This family consists of several KorB transcriptional repressor proteins. The korB gene is a major regulatory element in the replication and maintenance of broad host-range plasmid RK2. It negatively controls the replication gene trfA, the host-lethal determinants kilA and kilB, and the korA-korB operon [1]. This domain includes the DNA-binding HTH motif [2].

1: Nucleotide sequence of korB, a replication control gene of broad host-range plasmid RK2. Kornacki JA, Balderes PJ, Figurski DH; J Mol Biol 1987;198:211-222. PMID:3430606

2: Sequence-specific DNA binding determined by contacts outside the helix-turn-helix motif of the ParB homolog KorB. Khare D, Ziegelin G, Lanka E, Heinemann U; Nat Struct Mol Biol 2004;11:656-663. PMID:15170177