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

Experimental Data Snapshot

  • Resolution: 1.55 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.206 

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

  • 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. 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

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Cytochrome P450 51455Mycobacterium tuberculosisMutation(s): 2 
Gene Names: cyp51
Find proteins for P9WPP9 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WPP9 
Go to UniProtKB:  P9WPP9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP9WPP9
Sequence Annotations
  • Reference Sequence
Small Molecules
Binding Affinity Annotations 
IDSourceBinding Affinity
ESL Binding MOAD:  1X8V Kd: 1.00e+5 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • 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
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

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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
  • Version 1.3: 2021-10-20
    Changes: Database references, Derived calculations
  • Version 1.4: 2023-08-23
    Changes: Data collection, Refinement description