data_1JZP # _entry.id 1JZP # _audit_conform.dict_name mmcif_pdbx.dic _audit_conform.dict_version 5.355 _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 1JZP pdb_00001jzp 10.2210/pdb1jzp/pdb RCSB RCSB014377 ? ? WWPDB D_1000014377 ? ? # _pdbx_database_related.db_name PDB _pdbx_database_related.db_id 1DU1 _pdbx_database_related.details 'Peptide Fragment Thr671-Leu690 of the Rabbit skeletal dihydropyridine Receptor' _pdbx_database_related.content_type unspecified # _pdbx_database_status.status_code REL _pdbx_database_status.entry_id 1JZP _pdbx_database_status.recvd_initial_deposition_date 2001-09-17 _pdbx_database_status.deposit_site RCSB _pdbx_database_status.process_site RCSB _pdbx_database_status.status_code_mr REL _pdbx_database_status.status_code_sf ? _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 'Green, D.' 1 'Pace, S.' 2 'Sakowska, M.' 3 'Dulhunty, A.F.' 4 'Casarotto, M.G.' 5 # _citation.id primary _citation.title ;The three-dimensional structural surface of two beta-sheet scorpion toxins mimics that of an alpha-helical dihydropyridine receptor segment. ; _citation.journal_abbrev Biochem.J. _citation.journal_volume 370 _citation.page_first 517 _citation.page_last 527 _citation.year 2003 _citation.journal_id_ASTM BIJOAK _citation.country UK _citation.journal_id_ISSN 0264-6021 _citation.journal_id_CSD 0043 _citation.book_publisher ? _citation.pdbx_database_id_PubMed 12429019 _citation.pdbx_database_id_DOI 10.1042/BJ20021488 # loop_ _citation_author.citation_id _citation_author.name _citation_author.ordinal _citation_author.identifier_ORCID primary 'Green, D.' 1 ? primary 'Pace, S.' 2 ? primary 'Curtis, S.M.' 3 ? primary 'Sakowska, M.' 4 ? primary 'Lamb, G.D.' 5 ? primary 'Dulhunty, A.F.' 6 ? primary 'Casarotto, M.G.' 7 ? # _cell.entry_id 1JZP _cell.length_a ? _cell.length_b ? _cell.length_c ? _cell.angle_alpha ? _cell.angle_beta ? _cell.angle_gamma ? _cell.Z_PDB 1 _cell.pdbx_unique_axis ? # _entity.id 1 _entity.type polymer _entity.src_method syn _entity.pdbx_description 'Skeletal Dihydropydrine Receptor' _entity.formula_weight 2337.772 _entity.pdbx_number_of_molecules 1 _entity.pdbx_ec ? _entity.pdbx_mutation 'Arg688 from L to D isomer' _entity.pdbx_fragment D18-A1 _entity.details ? # _entity_poly.entity_id 1 _entity_poly.type 'polypeptide(L)' _entity_poly.nstd_linkage no _entity_poly.nstd_monomer yes _entity_poly.pdbx_seq_one_letter_code 'TSAQKAKAEERKRRKMSRGL(NH2)' _entity_poly.pdbx_seq_one_letter_code_can TSAQKAKAEERKRRKMSRGLX _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 THR n 1 2 SER n 1 3 ALA n 1 4 GLN n 1 5 LYS n 1 6 ALA n 1 7 LYS n 1 8 ALA n 1 9 GLU n 1 10 GLU n 1 11 ARG n 1 12 LYS n 1 13 ARG n 1 14 ARG n 1 15 LYS n 1 16 MET n 1 17 SER n 1 18 ARG n 1 19 GLY n 1 20 LEU n 1 21 NH2 n # _pdbx_entity_src_syn.entity_id 1 _pdbx_entity_src_syn.pdbx_src_id 1 _pdbx_entity_src_syn.pdbx_alt_source_flag sample _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 'This sequence is a modification of a segment of a protein that occurs naturally in rabbit skeletal muscle.' # _struct_ref.id 1 _struct_ref.entity_id 1 _struct_ref.db_name PDB _struct_ref.db_code 1JZP _struct_ref.pdbx_db_accession 1JZP _struct_ref.pdbx_db_isoform ? _struct_ref.pdbx_seq_one_letter_code ? _struct_ref.pdbx_align_begin ? # _struct_ref_seq.align_id 1 _struct_ref_seq.ref_id 1 _struct_ref_seq.pdbx_PDB_id_code 1JZP _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 21 _struct_ref_seq.pdbx_seq_align_end_ins_code ? _struct_ref_seq.pdbx_db_accession 1JZP _struct_ref_seq.db_align_beg 1 _struct_ref_seq.pdbx_db_align_beg_ins_code ? _struct_ref_seq.db_align_end 21 _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 21 # 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 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 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 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 NH2 non-polymer . 'AMINO GROUP' ? 'H2 N' 16.023 SER 'L-peptide linking' y SERINE ? 'C3 H7 N O3' 105.093 THR 'L-peptide linking' y THREONINE ? 'C4 H9 N O3' 119.119 # loop_ _pdbx_nmr_exptl.experiment_id _pdbx_nmr_exptl.solution_id _pdbx_nmr_exptl.conditions_id _pdbx_nmr_exptl.type 1 1 1 '2D NOESY' 2 1 1 DQF-COSY # _pdbx_nmr_exptl_sample_conditions.conditions_id 1 _pdbx_nmr_exptl_sample_conditions.temperature 278 _pdbx_nmr_exptl_sample_conditions.pressure 1 _pdbx_nmr_exptl_sample_conditions.pH 5.0 _pdbx_nmr_exptl_sample_conditions.ionic_strength ? _pdbx_nmr_exptl_sample_conditions.pressure_units atm _pdbx_nmr_exptl_sample_conditions.temperature_units K # _pdbx_nmr_sample_details.solution_id 1 _pdbx_nmr_sample_details.contents '2-3 mM DHPR peptide, unbuffered' _pdbx_nmr_sample_details.solvent_system '90% H2O/10% D2O' # _pdbx_nmr_spectrometer.spectrometer_id 1 _pdbx_nmr_spectrometer.type ? _pdbx_nmr_spectrometer.manufacturer Varian _pdbx_nmr_spectrometer.model INOVA _pdbx_nmr_spectrometer.field_strength 600 # _pdbx_nmr_refine.entry_id 1JZP _pdbx_nmr_refine.method ;Distance Geometry Simulated annealing refinement ; _pdbx_nmr_refine.details ;The structure is based on a total of 239 restraints of which 222 are NOE-derived, 12 are dihedral angle restraints and 5 are distance restraints from hydrogen bonds. ; _pdbx_nmr_refine.software_ordinal 1 # _pdbx_nmr_details.entry_id 1JZP _pdbx_nmr_details.text 'This structure was determined by using standard 2D homonuclear techniques.' # _pdbx_nmr_ensemble.entry_id 1JZP _pdbx_nmr_ensemble.conformers_calculated_total_number 17 _pdbx_nmr_ensemble.conformers_submitted_total_number 1 _pdbx_nmr_ensemble.conformer_selection_criteria ? _pdbx_nmr_ensemble.average_constraints_per_residue ? _pdbx_nmr_ensemble.average_constraint_violations_per_residue ? _pdbx_nmr_ensemble.maximum_distance_constraint_violation ? _pdbx_nmr_ensemble.average_distance_constraint_violation ? _pdbx_nmr_ensemble.maximum_upper_distance_constraint_violation ? _pdbx_nmr_ensemble.maximum_lower_distance_constraint_violation ? _pdbx_nmr_ensemble.distance_constraint_violation_method ? _pdbx_nmr_ensemble.maximum_torsion_angle_constraint_violation ? _pdbx_nmr_ensemble.average_torsion_angle_constraint_violation ? _pdbx_nmr_ensemble.torsion_angle_constraint_violation_method ? # _pdbx_nmr_representative.entry_id 1JZP _pdbx_nmr_representative.conformer_id 1 _pdbx_nmr_representative.selection_criteria 'closest to the average' # _pdbx_nmr_software.name X-PLOR _pdbx_nmr_software.version 3.851 _pdbx_nmr_software.classification refinement _pdbx_nmr_software.authors Brunger _pdbx_nmr_software.ordinal 1 # _exptl.entry_id 1JZP _exptl.method 'SOLUTION NMR' _exptl.crystals_number ? # _exptl_crystal.id 1 _exptl_crystal.density_meas ? _exptl_crystal.density_Matthews ? _exptl_crystal.density_percent_sol ? _exptl_crystal.description ? # _diffrn.id 1 _diffrn.ambient_temp ? _diffrn.ambient_temp_details ? _diffrn.crystal_id 1 # _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 ? # _diffrn_radiation_wavelength.id 1 _diffrn_radiation_wavelength.wavelength . _diffrn_radiation_wavelength.wt 1.0 # _struct.entry_id 1JZP _struct.title 'Modified Peptide A (D18-A1) of the Rabbit Skeletal Dihydropyridine Receptor' _struct.pdbx_model_details ? _struct.pdbx_CASP_flag ? _struct.pdbx_model_type_details ? # _struct_keywords.entry_id 1JZP _struct_keywords.pdbx_keywords 'SIGNALING PROTEIN' _struct_keywords.text 'Alpha helical peptide, DHPR, D-isomer, SIGNALING PROTEIN' # _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_biol.id 1 _struct_biol.pdbx_parent_biol_id ? _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 THR A 1 ? LYS A 5 ? THR A 1 LYS A 5 5 ? 5 HELX_P HELX_P2 2 ALA A 6 ? GLY A 19 ? ALA A 6 GLY A 19 1 ? 14 # _struct_conf_type.id HELX_P _struct_conf_type.criteria ? _struct_conf_type.reference ? # _struct_conn.id covale1 _struct_conn.conn_type_id covale _struct_conn.pdbx_leaving_atom_flag both _struct_conn.pdbx_PDB_id ? _struct_conn.ptnr1_label_asym_id A _struct_conn.ptnr1_label_comp_id LEU _struct_conn.ptnr1_label_seq_id 20 _struct_conn.ptnr1_label_atom_id C _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 NH2 _struct_conn.ptnr2_label_seq_id 21 _struct_conn.ptnr2_label_atom_id N _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 LEU _struct_conn.ptnr1_auth_seq_id 20 _struct_conn.ptnr2_auth_asym_id A _struct_conn.ptnr2_auth_comp_id NH2 _struct_conn.ptnr2_auth_seq_id 21 _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 1.305 _struct_conn.pdbx_value_order ? _struct_conn.pdbx_role ? # _struct_conn_type.id covale _struct_conn_type.criteria ? _struct_conn_type.reference ? # _struct_site.id AC1 _struct_site.pdbx_evidence_code Software _struct_site.pdbx_auth_asym_id A _struct_site.pdbx_auth_comp_id NH2 _struct_site.pdbx_auth_seq_id 21 _struct_site.pdbx_auth_ins_code ? _struct_site.pdbx_num_residues 2 _struct_site.details 'BINDING SITE FOR RESIDUE NH2 A 21' # loop_ _struct_site_gen.id _struct_site_gen.site_id _struct_site_gen.pdbx_num_res _struct_site_gen.label_comp_id _struct_site_gen.label_asym_id _struct_site_gen.label_seq_id _struct_site_gen.pdbx_auth_ins_code _struct_site_gen.auth_comp_id _struct_site_gen.auth_asym_id _struct_site_gen.auth_seq_id _struct_site_gen.label_atom_id _struct_site_gen.label_alt_id _struct_site_gen.symmetry _struct_site_gen.details 1 AC1 2 GLY A 19 ? GLY A 19 . ? 1_555 ? 2 AC1 2 LEU A 20 ? LEU A 20 . ? 1_555 ? # _database_PDB_matrix.entry_id 1JZP _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 # _atom_sites.entry_id 1JZP _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 S # 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 THR 1 1 1 THR THR A . n A 1 2 SER 2 2 2 SER SER A . n A 1 3 ALA 3 3 3 ALA ALA A . n A 1 4 GLN 4 4 4 GLN GLN A . n A 1 5 LYS 5 5 5 LYS LYS A . n A 1 6 ALA 6 6 6 ALA ALA A . n A 1 7 LYS 7 7 7 LYS LYS A . n A 1 8 ALA 8 8 8 ALA ALA A . n A 1 9 GLU 9 9 9 GLU GLU A . n A 1 10 GLU 10 10 10 GLU GLU A . n A 1 11 ARG 11 11 11 ARG ARG A . n A 1 12 LYS 12 12 12 LYS LYS A . n A 1 13 ARG 13 13 13 ARG ARG A . n A 1 14 ARG 14 14 14 ARG ARG A . n A 1 15 LYS 15 15 15 LYS LYS A . n A 1 16 MET 16 16 16 MET MET A . n A 1 17 SER 17 17 17 SER SER A . n A 1 18 ARG 18 18 18 ARG ARG A . n A 1 19 GLY 19 19 19 GLY GLY A . n A 1 20 LEU 20 20 20 LEU LEU A . n A 1 21 NH2 21 21 20 NH2 LEU A . n # _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 # 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 2002-03-20 2 'Structure model' 1 1 2008-04-27 3 'Structure model' 1 2 2011-07-13 4 'Structure model' 1 3 2022-02-23 # _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' 'Version format compliance' 3 4 'Structure model' 'Database references' 4 4 'Structure model' 'Derived calculations' # 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 4 'Structure model' database_2 2 4 'Structure model' pdbx_struct_assembly 3 4 'Structure model' pdbx_struct_oper_list 4 4 'Structure model' struct_conn 5 4 'Structure model' struct_site # 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 4 'Structure model' '_database_2.pdbx_DOI' 2 4 'Structure model' '_database_2.pdbx_database_accession' 3 4 'Structure model' '_struct_conn.pdbx_leaving_atom_flag' 4 4 'Structure model' '_struct_site.pdbx_auth_asym_id' 5 4 'Structure model' '_struct_site.pdbx_auth_comp_id' 6 4 'Structure model' '_struct_site.pdbx_auth_seq_id' # 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 ALA A 6 ? ? 178.70 -45.50 2 1 ARG A 18 ? ? -90.21 32.54 # loop_ _pdbx_validate_planes.id _pdbx_validate_planes.PDB_model_num _pdbx_validate_planes.auth_comp_id _pdbx_validate_planes.auth_asym_id _pdbx_validate_planes.auth_seq_id _pdbx_validate_planes.PDB_ins_code _pdbx_validate_planes.label_alt_id _pdbx_validate_planes.rmsd _pdbx_validate_planes.type 1 1 ARG A 11 ? ? 0.143 'SIDE CHAIN' 2 1 ARG A 13 ? ? 0.271 'SIDE CHAIN' 3 1 ARG A 14 ? ? 0.195 'SIDE CHAIN' 4 1 ARG A 18 ? ? 0.093 'SIDE CHAIN' #