Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Ligand Interaction | Predict Membrane 

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 63.19 kDa 
• Atom Count: 4513 
• Modelled Residue Count: 528 
• Deposited Residue Count: 539 
• Unique protein chains: 1

4ZE1

Saccharomyces cerevisiae CYP51 Y140F mutant complexed with posaconazole in the active site

• PDB DOI: 10.2210/pdb4ZE1/pdb

• Classification: oxidoreductase/oxidoreductase inhibitor
• Organism(s): Saccharomyces cerevisiae YJM789
• Expression System: Saccharomyces cerevisiae
• Mutation(s): Yes 
• Membrane Protein: Yes  MemProtMD


• Deposited: 2015-04-20 Released: 2016-03-30 
• Deposition Author(s): Sagatova, A., Keniya, M.V., Wilson, R., Tyndall, J.D.A., Monk, B.C.
• Funding Organization(s): Health Research Council (HRC), Marsden Fund

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.05 Å
• R-Value Free: 0.243 
• R-Value Work: 0.203 
• R-Value Observed: 0.205 

Literature

Triazole resistance mediated by mutations of a conserved active site tyrosine in fungal lanosterol 14 alpha-demethylase.

Sagatova, A.A., Keniya, M.V., Wilson, R.K., Sabherwal, M., Tyndall, J.D., Monk, B.C.

(2016) Sci Rep 6: 26213-26213

• PubMed: 27188873 
• DOI: 10.1038/srep26213
• Primary Citation of Related Structures:  
  4ZDY, 4ZDZ, 4ZE0, 4ZE1, 4ZE2, 4ZE3, 5HS1


• PubMed Abstract: 
  

Emergence of fungal strains showing resistance to triazole drugs can make treatment of fungal disease problematic. Triazole resistance can arise due to single mutations in the drug target lanosterol 14α-demethylase (Erg11p/CYP51). We have determined how commonly occurring single site mutations in pathogenic fungi affect triazole binding using Saccharomyces cerevisiae Erg11p (ScErg11p) as a target surrogate. The mutations Y140F/H were introduced into full-length hexahistidine-tagged ScErg11p. Phenotypes and high-resolution X-ray crystal structures were determined for the mutant enzymes complexed with short-tailed (fluconazole and voriconazole) or long-tailed (itraconazole and posaconazole) triazoles and wild type enzyme complexed with voriconazole. The mutations disrupted a water-mediated hydrogen bond network involved in binding of short-tailed triazoles, which contain a tertiary hydroxyl not present in long-tailed triazoles. This appears to be the mechanism by which resistance to these short chain azoles occurs. Understanding how these mutations affect drug affinity will aid the design of azoles that overcome resistance.

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Related Citations: 

• Architecture of a single membrane spanning cytochrome P450 suggests constraints that orient the catalytic domain relative to a bilayer.
  Monk, B.C., Tomasiak, T.M., Keniya, M.V., Huschmann, F.U., Tyndall, J.D., O'Connell, J.D., Cannon, R.D., McDonald, J.G., Rodriguez, A., Finer-Moore, J.S., Stroud, R.M.
  (2014) Proc Natl Acad Sci U S A 111: 3865

• Structural insights into binding of the antifungal drug fluconazole to Saccharomyces cerevisiae lanosterol 14alpha-demethylase
  Sagatova, A., Keniya, M.V., Wilson, R.K., Monk, B.C., Tyndall, J.D.
  () To be published --: --

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Organizational Affiliation: 

Department of Oral Sciences, University of Otago, Dunedin, New Zealand.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Lanosterol 14-alpha demethylase	A	539	Saccharomyces cerevisiae YJM789	Mutation(s): 1  Gene Names: ERG11, SCY_2394 Membrane Entity: Yes
UniProt
Find proteins for A6ZSR0 (Saccharomyces cerevisiae (strain YJM789)) Explore A6ZSR0  Go to UniProtKB:  A6ZSR0

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
X2N	C [auth A]	POSACONAZOLE C37 H42 F2 N8 O4 RAGOYPUPXAKGKH-XAKZXMRKSA-N
HEM	B [auth A]	PROTOPORPHYRIN IX CONTAINING FE C34 H32 Fe N4 O4 KABFMIBPWCXCRK-RGGAHWMASA-L

Binding Affinity Annotations
ID	Source	Binding Affinity
X2N	Binding MOAD:  4ZE1	Kd: 150 (nM) from 1 assay(s)

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.05 Å
• R-Value Free: 0.243 
• R-Value Work: 0.203 
• R-Value Observed: 0.205 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 78.79	α = 90
b = 67.75	β = 99.43
c = 81.06	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
Blu-Ice	data collection
Aimless	data scaling
PHENIX	phasing
MOSFLM	data reduction

Structure Validation

Entry History & Funding Information

Deposition Data

• Deposited Date: 2015-04-20 
• Released Date: 2016-03-30 
Deposition Author(s): Sagatova, A., Keniya, M.V., Wilson, R., Tyndall, J.D.A., Monk, B.C.

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Funding Organization	Location	Grant Number
Health Research Council (HRC)	New Zealand	--
Marsden Fund	New Zealand	--

Revision History  

• Version 1.0: 2016-03-30
  Type: Initial release
  
• Version 1.1: 2016-06-01
  Changes: Database references
• Version 1.2: 2016-12-21
  Changes: Non-polymer description, Structure summary
• Version 1.3: 2017-08-09
  Changes: Data collection, Database references
• Version 1.4: 2017-11-22
  Changes: Refinement description
• Version 1.5: 2020-01-01
  Changes: Author supporting evidence