data_2M37
# 
_entry.id   2M37 
# 
_audit_conform.dict_name       mmcif_pdbx.dic 
_audit_conform.dict_version    5.398 
_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   2M37         pdb_00002m37 10.2210/pdb2m37/pdb 
RCSB  RCSB103151   ?            ?                   
BMRB  18948        ?            10.13018/BMR18948   
WWPDB D_1000103151 ?            ?                   
# 
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 2013-05-01 
2 'Structure model' 1 1 2024-11-06 
# 
_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' 'Data collection'      
2 2 'Structure model' 'Database references'  
3 2 'Structure model' 'Derived calculations' 
4 2 '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 2 'Structure model' chem_comp_atom            
2 2 'Structure model' chem_comp_bond            
3 2 'Structure model' database_2                
4 2 'Structure model' pdbx_entry_details        
5 2 'Structure model' pdbx_modification_feature 
6 2 'Structure model' pdbx_nmr_spectrometer     
7 2 'Structure model' struct_conn               
# 
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 2 'Structure model' '_database_2.pdbx_DOI'                
2 2 'Structure model' '_database_2.pdbx_database_accession' 
3 2 'Structure model' '_pdbx_nmr_spectrometer.model'        
4 2 'Structure model' '_struct_conn.pdbx_leaving_atom_flag' 
# 
_pdbx_database_status.deposit_site                    BMRB 
_pdbx_database_status.entry_id                        2M37 
_pdbx_database_status.process_site                    RCSB 
_pdbx_database_status.recvd_initial_deposition_date   2013-01-14 
_pdbx_database_status.SG_entry                        ? 
_pdbx_database_status.status_code                     REL 
_pdbx_database_status.status_code_mr                  REL 
_pdbx_database_status.status_code_sf                  ? 
_pdbx_database_status.status_code_cs                  REL 
_pdbx_database_status.methods_development_category    ? 
_pdbx_database_status.pdb_format_compatible           Y 
_pdbx_database_status.status_code_nmr_data            ? 
# 
_pdbx_database_related.db_id          18948 
_pdbx_database_related.db_name        BMRB 
_pdbx_database_related.content_type   unspecified 
_pdbx_database_related.details        . 
# 
loop_
_audit_author.name 
_audit_author.pdbx_ordinal 
'Zimmermann, M.' 1 
'Hegemann, J.D.' 2 
'Xie, X.'        3 
'Marahiel, M.A.' 4 
# 
_citation.id                        primary 
_citation.title                     'The astexin-1 lasso peptides: biosynthesis, stability, and structural studies.' 
_citation.journal_abbrev            Chem.Biol. 
_citation.journal_volume            20 
_citation.page_first                558 
_citation.page_last                 569 
_citation.year                      2013 
_citation.journal_id_ASTM           CBOLE2 
_citation.country                   UK 
_citation.journal_id_ISSN           1074-5521 
_citation.journal_id_CSD            2050 
_citation.book_publisher            ? 
_citation.pdbx_database_id_PubMed   23601645 
_citation.pdbx_database_id_DOI      10.1016/j.chembiol.2013.03.013 
# 
loop_
_citation_author.citation_id 
_citation_author.name 
_citation_author.ordinal 
_citation_author.identifier_ORCID 
primary 'Zimmermann, M.' 1 ? 
primary 'Hegemann, J.D.' 2 ? 
primary 'Xie, X.'        3 ? 
primary 'Marahiel, M.A.' 4 ? 
# 
_entity.id                         1 
_entity.type                       polymer 
_entity.src_method                 man 
_entity.pdbx_description           ASTEXIN-1 
_entity.formula_weight             2113.219 
_entity.pdbx_number_of_molecules   1 
_entity.pdbx_ec                    ? 
_entity.pdbx_mutation              ? 
_entity.pdbx_fragment              ? 
_entity.details                    ? 
# 
_entity_poly.entity_id                      1 
_entity_poly.type                           'polypeptide(L)' 
_entity_poly.nstd_linkage                   no 
_entity_poly.nstd_monomer                   no 
_entity_poly.pdbx_seq_one_letter_code       GLSQGVEPDIGQTYFEESR 
_entity_poly.pdbx_seq_one_letter_code_can   GLSQGVEPDIGQTYFEESR 
_entity_poly.pdbx_strand_id                 A 
_entity_poly.pdbx_target_identifier         ? 
# 
loop_
_entity_poly_seq.entity_id 
_entity_poly_seq.num 
_entity_poly_seq.mon_id 
_entity_poly_seq.hetero 
1 1  GLY n 
1 2  LEU n 
1 3  SER n 
1 4  GLN n 
1 5  GLY n 
1 6  VAL n 
1 7  GLU n 
1 8  PRO n 
1 9  ASP n 
1 10 ILE n 
1 11 GLY n 
1 12 GLN n 
1 13 THR n 
1 14 TYR n 
1 15 PHE n 
1 16 GLU n 
1 17 GLU n 
1 18 SER n 
1 19 ARG n 
# 
_entity_src_gen.entity_id                          1 
_entity_src_gen.pdbx_src_id                        1 
_entity_src_gen.pdbx_alt_source_flag               sample 
_entity_src_gen.pdbx_seq_type                      ? 
_entity_src_gen.pdbx_beg_seq_num                   ? 
_entity_src_gen.pdbx_end_seq_num                   ? 
_entity_src_gen.gene_src_common_name               ? 
_entity_src_gen.gene_src_genus                     ? 
_entity_src_gen.pdbx_gene_src_gene                 ATXA 
_entity_src_gen.gene_src_species                   ? 
_entity_src_gen.gene_src_strain                    'ATCC 15261 / DSM 4724 / VKM B-1370 / CB 48' 
_entity_src_gen.gene_src_tissue                    ? 
_entity_src_gen.gene_src_tissue_fraction           ? 
_entity_src_gen.gene_src_details                   ? 
_entity_src_gen.pdbx_gene_src_fragment             ? 
_entity_src_gen.pdbx_gene_src_scientific_name      'Asticcacaulis excentricus' 
_entity_src_gen.pdbx_gene_src_ncbi_taxonomy_id     573065 
_entity_src_gen.pdbx_gene_src_variant              ? 
_entity_src_gen.pdbx_gene_src_cell_line            ? 
_entity_src_gen.pdbx_gene_src_atcc                 ? 
_entity_src_gen.pdbx_gene_src_organ                ? 
_entity_src_gen.pdbx_gene_src_organelle            ? 
_entity_src_gen.pdbx_gene_src_cell                 ? 
_entity_src_gen.pdbx_gene_src_cellular_location    ? 
_entity_src_gen.host_org_common_name               ? 
_entity_src_gen.pdbx_host_org_scientific_name      ? 
_entity_src_gen.pdbx_host_org_ncbi_taxonomy_id     ? 
_entity_src_gen.host_org_genus                     ? 
_entity_src_gen.pdbx_host_org_gene                 ? 
_entity_src_gen.pdbx_host_org_organ                ? 
_entity_src_gen.host_org_species                   ? 
_entity_src_gen.pdbx_host_org_tissue               ? 
_entity_src_gen.pdbx_host_org_tissue_fraction      ? 
_entity_src_gen.pdbx_host_org_strain               CB48 
_entity_src_gen.pdbx_host_org_variant              ? 
_entity_src_gen.pdbx_host_org_cell_line            ? 
_entity_src_gen.pdbx_host_org_atcc                 ? 
_entity_src_gen.pdbx_host_org_culture_collection   ? 
_entity_src_gen.pdbx_host_org_cell                 ? 
_entity_src_gen.pdbx_host_org_organelle            ? 
_entity_src_gen.pdbx_host_org_cellular_location    ? 
_entity_src_gen.pdbx_host_org_vector_type          PLASMID 
_entity_src_gen.pdbx_host_org_vector               PET41A 
_entity_src_gen.host_org_details                   ? 
_entity_src_gen.expression_system_id               ? 
_entity_src_gen.plasmid_name                       ? 
_entity_src_gen.plasmid_details                    ? 
_entity_src_gen.pdbx_description                   ? 
# 
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 
ARG 'L-peptide linking' y ARGININE        ? 'C6 H15 N4 O2 1' 175.209 
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  
ILE 'L-peptide linking' y ISOLEUCINE      ? 'C6 H13 N O2'    131.173 
LEU 'L-peptide linking' y LEUCINE         ? 'C6 H13 N O2'    131.173 
PHE 'L-peptide linking' y PHENYLALANINE   ? 'C9 H11 N O2'    165.189 
PRO 'L-peptide linking' y PROLINE         ? 'C5 H9 N O2'     115.130 
SER 'L-peptide linking' y SERINE          ? 'C3 H7 N O3'     105.093 
THR 'L-peptide linking' y THREONINE       ? 'C4 H9 N O3'     119.119 
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  GLY 1  1  1  GLY GLY A . n 
A 1 2  LEU 2  2  2  LEU LEU A . n 
A 1 3  SER 3  3  3  SER SER A . n 
A 1 4  GLN 4  4  4  GLN GLN A . n 
A 1 5  GLY 5  5  5  GLY GLY A . n 
A 1 6  VAL 6  6  6  VAL VAL A . n 
A 1 7  GLU 7  7  7  GLU GLU A . n 
A 1 8  PRO 8  8  8  PRO PRO A . n 
A 1 9  ASP 9  9  9  ASP ASP A . n 
A 1 10 ILE 10 10 10 ILE ILE A . n 
A 1 11 GLY 11 11 11 GLY GLY A . n 
A 1 12 GLN 12 12 12 GLN GLN A . n 
A 1 13 THR 13 13 13 THR THR A . n 
A 1 14 TYR 14 14 14 TYR TYR A . n 
A 1 15 PHE 15 15 15 PHE PHE A . n 
A 1 16 GLU 16 16 16 GLU GLU A . n 
A 1 17 GLU 17 17 17 GLU GLU A . n 
A 1 18 SER 18 18 18 SER SER A . n 
A 1 19 ARG 19 19 19 ARG ARG A . n 
# 
_exptl.absorpt_coefficient_mu     ? 
_exptl.absorpt_correction_T_max   ? 
_exptl.absorpt_correction_T_min   ? 
_exptl.absorpt_correction_type    ? 
_exptl.absorpt_process_details    ? 
_exptl.crystals_number            ? 
_exptl.details                    ? 
_exptl.entry_id                   2M37 
_exptl.method                     'SOLUTION NMR' 
_exptl.method_details             ? 
# 
_struct.entry_id                  2M37 
_struct.title                     'Structure of lasso peptide astexin-1' 
_struct.pdbx_model_details        'lowest energy, model1' 
_struct.pdbx_CASP_flag            ? 
_struct.pdbx_model_type_details   ? 
# 
_struct_keywords.entry_id        2M37 
_struct_keywords.pdbx_keywords   'UNKNOWN FUNCTION' 
_struct_keywords.text            'ASTEXIN-1, LASSO PEPTIDE, LARIAT PROTOKNOT, UNKNOWN FUNCTION' 
# 
_struct_asym.id                            A 
_struct_asym.pdbx_blank_PDB_chainid_flag   N 
_struct_asym.pdbx_modified                 N 
_struct_asym.entity_id                     1 
_struct_asym.details                       ? 
# 
_struct_ref.id                         1 
_struct_ref.db_name                    UNP 
_struct_ref.db_code                    E8RMD3_ASTEC 
_struct_ref.pdbx_db_accession          E8RMD3 
_struct_ref.entity_id                  1 
_struct_ref.pdbx_seq_one_letter_code   GLSQGVEPDIGQTYFEESR 
_struct_ref.pdbx_align_begin           29 
_struct_ref.pdbx_db_isoform            ? 
# 
_struct_ref_seq.align_id                      1 
_struct_ref_seq.ref_id                        1 
_struct_ref_seq.pdbx_PDB_id_code              2M37 
_struct_ref_seq.pdbx_strand_id                A 
_struct_ref_seq.seq_align_beg                 1 
_struct_ref_seq.pdbx_seq_align_beg_ins_code   ? 
_struct_ref_seq.seq_align_end                 19 
_struct_ref_seq.pdbx_seq_align_end_ins_code   ? 
_struct_ref_seq.pdbx_db_accession             E8RMD3 
_struct_ref_seq.db_align_beg                  29 
_struct_ref_seq.pdbx_db_align_beg_ins_code    ? 
_struct_ref_seq.db_align_end                  47 
_struct_ref_seq.pdbx_db_align_end_ins_code    ? 
_struct_ref_seq.pdbx_auth_seq_align_beg       1 
_struct_ref_seq.pdbx_auth_seq_align_end       19 
# 
_pdbx_struct_assembly.id                   1 
_pdbx_struct_assembly.details              author_defined_assembly 
_pdbx_struct_assembly.method_details       ? 
_pdbx_struct_assembly.oligomeric_details   monomeric 
_pdbx_struct_assembly.oligomeric_count     1 
# 
_pdbx_struct_assembly_gen.assembly_id       1 
_pdbx_struct_assembly_gen.oper_expression   1 
_pdbx_struct_assembly_gen.asym_id_list      A 
# 
_pdbx_struct_oper_list.id                   1 
_pdbx_struct_oper_list.type                 'identity operation' 
_pdbx_struct_oper_list.name                 1_555 
_pdbx_struct_oper_list.symmetry_operation   x,y,z 
_pdbx_struct_oper_list.matrix[1][1]         1.0000000000 
_pdbx_struct_oper_list.matrix[1][2]         0.0000000000 
_pdbx_struct_oper_list.matrix[1][3]         0.0000000000 
_pdbx_struct_oper_list.vector[1]            0.0000000000 
_pdbx_struct_oper_list.matrix[2][1]         0.0000000000 
_pdbx_struct_oper_list.matrix[2][2]         1.0000000000 
_pdbx_struct_oper_list.matrix[2][3]         0.0000000000 
_pdbx_struct_oper_list.vector[2]            0.0000000000 
_pdbx_struct_oper_list.matrix[3][1]         0.0000000000 
_pdbx_struct_oper_list.matrix[3][2]         0.0000000000 
_pdbx_struct_oper_list.matrix[3][3]         1.0000000000 
_pdbx_struct_oper_list.vector[3]            0.0000000000 
# 
_struct_biol.id        1 
_struct_biol.details   ? 
# 
_struct_conn.id                            covale1 
_struct_conn.conn_type_id                  covale 
_struct_conn.pdbx_leaving_atom_flag        one 
_struct_conn.pdbx_PDB_id                   ? 
_struct_conn.ptnr1_label_asym_id           A 
_struct_conn.ptnr1_label_comp_id           GLY 
_struct_conn.ptnr1_label_seq_id            1 
_struct_conn.ptnr1_label_atom_id           N 
_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                1_555 
_struct_conn.ptnr2_label_asym_id           A 
_struct_conn.ptnr2_label_comp_id           ASP 
_struct_conn.ptnr2_label_seq_id            9 
_struct_conn.ptnr2_label_atom_id           CG 
_struct_conn.pdbx_ptnr2_label_alt_id       ? 
_struct_conn.pdbx_ptnr2_PDB_ins_code       ? 
_struct_conn.ptnr1_auth_asym_id            A 
_struct_conn.ptnr1_auth_comp_id            GLY 
_struct_conn.ptnr1_auth_seq_id             1 
_struct_conn.ptnr2_auth_asym_id            A 
_struct_conn.ptnr2_auth_comp_id            ASP 
_struct_conn.ptnr2_auth_seq_id             9 
_struct_conn.ptnr2_symmetry                1_555 
_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               1.355 
_struct_conn.pdbx_value_order              ? 
_struct_conn.pdbx_role                     ? 
# 
_struct_conn_type.id          covale 
_struct_conn_type.criteria    ? 
_struct_conn_type.reference   ? 
# 
_pdbx_modification_feature.ordinal                            1 
_pdbx_modification_feature.label_comp_id                      GLY 
_pdbx_modification_feature.label_asym_id                      A 
_pdbx_modification_feature.label_seq_id                       1 
_pdbx_modification_feature.label_alt_id                       ? 
_pdbx_modification_feature.modified_residue_label_comp_id     ASP 
_pdbx_modification_feature.modified_residue_label_asym_id     A 
_pdbx_modification_feature.modified_residue_label_seq_id      9 
_pdbx_modification_feature.modified_residue_label_alt_id      ? 
_pdbx_modification_feature.auth_comp_id                       GLY 
_pdbx_modification_feature.auth_asym_id                       A 
_pdbx_modification_feature.auth_seq_id                        1 
_pdbx_modification_feature.PDB_ins_code                       ? 
_pdbx_modification_feature.symmetry                           1_555 
_pdbx_modification_feature.modified_residue_auth_comp_id      ASP 
_pdbx_modification_feature.modified_residue_auth_asym_id      A 
_pdbx_modification_feature.modified_residue_auth_seq_id       9 
_pdbx_modification_feature.modified_residue_PDB_ins_code      ? 
_pdbx_modification_feature.modified_residue_symmetry          1_555 
_pdbx_modification_feature.comp_id_linking_atom               N 
_pdbx_modification_feature.modified_residue_id_linking_atom   CG 
_pdbx_modification_feature.modified_residue_id                . 
_pdbx_modification_feature.ref_pcm_id                         . 
_pdbx_modification_feature.ref_comp_id                        . 
_pdbx_modification_feature.type                               None 
_pdbx_modification_feature.category                           'Isopeptide bond' 
# 
_pdbx_entry_details.entry_id                   2M37 
_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_validate_torsion.id 
_pdbx_validate_torsion.PDB_model_num 
_pdbx_validate_torsion.auth_comp_id 
_pdbx_validate_torsion.auth_asym_id 
_pdbx_validate_torsion.auth_seq_id 
_pdbx_validate_torsion.PDB_ins_code 
_pdbx_validate_torsion.label_alt_id 
_pdbx_validate_torsion.phi 
_pdbx_validate_torsion.psi 
1  1  GLN A 4  ? ? -119.86 51.51   
2  1  ASP A 9  ? ? -102.21 -62.27  
3  1  ILE A 10 ? ? -146.95 -64.72  
4  1  GLU A 17 ? ? -101.75 40.73   
5  2  ASP A 9  ? ? -101.17 -62.13  
6  2  ILE A 10 ? ? -148.22 -64.87  
7  2  GLU A 17 ? ? -99.77  40.25   
8  3  GLN A 4  ? ? -119.83 51.47   
9  3  ASP A 9  ? ? -99.61  -62.20  
10 3  ILE A 10 ? ? -148.03 -64.27  
11 3  GLN A 12 ? ? -114.37 55.89   
12 3  GLU A 17 ? ? -105.26 40.44   
13 4  GLN A 4  ? ? -119.86 51.57   
14 4  ASP A 9  ? ? -100.71 -61.79  
15 4  ILE A 10 ? ? -147.53 -64.49  
16 4  GLN A 12 ? ? -112.22 58.98   
17 4  GLU A 17 ? ? -100.39 40.49   
18 5  SER A 3  ? ? -160.39 -169.92 
19 5  ASP A 9  ? ? -101.42 -61.48  
20 5  ILE A 10 ? ? -146.63 -64.45  
21 5  GLN A 12 ? ? -114.15 56.03   
22 5  GLU A 17 ? ? -103.27 40.34   
23 6  GLN A 4  ? ? -119.96 51.52   
24 6  ASP A 9  ? ? -99.61  -61.24  
25 6  ILE A 10 ? ? -146.77 -64.30  
26 6  GLN A 12 ? ? -115.80 54.04   
27 6  GLU A 17 ? ? -102.16 40.50   
28 7  SER A 3  ? ? -162.33 -168.21 
29 7  ILE A 10 ? ? -146.37 -65.57  
30 8  ASP A 9  ? ? -109.48 -62.61  
31 8  ILE A 10 ? ? -147.23 -66.31  
32 8  GLU A 17 ? ? -99.81  40.96   
33 9  ILE A 10 ? ? -145.48 -65.52  
34 9  GLU A 17 ? ? -100.67 40.81   
35 10 ILE A 10 ? ? -146.05 -65.29  
36 10 GLU A 17 ? ? -101.15 40.11   
37 11 ILE A 10 ? ? -146.28 -65.42  
38 12 ASP A 9  ? ? -106.16 -60.96  
39 12 ILE A 10 ? ? -145.29 -65.34  
40 12 GLN A 12 ? ? -110.78 63.14   
41 12 GLU A 17 ? ? -101.59 40.07   
42 13 SER A 3  ? ? -161.25 -169.89 
43 13 ASP A 9  ? ? -106.95 -61.36  
44 13 ILE A 10 ? ? -146.23 -65.33  
45 13 GLN A 12 ? ? -110.13 63.87   
46 13 GLU A 17 ? ? -101.12 40.00   
47 14 ASP A 9  ? ? -107.10 -61.90  
48 14 ILE A 10 ? ? -147.23 -65.08  
49 15 ASP A 9  ? ? -107.96 -62.08  
50 15 ILE A 10 ? ? -146.89 -64.96  
51 15 GLN A 12 ? ? -111.04 61.50   
52 16 ASP A 9  ? ? -107.33 -62.20  
53 16 ILE A 10 ? ? -146.56 -66.11  
54 16 GLN A 12 ? ? -115.91 62.14   
55 16 GLU A 17 ? ? -101.68 40.08   
56 17 ILE A 10 ? ? -146.71 -65.30  
57 17 GLU A 17 ? ? -101.95 40.75   
58 18 ILE A 10 ? ? -146.71 -65.41  
59 18 GLU A 17 ? ? -100.57 40.33   
60 19 SER A 3  ? ? -162.33 -168.96 
61 19 ASP A 9  ? ? -109.59 -61.41  
62 19 ILE A 10 ? ? -145.80 -65.55  
63 19 GLU A 17 ? ? -100.41 40.76   
64 20 GLN A 4  ? ? -109.08 41.48   
65 20 ASP A 9  ? ? -109.43 -61.56  
66 20 ILE A 10 ? ? -146.32 -65.07  
67 20 GLN A 12 ? ? -112.72 62.63   
68 20 GLU A 17 ? ? -99.98  40.36   
# 
_pdbx_nmr_ensemble.average_constraint_violations_per_residue     ? 
_pdbx_nmr_ensemble.average_constraints_per_residue               ? 
_pdbx_nmr_ensemble.average_distance_constraint_violation         ? 
_pdbx_nmr_ensemble.average_torsion_angle_constraint_violation    ? 
_pdbx_nmr_ensemble.conformer_selection_criteria                  'structures with the lowest energy' 
_pdbx_nmr_ensemble.conformers_calculated_total_number            50 
_pdbx_nmr_ensemble.conformers_submitted_total_number             20 
_pdbx_nmr_ensemble.distance_constraint_violation_method          ? 
_pdbx_nmr_ensemble.entry_id                                      2M37 
_pdbx_nmr_ensemble.maximum_distance_constraint_violation         ? 
_pdbx_nmr_ensemble.maximum_lower_distance_constraint_violation   ? 
_pdbx_nmr_ensemble.maximum_torsion_angle_constraint_violation    ? 
_pdbx_nmr_ensemble.maximum_upper_distance_constraint_violation   ? 
_pdbx_nmr_ensemble.torsion_angle_constraint_violation_method     ? 
# 
_pdbx_nmr_representative.conformer_id         1 
_pdbx_nmr_representative.entry_id             2M37 
_pdbx_nmr_representative.selection_criteria   'lowest energy' 
# 
_pdbx_nmr_sample_details.contents         '5.7 mM ASTEXIN-1, 90% H2O/10% D2O' 
_pdbx_nmr_sample_details.solution_id      1 
_pdbx_nmr_sample_details.solvent_system   '90% H2O/10% D2O' 
# 
_pdbx_nmr_exptl_sample.component             'ASTEXIN-1(19)-1' 
_pdbx_nmr_exptl_sample.concentration         5.7 
_pdbx_nmr_exptl_sample.concentration_range   ? 
_pdbx_nmr_exptl_sample.concentration_units   mM 
_pdbx_nmr_exptl_sample.isotopic_labeling     ? 
_pdbx_nmr_exptl_sample.solution_id           1 
# 
_pdbx_nmr_exptl_sample_conditions.conditions_id       1 
_pdbx_nmr_exptl_sample_conditions.ionic_strength      ? 
_pdbx_nmr_exptl_sample_conditions.pH                  ? 
_pdbx_nmr_exptl_sample_conditions.pressure            ambient 
_pdbx_nmr_exptl_sample_conditions.pressure_units      atm 
_pdbx_nmr_exptl_sample_conditions.temperature         283 
_pdbx_nmr_exptl_sample_conditions.temperature_units   K 
# 
loop_
_pdbx_nmr_exptl.conditions_id 
_pdbx_nmr_exptl.experiment_id 
_pdbx_nmr_exptl.solution_id 
_pdbx_nmr_exptl.type 
1 1 1 '2D 1H-1H TOCSY' 
1 2 1 '2D DQF-COSY'    
1 3 1 '2D 1H-1H NOESY' 
# 
_pdbx_nmr_refine.entry_id           2M37 
_pdbx_nmr_refine.method             'simulated annealing' 
_pdbx_nmr_refine.details            ? 
_pdbx_nmr_refine.software_ordinal   1 
# 
loop_
_pdbx_nmr_software.authors 
_pdbx_nmr_software.classification 
_pdbx_nmr_software.name 
_pdbx_nmr_software.version 
_pdbx_nmr_software.ordinal 
'Guntert, Mumenthaler and Wuthrich' 'structure solution' CYANA 2.1 1 
'Guntert, Mumenthaler and Wuthrich' refinement           CYANA ?   2 
# 
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 
ARG N    N N N 1   
ARG CA   C N S 2   
ARG C    C N N 3   
ARG O    O N N 4   
ARG CB   C N N 5   
ARG CG   C N N 6   
ARG CD   C N N 7   
ARG NE   N N N 8   
ARG CZ   C N N 9   
ARG NH1  N N N 10  
ARG NH2  N N N 11  
ARG OXT  O N N 12  
ARG H    H N N 13  
ARG H2   H N N 14  
ARG HA   H N N 15  
ARG HB2  H N N 16  
ARG HB3  H N N 17  
ARG HG2  H N N 18  
ARG HG3  H N N 19  
ARG HD2  H N N 20  
ARG HD3  H N N 21  
ARG HE   H N N 22  
ARG HH11 H N N 23  
ARG HH12 H N N 24  
ARG HH21 H N N 25  
ARG HH22 H N N 26  
ARG HXT  H N N 27  
ASP N    N N N 28  
ASP CA   C N S 29  
ASP C    C N N 30  
ASP O    O N N 31  
ASP CB   C N N 32  
ASP CG   C N N 33  
ASP OD1  O N N 34  
ASP OD2  O N N 35  
ASP OXT  O N N 36  
ASP H    H N N 37  
ASP H2   H N N 38  
ASP HA   H N N 39  
ASP HB2  H N N 40  
ASP HB3  H N N 41  
ASP HD2  H N N 42  
ASP HXT  H N N 43  
GLN N    N N N 44  
GLN CA   C N S 45  
GLN C    C N N 46  
GLN O    O N N 47  
GLN CB   C N N 48  
GLN CG   C N N 49  
GLN CD   C N N 50  
GLN OE1  O N N 51  
GLN NE2  N N N 52  
GLN OXT  O N N 53  
GLN H    H N N 54  
GLN H2   H N N 55  
GLN HA   H N N 56  
GLN HB2  H N N 57  
GLN HB3  H N N 58  
GLN HG2  H N N 59  
GLN HG3  H N N 60  
GLN HE21 H N N 61  
GLN HE22 H N N 62  
GLN HXT  H N N 63  
GLU N    N N N 64  
GLU CA   C N S 65  
GLU C    C N N 66  
GLU O    O N N 67  
GLU CB   C N N 68  
GLU CG   C N N 69  
GLU CD   C N N 70  
GLU OE1  O N N 71  
GLU OE2  O N N 72  
GLU OXT  O N N 73  
GLU H    H N N 74  
GLU H2   H N N 75  
GLU HA   H N N 76  
GLU HB2  H N N 77  
GLU HB3  H N N 78  
GLU HG2  H N N 79  
GLU HG3  H N N 80  
GLU HE2  H N N 81  
GLU HXT  H N N 82  
GLY N    N N N 83  
GLY CA   C N N 84  
GLY C    C N N 85  
GLY O    O N N 86  
GLY OXT  O N N 87  
GLY H    H N N 88  
GLY H2   H N N 89  
GLY HA2  H N N 90  
GLY HA3  H N N 91  
GLY HXT  H N N 92  
ILE N    N N N 93  
ILE CA   C N S 94  
ILE C    C N N 95  
ILE O    O N N 96  
ILE CB   C N S 97  
ILE CG1  C N N 98  
ILE CG2  C N N 99  
ILE CD1  C N N 100 
ILE OXT  O N N 101 
ILE H    H N N 102 
ILE H2   H N N 103 
ILE HA   H N N 104 
ILE HB   H N N 105 
ILE HG12 H N N 106 
ILE HG13 H N N 107 
ILE HG21 H N N 108 
ILE HG22 H N N 109 
ILE HG23 H N N 110 
ILE HD11 H N N 111 
ILE HD12 H N N 112 
ILE HD13 H N N 113 
ILE HXT  H N N 114 
LEU N    N N N 115 
LEU CA   C N S 116 
LEU C    C N N 117 
LEU O    O N N 118 
LEU CB   C N N 119 
LEU CG   C N N 120 
LEU CD1  C N N 121 
LEU CD2  C N N 122 
LEU OXT  O N N 123 
LEU H    H N N 124 
LEU H2   H N N 125 
LEU HA   H N N 126 
LEU HB2  H N N 127 
LEU HB3  H N N 128 
LEU HG   H N N 129 
LEU HD11 H N N 130 
LEU HD12 H N N 131 
LEU HD13 H N N 132 
LEU HD21 H N N 133 
LEU HD22 H N N 134 
LEU HD23 H N N 135 
LEU HXT  H N N 136 
PHE N    N N N 137 
PHE CA   C N S 138 
PHE C    C N N 139 
PHE O    O N N 140 
PHE CB   C N N 141 
PHE CG   C Y N 142 
PHE CD1  C Y N 143 
PHE CD2  C Y N 144 
PHE CE1  C Y N 145 
PHE CE2  C Y N 146 
PHE CZ   C Y N 147 
PHE OXT  O N N 148 
PHE H    H N N 149 
PHE H2   H N N 150 
PHE HA   H N N 151 
PHE HB2  H N N 152 
PHE HB3  H N N 153 
PHE HD1  H N N 154 
PHE HD2  H N N 155 
PHE HE1  H N N 156 
PHE HE2  H N N 157 
PHE HZ   H N N 158 
PHE HXT  H N N 159 
PRO N    N N N 160 
PRO CA   C N S 161 
PRO C    C N N 162 
PRO O    O N N 163 
PRO CB   C N N 164 
PRO CG   C N N 165 
PRO CD   C N N 166 
PRO OXT  O N N 167 
PRO H    H N N 168 
PRO HA   H N N 169 
PRO HB2  H N N 170 
PRO HB3  H N N 171 
PRO HG2  H N N 172 
PRO HG3  H N N 173 
PRO HD2  H N N 174 
PRO HD3  H N N 175 
PRO HXT  H N N 176 
SER N    N N N 177 
SER CA   C N S 178 
SER C    C N N 179 
SER O    O N N 180 
SER CB   C N N 181 
SER OG   O N N 182 
SER OXT  O N N 183 
SER H    H N N 184 
SER H2   H N N 185 
SER HA   H N N 186 
SER HB2  H N N 187 
SER HB3  H N N 188 
SER HG   H N N 189 
SER HXT  H N N 190 
THR N    N N N 191 
THR CA   C N S 192 
THR C    C N N 193 
THR O    O N N 194 
THR CB   C N R 195 
THR OG1  O N N 196 
THR CG2  C N N 197 
THR OXT  O N N 198 
THR H    H N N 199 
THR H2   H N N 200 
THR HA   H N N 201 
THR HB   H N N 202 
THR HG1  H N N 203 
THR HG21 H N N 204 
THR HG22 H N N 205 
THR HG23 H N N 206 
THR HXT  H N N 207 
TYR N    N N N 208 
TYR CA   C N S 209 
TYR C    C N N 210 
TYR O    O N N 211 
TYR CB   C N N 212 
TYR CG   C Y N 213 
TYR CD1  C Y N 214 
TYR CD2  C Y N 215 
TYR CE1  C Y N 216 
TYR CE2  C Y N 217 
TYR CZ   C Y N 218 
TYR OH   O N N 219 
TYR OXT  O N N 220 
TYR H    H N N 221 
TYR H2   H N N 222 
TYR HA   H N N 223 
TYR HB2  H N N 224 
TYR HB3  H N N 225 
TYR HD1  H N N 226 
TYR HD2  H N N 227 
TYR HE1  H N N 228 
TYR HE2  H N N 229 
TYR HH   H N N 230 
TYR HXT  H N N 231 
VAL N    N N N 232 
VAL CA   C N S 233 
VAL C    C N N 234 
VAL O    O N N 235 
VAL CB   C N N 236 
VAL CG1  C N N 237 
VAL CG2  C N N 238 
VAL OXT  O N N 239 
VAL H    H N N 240 
VAL H2   H N N 241 
VAL HA   H N N 242 
VAL HB   H N N 243 
VAL HG11 H N N 244 
VAL HG12 H N N 245 
VAL HG13 H N N 246 
VAL HG21 H N N 247 
VAL HG22 H N N 248 
VAL HG23 H N N 249 
VAL HXT  H N N 250 
# 
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 
ARG N   CA   sing N N 1   
ARG N   H    sing N N 2   
ARG N   H2   sing N N 3   
ARG CA  C    sing N N 4   
ARG CA  CB   sing N N 5   
ARG CA  HA   sing N N 6   
ARG C   O    doub N N 7   
ARG C   OXT  sing N N 8   
ARG CB  CG   sing N N 9   
ARG CB  HB2  sing N N 10  
ARG CB  HB3  sing N N 11  
ARG CG  CD   sing N N 12  
ARG CG  HG2  sing N N 13  
ARG CG  HG3  sing N N 14  
ARG CD  NE   sing N N 15  
ARG CD  HD2  sing N N 16  
ARG CD  HD3  sing N N 17  
ARG NE  CZ   sing N N 18  
ARG NE  HE   sing N N 19  
ARG CZ  NH1  sing N N 20  
ARG CZ  NH2  doub N N 21  
ARG NH1 HH11 sing N N 22  
ARG NH1 HH12 sing N N 23  
ARG NH2 HH21 sing N N 24  
ARG NH2 HH22 sing N N 25  
ARG OXT HXT  sing N N 26  
ASP N   CA   sing N N 27  
ASP N   H    sing N N 28  
ASP N   H2   sing N N 29  
ASP CA  C    sing N N 30  
ASP CA  CB   sing N N 31  
ASP CA  HA   sing N N 32  
ASP C   O    doub N N 33  
ASP C   OXT  sing N N 34  
ASP CB  CG   sing N N 35  
ASP CB  HB2  sing N N 36  
ASP CB  HB3  sing N N 37  
ASP CG  OD1  doub N N 38  
ASP CG  OD2  sing N N 39  
ASP OD2 HD2  sing N N 40  
ASP OXT HXT  sing N N 41  
GLN N   CA   sing N N 42  
GLN N   H    sing N N 43  
GLN N   H2   sing N N 44  
GLN CA  C    sing N N 45  
GLN CA  CB   sing N N 46  
GLN CA  HA   sing N N 47  
GLN C   O    doub N N 48  
GLN C   OXT  sing N N 49  
GLN CB  CG   sing N N 50  
GLN CB  HB2  sing N N 51  
GLN CB  HB3  sing N N 52  
GLN CG  CD   sing N N 53  
GLN CG  HG2  sing N N 54  
GLN CG  HG3  sing N N 55  
GLN CD  OE1  doub N N 56  
GLN CD  NE2  sing N N 57  
GLN NE2 HE21 sing N N 58  
GLN NE2 HE22 sing N N 59  
GLN OXT HXT  sing N N 60  
GLU N   CA   sing N N 61  
GLU N   H    sing N N 62  
GLU N   H2   sing N N 63  
GLU CA  C    sing N N 64  
GLU CA  CB   sing N N 65  
GLU CA  HA   sing N N 66  
GLU C   O    doub N N 67  
GLU C   OXT  sing N N 68  
GLU CB  CG   sing N N 69  
GLU CB  HB2  sing N N 70  
GLU CB  HB3  sing N N 71  
GLU CG  CD   sing N N 72  
GLU CG  HG2  sing N N 73  
GLU CG  HG3  sing N N 74  
GLU CD  OE1  doub N N 75  
GLU CD  OE2  sing N N 76  
GLU OE2 HE2  sing N N 77  
GLU OXT HXT  sing N N 78  
GLY N   CA   sing N N 79  
GLY N   H    sing N N 80  
GLY N   H2   sing N N 81  
GLY CA  C    sing N N 82  
GLY CA  HA2  sing N N 83  
GLY CA  HA3  sing N N 84  
GLY C   O    doub N N 85  
GLY C   OXT  sing N N 86  
GLY OXT HXT  sing N N 87  
ILE N   CA   sing N N 88  
ILE N   H    sing N N 89  
ILE N   H2   sing N N 90  
ILE CA  C    sing N N 91  
ILE CA  CB   sing N N 92  
ILE CA  HA   sing N N 93  
ILE C   O    doub N N 94  
ILE C   OXT  sing N N 95  
ILE CB  CG1  sing N N 96  
ILE CB  CG2  sing N N 97  
ILE CB  HB   sing N N 98  
ILE CG1 CD1  sing N N 99  
ILE CG1 HG12 sing N N 100 
ILE CG1 HG13 sing N N 101 
ILE CG2 HG21 sing N N 102 
ILE CG2 HG22 sing N N 103 
ILE CG2 HG23 sing N N 104 
ILE CD1 HD11 sing N N 105 
ILE CD1 HD12 sing N N 106 
ILE CD1 HD13 sing N N 107 
ILE OXT HXT  sing N N 108 
LEU N   CA   sing N N 109 
LEU N   H    sing N N 110 
LEU N   H2   sing N N 111 
LEU CA  C    sing N N 112 
LEU CA  CB   sing N N 113 
LEU CA  HA   sing N N 114 
LEU C   O    doub N N 115 
LEU C   OXT  sing N N 116 
LEU CB  CG   sing N N 117 
LEU CB  HB2  sing N N 118 
LEU CB  HB3  sing N N 119 
LEU CG  CD1  sing N N 120 
LEU CG  CD2  sing N N 121 
LEU CG  HG   sing N N 122 
LEU CD1 HD11 sing N N 123 
LEU CD1 HD12 sing N N 124 
LEU CD1 HD13 sing N N 125 
LEU CD2 HD21 sing N N 126 
LEU CD2 HD22 sing N N 127 
LEU CD2 HD23 sing N N 128 
LEU OXT HXT  sing N N 129 
PHE N   CA   sing N N 130 
PHE N   H    sing N N 131 
PHE N   H2   sing N N 132 
PHE CA  C    sing N N 133 
PHE CA  CB   sing N N 134 
PHE CA  HA   sing N N 135 
PHE C   O    doub N N 136 
PHE C   OXT  sing N N 137 
PHE CB  CG   sing N N 138 
PHE CB  HB2  sing N N 139 
PHE CB  HB3  sing N N 140 
PHE CG  CD1  doub Y N 141 
PHE CG  CD2  sing Y N 142 
PHE CD1 CE1  sing Y N 143 
PHE CD1 HD1  sing N N 144 
PHE CD2 CE2  doub Y N 145 
PHE CD2 HD2  sing N N 146 
PHE CE1 CZ   doub Y N 147 
PHE CE1 HE1  sing N N 148 
PHE CE2 CZ   sing Y N 149 
PHE CE2 HE2  sing N N 150 
PHE CZ  HZ   sing N N 151 
PHE OXT HXT  sing N N 152 
PRO N   CA   sing N N 153 
PRO N   CD   sing N N 154 
PRO N   H    sing N N 155 
PRO CA  C    sing N N 156 
PRO CA  CB   sing N N 157 
PRO CA  HA   sing N N 158 
PRO C   O    doub N N 159 
PRO C   OXT  sing N N 160 
PRO CB  CG   sing N N 161 
PRO CB  HB2  sing N N 162 
PRO CB  HB3  sing N N 163 
PRO CG  CD   sing N N 164 
PRO CG  HG2  sing N N 165 
PRO CG  HG3  sing N N 166 
PRO CD  HD2  sing N N 167 
PRO CD  HD3  sing N N 168 
PRO OXT HXT  sing N N 169 
SER N   CA   sing N N 170 
SER N   H    sing N N 171 
SER N   H2   sing N N 172 
SER CA  C    sing N N 173 
SER CA  CB   sing N N 174 
SER CA  HA   sing N N 175 
SER C   O    doub N N 176 
SER C   OXT  sing N N 177 
SER CB  OG   sing N N 178 
SER CB  HB2  sing N N 179 
SER CB  HB3  sing N N 180 
SER OG  HG   sing N N 181 
SER OXT HXT  sing N N 182 
THR N   CA   sing N N 183 
THR N   H    sing N N 184 
THR N   H2   sing N N 185 
THR CA  C    sing N N 186 
THR CA  CB   sing N N 187 
THR CA  HA   sing N N 188 
THR C   O    doub N N 189 
THR C   OXT  sing N N 190 
THR CB  OG1  sing N N 191 
THR CB  CG2  sing N N 192 
THR CB  HB   sing N N 193 
THR OG1 HG1  sing N N 194 
THR CG2 HG21 sing N N 195 
THR CG2 HG22 sing N N 196 
THR CG2 HG23 sing N N 197 
THR OXT HXT  sing N N 198 
TYR N   CA   sing N N 199 
TYR N   H    sing N N 200 
TYR N   H2   sing N N 201 
TYR CA  C    sing N N 202 
TYR CA  CB   sing N N 203 
TYR CA  HA   sing N N 204 
TYR C   O    doub N N 205 
TYR C   OXT  sing N N 206 
TYR CB  CG   sing N N 207 
TYR CB  HB2  sing N N 208 
TYR CB  HB3  sing N N 209 
TYR CG  CD1  doub Y N 210 
TYR CG  CD2  sing Y N 211 
TYR CD1 CE1  sing Y N 212 
TYR CD1 HD1  sing N N 213 
TYR CD2 CE2  doub Y N 214 
TYR CD2 HD2  sing N N 215 
TYR CE1 CZ   doub Y N 216 
TYR CE1 HE1  sing N N 217 
TYR CE2 CZ   sing Y N 218 
TYR CE2 HE2  sing N N 219 
TYR CZ  OH   sing N N 220 
TYR OH  HH   sing N N 221 
TYR OXT HXT  sing N N 222 
VAL N   CA   sing N N 223 
VAL N   H    sing N N 224 
VAL N   H2   sing N N 225 
VAL CA  C    sing N N 226 
VAL CA  CB   sing N N 227 
VAL CA  HA   sing N N 228 
VAL C   O    doub N N 229 
VAL C   OXT  sing N N 230 
VAL CB  CG1  sing N N 231 
VAL CB  CG2  sing N N 232 
VAL CB  HB   sing N N 233 
VAL CG1 HG11 sing N N 234 
VAL CG1 HG12 sing N N 235 
VAL CG1 HG13 sing N N 236 
VAL CG2 HG21 sing N N 237 
VAL CG2 HG22 sing N N 238 
VAL CG2 HG23 sing N N 239 
VAL OXT HXT  sing N N 240 
# 
_pdbx_nmr_spectrometer.field_strength    600 
_pdbx_nmr_spectrometer.manufacturer      Bruker 
_pdbx_nmr_spectrometer.model             AVANCE 
_pdbx_nmr_spectrometer.spectrometer_id   1 
_pdbx_nmr_spectrometer.type              'Bruker Avance' 
# 
_atom_sites.entry_id                    2M37 
_atom_sites.fract_transf_matrix[1][1]   1.000000 
_atom_sites.fract_transf_matrix[1][2]   0.000000 
_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]   1.000000 
_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]   1.000000 
_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 
H 
N 
O 
# 
loop_