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- PDB-1ecy: PROTEASE INHIBITOR ECOTIN -

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Basic information

Entry
Database: PDB / ID: 1ecy
TitlePROTEASE INHIBITOR ECOTIN
ComponentsECOTIN
KeywordsPROTEASE INHIBITOR / BETA-SHEET STRUCTURE / SERINE PROTEASE INHIBITOR / PERIPLASMIC
Function / homology
Function and homology information


serine-type endopeptidase inhibitor activity / defense response / outer membrane-bounded periplasmic space / protein homodimerization activity
Similarity search - Function
Ecotin / Ecotin, C-terminal / Proteinase inhibitor I11, ecotin / Proteinase inhibitor I11, ecotin, gammaproteobacteria / Ecotin superfamily / Ecotin / Immunoglobulin-like / Sandwich / Mainly Beta
Similarity search - Domain/homology
trehalose / beta-D-glucopyranose / alpha-D-glucopyranose / Ecotin
Similarity search - Component
Biological speciesEscherichia coli (E. coli)
MethodX-RAY DIFFRACTION / SYNCHROTRON / MOLECULAR REPLACEMENT / Resolution: 2.19 Å
AuthorsShin, D.H. / Suh, S.W.
Citation
Journal: Protein Sci. / Year: 1996
Title: Crystal structure analyses of uncomplexed ecotin in two crystal forms: implications for its function and stability.
Authors: Shin, D.H. / Song, H.K. / Seong, I.S. / Lee, C.S. / Chung, C.H. / Suh, S.W.
#1: Journal: J.Mol.Biol. / Year: 1993
Title: Crystallization and Preliminary X-Ray Crystallographic Analysis of the Protease Inhibitor Ecotin
Authors: Shin, D.H. / Hwang, K.Y. / Kim, K.K. / Lee, H.R. / Lee, C.S. / Chung, C.H. / Suh, S.W.
History
DepositionAug 6, 1996Processing site: BNL
Revision 1.0Feb 12, 1997Provider: repository / Type: Initial release
Revision 1.1Mar 28, 2008Group: Version format compliance
Revision 1.2Jul 13, 2011Group: Version format compliance
Revision 2.0Jul 29, 2020Group: Atomic model / Data collection ...Atomic model / Data collection / Derived calculations / Other / Structure summary
Category: atom_site / chem_comp ...atom_site / chem_comp / entity / pdbx_branch_scheme / pdbx_chem_comp_identifier / pdbx_database_status / pdbx_entity_branch / pdbx_entity_branch_descriptor / pdbx_entity_branch_link / pdbx_entity_branch_list / pdbx_entity_nonpoly / pdbx_nonpoly_scheme / pdbx_struct_assembly_gen / struct_asym / struct_conn / struct_site / struct_site_gen
Item: _atom_site.auth_asym_id / _atom_site.auth_seq_id ..._atom_site.auth_asym_id / _atom_site.auth_seq_id / _atom_site.label_asym_id / _atom_site.label_entity_id / _chem_comp.name / _chem_comp.type / _pdbx_database_status.process_site / _pdbx_entity_nonpoly.entity_id / _pdbx_entity_nonpoly.name / _pdbx_struct_assembly_gen.asym_id_list / _struct_conn.pdbx_dist_value / _struct_conn.pdbx_leaving_atom_flag / _struct_conn.ptnr1_auth_asym_id / _struct_conn.ptnr1_auth_comp_id / _struct_conn.ptnr1_auth_seq_id / _struct_conn.ptnr1_label_asym_id / _struct_conn.ptnr1_label_comp_id / _struct_conn.ptnr2_auth_asym_id / _struct_conn.ptnr2_auth_comp_id / _struct_conn.ptnr2_auth_seq_id / _struct_conn.ptnr2_label_asym_id / _struct_conn.ptnr2_label_comp_id
Description: Carbohydrate remediation / Provider: repository / Type: Remediation
Revision 3.0Oct 14, 2020Group: Atomic model / Data collection ...Atomic model / Data collection / Derived calculations / Structure summary
Category: atom_site / chem_comp ...atom_site / chem_comp / entity / pdbx_branch_scheme / pdbx_entity_branch / pdbx_entity_branch_descriptor / pdbx_entity_branch_link / pdbx_entity_branch_list / pdbx_entity_nonpoly / pdbx_molecule_features / pdbx_nonpoly_scheme / pdbx_validate_chiral / struct_asym / struct_conn
Item: _atom_site.B_iso_or_equiv / _atom_site.Cartn_x ..._atom_site.B_iso_or_equiv / _atom_site.Cartn_x / _atom_site.Cartn_y / _atom_site.Cartn_z / _atom_site.auth_asym_id / _atom_site.auth_atom_id / _atom_site.auth_comp_id / _atom_site.auth_seq_id / _atom_site.label_atom_id / _atom_site.label_comp_id / _atom_site.label_entity_id / _atom_site.type_symbol / _chem_comp.pdbx_synonyms / _pdbx_branch_scheme.auth_mon_id / _pdbx_branch_scheme.auth_seq_num / _pdbx_branch_scheme.entity_id / _pdbx_branch_scheme.mon_id / _pdbx_branch_scheme.pdb_asym_id / _pdbx_branch_scheme.pdb_mon_id / _pdbx_entity_nonpoly.entity_id / _pdbx_nonpoly_scheme.entity_id / _struct_asym.entity_id / _struct_conn.pdbx_dist_value / _struct_conn.pdbx_value_order / _struct_conn.ptnr1_auth_asym_id / _struct_conn.ptnr1_auth_comp_id / _struct_conn.ptnr1_label_atom_id / _struct_conn.ptnr1_label_comp_id / _struct_conn.ptnr2_auth_asym_id / _struct_conn.ptnr2_auth_comp_id / _struct_conn.ptnr2_label_atom_id / _struct_conn.ptnr2_label_comp_id
Revision 3.1Apr 3, 2024Group: Data collection / Database references / Refinement description
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / database_2 / pdbx_initial_refinement_model
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession
Revision 3.2Oct 30, 2024Group: Structure summary / Category: pdbx_entry_details / pdbx_modification_feature

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: ECOTIN
hetero molecules


Theoretical massNumber of molelcules
Total (without water)21,47119
Polymers16,1211
Non-polymers5,35118
Water1,44180
1
A: ECOTIN
hetero molecules

A: ECOTIN
hetero molecules


Theoretical massNumber of molelcules
Total (without water)42,94238
Polymers32,2412
Non-polymers10,70136
Water362
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
crystal symmetry operation8_665-y+1,-x+1,-z+1/21
Unit cell
Length a, b, c (Å)63.320, 63.320, 84.130
Angle α, β, γ (deg.)90.00, 90.00, 90.00
Int Tables number96
Space group name H-MP43212

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Components

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Protein / Non-polymers , 2 types, 81 molecules A

#1: Protein ECOTIN


Mass: 16120.507 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Details: ESCHERICHIA COLI PROTEASE INHIBITOR / Source: (gene. exp.) Escherichia coli (E. coli) / Plasmid: PBS / Gene (production host): ETI GENE / Production host: Escherichia coli (E. coli) / References: UniProt: P23827
#6: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 80 / Source method: isolated from a natural source / Formula: H2O

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Sugars , 4 types, 18 molecules

#2: Polysaccharide
alpha-D-glucopyranose-(1-1)-alpha-D-glucopyranose


Type: oligosaccharide, Oligosaccharide / Class: Nutrient / Mass: 342.297 Da / Num. of mol.: 8
Source method: isolated from a genetically manipulated source
Details: oligosaccharide with reducing-end-to-reducing-end glycosidic bond
References: trehalose
DescriptorTypeProgram
DGlcpa1-1DGlcpaGlycam Condensed SequenceGMML 1.0
WURCS=2.0/1,2,1/[a2122h-1a_1-5]/1-1/a1-b1WURCSPDB2Glycan 1.1.0
[][a-D-Glcp]{[(1+1)][a-D-Glcp]{}}LINUCSPDB-CARE
#3: Polysaccharide
alpha-D-glucopyranose-(1-1)-alpha-D-glucopyranose


Type: oligosaccharide, Oligosaccharide / Class: Nutrient / Mass: 342.297 Da / Num. of mol.: 5
Source method: isolated from a genetically manipulated source
Details: oligosaccharide with reducing-end-to-reducing-end glycosidic bond
References: trehalose
DescriptorTypeProgram
DGlcpa1-1DGlcpaGlycam Condensed SequenceGMML 1.0
WURCS=2.0/1,2,1/[a2122h-1a_1-5]/1-1/a1-b1WURCSPDB2Glycan 1.1.0
[][a-D-Glcp]{[(1+1)][b-D-Glcp]{}}LINUCSPDB-CARE
#4: Sugar
ChemComp-GLC / alpha-D-glucopyranose / alpha-D-glucose / D-glucose / glucose


Type: D-saccharide, alpha linking / Mass: 180.156 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Formula: C6H12O6
IdentifierTypeProgram
DGlcpaCONDENSED IUPAC CARBOHYDRATE SYMBOLGMML 1.0
a-D-glucopyranoseCOMMON NAMEGMML 1.0
a-D-GlcpIUPAC CARBOHYDRATE SYMBOLPDB-CARE 1.0
GlcSNFG CARBOHYDRATE SYMBOLGMML 1.0
#5: Sugar ChemComp-BGC / beta-D-glucopyranose / beta-D-glucose / D-glucose / glucose


Type: D-saccharide, beta linking / Mass: 180.156 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Formula: C6H12O6
IdentifierTypeProgram
DGlcpbCONDENSED IUPAC CARBOHYDRATE SYMBOLGMML 1.0
b-D-glucopyranoseCOMMON NAMEGMML 1.0
b-D-GlcpIUPAC CARBOHYDRATE SYMBOLPDB-CARE 1.0
GlcSNFG CARBOHYDRATE SYMBOLGMML 1.0

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Details

Has protein modificationY

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Experimental details

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Experiment

ExperimentMethod: X-RAY DIFFRACTION / Number of used crystals: 1

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Sample preparation

CrystalDensity Matthews: 2.62 Å3/Da / Density % sol: 53.1 %
Crystal grow
*PLUS
Temperature: 22.5-23.5 ℃ / pH: 8.5 / Method: vapor diffusion, hanging drop
Components of the solutions
*PLUS
IDConc.Common nameCrystal-IDSol-ID
130 mg/mlprotein1drop
250 mMADA1drop
350 mMTris-HCl1drop
420 %(w/v)PEG15001drop
50.1 %(w/v)trehalose1drop
650 mMTris-HCl1reservoir
736 %(w/v)PEG15001reservoir

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Data collection

DiffractionMean temperature: 287 K
Diffraction sourceSource: SYNCHROTRON / Site: Photon Factory / Beamline: BL-6A / Wavelength: 1
DetectorType: FUJI / Detector: IMAGE PLATE / Date: Jun 24, 1994
RadiationMonochromatic (M) / Laue (L): M / Scattering type: x-ray
Radiation wavelengthWavelength: 1 Å / Relative weight: 1
ReflectionResolution: 2.19→84 Å / Num. obs: 8537 / % possible obs: 91.6 % / Observed criterion σ(I): 3 / Redundancy: 7.9 % / Rmerge(I) obs: 0.073
Reflection shellResolution: 2.19→2.29 Å / % possible all: 73.2
Reflection shell
*PLUS
% possible obs: 73.2 %

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Processing

Software
NameVersionClassification
WEISdata collection
WEISdata reduction
X-PLOR3.1model building
X-PLOR3.1refinement
WEISdata scaling
X-PLOR3.1phasing
RefinementMethod to determine structure: MOLECULAR REPLACEMENT
Starting model: ECOTIN PART OF ECOTIN-TRYPSIN COMPLEX

Resolution: 2.19→6 Å / σ(F): 2
RfactorNum. reflection% reflection
Rfree0.319 -10 %
Rwork0.213 --
obs0.213 8017 92.3 %
Displacement parametersBiso mean: 36 Å2
Refinement stepCycle: LAST / Resolution: 2.19→6 Å
ProteinNucleic acidLigandSolventTotal
Num. atoms1130 0 359 80 1569
Refine LS restraints
Refine-IDTypeDev ideal
X-RAY DIFFRACTIONx_bond_d0.009
X-RAY DIFFRACTIONx_bond_d_na
X-RAY DIFFRACTIONx_bond_d_prot
X-RAY DIFFRACTIONx_angle_d
X-RAY DIFFRACTIONx_angle_d_na
X-RAY DIFFRACTIONx_angle_d_prot
X-RAY DIFFRACTIONx_angle_deg1.68
X-RAY DIFFRACTIONx_angle_deg_na
X-RAY DIFFRACTIONx_angle_deg_prot
X-RAY DIFFRACTIONx_dihedral_angle_d26.67
X-RAY DIFFRACTIONx_dihedral_angle_d_na
X-RAY DIFFRACTIONx_dihedral_angle_d_prot
X-RAY DIFFRACTIONx_improper_angle_d1.52
X-RAY DIFFRACTIONx_improper_angle_d_na
X-RAY DIFFRACTIONx_improper_angle_d_prot
X-RAY DIFFRACTIONx_mcbond_it
X-RAY DIFFRACTIONx_mcangle_it
X-RAY DIFFRACTIONx_scbond_it
X-RAY DIFFRACTIONx_scangle_it
Software
*PLUS
Name: X-PLOR / Version: 3.1 / Classification: refinement
Refine LS restraints
*PLUS
Refine-IDTypeDev ideal
X-RAY DIFFRACTIONx_dihedral_angle_d
X-RAY DIFFRACTIONx_dihedral_angle_deg26.67
X-RAY DIFFRACTIONx_improper_angle_d
X-RAY DIFFRACTIONx_improper_angle_deg1.52

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