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Deciphering the protein-DNA code of bacterial winged helix-turn-helix transcription factors |
Adam P. Joyce1, James J. Havranek2( ) |
1. Program in Developmental, Regenerative, and Stem Cell Biology, Washington University in St. Louis, St. Louis, MO 63110, USA 2. Department of Biochemistry and Molecular Biophysics, Washington University in St. Louis, St. Louis, MO 63110, USA |
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Abstract Background: Sequence-specific binding by transcription factors (TFs) plays a significant role in the selection and regulation of target genes. At the protein:DNA interface, amino acid side-chains construct a diverse physicochemical network of specific and non-specific interactions, and seemingly subtle changes in amino acid identity at certain positions may dramatically impact TF:DNA binding. Variation of these specificity-determining residues (SDRs) is a major mechanism of functional divergence between TFs with strong structural or sequence homology. Methods: In this study, we employed a combination of high-throughput specificity profiling by SELEX and Spec-seq, structural modeling, and evolutionary analysis to probe the binding preferences of winged helix-turn-helix TFs belonging to the OmpR sub-family in Escherichia coli. Results: We found that E. coli OmpR paralogs recognize tandem, variably spaced repeats composed of “GT-A” or “GCT”-containing half-sites. Some divergent sequence preferences observed within the “GT-A” mode correlate with amino acid similarity; conversely, “GCT”-based motifs were observed for a subset of paralogs with low sequence homology. Direct specificity profiling of a subset of OmpR homologues (CpxR, RstA, and OmpR) as well as predicted “SDR-swap” variants revealed that individual SDRs may impact sequence preferences locally through direct contact with DNA bases or distally via the DNA backbone. Conclusions: Overall, our work provides evidence for a common structural “code” for sequence-specific wHTH-DNA interactions, and demonstrates that surprisingly modest residue changes can enable recognition of highly divergent sequence motifs. Further examination of SDR predictions will likely reveal additional mechanisms controlling the evolutionary divergence of this important class of transcriptional regulators.
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Keywords
transcription factor
SELEX
winged helix-turn-helix
specificity determinants
two-component signaling
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Corresponding Author(s):
James J. Havranek
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Online First Date: 26 February 2018
Issue Date: 08 March 2018
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