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• W2901181181 endingPage "157" @default.
• W2901181181 startingPage "149" @default.
• W2901181181 abstract "PA1 (dIm-PyPyβPyPyPy-γ-PyPyβPyPyPyPyβ-Ta) is a large (14-ring) hairpin polyamide that was designed to recognize the DNA sequence 5'-W2GW7-3', where W is either A or T. As is common among the smaller 6-8-ring hairpin polyamides (PAs), it binds its target recognition sequence with low nM affinity. However, in addition to its large size, it is distinct from these more extensively characterized PAs in its high tolerance for mismatches and antiviral properties. In ongoing attempts to understand the basis for these distinctions, we conducted thermodynamics studies of PA1-DNA interactions. The temperature dependence of binding affinity was measured using TAMRA-labeled hairpin DNAs containing a single target sequence. PA1 binding to either an ATAT/TATA or an AAAA/TTTT pattern is consistently entropically driven. This is in contrast to the A/T pattern-dependent driving forces for DNA binding by netropsin, distamycin, and smaller hairpin polyamides. Analysis of the salt dependence of PA1-DNA binding reveals that within experimental error, there is no dependence on ionic strength, indicating that the polyelectrolyte effect does not contribute to PA1-DNA binding energetics. This is similar to that observed for smaller PAs. PA1-DNA recognition sequence binding stoichiometries were determined at both nM (fluorescence) and μM (circular dichroism) concentrations. With all sequences and under both conditions, multiple PA1 molecules bind the small DNA hairpin that contains only a single recognition sequence. Implications for these observations are discussed." @default.
• W2901181181 created "2018-11-29" @default.
• W2901181181 creator A5006351586 @default.
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• W2901181181 date "2019-02-01" @default.
• W2901181181 modified "2023-09-25" @default.
• W2901181181 title "Thermodynamics and site stoichiometry of DNA binding by a large antiviral hairpin polyamide" @default.
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• W2901181181 doi "https://doi.org/10.1016/j.biochi.2018.11.013" @default.
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• W2901181181 hasPublicationYear "2019" @default.
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