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- W2023892154 abstract "Ultrabithorax (Ubx) and Deformed (Dfd) proteins of Drosophila melanogaster contain homeodomains (HD) that are structurally similar and recognize similar DNA sequences, despite functionally distinct genetic regulatory roles for Ubx and Dfd. We report in the present study that Ubx-HD binding to a single optimal target site displayed significantly increased affinity and higher salt concentration dependence at lower pH, while Dfd-HD binding to DNA was unaffected by pH. Results from studies of chimeric Ubx-Dfd homeodomains showed that the N- and C-terminal regions of the Ubx-HD are required for this pH dependence. The increase in binding affinity at lower pH was greater for the Ubx optimal binding site than for other DNA binding sites, indicating that subtle sequence alterations in DNA binding sites may influence pH-dependent behavior. These data demonstrate enhanced DNA binding affinity at lower pH for the Ubx-HD in vitro and suggest the potential for significant discrimination of DNA binding sites in vivo." @default.
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- W2023892154 date "1996-01-01" @default.
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- W2023892154 title "pH-Dependent Enhancement of DNA Binding by the Ultrabithorax Homeodomain" @default.
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- W2023892154 doi "https://doi.org/10.1021/bi9606049" @default.
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