4NCD

Crystal Structure of Class 5 Fimbriae Chaperone CfaA

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.04 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.217 
  • R-Value Observed: 0.221 

wwPDB Validation   3D Report Full Report


This is version 1.0 of the entry. See complete history. 


Literature

Structure of CfaA Suggests a New Family of Chaperones Essential for Assembly of Class 5 Fimbriae.

Bao, R., Fordyce, A., Chen, Y.X., McVeigh, A., Savarino, S.J., Xia, D.

(2014) PLoS Pathog 10: e1004316-e1004316

  • DOI: 10.1371/journal.ppat.1004316
  • Primary Citation of Related Structures:  
    4NCD

  • PubMed Abstract: 

    • Adhesive pili on the surface of pathogenic bacteria comprise polymerized pilin subunits and are essential for initiation of infections. Pili assembled by the chaperone-usher pathway (CUP) require periplasmic chaperones that assist subunit folding, maintain their stability, and escort them to the site of bioassembly ...

    Adhesive pili on the surface of pathogenic bacteria comprise polymerized pilin subunits and are essential for initiation of infections. Pili assembled by the chaperone-usher pathway (CUP) require periplasmic chaperones that assist subunit folding, maintain their stability, and escort them to the site of bioassembly. Until now, CUP chaperones have been classified into two families, FGS and FGL, based on the short and long length of the subunit-interacting loops between its F1 and G1 β-strands, respectively. CfaA is the chaperone for assembly of colonization factor antigen I (CFA/I) pili of enterotoxigenic E. coli (ETEC), a cause of diarrhea in travelers and young children. Here, the crystal structure of CfaA along with sequence analyses reveals some unique structural and functional features, leading us to propose a separate family for CfaA and closely related chaperones. Phenotypic changes resulting from mutations in regions unique to this chaperone family provide insight into their function, consistent with involvement of these regions in interactions with cognate subunits and usher proteins during pilus assembly.

    Organizational Affiliation: 

    Laboratory of Cell Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland, United States of America.



Macromolecules
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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Gram-negative pili assembly chaperone, N-terminal domain proteinA246Escherichia coli P0301867.5Mutation(s): 0 
Gene Names: ECP03018675_4907
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.04 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.217 
  • R-Value Observed: 0.221 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 102.606α = 90
b = 28.582β = 118.89
c = 90.716γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
SHARPphasing
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

  • Deposited Date: 2013-10-24 
  • Released Date: 2014-08-27 
    • Deposition Author(s): Bao, R., Xia, D.

Revision History  (Full details and data files)

  • Version 1.0: 2014-08-27
    Type: Initial release