2W7N

Crystal Structure of KorA Bound to Operator DNA: Insight into Repressor Cooperation in RP4 Gene Regulation

Summary for 2W7N

• Entry DOI: 10.2210/pdb2w7n/pdb
• Descriptor: TRFB TRANSCRIPTIONAL REPRESSOR PROTEIN, 5'-D(*AP*AP*TP*GP*TP*TP*TP*AP*GP*CP *TP*AP*AP*AP*CP*AP*AP*G)-3', 5'-D(*CP*BRUP*BRUP*GP*TP*TP*TP*AP*GP*CP*TP*AP *AP*AP*CP*AP*BRUP*T)-3', ... (4 entities in total)
• Functional Keywords: incp, plasmid, repressor, dna-binding, transcription/dna, protein-dna complex, transcription factor, helix-turn-helix motif, transcription regulation, transcription-dna complex
• Biological source: ESCHERICHIA COLI; More
• Total number of polymer chains: 6
• Total formula weight: 45093.47

Authors

Koenig, B.,Mueller, J.J.,Lanka, E.,Heinemann, U. (deposition date: 2008-12-23, release date: 2009-02-17, Last modification date: 2024-05-08)

Primary citation

Koenig, B.,Mueller, J.J.,Lanka, E.,Heinemann, U.
Crystal Structure of Kora Bound to Operator DNA: Insight Into Repressor Cooperation in Rp4 Gene Regulation
Nucleic Acids Res., 37:1915-, 2009

PubMed Abstract: KorA is a global repressor in RP4 which regulates cooperatively the expression of plasmid genes whose products are involved in replication, conjugative transfer and stable inheritance. The structure of KorA bound to an 18-bp DNA duplex that contains the symmetric operator sequence and incorporates 5-bromo-deoxyuridine nucleosides has been determined by multiple-wavelength anomalous diffraction phasing at 1.96-A resolution. KorA is present as a symmetric dimer and contacts DNA via a helix-turn-helix motif. Each half-site of the symmetric operator DNA binds one copy of the protein in the major groove. As confirmed by mutagenesis, recognition specificity is based on two KorA side chains forming hydrogen bonds to four bases within each operator half-site. KorA has a unique dimerization module shared by the RP4 proteins TrbA and KlcB. We propose that these proteins cooperate with the global RP4 repressor KorB in a similar manner via this dimerization module and thus regulate RP4 inheritance.

PubMed: 19190096
DOI: 10.1093/NAR/GKP044

Experimental method

X-RAY DIFFRACTION (1.85 Å)