Solvent-stable cholesterol oxidase

Experimental Data Snapshot

  • Resolution: 1.54 Å
  • R-Value Free: 0.196 
  • R-Value Work: 0.176 
  • R-Value Observed: 0.176 

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This is version 2.1 of the entry. See complete history


Structural characterization of the organic solvent-stable cholesterol oxidase from Chromobacterium sp. DS-1.

Sagermann, M.Ohtaki, A.Newton, K.Doukyu, N.

(2010) J Struct Biol 170: 32-40

  • DOI: https://doi.org/10.1016/j.jsb.2010.01.012
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Cholesterol oxidase is of significant commercial interest as it is widely used as a biosensor for the detection of cholesterol in clinical samples, blood serum and food. Increased stability of this enzyme with regards to temperature and different solvent conditions are of great importance to the reliability and versatility of its applications. We here report the crystal structure of the cholesterol oxidase of Chromobacterium sp. DS-1 (CHOLOX). In contrast to other previously characterized cholesterol oxidases, this enzyme retains high activity in organic solvents and detergents at temperatures above 85 degrees C despite its mesophilic origin. With the availability of one other homologous oxidase of known three-dimensional structure, a detailed comparison of its sequence and structure was performed to elucidate the mechanisms of stabilization. In contrast to factors that typically contribute to the stability of thermophilic proteins, the structure of CHOLOX exhibits a larger overall cavity volume, less charged residues and less salt bridge interactions. Moreover, the vast majority of residue substitutions were found on or near the protein's solvent exposed surface. We propose that the engineering of enhanced stability may also be accomplished through selective engineering of the protein periphery rather than by redesigning its entire core.

  • Organizational Affiliation

    Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA 93106-9510, USA. Sagermann@chem.ucsb.edu

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Cholesterol oxidase540Chromobacterium sp. DS-1Mutation(s): 0 
Gene Names: cho
Find proteins for B5MGF8 (Chromobacterium sp. DS-1)
Explore B5MGF8 
Go to UniProtKB:  B5MGF8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupB5MGF8
Sequence Annotations
  • Reference Sequence


Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
Glycosylation Resources
GlyTouCan:  G05551OP
GlyCosmos:  G05551OP
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on FAD

Download Ideal Coordinates CCD File 
C27 H33 N9 O15 P2
Biologically Interesting Molecules (External Reference) 1 Unique
Experimental Data & Validation

Experimental Data

  • Resolution: 1.54 Å
  • R-Value Free: 0.196 
  • R-Value Work: 0.176 
  • R-Value Observed: 0.176 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 62.227α = 90
b = 90.38β = 90
c = 124.198γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
XDSdata reduction
XSCALEdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-02-09
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Non-polymer description, Structure summary
  • Version 2.1: 2023-09-06
    Changes: Data collection, Database references, Refinement description, Structure summary