3SGQ

GLN 18 VARIANT OF TURKEY OVOMUCOID INHIBITOR THIRD DOMAIN COMPLEXED WITH STREPTOMYCES GRISEUS PROTEINASE B AT PH 10.7

• PDB DOI: https://doi.org/10.2210/pdb3SGQ/pdb

• Classification: HYDROLASE/HYDROLASE INHIBITOR
• Organism(s): Streptomyces griseus, Meleagris gallopavo
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 1999-03-25 Released: 2003-08-26 
• Deposition Author(s): Huang, K., Lu, W., Anderson, S., Laskowski Jr., M., James, M.N.G.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Work: 0.175 

Starting Model: experimental

Literature

Recruitment of a Buried K+ Ion to Stabilize the Negative Charge of Ionized P1 in the Hydrophobic Pocket: Crystal Structures of Glu18, Gln18, Asp18 and Asn18 Variants of Turkey Ovomucoid Inhibitor Third Domain Complexed with Streptomyces griseus Protease B at Various pH's

Huang, K., Lu, W., Anderson, S., Laskowski Jr., M., James, M.N.G.

To be published.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 24.35 kDa 
• Atom Count: 1,854 
• Modelled Residue Count: 236 
• Deposited Residue Count: 236 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Streptogrisin B	A [auth E]	185	Streptomyces griseus	Mutation(s): 0  EC: 3.4.21.81
UniProt
Find proteins for P00777 (Streptomyces griseus) Explore P00777  Go to UniProtKB:  P00777

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Ovomucoid	B [auth I]	51	Meleagris gallopavo	Mutation(s): 1
UniProt
Find proteins for P68390 (Meleagris gallopavo) Explore P68390  Go to UniProtKB:  P68390

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
PO4	C [auth E]	PHOSPHATE ION O4 P NBIIXXVUZAFLBC-UHFFFAOYSA-K

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Work: 0.175 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 45.35	α = 90
b = 54.65	β = 119.2
c = 45.62	γ = 90

Software Package:

Software Name	Purpose
TNT	refinement

Structure Validation

Entry History 

Deposition Data

• Released Date: 2003-08-26 
Deposition Author(s): Huang, K., Lu, W., Anderson, S., Laskowski Jr., M., James, M.N.G.

Revision History  

• Version 1.0: 2003-08-26
  Type: Initial release
  
• Version 1.1: 2007-10-16
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2017-02-01
  Changes: Database references
• Version 1.4: 2017-11-29
  Changes: Derived calculations
• Version 1.5: 2023-09-13
  Changes: Data collection, Database references, Derived calculations, Refinement description
• Version 1.6: 2024-10-16
  Changes: Structure summary