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Nat Rev Microbiol. 2007 Sep;5(9):710-20. doi: 10.1038/nrmicro1717.

Ribbon-helix-helix transcription factors: variations on a theme.

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Department of Chemistry and Protein Research Center, University of Puerto Rico at Rio Piedras, San Juan, Puerto Rico 00931, Puerto Rico.


The ribbon-helix-helix (RHH) superfamily of transcription factors uses a conserved three-dimensional structural motif to bind to DNA in a sequence-specific manner. This functionally diverse protein superfamily regulates the transcription of genes that are involved in the uptake of metals, amino-acid biosynthesis, cell division, the control of plasmid copy number, the lytic cycle of bacteriophages and, perhaps, many other cellular processes. In this Analysis, the structures of different RHH transcription factors are compared in order to evaluate the sequence motifs that are required for RHH-domain folding and DNA binding, as well as to identify conserved protein-DNA interactions in this superfamily.

[Indexed for MEDLINE]

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