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Bacillus subtilis CodY protein is the best-studied member of a novel family of global transcriptional regulators found ubiquitously in low-G+C gram-positive bacteria. As for many DNA-binding proteins, CodY appears to have a helix-turn-helix (HTH) motif thought to be critical for interaction with DNA. This putative HTH motif was found to be highly conserved in the CodY homologs. Site-directed mutagenesis was used to identify amino acids within this motif that are important for DNA recognition and binding. The effects of each mutation on DNA binding in vitro and on the regulation of transcription in vivo from two target promoters were tested. Each of the mutations had similar effects on binding to the two promoters in vitro, but some mutations had differential effects in vivo.

A Region of Bacillus subtilis CodY Protein Required for Interaction with DNA