Structural and thermodynamic characterization of vibrio fischeri CCDBDe Jonge, N., Hohlweg, W., Garcia-Pino, A., Respondek, M., Buts, L., Haesaerts, S., Lah, J., Zangger, K., Loris, R.
(2010) J.Biol.Chem. 285: 5606-5613
- PubMed: 19959472
- DOI: 10.1074/jbc.M109.068429
- Primary Citation of Related Structures:
- PubMed Abstract:
- Purification and crystallization of Vibrio fischeri CcdB and its complexes with fragments of gyrase and CcdA
De Jonge, N.,Buts, L.,Vangelooven, J.,Mine, N.,Van Melderen, L.,Wyns, L.,Loris, R.
(2007) Acta Crystallogr.,Sect.F 63: 356
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, ...
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.
Structural Biology Brussels, and Department of Molecular and Cellular Interactions, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium.