3JRZ image
Entry Detail
PDB ID:
3JRZ
Keywords:
Title:
CcdBVfi-FormII-pH5.6
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2009-09-09
Release Date:
2009-12-01
Method Details:
Experimental Method:
Resolution:
1.70 Å
R-Value Free:
0.19
R-Value Work:
0.16
R-Value Observed:
0.16
Space Group:
C 1 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:CcdB
Chain IDs:A
Chain Length:105
Number of Molecules:1
Biological Source:Vibrio fischeri
Primary Citation
Structural and thermodynamic characterization of vibrio fischeri CCDB
J.Biol.Chem. 285 5606 5613 (2010)
PMID: 19959472 DOI: 10.1074/jbc.M109.068429

Abstact

CcdB(Vfi) from Vibrio fischeri is a member of the CcdB family of toxins that poison covalent gyrase-DNA complexes. In solution CcdB(Vfi) is a dimer that unfolds to the corresponding monomeric components in a two-state fashion. In the unfolded state, the monomer retains a partial secondary structure. This observation correlates well with the crystal and NMR structures of the protein, which show a dimer with a hydrophobic core crossing the dimer interface. In contrast to its F plasmid homologue, CcdB(Vfi) possesses a rigid dimer interface, and the apparent relative rotations of the two subunits are due to structural plasticity of the monomer. CcdB(Vfi) shows a number of non-conservative substitutions compared with the F plasmid protein in both the CcdA and the gyrase binding sites. Although variation in the CcdA interaction site likely determines toxin-antitoxin specificity, substitutions in the gyrase-interacting region may have more profound functional implications.

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