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A high-resolution structure of the DNA-binding domain of AhrC, the arginine repressor/activator protein from Bacillus subtilis

Research output: Contribution to journalArticlepeer-review

James A. Garnett, Simon Baumberg, Peter G. Stockley, Simon E.V. Phillips

Original languageEnglish
Pages (from-to)914-917
Number of pages4
JournalActa Crystallographica Section F: Structural Biology and Crystallization Communications
Issue number11
Published26 Nov 2007

King's Authors


In Bacillus subtilis the concentration of l-arginine is controlled by the transcriptional regulator AhrC, which interacts with 18 bp DNA operator sites called ARG boxes in the promoters of arginine biosynthetic and catabolic operons. AhrC is a 100 kDa homohexamer, with each subunit having two domains. The C-terminal domains form the core, mediating intersubunit interactions and binding of the co-repressor l-arginine, whilst the N-terminal domains contain a winged helix-turn-helix DNA-binding motif and are arranged around the periphery. The N-terminal domain of AhrC has been expressed, purified and characterized and it has been shown that the fragment still binds DNA operators as a recombinant monomer. The DNA-binding domain has also been crystallized and the crystal structure refined to 1.0 Å resolution is presented.

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