The C-terminal DNA-binding domain of OmpR, a positive regulator involved in osmoregulation expression of the ompF and ompC genes in Escherichia coli, has a helix-turn-helix variant motif. The ‘turn’ region, consisting of 11 residues, forms an RNA polymerase contact site.
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Kondo, H., Nakagawa, A., Nishihira, J. et al. Escherichia coli positive regulator OmpR has a large loop structure at the putative RNA polymerase interaction site. Nat Struct Mol Biol 4, 28–31 (1997). https://doi.org/10.1038/nsb0197-28
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DOI: https://doi.org/10.1038/nsb0197-28
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