Download MendeleyStructure of the Apo Form of the Catabolite Control Protein a (Ccpa) from Bacillus Megaterium with a DNA-Binding Domain.
Singh, R.K., Palm, G.J., Panjikar, S., Hinrichs, W.(2007) Acta Crystallogr Sect F Struct Biol Cryst Commun 63: 253
- PubMed: 17401189
- DOI: https://doi.org/10.1107/S1744309107008949
- Primary Citation of Related Structures:
2JCG - PubMed Abstract:
Crystal structure determination of catabolite control protein A (CcpA) at 2.6 A resolution reveals for the first time the structure of a full-length apo-form LacI-GalR family repressor protein. In the crystal structures of these transcription regulators, the three-helix bundle of the DNA-binding domain has only been observed in cognate DNA complexes; it has not been observed in other crystal structures owing to its mobility. In the crystal packing of apo-CcpA, the protein-protein contacts between the N-terminal three-helix bundle and the core domain consisted of interactions between the homodimers that were similar to those between the corepressor protein HPr and the CcpA N-subdomain in the ternary DNA complex. In contrast to the DNA complex, the apo-CcpA structure reveals large subdomain movements in the core, resulting in a complete loss of contacts between the N-subdomains of the homodimer.
Organizational Affiliation:
Institut für Biochemie, Universität Greifswald, Felix-Hausdorff-Strasse 4, D-17489 Greifswald, Germany.
