1RH1

crystal structure of the cytotoxic bacterial protein colicin B at 2.5 A resolution


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.197 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structure of the cytotoxic bacterial protein colicin B at 2.5 A resolution

Hilsenbeck, J.L.Park, H.Chen, G.Youn, B.Postle, K.Kang, C.

(2004) Mol.Microbiol. 51: 711-720


  • PubMed Abstract: 
  • Colicin B (55 kDa) is a cytotoxic protein that recognizes the outer membrane transporter, FepA, as a receptor and, after gaining access to the cytoplasmic membranes of sensitive Escherichia coli cells, forms a pore that depletes the electrochemical p ...

    Colicin B (55 kDa) is a cytotoxic protein that recognizes the outer membrane transporter, FepA, as a receptor and, after gaining access to the cytoplasmic membranes of sensitive Escherichia coli cells, forms a pore that depletes the electrochemical potential of the membrane and ultimately results in cell death. To begin to understand the series of dynamic conformational changes that must occur as colicin B translocates from outer membrane to cytoplasmic membrane, we report here the crystal structure of colicin B at 2.5 A resolution. The crystal belongs to the space group C2221 with unit cell dimensions a = 132.162 A, b = 138.167 A, c = 106.16 A. The overall structure of colicin B is dumbbell shaped. Unlike colicin Ia, the only other TonB-dependent colicin crystallized to date, colicin B does not have clearly structurally delineated receptor-binding and translocation domains. Instead, the unique N-terminal lobe of the dumbbell contains both domains and consists of a large (290 residues), mostly beta-stranded structure with two short alpha-helices. This is followed by a single long ( approximately 74 A) helix that connects the N-terminal domain to the C-terminal pore-forming domain, which is composed of 10 alpha-helices arranged in a bundle-type structure, similar to the pore-forming domains of other colicins. The TonB box sequence at the N-terminus folds back to interact with the N-terminal lobe of the dumbbell and leaves the flanking sequences highly disordered. Comparison of sequences among many colicins has allowed the identification of a putative receptor-binding domain.


    Organizational Affiliation

    Department of Chemistry and School of Molecular Biosciences, Washington State University, Pullman, WA 99164, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Colicin B
A
511Escherichia coliMutation(s): 0 
Gene Names: cba
Find proteins for P05819 (Escherichia coli)
Go to UniProtKB:  P05819
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.197 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 132.162α = 90.00
b = 138.167β = 90.00
c = 106.160γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data collection
HKL-2000data reduction
X-PLORrefinement
SOLVEphasing
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-03-09
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance