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- W2791570688 abstract "Most functional transcription factor (TF) binding sites deviate from their 'consensus' recognition motif, although their sites and flanking sequences are often conserved across species. Here, we used single-molecule DNA unzipping with optical tweezers to study how Egr-1, a TF harboring three zinc fingers (ZF1, ZF2 and ZF3), is modulated by the sequence and context of its functional sites in the Lhb gene promoter. We find that both the core 9 bp bound to Egr-1 in each of the sites, and the base pairs flanking them, modulate the affinity and structure of the protein-DNA complex. The effect of the flanking sequences is asymmetric, with a stronger effect for the sequence flanking ZF3. Characterization of the dissociation time of Egr-1 revealed that a local, mechanical perturbation of the interactions of ZF3 destabilizes the complex more effectively than a perturbation of the ZF1 interactions. Our results reveal a novel role for ZF3 in the interaction of Egr-1 with other proteins and the DNA, providing insight on the regulation of Lhb and other genes by Egr-1. Moreover, our findings reveal the potential of small changes in DNA sequence to alter transcriptional regulation, and may shed light on the organization of regulatory elements at promoters." @default.
- W2791570688 created "2018-03-29" @default.
- W2791570688 creator A5001399556 @default.
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- W2791570688 date "2017-12-14" @default.
- W2791570688 modified "2023-09-25" @default.
- W2791570688 title "Single-molecule DNA unzipping reveals asymmetric modulation of a transcription factor by its binding site sequence and context" @default.
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- W2791570688 doi "https://doi.org/10.1093/nar/gkx1252" @default.
- W2791570688 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5815098" @default.
- W2791570688 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/29253225" @default.
- W2791570688 hasPublicationYear "2017" @default.
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