1X8V

Estriol-bound and ligand-free structures of sterol 14alpha-demethylase (CYP51)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.55 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.206 

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This is version 1.2 of the entry. See complete history


Literature

Estriol Bound and Ligand-free Structures of Sterol 14alpha-Demethylase.

Podust, L.M.Yermalitskaya, L.V.Lepesheva, G.I.Podust, V.N.Dalmasso, E.A.Waterman, M.R.

(2004) Structure 12: 1937-1945

  • DOI: 10.1016/j.str.2004.08.009
  • Primary Citation of Related Structures:  
    1X8V, 1H5Z

  • PubMed Abstract: 
  • Sterol 14alpha-demethylases (CYP51) are essential enzymes in sterol biosynthesis in eukaryotes and drug targets in antifungal therapy. Here, we report CYP51 structures in ligand-free and estriol bound forms. Using estriol as a probe, we determined orientation of the substrate in the active site, elucidated protein contacts with the invariant 3beta-hydroxy group of a sterol, and identified F78 as a key discriminator between 4alpha-methylated and 4alpha,beta-dimethylated substrates ...

    Sterol 14alpha-demethylases (CYP51) are essential enzymes in sterol biosynthesis in eukaryotes and drug targets in antifungal therapy. Here, we report CYP51 structures in ligand-free and estriol bound forms. Using estriol as a probe, we determined orientation of the substrate in the active site, elucidated protein contacts with the invariant 3beta-hydroxy group of a sterol, and identified F78 as a key discriminator between 4alpha-methylated and 4alpha,beta-dimethylated substrates. Analysis of CYP51 dynamics revealed that the C helix undergoes helix-coil transition upon binding and dissociation of a ligand. Loss of helical structure of the C helix in the ligand-free form results in an unprecedented opening of the substrate binding site. Upon binding of estriol, the BC loop loses contacts with molecular surface and tends to adopt a closed conformation. A mechanism for azole resistance in the yeast pathogen Candida albicans associated with mutations in the ERG11 gene encoding CYP51 is suggested based on CYP51 protein dynamics.


    Organizational Affiliation

    Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN 37232, USA. larissa.m.podust@vanderbilt.edu



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Cytochrome P450 51A455Mycobacterium tuberculosisMutation(s): 2 
Gene Names: cyp51
EC: 1.14.13.70 (PDB Primary Data), 1.14.14.154 (UniProt)
UniProt
Find proteins for P9WPP9 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WPP9 
Go to UniProtKB:  P9WPP9
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HEM (Subject of Investigation/LOI)
Query on HEM

Download Ideal Coordinates CCD File 
B [auth A]PROTOPORPHYRIN IX CONTAINING FE
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
 Ligand Interaction
ESL (Subject of Investigation/LOI)
Query on ESL

Download Ideal Coordinates CCD File 
C [auth A], D [auth A]ESTRIOL
C18 H24 O3
PROQIPRRNZUXQM-ZXXIGWHRSA-N
 Ligand Interaction
Binding Affinity Annotations 
IDSourceBinding Affinity
ESL Binding MOAD:  1X8V Kd: 1.00e+5 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.55 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.206 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 47.161α = 90
b = 84.522β = 90
c = 110.811γ = 90
Software Package:
Software NamePurpose
CNSrefinement
HKL-2000data reduction
SCALEPACKdata scaling
CNSphasing

Structure Validation

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Ligand Structure Quality Assessment  



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-11-23
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance