Crystal structure of E.coli FocB at 1.4 A resolution

Experimental Data Snapshot

  • Resolution: 1.40 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.197 

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Structure of FocB - a member of a family of transcription factors regulating fimbrial adhesin expression in uropathogenic Escherichia coli

Hultdin, U.W.Lindberg, S.Grundstrom, C.Huang, S.Uhlin, B.E.Sauer-Eriksson, A.E.

(2010) FEBS J 277: 3368-3381

  • DOI: https://doi.org/10.1111/j.1742-4658.2010.07742.x
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    In uropathogenic Escherichia coli, UPEC, different types of fimbriae are expressed to mediate interactions with host tissue. FocB belongs to the PapB family of transcription factors involved in the regulation of fimbriae gene clusters. Recent findings suggest that members from this family of proteins may form homomeric or heteromeric complexes and exert both positive and negative effects on the transcription of fimbriae genes. To elucidate the detailed function of FocB, we have determined its crystal structure at 1.4 A resolution. FocB is an all alpha-helical protein with a helix-turn-helix motif. Interestingly, conserved residues important for DNA-binding are located not in the postulated recognition helix of the motif, but in the preceding helix. Results from protein-DNA-binding studies suggest that FocB interacts with the minor groove of its cognate DNA target, which is indicative of a DNA interaction that is unusual for this motif. FocB crystallizes in the form of dimers. Packing interactions in the crystals give two plausible dimerization interfaces. Conserved residues, known to be important for protein oligomerization, are present at both interfaces, suggesting that both sites could play a role in a functional FocB protein.

  • Organizational Affiliation

    Department of Chemistry, Umeå University, Umeå, Sweden.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
FocB protein
A, B
111Escherichia coliMutation(s): 0 
Gene Names: focBsfaB
Find proteins for Q93K76 (Escherichia coli)
Explore Q93K76 
Go to UniProtKB:  Q93K76
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ93K76
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.40 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.197 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 47.39α = 90
b = 58.823β = 90
c = 65.84γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
XDSdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-08-04
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2024-03-20
    Changes: Data collection, Database references