1UMQ: solution structure and DNA binding of the effector domain from the global regulator PrrA(RegA) from R. sphaeroides: Insights into DNA binding specificity

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.
PDB ID: 1UMQDownload
MMDB ID: 25520
PDB Deposition Date: 2003/8/28
Updated in MMDB: 2003/12
Experimental Method:
solution nmr
Source Organism:
Similar Structures:
Biological Unit for 1UMQ: monomeric; determined by author
Molecular Components in 1UMQ
Label Count Molecule
Protein (1 molecule)
Photosynthetic Apparatus Regulatory Protein(Gene symbol: prrA)
Molecule annotation
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Citing MMDB