Crystal structure of BPSS1823, a Mip-like chaperone from Burkholderia pseudomallei

Experimental Data Snapshot

  • Resolution: 0.91 Å
  • R-Value Free: 0.116 
  • R-Value Work: 0.109 
  • R-Value Observed: 0.110 

Starting Models: experimental
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The Structure of a Burkholderia Pseudomallei Immunophilin-Inhibitor Complex Reveals New Approaches to Antimicrobial Development

Norville, I.H.O'Shea, K.Sarkar-Tyson, M.Zheng, S.Titball, R.W.Varani, G.Harmer, N.J.

(2011) Biochem J 437: 413

  • DOI: https://doi.org/10.1042/BJ20110345
  • Primary Citation of Related Structures:  
    2KE0, 2KO7, 2Y78

  • PubMed Abstract: 

    Mips (macrophage infectivity potentiators) are a subset of immunophilins associated with virulence in a range of micro-organisms. These proteins possess peptidylprolyl isomerase activity and are inhibited by drugs including rapamycin and tacrolimus. We determined the structure of the Mip homologue [BpML1 (Burkholderia pseudomallei Mip-like protein 1)] from the human pathogen and biowarfare threat B. pseudomallei by NMR and X-ray crystallography. The crystal structure suggests that key catalytic residues in the BpML1 active site have unexpected conformational flexibility consistent with a role in catalysis. The structure further revealed BpML1 binding to a helical peptide, in a manner resembling the physiological interaction of human TGFβRI (transforming growth factor β receptor I) with the human immunophilin FKBP12 (FK506-binding protein 12). Furthermore, the structure of BpML1 bound to the class inhibitor cycloheximide N-ethylethanoate showed that this inhibitor mimics such a helical peptide, in contrast with the extended prolyl-peptide mimicking shown by inhibitors such as tacrolimus. We suggest that Mips, and potentially other bacterial immunophilins, participate in protein-protein interactions in addition to their peptidylprolyl isomerase activity, and that some roles of Mip proteins in virulence are independent of their peptidylprolyl isomerase activity.

  • Organizational Affiliation

    School of Biosciences, University of Exeter, Geoffrey Pope Building, Stocker Road, Exeter EX4 4QD, UK.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
PEPTIDYL-PROLYL CIS-TRANS ISOMERASE133Burkholderia pseudomallei K96243Mutation(s): 0 
Find proteins for Q63J95 (Burkholderia pseudomallei (strain K96243))
Explore Q63J95 
Go to UniProtKB:  Q63J95
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ63J95
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 0.91 Å
  • R-Value Free: 0.116 
  • R-Value Work: 0.109 
  • R-Value Observed: 0.110 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 54.677α = 90
b = 54.677β = 90
c = 119.172γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-05-25
    Type: Initial release
  • Version 1.1: 2011-07-27
    Changes: Database references, Version format compliance
  • Version 1.2: 2011-08-03
    Changes: Derived calculations
  • Version 2.0: 2023-12-20
    Changes: Atomic model, Data collection, Database references, Derived calculations, Other, Refinement description