5ESH

Saccharomyces cerevisiae CYP51 (Lanosterol 14-alpha demethylase) G73W mutant in complex with itraconazole


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.15 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.183 
  • R-Value Observed: 0.185 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.4 of the entry. See complete history


Literature

Impact of Homologous Resistance Mutations from Pathogenic Yeast on Saccharomyces cerevisiae Lanosterol 14 alpha-Demethylase.

Sagatova, A.A.Keniya, M.V.Tyndall, J.D.A.Monk, B.C.

(2018) Antimicrob Agents Chemother 62

  • DOI: https://doi.org/10.1128/AAC.02242-17
  • Primary Citation of Related Structures:  
    5ESE, 5ESF, 5ESG, 5ESH, 5ESI, 5ESJ, 5ESK

  • PubMed Abstract: 

    Fungal infections frequently affect immunodeficient individuals and are estimated to kill 1.35 million people per annum. Azole antifungals target the membrane-bound cytochrome P450 monooxygenase lanosterol 14α-demethylase (CYP51; Erg11p). Mutations in CYP51 can render the widely used triazole drugs less effective. The Candida albicans CYP51 mutation G464S and the double mutation Y132F G464S (Y140F and G464S by Saccharomyces cerevisiae numbering) as well as the CYP51A G54E/R/W mutations of Aspergillus fumigatus (G73E/R/W by S. cerevisiae numbering) have been reproduced in a recombinant C-terminal hexahistidine-tagged version of S. cerevisiae CYP51 (ScErg11p6×His). Phenotypes and X-ray crystal structures were determined for the mutant enzymes. Liquid microdilution assays showed that the G464S mutation in ScErg11p6×His conferred no difference in the susceptibility of yeast to triazole drugs but in combination with the Y140F mutation gave a 4-fold reduction in susceptibility to the short-tailed triazole fluconazole. The ScErg11p6×His Y140F G464S mutant was unstable during purification and was not crystallized. The ScErg11p6×His G73E/R/W mutations conferred increased susceptibly to all triazoles tested in liquid microdilution assays. High-resolution X-ray crystal structures reveal two different conformations of the ligand itraconazole, including a previously unseen conformation, as well as interactions between the tail of this triazole and the E/W73 residue. This study shows that S. cerevisiae CYP51 adequately represents some but not all mutations in CYP51s of pathogenic fungi. Insight into the molecular mechanisms of resistance mutations in CYP51 will assist the development of inhibitors that will overcome antifungal resistance.


  • Organizational Affiliation

    Sir John Walsh Research Institute, University of Otago, Dunedin, New Zealand alia.sagatova@otago.ac.nz.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Lanosterol 14-alpha demethylase539Saccharomyces cerevisiae YJM789Mutation(s): 1 
Gene Names: ERG11SCY_2394
EC: 1.14.13.70
Membrane Entity: Yes 
UniProt
Find proteins for A6ZSR0 (Saccharomyces cerevisiae (strain YJM789))
Explore A6ZSR0 
Go to UniProtKB:  A6ZSR0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA6ZSR0
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
1YN
Query on 1YN

Download Ideal Coordinates CCD File 
C [auth A]2-[(2R)-butan-2-yl]-4-{4-[4-(4-{[(2R,4S)-2-(2,4-dichlorophenyl)-2-(1H-1,2,4-triazol-1-ylmethyl)-1,3-dioxolan-4-yl]methoxy}phenyl)piperazin-1-yl]phenyl}-2,4-dihydro-3H-1,2,4-triazol-3-one
C35 H38 Cl2 N8 O4
VHVPQPYKVGDNFY-DFMJLFEVSA-N
HEM
Query on HEM

Download Ideal Coordinates CCD File 
B [auth A]PROTOPORPHYRIN IX CONTAINING FE
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.15 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.183 
  • R-Value Observed: 0.185 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 77.56α = 90
b = 66.85β = 98.34
c = 80.88γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
Aimlessdata scaling
Blu-Icedata collection
PHENIXphasing
iMOSFLMdata reduction

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Health Research Council (HRC)New Zealand--
Marsden FundNew Zealand--

Revision History  (Full details and data files)

  • Version 1.0: 2016-11-23
    Type: Initial release
  • Version 1.1: 2017-09-20
    Changes: Data collection, Refinement description
  • Version 1.2: 2020-01-01
    Changes: Author supporting evidence
  • Version 1.3: 2021-09-01
    Changes: Database references
  • Version 1.4: 2023-09-27
    Changes: Data collection, Refinement description