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Updated: Aug 30, 2026

DNA-affinity-purified Chip (DAP-chip) Method to Determine Gene Targets for Bacterial Two component Regulatory Systems
Published on: July 21, 2014
Solution structure and DNA binding of the effector domain from the global regulator PrrA (RegA) from Rhodobacter
Cédric Laguri1, Mary K Phillips-Jones, Michael P Williamson
1Department of Molecular Biology and Biotechnology, University of Sheffield, Firth Court, Western Bank, Sheffield S10 2UH, UK.
Abstract:
Prr/RegA response regulator is a global transcription regulator in purple bacteria Rhodobacter sphaeroides and Rhodobacter capsulatus, and is essential in controlling the metabolic changes between aerobic and anaerobic environments. We report here the structure determination by NMR of the C-terminal effector domain of PrrA, PrrAC. It forms a three-helix bundle containing a helix-turn-helix DNA binding motif. The fold is similar to FIS protein, but the domain architecture is different from previously characterised response regulator effector domains, as it is shorter than any characterised so far. Alignment of Prr/RegA DNA targets permitted a refinement of the consensus sequence, which contains two GCGNC inverted repeats with variable half-site spacings. NMR titrations of PrrAC with specific and non-specific DNA show which surfaces are involved in DNA binding and suggest residues important for binding specificity. A model of the PrrAC/DNA complex was constructed in which two PrrAC molecules are bound to DNA in a symmetrical manner.
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