Biological Assembly 1  

 3D View: Structure | Ligand Interaction

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Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 55847.32 
• Atom Count: 4360 
• Residue Count: 504 
• Unique protein chains: 1

1N4V

ATOMIC RESOLUTION STRUCTURE OF CHOLESTEROL OXIDASE @pH 5.8 (STREPTOMYCES SP. SA-COO)

• DOI: 10.2210/pdb1N4V/pdb

• Classification: OXIDOREDUCTASE
• Organism(s): Streptomyces sp. (strain SA-COO)
• Expression System: Escherichia coli


• Deposited: 2002-11-01 Released: 2004-04-27 
• Deposition Author(s): Vrielink, A., Lario, P.I.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1 Å
• R-Value Free: 0.147 
• R-Value Work: 0.119 

Literature

Atomic resolution crystallography reveals how changes in pH shape the protein microenvironment

Lyubimov, A.Y., Lario, P.I., Moustafa, I., Vrielink, A.

(2006) Nat.Chem.Biol. 2: 259-264

• PubMed: 16604066 
• DOI: 10.1038/nchembio784
• Primary Citation of Related Structures:  
  2GEW, 1N4W, 1N4U
• Also Cited By: 1MXT


• PubMed Abstract: 
  

Hydrogen atoms are a vital component of enzyme structure and function. In recent years, atomic resolution crystallography (>or=1.2 A) has been successfully used to investigate the role of the hydrogen atom in enzymatic catalysis. Here, atomic resolution crystallography was used to study the effect of pH on cholesterol oxidase from Streptomyces sp., a flavoenzyme oxidoreductase. Crystallographic observations of the anionic oxidized flavin cofactor at basic pH are consistent with the UV-visible absorption profile of the enzyme and readily explain the reversible pH-dependent loss of oxidation activity. Furthermore, a hydrogen atom, positioned at an unusually short distance from the main chain carbonyl oxygen of Met122 at high pH, was observed, suggesting a previously unknown mechanism of cofactor stabilization. This study shows how a redox active site responds to changes in the enzyme's environment and how these changes are able to influence the mechanism of enzymatic catalysis.

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Organizational Affiliation: 

Department of Molecular, Cell and Developmental Biology, 1156 High Street, University of California, Santa Cruz, California 95064, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Cholesterol oxidase	A	504	Streptomyces sp. (strain SA-COO)	Mutation(s): 0  Gene Names: choA EC: 1.1.3.6
Find proteins for P12676 (Streptomyces sp. (strain SA-COO)) Go to UniProtKB:  P12676

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
FAD	A	FLAVIN-ADENINE DINUCLEOTIDE C27 H33 N9 O15 P2 VWWQXMAJTJZDQX-UYBVJOGSSA-N
GOL	A	GLYCEROL GLYCERIN; PROPANE-1,2,3-TRIOL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1 Å
• R-Value Free: 0.147 
• R-Value Work: 0.119 
• Space Group: P 1 2₁ 1

Unit Cell:

Length (Å)	Angle (°)
a = 51.354	α = 90.00
b = 73.291	β = 105.10
c = 63.171	γ = 90.00

Software Package:

Software Name	Purpose
SCALEPACK	data scaling
DENZO	data reduction
SHELXL-97	refinement
SHELX	model building
SHELX	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2002-11-01 
• Released Date: 2004-04-27 
• Deposition Author(s): Vrielink, A., Lario, P.I.

Revision History 

• Version 1.0: 2004-04-27
  Type: Initial release
• Version 1.1: 2008-04-28
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Source and taxonomy, Version format compliance