3VHJ

Crystal structure of the cytoplasmic domain of BfpC


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.217 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Structure of an Essential Type IV Pilus Biogenesis Protein Provides Insights into Pilus and Type II Secretion Systems

Yamagata, A.Milgotina, E.Scanlon, K.Craig, L.Tainer, J.A.Donnenberg, M.S.

(2012) J.Mol.Biol. 419: 110-124

  • DOI: 10.1016/j.jmb.2012.02.041

  • PubMed Abstract: 
  • Type IV pili (T4Ps) are long cell surface filaments, essential for microcolony formation, tissue adherence, motility, transformation, and virulence by human pathogens. The enteropathogenic Escherichia coli bundle-forming pilus is a prototypic T4P ass ...

    Type IV pili (T4Ps) are long cell surface filaments, essential for microcolony formation, tissue adherence, motility, transformation, and virulence by human pathogens. The enteropathogenic Escherichia coli bundle-forming pilus is a prototypic T4P assembled and powered by BfpD, a conserved GspE secretion superfamily ATPase held by inner-membrane proteins BfpC and BfpE, a GspF-family membrane protein. Although the T4P assembly machinery shares similarity with type II secretion (T2S) systems, the structural biochemistry of the T4P machine has been obscure. Here, we report the crystal structure of the two-domain BfpC cytoplasmic region (N-BfpC), responsible for binding to ATPase BfpD and membrane protein BfpE. The N-BfpC structure reveals a prominent central cleft between two α/β-domains. Despite negligible sequence similarity, N-BfpC resembles PilM, a cytoplasmic T4P biogenesis protein. Yet surprisingly, N-BfpC has far greater structural similarity to T2S component EpsL, with which it also shares virtually no sequence identity. The C-terminus of the cytoplasmic domain, which leads to the transmembrane segment not present in the crystal structure, exits N-BfpC at a positively charged surface that most likely interacts with the inner membrane, positioning its central cleft for interactions with other Bfp components. Point mutations in surface-exposed N-BfpC residues predicted to be critical for interactions among BfpC, BfpE, and BfpD disrupt pilus biogenesis without precluding interactions with BfpE and BfpD and without affecting BfpD ATPase activity. These results illuminate the relationships between T4P biogenesis and T2S systems, imply that subtle changes in component residue interactions can have profound effects on function and pathogenesis, and suggest that T4P systems may be disrupted by inhibitors that do not preclude component assembly.


    Organizational Affiliation

    Department of Molecular Biology, MB4, The Skaggs Institute for Chemical Biology, The Scripps Research Institute, La Jolla, CA 92037, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
BfpC
A
172Escherichia coli O127:H6 (strain E2348/69 / EPEC)Gene Names: bfpC
Find proteins for B7UTD4 (Escherichia coli O127:H6 (strain E2348/69 / EPEC))
Go to UniProtKB:  B7UTD4
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.217 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 42.837α = 90.00
b = 61.836β = 90.00
c = 78.271γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data collection
HKL-2000data reduction
HKL-2000data scaling
SOLVEphasing
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-05-23
    Type: Initial release