Second Helix-Turn-Helix DNA binding domain of the regulatory protein TioE
Putative helix-turn-helix (HTH) regulatory protein, TioE, and related proteins. TioE is part of the thiocoraline gene cluster, which is involved in the biosynthesis of the antitumor thiocoraline from the marine actinomycete, Micromonospora. These proteins share the N-terminal DNA binding domain with other transcription regulators of the MerR superfamily that promote transcription by reconfiguring the spacer between the -35 and -10 promoter elements. Proteins in this family are unique within the MerR superfamily in that they are composed of just two adjacent MerR-like N-terminal domains; this CD mainly contains the C-terminal or second repeat (rpt2) of these tandem MerR-like domain proteins.