_dihedral_angle_1_deg       6.326  5.000  ? 68  'X-RAY DIFFRACTION' ? 
r_dihedral_angle_2_deg       31.860 26.667 ? 36  'X-RAY DIFFRACTION' ? 
r_dihedral_angle_3_deg       19.225 15.000 ? 116 'X-RAY DIFFRACTION' ? 
r_dihedral_angle_4_deg       30.046 15.000 ? 3   'X-RAY DIFFRACTION' ? 
r_chiral_restr               0.128  0.200  ? 90  'X-RAY DIFFRACTION' ? 
r_gen_planes_refined         0.009  0.020  ? 445 'X-RAY DIFFRACTION' ? 
r_gen_planes_other           ?      ?      ? ?   'X-RAY DIFFRACTION' ? 
r_nbd_refined                0.234  0.200  ? 240 'X-RAY DIFFRACTION' ? 
r_nbd_other                  ?      ?      ? ?   'X-RAY DIFFRACTION' ? 
r_nbtor_refined              0.313  0.200  ? 434 'X-RAY DIFFRACTION' ? 
r_nbtor_other                ?      ?      ? ?   'X-RAY DIFFRACTION' ? 
r_xyhbond_nbd_refined        0.149  0.200  ? 17  'X-RAY DIFFRACTION' ? 
r_xyhbond_nbd_other          ?      ?      ? ?   'X-RAY DIFFRACTION' ? 
r_metal_ion_refined          ?      ?      ? ?   'X-RAY DIFFRACTION' ? 
r_metal_ion_other            ?      ?      ? ?   'X-RAY DIFFRACTION' ? 
r_symmetry_vdw_refined       0.295  0.200  ? 54  'X-RAY DIFFRACTION' ? 
r_symmetry_vdw_other         ?      ?      ? ?   'X-RAY DIFFRACTION' ? 
r_symmetry_hbond_refined     0.261  0.200  ? 8   'X-RAY DIFFRACTION' ? 
r_symmetry_hbond_other       ?      ?      ? ?   'X-RAY DIFFRACTION' ? 
r_symmetry_metal_ion_refined ?      ?      ? ?   'X-RAY DIFFRACTION' ? 
r_symmetry_metal_ion_other   ?      ?      ? ?   'X-RAY DIFFRACTION' ? 
r_mcbond_it                  1.379  1.500  ? 363 'X-RAY DIFFRACTION' ? 
r_mcbond_other               ?      ?      ? ?   'X-RAY DIFFRACTION' ? 
r_mcangle_it                 2.243  2.000  ? 563 'X-RAY DIFFRACTION' ? 
r_scbond_it                  3.751  3.000  ? 273 'X-RAY DIFFRACTION' ? 
r_scangle_it                 6.062  4.500  ? 247 'X-RAY DIFFRACTION' ? 
r_rigid_bond_restr           ?      ?      ? ?   'X-RAY DIFFRACTION' ? 
r_sphericity_free            ?      ?      ? ?   'X-RAY DIFFRACTION' ? 
r_sphericity_bonded          ?      ?      ? ?   'X-RAY DIFFRACTION' ? 
# 
_refine_ls_shell.pdbx_refine_id                   'X-RAY DIFFRACTION' 
_refine_ls_shell.pdbx_total_number_of_bins_used   20 
_refine_ls_shell.d_res_high                       2.20 
_refine_ls_shell.d_res_low                        2.26 
_refine_ls_shell.number_reflns_R_work             292 
_refine_ls_shell.R_factor_R_work                  0.1850 
_refine_ls_shell.percent_reflns_obs               100.00 
_refine_ls_shell.R_factor_R_free                  0.3930 
_refine_ls_shell.R_factor_R_free_error            ? 
_refine_ls_shell.percent_reflns_R_free            ? 
_refine_ls_shell.number_reflns_R_free             12 
_refine_ls_shell.number_reflns_all                ? 
_refine_ls_shell.R_factor_all                     ? 
_refine_ls_shell.redundancy_reflns_obs            ? 
_refine_ls_shell.number_reflns_obs                ? 
# 
_database_PDB_matrix.entry_id          2ZZO 
_database_PDB_matrix.origx[1][1]       1.000000 
_database_PDB_matrix.origx[1][2]       0.000000 
_database_PDB_matrix.origx[1][3]       0.000000 
_database_PDB_matrix.origx[2][1]       0.000000 
_database_PDB_matrix.origx[2][2]       1.000000 
_database_PDB_matrix.origx[2][3]       0.000000 
_database_PDB_matrix.origx[3][1]       0.000000 
_database_PDB_matrix.origx[3][2]       0.000000 
_database_PDB_matrix.origx[3][3]       1.000000 
_database_PDB_matrix.origx_vector[1]   0.00000 
_database_PDB_matrix.origx_vector[2]   0.00000 
_database_PDB_matrix.origx_vector[3]   0.00000 
# 
_struct.entry_id                  2ZZO 
_struct.title                     'Crystal structure of the complex between GP41 fragment N36 and fusion inhibitor C34/S138A' 
_struct.pdbx_model_details        ? 
_struct.pdbx_CASP_flag            ? 
_struct.pdbx_model_type_details   ? 
# 
_struct_keywords.entry_id        2ZZO 
_struct_keywords.pdbx_keywords   'VIRAL PROTEIN/INHIBITOR' 
_struct_keywords.text            'HIV-1, GP41, VIRAL PROTEIN-INHIBITOR COMPLEX' 
# 
loop_
_struct_asym.id 
_struct_asym.pdbx_blank_PDB_chainid_flag 
_struct_asym.pdbx_modified 
_struct_asym.entity_id 
_struct_asym.details 
A N N 1 ? 
B N N 2 ? 
C N N 3 ? 
D N N 3 ? 
# 
loop_
_struct_ref.id 
_struct_ref.db_name 
_struct_ref.db_code 
_struct_ref.pdbx_db_accession 
_struct_ref.entity_id 
_struct_ref.pdbx_seq_one_letter_code 
_struct_ref.pdbx_align_begin 
_struct_ref.pdbx_db_isoform 
1 UNP ENV_HV1Z6 P04578 1 SGIVQQQNNLLRAIEAQQHLLQLTVWGIKQLQARIL 546 ? 
2 UNP ENV_HV1H2 P04578 2 WMEWDREINNYTSLIHSLIEESQNQQEKNEQELL   628 ? 
# 
loop_
_struct_ref_seq.align_id 
_struct_ref_seq.ref_id 
_struct_ref_seq.pdbx_PDB_id_code 
_struct_ref_seq.pdbx_strand_id 
_struct_ref_seq.seq_align_beg 
_struct_ref_seq.pdbx_seq_align_beg_ins_code 
_struct_ref_seq.seq_align_end 
_struct_ref_seq.pdbx_seq_align_end_ins_code 
_struct_ref_seq.pdbx_db_accession 
_struct_ref_seq.db_align_beg 
_struct_ref_seq.pdbx_db_align_beg_ins_code 
_struct_ref_seq.db_align_end 
_struct_ref_seq.pdbx_db_align_end_ins_code 
_struct_ref_seq.pdbx_auth_seq_align_beg 
_struct_ref_seq.pdbx_auth_seq_align_end 
1 1 2ZZO N 2 ? 37 ? P04580 546 ? 581 ? 35  70  
2 2 2ZZO C 2 ? 35 ? P04578 628 ? 661 ? 117 150 
# 
loop_
_struct_ref_seq_dif.align_id 
_struct_ref_seq_dif.pdbx_pdb_id_code 
_struct_ref_seq_dif.mon_id 
_struct_ref_seq_dif.pdbx_pdb_strand_id 
_struct_ref_seq_dif.seq_num 
_struct_ref_seq_dif.pdbx_pdb_ins_code 
_struct_ref_seq_dif.pdbx_seq_db_name 
_struct_ref_seq_dif.pdbx_seq_db_accession_code 
_struct_ref_seq_dif.db_mon_id 
_struct_ref_seq_dif.pdbx_seq_db_seq_num 
_struct_ref_seq_dif.details 
_struct_ref_seq_dif.pdbx_auth_seq_num 
_struct_ref_seq_dif.pdbx_ordinal 
1 2ZZO ACE N 1  ? UNP P04580 ?   ?   acetylation           34  1 
2 2ZZO ACE C 1  ? UNP P04578 ?   ?   acetylation           116 2 
2 2ZZO ALA C 23 ? UNP P04578 SER 649 'engineered mutation' 138 3 
# 
_pdbx_struct_assembly.id                   1 
_pdbx_struct_assembly.details              author_and_software_defined_assembly 
_pdbx_struct_assembly.method_details       PISA 
_pdbx_struct_assembly.oligomeric_details   hexameric 
_pdbx_struct_assembly.oligomeric_count     6 
# 
loop_
_pdbx_struct_assembly_prop.biol_id 
_pdbx_struct_assembly_prop.type 
_pdbx_struct_assembly_prop.value 
_pdbx_struct_assembly_prop.details 
1 'ABSA (A^2)' 11950 ? 
1 MORE         -101  ? 
1 'SSA (A^2)'  11080 ? 
# 
_pdbx_struct_assembly_gen.assembly_id       1 
_pdbx_struct_assembly_gen.oper_expression   1,2,3 
_pdbx_struct_assembly_gen.asym_id_list      A,B,C,D 
# 
loop_
_pdbx_struct_oper_list.id 
_pdbx_struct_oper_list.type 
_pdbx_struct_oper_list.name 
_pdbx_struct_oper_list.symmetry_operation 
_pdbx_struct_oper_list.matrix[1][1] 
_pdbx_struct_oper_list.matrix[1][2] 
_pdbx_struct_oper_list.matrix[1][3] 
_pdbx_struct_oper_list.vector[1] 
_pdbx_struct_oper_list.matrix[2][1] 
_pdbx_struct_oper_list.matrix[2][2] 
_pdbx_struct_oper_list.matrix[2][3] 
_pdbx_struct_oper_list.vector[2] 
_pdbx_struct_oper_list.matrix[3][1] 
_pdbx_struct_oper_list.matrix[3][2] 
_pdbx_struct_oper_list.matrix[3][3] 
_pdbx_struct_oper_list.vector[3] 
1 'identity operation'         1_555 x,y,z       1.0000000000  0.0000000000  0.0000000000 0.0000000000  0.0000000000  1.0000000000 
0.0000000000 0.0000000000   0.0000000000 0.0000000000 1.0000000000 0.0000000000 
2 'crystal symmetry operation' 2_545 -y,x-y-1,z  -0.5000000000 -0.8660254038 0.0000000000 24.5450000000 0.8660254038  
-0.5000000000 0.0000000000 -42.5131870718 0.0000000000 0.0000000000 1.0000000000 0.0000000000 
3 'crystal symmetry operation' 3_655 -x+y+1,-x,z -0.5000000000 0.8660254038  0.0000000000 49.0900000000 -0.8660254038 
-0.5000000000 0.0000000000 0.0000000000   0.0000000000 0.0000000000 1.0000000000 0.0000000000 
# 
_struct_biol.id        1 
_struct_biol.details   ? 
# 
loop_
_struct_conf.conf_type_id 
_struct_conf.id 
_struct_conf.pdbx_PDB_helix_id 
_struct_conf.beg_label_comp_id 
_struct_conf.beg_label_asym_id 
_struct_conf.beg_label_seq_id 
_struct_conf.pdbx_beg_PDB_ins_code 
_struct_conf.end_label_comp_id 
_struct_conf.end_label_asym_id 
_struct_conf.end_label_seq_id 
_struct_conf.pdbx_end_PDB_ins_code 
_struct_conf.beg_auth_comp_id 
_struct_conf.beg_auth_asym_id 
_struct_conf.beg_auth_seq_id 
_struct_conf.end_auth_comp_id 
_struct_conf.end_auth_asym_id 
_struct_conf.end_auth_seq_id 
_struct_conf.pdbx_PDB_helix_class 
_struct_conf.details 
_struct_conf.pdbx_PDB_helix_length 
HELX_P HELX_P1 1 SER A 2 ? LEU A 37 ? SER N 35  LEU N 70  1 ? 36 
HELX_P HELX_P2 2 TRP B 2 ? LEU B 34 ? TRP C 117 LEU C 149 1 ? 33 
# 
_struct_conf_type.id          HELX_P 
_struct_conf_type.criteria    ? 
_struct_conf_type.reference   ? 
# 
loop_
_struct_conn.id 
_struct_conn.conn_type_id 
_struct_conn.pdbx_leaving_atom_flag 
_struct_conn.pdbx_PDB_id 
_struct_conn.ptnr1_label_asym_id 
_struct_conn.ptnr1_label_comp_id 
_struct_conn.ptnr1_label_seq_id 
_struct_conn.ptnr1_label_atom_id 
_struct_conn.pdbx_ptnr1_label_alt_id 
_struct_conn.pdbx_ptnr1_PDB_ins_code 
_struct_conn.pdbx_ptnr1_standard_comp_id 
_struct_conn.ptnr1_symmetry 
_struct_conn.ptnr2_label_asym_id 
_struct_conn.ptnr2_label_comp_id 
_struct_conn.ptnr2_label_seq_id 
_struct_conn.ptnr2_label_atom_id 
_struct_conn.pdbx_ptnr2_label_alt_id 
_struct_conn.pdbx_ptnr2_PDB_ins_code 
_struct_conn.ptnr1_auth_asym_id 
_struct_conn.ptnr1_auth_comp_id 
_struct_conn.ptnr1_auth_seq_id 
_struct_conn.ptnr2_auth_asym_id 
_struct_conn.ptnr2_auth_comp_id 
_struct_conn.ptnr2_auth_seq_id 
_struct_conn.ptnr2_symmetry 
_struct_conn.pdbx_ptnr3_label_atom_id 
_struct_conn.pdbx_ptnr3_label_seq_id 
_struct_conn.pdbx_ptnr3_label_comp_id 
_struct_conn.pdbx_ptnr3_label_asym_id 
_struct_conn.pdbx_ptnr3_label_alt_id 
_struct_conn.pdbx_ptnr3_PDB_ins_code 
_struct_conn.details 
_struct_conn.pdbx_dist_value 
_struct_conn.pdbx_value_order 
_struct_conn.pdbx_role 
covale1 covale both ? A ACE 1 C ? ? ? 1_555 A SER 2 N ? ? N ACE 34  N SER 35  1_555 ? ? ? ? ? ? ? 1.316 ? ? 
covale2 covale both ? B ACE 1 C ? ? ? 1_555 B TRP 2 N ? ? C ACE 116 C TRP 117 1_555 ? ? ? ? ? ? ? 1.363 ? ? 
# 
_struct_conn_type.id          covale 
_struct_conn_type.criteria    ? 
_struct_conn_type.reference   ? 
# 
loop_
_pdbx_modification_feature.ordinal 
_pdbx_modification_feature.label_comp_id 
_pdbx_modification_feature.label_asym_id 
_pdbx_modification_feature.label_seq_id 
_pdbx_modification_feature.label_alt_id 
_pdbx_modification_feature.modified_residue_label_comp_id 
_pdbx_modification_feature.modified_residue_label_asym_id 
_pdbx_modification_feature.modified_residue_label_seq_id 
_pdbx_modification_feature.modified_residue_label_alt_id 
_pdbx_modification_feature.auth_comp_id 
_pdbx_modification_feature.auth_asym_id 
_pdbx_modification_feature.auth_seq_id 
_pdbx_modification_feature.PDB_ins_code 
_pdbx_modification_feature.symmetry 
_pdbx_modification_feature.modified_residue_auth_comp_id 
_pdbx_modification_feature.modified_residue_auth_asym_id 
_pdbx_modification_feature.modified_residue_auth_seq_id 
_pdbx_modification_feature.modified_residue_PDB_ins_code 
_pdbx_modification_feature.modified_residue_symmetry 
_pdbx_modification_feature.comp_id_linking_atom 
_pdbx_modification_feature.modified_residue_id_linking_atom 
_pdbx_modification_feature.modified_residue_id 
_pdbx_modification_feature.ref_pcm_id 
_pdbx_modification_feature.ref_comp_id 
_pdbx_modification_feature.type 
_pdbx_modification_feature.category 
1 ACE A 1 ? SER A 2 ? ACE N 34  ? 1_555 SER N 35  ? 1_555 . . SER 6  ACE None 'Terminal acetylation' 
2 ACE B 1 ? TRP B 2 ? ACE C 116 ? 1_555 TRP C 117 ? 1_555 . . TRP 16 ACE None 'Terminal acetylation' 
# 
_pdbx_entry_details.entry_id                   2ZZO 
_pdbx_entry_details.compound_details           ? 
_pdbx_entry_details.source_details             ? 
_pdbx_entry_details.nonpolymer_details         ? 
_pdbx_entry_details.sequence_details           ? 
_pdbx_entry_details.has_ligand_of_interest     ? 
_pdbx_entry_details.has_protein_modification   Y 
# 
loop_
_pdbx_struct_special_symmetry.id 
_pdbx_struct_special_symmetry.PDB_model_num 
_pdbx_struct_special_symmetry.auth_asym_id 
_pdbx_struct_special_symmetry.auth_comp_id 
_pdbx_struct_special_symmetry.auth_seq_id 
_pdbx_struct_special_symmetry.PDB_ins_code 
_pdbx_struct_special_symmetry.label_asym_id 
_pdbx_struct_special_symmetry.label_comp_id 
_pdbx_struct_special_symmetry.label_seq_id 
1 1 N HOH 3 ? C HOH . 
2 1 N HOH 7 ? C HOH . 
# 
loop_
_chem_comp_atom.comp_id 
_chem_comp_atom.atom_id 
_chem_comp_atom.type_symbol 
_chem_comp_atom.pdbx_aromatic_flag 
_chem_comp_atom.pdbx_stereo_config 
_chem_comp_atom.pdbx_ordinal 
ACE C    C N N 1   
ACE O    O N N 2   
ACE CH3  C N N 3   
ACE H    H N N 4   
ACE H1   H N N 5   
ACE H2   H N N 6   
ACE H3   H N N 7   
ALA N    N N N 8   
ALA CA   C N S 9   
ALA C    C N N 10  
ALA O    O N N 11  
ALA CB   C N N 12  
ALA OXT  O N N 13  
ALA H    H N N 14  
ALA H2   H N N 15  
ALA HA   H N N 16  
ALA HB1  H N N 17  
ALA HB2  H N N 18  
ALA HB3  H N N 19  
ALA HXT  H N N 20  
ARG N    N N N 21  
ARG CA   C N S 22  
ARG C    C N N 23  
ARG O    O N N 24  
ARG CB   C N N 25  
ARG CG   C N N 26  
ARG CD   C N N 27  
ARG NE   N N N 28  
ARG CZ   C N N 29  
ARG NH1  N N N 30  
ARG NH2  N N N 31  
ARG OXT  O N N 32  
ARG H    H N N 33  
ARG H2   H N N 34  
ARG HA   H N N 35  
ARG HB2  H N N 36  
ARG HB3  H N N 37  
ARG HG2  H N N 38  
ARG HG3  H N N 39  
ARG HD2  H N N 40  
ARG HD3  H N N 41  
ARG HE   H N N 42  
ARG HH11 H N N 43  
ARG HH12 H N N 44  
ARG HH21 H N N 45  
ARG HH22 H N N 46  
ARG HXT  H N N 47  
ASN N    N N N 48  
ASN CA   C N S 49  
ASN C    C N N 50  
ASN O    O N N 51  
ASN CB   C N N 52  
ASN CG   C N N 53  
ASN OD1  O N N 54  
ASN ND2  N N N 55  
ASN OXT  O N N 56  
ASN H    H N N 57  
ASN H2   H N N 58  
ASN HA   H N N 59  
ASN HB2  H N N 60  
ASN HB3  H N N 61  
ASN HD21 H N N 62  
ASN HD22 H N N 63  
ASN HXT  H N N 64  
ASP N    N N N 65  
ASP CA   C N S 66  
ASP C    C N N 67  
ASP O    O N N 68  
ASP CB   C N N 69  
ASP CG   C N N 70  
ASP OD1  O N N 71  
ASP OD2  O N N 72  
ASP OXT  O N N 73  
ASP H    H N N 74  
ASP H2   H N N 75  
ASP HA   H N N 76  
ASP HB2  H N N 77  
ASP HB3  H N N 78  
ASP HD2  H N N 79  
ASP HXT  H N N 80  
GLN N    N N N 81  
GLN CA   C N S 82  
GLN C    C N N 83  
GLN O    O N N 84  
GLN CB   C N N 85  
GLN CG   C N N 86  
GLN CD   C N N 87  
GLN OE1  O N N 88  
GLN NE2  N N N 89  
GLN OXT  O N N 90  
GLN H    H N N 91  
GLN H2   H N N 92  
GLN HA   H N N 93  
GLN HB2  H N N 94  
GLN HB3  H N N 95  
GLN HG2  H N N 96  
GLN HG3  H N N 97  
GLN HE21 H N N 98  
GLN HE22 H N N 99  
GLN HXT  H N N 100 
GLU N    N N N 101 
GLU CA   C N S 102 
GLU C    C N N 103 
GLU O    O N N 104 
GLU CB   C N N 105 
GLU CG   C N N 106 
GLU CD   C N N 107 
GLU OE1  O N N 108 
GLU OE2  O N N 109 
GLU OXT  O N N 110 
GLU H    H N N 111 
GLU H2   H N N 112 
GLU HA   H N N 113 
GLU HB2  H N N 114 
GLU HB3  H N N 115 
GLU HG2  H N N 116 
GLU HG3  H N N 117 
GLU HE2  H N N 118 
GLU HXT  H N N 119 
GLY N    N N N 120 
GLY CA   C N N 121 
GLY C    C N N 122 
GLY O    O N N 123 
GLY OXT  O N N 124 
GLY H    H N N 125 
GLY H2   H N N 126 
GLY HA2  H N N 127 
GLY HA3  H N N 128 
GLY HXT  H N N 129 
HIS N    N N N 130 
HIS CA   C N S 131 
HIS C    C N N 132 
HIS O    O N N 133 
HIS CB   C N N 134 
HIS CG   C Y N 135 
HIS ND1  N Y N 136 
HIS CD2  C Y N 137 
HIS CE1  C Y N 138 
HIS NE2  N Y N 139 
HIS OXT  O N N 140 
HIS H    H N N 141 
HIS H2   H N N 142 
HIS HA   H N N 143 
HIS HB2  H N N 144 
HIS HB3  H N N 145 
HIS HD1  H N N 146 
HIS HD2  H N N 147 
HIS HE1  H N N 148 
HIS HE2  H N N 149 
HIS HXT  H N N 150 
HOH O    O N N 151 
HOH H1   H N N 152 
HOH H2   H N N 153 
ILE N    N N N 154 
ILE CA   C N S 155 
ILE C    C N N 156 
ILE O    O N N 157 
ILE CB   C N S 158 
ILE CG1  C N N 159 
ILE CG2  C N N 160 
ILE CD1  C N N 161 
ILE OXT  O N N 162 
ILE H    H N N 163 
ILE H2   H N N 164 
ILE HA   H N N 165 
ILE HB   H N N 166 
ILE HG12 H N N 167 
ILE HG13 H N N 168 
ILE HG21 H N N 169 
ILE HG22 H N N 170 
ILE HG23 H N N 171 
ILE HD11 H N N 172 
ILE HD12 H N N 173 
ILE HD13 H N N 174 
ILE HXT  H N N 175 
LEU N    N N N 176 
LEU CA   C N S 177 
LEU C    C N N 178 
LEU O    O N N 179 
LEU CB   C N N 180 
LEU CG   C N N 181 
LEU CD1  C N N 182 
LEU CD2  C N N 183 
LEU OXT  O N N 184 
LEU H    H N N 185 
LEU H2   H N N 186 
LEU HA   H N N 187 
LEU HB2  H N N 188 
LEU HB3  H N N 189 
LEU HG   H N N 190 
LEU HD11 H N N 191 
LEU HD12 H N N 192 
LEU HD13 H N N 193 
LEU HD21 H N N 194 
LEU HD22 H N N 195 
LEU HD23 H N N 196 
LEU HXT  H N N 197 
LYS N    N N N 198 
LYS CA   C N S 199 
LYS C    C N N 200 
LYS O    O N N 201 
LYS CB   C N N 202 
LYS CG   C N N 203 
LYS CD   C N N 204 
LYS CE   C N N 205 
LYS NZ   N N N 206 
LYS OXT  O N N 207 
LYS H    H N N 208 
LYS H2   H N N 209 
LYS HA   H N N 210 
LYS HB2  H N N 211 
LYS HB3  H N N 212 
LYS HG2  H N N 213 
LYS HG3  H N N 214 
LYS HD2  H N N 215 
LYS HD3  H N N 216 
LYS HE2  H N N 217 
LYS HE3  H N N 218 
LYS HZ1  H N N 219 
LYS HZ2  H N N 220 
LYS HZ3  H N N 221 
LYS HXT  H N N 222 
MET N    N N N 223 
MET CA   C N S 224 
MET C    C N N 225 
MET O    O N N 226 
MET CB   C N N 227 
MET CG   C N N 228 
MET SD   S N N 229 
MET CE   C N N 230 
MET OXT  O N N 231 
MET H    H N N 232 
MET H2   H N N 233 
MET HA   H N N 234 
MET HB2  H N N 235 
MET HB3  H N N 236 
MET HG2  H N N 237 
MET HG3  H N N 238 
MET HE1  H N N 239 
MET HE2  H N N 240 
MET HE3  H N N 241 
MET HXT  H N N 242 
SER N    N N N 243 
SER CA   C N S 244 
SER C    C N N 245 
SER O    O N N 246 
SER CB   C N N 247 
SER OG   O N N 248 
SER OXT  O N N 249 
SER H    H N N 250 
SER H2   H N N 251 
SER HA   H N N 252 
SER HB2  H N N 253 
SER HB3  H N N 254 
SER HG   H N N 255 
SER HXT  H N N 256 
THR N    N N N 257 
THR CA   C N S 258 
THR C    C N N 259 
THR O    O N N 260 
THR CB   C N R 261 
THR OG1  O N N 262 
THR CG2  C N N 263 
THR OXT  O N N 264 
THR H    H N N 265 
THR H2   H N N 266 
THR HA   H N N 267 
THR HB   H N N 268 
THR HG1  H N N 269 
THR HG21 H N N 270 
THR HG22 H N N 271 
THR HG23 H N N 272 
THR HXT  H N N 273 
TRP N    N N N 274 
TRP CA   C N S 275 
TRP C    C N N 276 
TRP O    O N N 277 
TRP CB   C N N 278 
TRP CG   C Y N 279 
TRP CD1  C Y N 280 
TRP CD2  C Y N 281 
TRP NE1  N Y N 282 
TRP CE2  C Y N 283 
TRP CE3  C Y N 284 
TRP CZ2  C Y N 285 
TRP CZ3  C Y N 286 
TRP CH2  C Y N 287 
TRP OXT  O N N 288 
TRP H    H N N 289 
TRP H2   H N N 290 
TRP HA   H N N 291 
TRP HB2  H N N 292 
TRP HB3  H N N 293 
TRP HD1  H N N 294 
TRP HE1  H N N 295 
TRP HE3  H N N 296 
TRP HZ2  H N N 297 
TRP HZ3  H N N 298 
TRP HH2  H N N 299 
TRP HXT  H N N 300 
TYR N    N N N 301 
TYR CA   C N S 302 
TYR C    C N N 303 
TYR O    O N N 304 
TYR CB   C N N 305 
TYR CG   C Y N 306 
TYR CD1  C Y N 307 
TYR CD2  C Y N 308 
TYR CE1  C Y N 309 
TYR CE2  C Y N 310 
TYR CZ   C Y N 311 
TYR OH   O N N 312 
TYR OXT  O N N 313 
TYR H    H N N 314 
TYR H2   H N N 315 
TYR HA   H N N 316 
TYR HB2  H N N 317 
TYR HB3  H N N 318 
TYR HD1  H N N 319 
TYR HD2  H N N 320 
TYR HE1  H N N 321 
TYR HE2  H N N 322 
TYR HH   H N N 323 
TYR HXT  H N N 324 
VAL N    N N N 325 
VAL CA   C N S 326 
VAL C    C N N 327 
VAL O    O N N 328 
VAL CB   C N N 329 
VAL CG1  C N N 330 
VAL CG2  C N N 331 
VAL OXT  O N N 332 
VAL H    H N N 333 
VAL H2   H N N 334 
VAL HA   H N N 335 
VAL HB   H N N 336 
VAL HG11 H N N 337 
VAL HG12 H N N 338 
VAL HG13 H N N 339 
VAL HG21 H N N 340 
VAL HG22 H N N 341 
VAL HG23 H N N 342 
VAL HXT  H N N 343 
# 
loop_
_chem_comp_bond.comp_id 
_chem_comp_bond.atom_id_1 
_chem_comp_bond.atom_id_2 
_chem_comp_bond.value_order 
_chem_comp_bond.pdbx_aromatic_flag 
_chem_comp_bond.pdbx_stereo_config 
_chem_comp_bond.pdbx_ordinal 
ACE C   O    doub N N 1   
ACE C   CH3  sing N N 2   
ACE C   H    sing N N 3   
ACE CH3 H1   sing N N 4   
ACE CH3 H2   sing N N 5   
ACE CH3 H3   sing N N 6   
ALA N   CA   sing N N 7   
ALA N   H    sing N N 8   
ALA N   H2   sing N N 9   
ALA CA  C    sing N N 10  
ALA CA  CB   sing N N 11  
ALA CA  HA   sing N N 12  
ALA C   O    doub N N 13  
ALA C   OXT  sing N N 14  
ALA CB  HB1  sing N N 15  
ALA CB  HB2  sing N N 16  
ALA CB  HB3  sing N N 17  
ALA OXT HXT  sing N N 18  
ARG N   CA   sing N N 19  
ARG N   H    sing N N 20  
ARG N   H2   sing N N 21  
ARG CA  C    sing N N 22  
ARG CA  CB   sing N N 23  
ARG CA  HA   sing N N 24  
ARG C   O    doub N N 25  
ARG C   OXT  sing N N 26  
ARG CB  CG   sing N N 27  
ARG CB  HB2  sing N N 28  
ARG CB  HB3  sing N N 29  
ARG CG  CD   sing N N 30  
ARG CG  HG2  sing N N 31  
ARG CG  HG3  sing N N 32  
ARG CD  NE   sing N N 33  
ARG CD  HD2  sing N N 34  
ARG CD  HD3  sing N N 35  
ARG NE  CZ   sing N N 36  
ARG NE  HE   sing N N 37  
ARG CZ  NH1  sing N N 38  
ARG CZ  NH2  doub N N 39  
ARG NH1 HH11 sing N N 40  
ARG NH1 HH12 sing N N 41  
ARG NH2 HH21 sing N N 42  
ARG NH2 HH22 sing N N 43  
ARG OXT HXT  sing N N 44  
ASN N   CA   sing N N 45  
ASN N   H    sing N N 46  
ASN N   H2   sing N N 47  
ASN CA  C    sing N N 48  
ASN CA  CB   sing N N 49  
ASN CA  HA   sing N N 50  
ASN C   O    doub N N 51  
ASN C   OXT  sing N N 52  
ASN CB  CG   sing N N 53  
ASN CB  HB2  sing N N 54  
ASN CB  HB3  sing N N 55  
ASN CG  OD1  doub N N 56  
ASN CG  ND2  sing N N 57  
ASN ND2 HD21 sing N N 58  
ASN ND2 HD22 sing N N 59  
ASN OXT HXT  sing N N 60  
ASP N   CA   sing N N 61  
ASP N   H    sing N N 62  
ASP N   H2   sing N N 63  
ASP CA  C    sing N N 64  
ASP CA  CB   sing N N 65  
ASP CA  HA   sing N N 66  
ASP C   O    doub N N 67  
ASP C   OXT  sing N N 68  
ASP CB  CG   sing N N 69  
ASP CB  HB2  sing N N 70  
ASP CB  HB3  sing N N 71  
ASP CG  OD1  doub N N 72  
ASP CG  OD2  sing N N 73  
ASP OD2 HD2  sing N N 74  
ASP OXT HXT  sing N N 75  
GLN N   CA   sing N N 76  
GLN N   H    sing N N 77  
GLN N   H2   sing N N 78  
GLN CA  C    sing N N 79  
GLN CA  CB   sing N N 80  
GLN CA  HA   sing N N 81  
GLN C   O    doub N N 82  
GLN C   OXT  sing N N 83  
GLN CB  CG   sing N N 84  
GLN CB  HB2  sing N N 85  
GLN CB  HB3  sing N N 86  
GLN CG  CD   sing N N 87  
GLN CG  HG2  sing N N 88  
GLN CG  HG3  sing N N 89  
GLN CD  OE1  doub N N 90  
GLN CD  NE2  sing N N 91  
GLN NE2 HE21 sing N N 92  
GLN NE2 HE22 sing N N 93  
GLN OXT HXT  sing N N 94  
GLU N   CA   sing N N 95  
GLU N   H    sing N N 96  
GLU N   H2   sing N N 97  
GLU CA  C    sing N N 98  
GLU CA  CB   sing N N 99  
GLU CA  HA   sing N N 100 
GLU C   O    doub N N 101 
GLU C   OXT  sing N N 102 
GLU CB  CG   sing N N 103 
GLU CB  HB2  sing N N 104 
GLU CB  HB3  sing N N 105 
GLU CG  CD   sing N N 106 
GLU CG  HG2  sing N N 107 
GLU CG  HG3  sing N N 108 
GLU CD  OE1  doub N N 109 
GLU CD  OE2  sing N N 110 
GLU OE2 HE2  sing N N 111 
GLU OXT HXT  sing N N 112 
GLY N   CA   sing N N 113 
GLY N   H    sing N N 114 
GLY N   H2   sing N N 115 
GLY CA  C    sing N N 116 
GLY CA  HA2  sing N N 117 
GLY CA  HA3  sing N N 118 
GLY C   O    doub N N 119 
GLY C   OXT  sing N N 120 
GLY OXT HXT  sing N N 121 
HIS N   CA   sing N N 122 
HIS N   H    sing N N 123 
HIS N   H2   sing N N 124 
HIS CA  C    sing N N 125 
HIS CA  CB   sing N N 126 
HIS CA  HA   sing N N 127 
HIS C   O    doub N N 128 
HIS C   OXT  sing N N 129 
HIS CB  CG   sing N N 130 
HIS CB  HB2  sing N N 131 
HIS CB  HB3  sing N N 132 
HIS CG  ND1  sing Y N 133 
HIS CG  CD2  doub Y N 134 
HIS ND1 CE1  doub Y N 135 
HIS ND1 HD1  sing N N 136 
HIS CD2 NE2  sing Y N 137 
HIS CD2 HD2  sing N N 138 
HIS CE1 NE2  sing Y N 139 
HIS CE1 HE1  sing N N 140 
HIS NE2 HE2  sing N N 141 
HIS OXT HXT  sing N N 142 
HOH O   H1   sing N N 143 
HOH O   H2   sing N N 144 
ILE N   CA   sing N N 145 
ILE N   H    sing N N 146 
ILE N   H2   sing N N 147 
ILE CA  C    sing N N 148 
ILE CA  CB   sing N N 149 
ILE CA  HA   sing N N 150 
ILE C   O    doub N N 151 
ILE C   OXT  sing N N 152 
ILE CB  CG1  sing N N 153 
ILE CB  CG2  sing N N 154 
ILE CB  HB   sing N N 155 
ILE CG1 CD1  sing N N 156 
ILE CG1 HG12 sing N N 157 
ILE CG1 HG13 sing N N 158 
ILE CG2 HG21 sing N N 159 
ILE CG2 HG22 sing N N 160 
ILE CG2 HG23 sing N N 161 
ILE CD1 HD11 sing N N 162 
ILE CD1 HD12 sing N N 163 
ILE CD1 HD13 sing N N 164 
ILE OXT HXT  sing N N 165 
LEU N   CA   sing N N 166 
LEU N   H    sing N N 167 
LEU N   H2   sing N N 168 
LEU CA  C    sing N N 169 
LEU CA  CB   sing N N 170 
LEU CA  HA   sing N N 171 
LEU C   O    doub N N 172 
LEU C   OXT  sing N N 173 
LEU CB  CG   sing N N 174 
LEU CB  HB2  sing N N 175 
LEU CB  HB3  sing N N 176 
LEU CG  CD1  sing N N 177 
LEU CG  CD2  sing N N 178 
LEU CG  HG   sing N N 179 
LEU CD1 HD11 sing N N 180 
LEU CD1 HD12 sing N N 181 
LEU CD1 HD13 sing N N 182 
LEU CD2 HD21 sing N N 183 
LEU CD2 HD22 sing N N 184 
LEU CD2 HD23 sing N N 185 
LEU OXT HXT  sing N N 186 
LYS N   CA   sing N N 187 
LYS N   H    sing N N 188 
LYS N   H2   sing N N 189 
LYS CA  C    sing N N 190 
LYS CA  CB   sing N N 191 
LYS CA  HA   sing N N 192 
LYS C   O    doub N N 193 
LYS C   OXT  sing N N 194 
LYS CB  CG   sing N N 195 
LYS CB  HB2  sing N N 196 
LYS CB  HB3  sing N N 197 
LYS CG  CD   sing N N 198 
LYS CG  HG2  sing N N 199 
LYS CG  HG3  sing N N 200 
LYS CD  CE   sing N N 201 
LYS CD  HD2  sing N N 202 
LYS CD  HD3  sing N N 203 
LYS CE  NZ   sing N N 204 
LYS CE  HE2  sing N N 205 
LYS CE  HE3  sing N N 206 
LYS NZ  HZ1  sing N N 207 
LYS NZ  HZ2  sing N N 208 
LYS NZ  HZ3  sing N N 209 
LYS OXT HXT  sing N N 210 
MET N   CA   sing N N 211 
MET N   H    sing N N 212 
MET N   H2   sing N N 213 
MET CA  C    sing N N 214 
MET CA  CB   sing N N 215 
MET CA  HA   sing N N 216 
MET C   O    doub N N 217 
MET C   OXT  sing N N 218 
MET CB  CG   sing N N 219 
MET CB  HB2  sing N N 220 
MET CB  HB3  sing N N 221 
MET CG  SD   sing N N 222 
MET CG  HG2  sing N N 223 
MET CG  HG3  sing N N 224 
MET SD  CE   sing N N 225 
MET CE  HE1  sing N N 226 
MET CE  HE2  sing N N 227 
MET CE  HE3  sing N N 228 
MET OXT HXT  sing N N 229 
SER N   CA   sing N N 230 
SER N   H    sing N N 231 
SER N   H2   sing N N 232 
SER CA  C    sing N N 233 
SER CA  CB   sing N N 234 
SER CA  HA   sing N N 235 
SER C   O    doub N N 236 
SER C   OXT  sing N N 237 
SER CB  OG   sing N N 238 
SER CB  HB2  sing N N 239 
SER CB  HB3  sing N N 240 
SER OG  HG   sing N N 241 
SER OXT HXT  sing N N 242 
THR N   CA   sing N N 243 
THR N   H    sing N N 244 
THR N   H2   sing N N 245 
THR CA  C    sing N N 246 
THR CA  CB   sing N N 247 
THR CA  HA   sing N N 248 
THR C   O    doub N N 249 
THR C   OXT  sing N N 250 
THR CB  OG1  sing N N 251 
THR CB  CG2  sing N N 252 
THR CB  HB   sing N N 253 
THR OG1 HG1  sing N N 254 
THR CG2 HG21 sing N N 255 
THR CG2 HG22 sing N N 256 
THR CG2 HG23 sing N N 257 
THR OXT HXT  sing N N 258 
TRP N   CA   sing N N 259 
TRP N   H    sing N N 260 
TRP N   H2   sing N N 261 
TRP CA  C    sing N N 262 
TRP CA  CB   sing N N 263 
TRP CA  HA   sing N N 264 
TRP C   O    doub N N 265 
TRP C   OXT  sing N N 266 
TRP CB  CG   sing N N 267 
TRP CB  HB2  sing N N 268 
TRP CB  HB3  sing N N 269 
TRP CG  CD1  doub Y N 270 
TRP CG  CD2  sing Y N 271 
TRP CD1 NE1  sing Y N 272 
TRP CD1 HD1  sing N N 273 
TRP CD2 CE2  doub Y N 274 
TRP CD2 CE3  sing Y N 275 
TRP NE1 CE2  sing Y N 276 
TRP NE1 HE1  sing N N 277 
TRP CE2 CZ2  sing Y N 278 
TRP CE3 CZ3  doub Y N 279 
TRP CE3 HE3  sing N N 280 
TRP CZ2 CH2  doub Y N 281 
TRP CZ2 HZ2  sing N N 282 
TRP CZ3 CH2  sing Y N 283 
TRP CZ3 HZ3  sing N N 284 
TRP CH2 HH2  sing N N 285 
TRP OXT HXT  sing N N 286 
TYR N   CA   sing N N 287 
TYR N   H    sing N N 288 
TYR N   H2   sing N N 289 
TYR CA  C    sing N N 290 
TYR CA  CB   sing N N 291 
TYR CA  HA   sing N N 292 
TYR C   O    doub N N 293 
TYR C   OXT  sing N N 294 
TYR CB  CG   sing N N 295 
TYR CB  HB2  sing N N 296 
TYR CB  HB3  sing N N 297 
TYR CG  CD1  doub Y N 298 
TYR CG  CD2  sing Y N 299 
TYR CD1 CE1  sing Y N 300 
TYR CD1 HD1  sing N N 301 
TYR CD2 CE2  doub Y N 302 
TYR CD2 HD2  sing N N 303 
TYR CE1 CZ   doub Y N 304 
TYR CE1 HE1  sing N N 305 
TYR CE2 CZ   sing Y N 306 
TYR CE2 HE2  sing N N 307 
TYR CZ  OH   sing N N 308 
TYR OH  HH   sing N N 309 
TYR OXT HXT  sing N N 310 
VAL N   CA   sing N N 311 
VAL N   H    sing N N 312 
VAL N   H2   sing N N 313 
VAL CA  C    sing N N 314 
VAL CA  CB   sing N N 315 
VAL CA  HA   sing N N 316 
VAL C   O    doub N N 317 
VAL C   OXT  sing N N 318 
VAL CB  CG1  sing N N 319 
VAL CB  CG2  sing N N 320 
VAL CB  HB   sing N N 321 
VAL CG1 HG11 sing N N 322 
VAL CG1 HG12 sing N N 323 
VAL CG1 HG13 sing N N 324 
VAL CG2 HG21 sing N N 325 
VAL CG2 HG22 sing N N 326 
VAL CG2 HG23 sing N N 327 
VAL OXT HXT  sing N N 328 
# 
_pdbx_initial_refinement_model.id               1 
_pdbx_initial_refinement_model.entity_id_list   ? 
_pdbx_initial_refinement_model.type             'experimental model' 
_pdbx_initial_refinement_model.source_name      PDB 
_pdbx_initial_refinement_model.accession_code   1AIK 
_pdbx_initial_refinement_model.details          'PDB ENTRY 1AIK' 
# 
_atom_sites.entry_id                    2ZZO 
_atom_sites.fract_transf_matrix[1][1]   0.020371 
_atom_sites.fract_transf_matrix[1][2]   0.011761 
_atom_sites.fract_transf_matrix[1][3]   0.000000 
_atom_sites.fract_transf_matrix[2][1]   0.000000 
_atom_sites.fract_transf_matrix[2][2]   0.023522 
_atom_sites.fract_transf_matrix[2][3]   0.000000 
_atom_sites.fract_transf_matrix[3][1]   0.000000 
_atom_sites.fract_transf_matrix[3][2]   0.000000 
_atom_sites.fract_transf_matrix[3][3]   0.017730 
_atom_sites.fract_transf_vector[1]      0.00000 
_atom_sites.fract_transf_vector[2]      0.00000 
_atom_sites.fract_transf_vector[3]      0.00000 
# 
loop_
_atom_type.symbol 
C 
N 
O 
S 
# 
loop_