5J6E

Structure of disulfide crosslinked A. fumigatus FKBP12(V91C)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.216 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structures of Pathogenic Fungal FKBP12s Reveal Possible Self-Catalysis Function.

Tonthat, N.K.Juvvadi, P.R.Zhang, H.Lee, S.C.Venters, R.Spicer, L.Steinbach, W.J.Heitman, J.Schumacher, M.A.

(2016) mBio 7: e00492-e00416

  • DOI: https://doi.org/10.1128/mBio.00492-16
  • Primary Citation of Related Structures:  
    5HT1, 5HTG, 5HUA, 5HW6, 5HW7, 5HW8, 5HWB, 5HWC, 5I98, 5J6E

  • PubMed Abstract: 

    Invasive fungal infections remain difficult to treat and require novel targeting strategies. The 12-kDa FK506-binding protein (FKBP12) is a ubiquitously expressed peptidyl-prolyl isomerase with considerable homology between fungal pathogens and is thus a prime candidate for future targeting efforts to generate a panfungal strategy. Despite decades of research on FKBPs, their substrates and mechanisms of action remain unclear. Here we describe structural, biochemical, and in vivo analyses of FKBP12s from the pathogenic fungi Candida albicans, Candida glabrata, and Aspergillus fumigatus Strikingly, multiple apo A. fumigatus and C. albicans FKBP12 crystal structures revealed a symmetric, intermolecular interaction involving the deep insertion of an active-site loop proline into the active-site pocket of an adjacent subunit. Such interactions have not been observed in previous FKBP structures. This finding indicates the possibility that this is a self-substrate interaction unique to the A. fumigatus and C. albicans fungal proteins that contain this central proline. Structures obtained with the proline in the cis and trans states provide more data in support of self-catalysis. Moreover, cysteine cross-linking experiments captured the interacting dimer, supporting the idea that it forms in solution. Finally, genetic studies exploring the impact of mutations altering the central proline and an adjacent residue provide evidence that any dimeric state formed in vivo, where FKBP12 concentrations are low, is transient. Taken together, these findings suggest a unique mechanism of self-substrate regulation by fungal FKBP12s, lending further novel understanding of this protein for future drug-targeting efforts.


  • Organizational Affiliation

    Department of Biochemistry, Duke University School of Medicine, Durham, North Carolina, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
FK506-binding protein 1A
A, B
111Aspergillus fumigatus Af293Mutation(s): 1 
Gene Names: fpr1AAFUA_6G12170
EC: 5.2.1.8
UniProt
Find proteins for Q4WLV6 (Aspergillus fumigatus (strain ATCC MYA-4609 / CBS 101355 / FGSC A1100 / Af293))
Explore Q4WLV6 
Go to UniProtKB:  Q4WLV6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ4WLV6
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.216 
  • Space Group: P 65
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 136.887α = 90
b = 136.887β = 90
c = 33.037γ = 120
Software Package:
Software NamePurpose
SCALAdata scaling
MOLREPphasing
PHENIXrefinement
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-09-14
    Type: Initial release
  • Version 1.1: 2017-05-24
    Changes: Data collection, Structure summary
  • Version 1.2: 2017-11-22
    Changes: Refinement description