2X5W

X-ray structure of Mycobacterium tuberculosis cytochrome P450 CYP125 in complex with substrate cholest-4-en-3-one


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.58 Å
  • R-Value Free: 0.196 
  • R-Value Work: 0.146 
  • R-Value Observed: 0.149 

Starting Model: experimental
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This is version 1.5 of the entry. See complete history


Literature

Mycobacterium Tuberculosis Cyp125A1, a Steroid C27 Monooxygenase that Detoxifies Intracellularly Generated Cholest-4-En-3-One.

Ouellet, H.Guan, S.Johnston, J.B.Chow, E.D.Kells, P.M.Burlingame, A.L.Cox, J.S.Podust, L.M.Ortiz de Montellano, P.R.

(2010) Mol Microbiol 77: 730

  • DOI: https://doi.org/10.1111/j.1365-2958.2010.07243.x
  • Primary Citation of Related Structures:  
    2X5W

  • PubMed Abstract: 

    The infectivity and persistence of Mycobacterium tuberculosis requires the utilization of host cell cholesterol. We have examined the specific role of cytochrome P450 CYP125A1 in the cholesterol degradation pathway using genetic, biochemical and high-resolution mass spectrometric approaches. The analysis of lipid profiles from cells grown on cholesterol revealed that CYP125A1 is required to incorporate the cholesterol side-chain carbon atoms into cellular lipids, as evidenced by an increase in the mass of the methyl-branched phthiocerol dimycocerosates. We observed that cholesterol-exposed cells lacking CYP125A1 accumulate cholest-4-en-3-one, suggesting that this is a physiological substrate for this enzyme. Reconstitution of enzymatic activity with spinach ferredoxin and ferredoxin reductase revealed that recombinant CYP125A1 indeed binds both cholest-4-en-3-one and cholesterol, efficiently hydroxylates both of them at C-27, and then further oxidizes 27-hydroxycholest-4-en-3-one to cholest-4-en-3-one-27-oic acid. We determined the X-ray structure of cholest-4-en-3-one-bound CYP125A1 at a resolution of 1.58 A. CYP125A1 is essential for growth of CDC1551 in media containing cholesterol or cholest-4-en-3-one. In its absence, the latter compound is toxic for both CDC1551 and H37Rv when added with glycerol as a second carbon source. CYP125A1 is a key enzyme in cholesterol metabolism and plays a crucial role in circumventing the deleterious effect of cholest-4-en-3-one.


  • Organizational Affiliation

    Department of Pharmaceutical Chemistry, University of California, San Francisco, CA 94158, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
PUTATIVE CYTOCHROME P450 125440Mycobacterium tuberculosis H37RvMutation(s): 0 
EC: 1.14 (PDB Primary Data), 1.14.15.29 (UniProt)
UniProt
Find proteins for P9WPP1 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WPP1 
Go to UniProtKB:  P9WPP1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP9WPP1
Sequence Annotations
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.58 Å
  • R-Value Free: 0.196 
  • R-Value Work: 0.146 
  • R-Value Observed: 0.149 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 73.666α = 90
b = 75.977β = 90
c = 79.592γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
MOLREPphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-06-16
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2018-02-07
    Changes: Database references, Source and taxonomy
  • Version 1.4: 2019-04-03
    Changes: Data collection, Experimental preparation
  • Version 1.5: 2023-12-20
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description