Candida albicans Hsp90 nucleotide binding domain in complex with ADP

Experimental Data Snapshot

  • Resolution: 1.74 Å
  • R-Value Free: 0.190 
  • R-Value Work: 0.170 

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This is version 1.2 of the entry. See complete history


Structural basis for species-selective targeting of Hsp90 in a pathogenic fungus.

Whitesell, L.Robbins, N.Huang, D.S.McLellan, C.A.Shekhar-Guturja, T.LeBlanc, E.V.Nation, C.S.Hui, R.Hutchinson, A.Collins, C.Chatterjee, S.Trilles, R.Xie, J.L.Krysan, D.J.Lindquist, S.Porco Jr., J.A.Tatu, U.Brown, L.E.Pizarro, J.Cowen, L.E.

(2019) Nat Commun 10: 402-402

  • DOI: https://doi.org/10.1038/s41467-018-08248-w
  • Primary Citation of Related Structures:  
    6CJI, 6CJJ, 6CJL, 6CJP, 6CJR, 6CJS

  • PubMed Abstract: 

    New strategies are needed to counter the escalating threat posed by drug-resistant fungi. The molecular chaperone Hsp90 affords a promising target because it supports survival, virulence and drug-resistance across diverse pathogens. Inhibitors of human Hsp90 under development as anticancer therapeutics, however, exert host toxicities that preclude their use as antifungals. Seeking a route to species-selectivity, we investigate the nucleotide-binding domain (NBD) of Hsp90 from the most common human fungal pathogen, Candida albicans. Here we report structures for this NBD alone, in complex with ADP or in complex with known Hsp90 inhibitors. Encouraged by the conformational flexibility revealed by these structures, we synthesize an inhibitor with >25-fold binding-selectivity for fungal Hsp90 NBD. Comparing co-crystals occupied by this probe vs. anticancer Hsp90 inhibitors revealed major, previously unreported conformational rearrangements. These insights and our probe's species-selectivity in culture support the feasibility of targeting Hsp90 as a promising antifungal strategy.

  • Organizational Affiliation

    Department of Molecular Genetics, University of Toronto, Toronto, ON, M5G 1M1, Canada. leah.cowen@utoronto.ca.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Heat shock protein 90 homolog230Candida albicans SC5314Mutation(s): 0 
Gene Names: HSP90CAALFM_C702030WACaJ7.0234CaO19.13868CaO19.6515
Find proteins for P46598 (Candida albicans (strain SC5314 / ATCC MYA-2876))
Explore P46598 
Go to UniProtKB:  P46598
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP46598
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.74 Å
  • R-Value Free: 0.190 
  • R-Value Work: 0.170 
  • Space Group: P 43 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 74.088α = 90
b = 74.088β = 90
c = 107.873γ = 90
Software Package:
Software NamePurpose
HKL-3000data reduction
HKL-3000data scaling
Cootmodel building

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2019-01-30
    Type: Initial release
  • Version 1.1: 2019-02-13
    Changes: Data collection, Database references
  • Version 1.2: 2023-10-04
    Changes: Data collection, Database references, Derived calculations, Refinement description