H. Kondo et al., ESCHERICHIA-COLI POSITIVE REGULATOR OMPR HAS A LARGE LOOP STRUCTURE AT THE PUTATIVE RNA-POLYMERASE INTERACTION SITE, Nature structural biology, 4(1), 1997, pp. 28-31
The C-terminal DNA-binding domain of OmpR, a positive regulator involv
ed in osmoregulation expression of the ompF and ompC genes in Escheric
hia coli, has a helix-turn-helix variant motif. The 'turn' region, con
sisting of 11 residues, forms an RNA polymerase contact site.