Crystal structure of sterol 14alpha-demethylase (CYP51) from Trypanosoma cruzi in complex with inhibitor fluconazole

Experimental Data Snapshot

  • Resolution: 2.85 Å
  • R-Value Free: 0.280 
  • R-Value Work: 0.227 
  • R-Value Observed: 0.229 

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Structural Insights into Inhibition of Sterol 14{alpha}-Demethylase in the Human Pathogen Trypanosoma cruzi.

Lepesheva, G.I.Hargrove, T.Y.Anderson, S.Kleshchenko, Y.Furtak, V.Wawrzak, Z.Villalta, F.Waterman, M.R.

(2010) J Biol Chem 285: 25582-25590

  • DOI: https://doi.org/10.1074/jbc.M110.133215
  • Primary Citation of Related Structures:  
    3K1O, 3KHM, 3KSW

  • PubMed Abstract: 

    Trypanosoma cruzi causes Chagas disease (American trypanosomiasis), which threatens the lives of millions of people and remains incurable in its chronic stage. The antifungal drug posaconazole that blocks sterol biosynthesis in the parasite is the only compound entering clinical trials for the chronic form of this infection. Crystal structures of the drug target enzyme, Trypanosoma cruzi sterol 14alpha-demethylase (CYP51), complexed with posaconazole, another antifungal agent fluconazole and an experimental inhibitor, (R)-4'-chloro-N-(1-(2,4-dichlorophenyl)-2-(1H-imid-azol-1-yl)ethyl)biphenyl-4-carboxamide (VNF), allow prediction of important chemical features that enhance the drug potencies. Combined with comparative analysis of inhibitor binding parameters, influence on the catalytic activity of the trypanosomal enzyme and its human counterpart, and their cellular effects at different stages of the Trypanosoma cruzi life cycle, the structural data provide a molecular background to CYP51 inhibition and azole resistance and enlighten the path for directed design of new, more potent and selective drugs to develop an efficient treatment for Chagas disease.

  • Organizational Affiliation

    Department of Biochemistry, School of Medicine, Vanderbilt University, Nashville, Tennessee 37232, USA. i.lepesheva@vanderbilt.edu

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Sterol 14 alpha-demethylase464Trypanosoma cruziMutation(s): 8 
Gene Names: CYP51
Find proteins for Q7Z1V1 (Trypanosoma cruzi (strain CL Brener))
Explore Q7Z1V1 
Go to UniProtKB:  Q7Z1V1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ7Z1V1
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on HEM

Download Ideal Coordinates CCD File 
C34 H32 Fe N4 O4
Query on TPF

Download Ideal Coordinates CCD File 
C [auth A]2-(2,4-DIFLUOROPHENYL)-1,3-DI(1H-1,2,4-TRIAZOL-1-YL)PROPAN-2-OL
C13 H12 F2 N6 O
Binding Affinity Annotations 
IDSourceBinding Affinity
TPF BindingDB:  3KHM Kd: min: 230, max: 340 (nM) from 2 assay(s)
IC50: 880 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 2.85 Å
  • R-Value Free: 0.280 
  • R-Value Work: 0.227 
  • R-Value Observed: 0.229 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 62.591α = 90
b = 62.591β = 90
c = 222.248γ = 120
Software Package:
Software NamePurpose
HKL-2000data collection
HKL-2000data reduction
HKL-2000data 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: 2009-11-10
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.2: 2021-10-13
    Changes: Database references, Derived calculations
  • Version 1.3: 2023-09-06
    Changes: Data collection, Refinement description