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• W2086970742 abstract "We used a combination of spectroscopic and calorimetric techniques to determine complete thermodynamic profiles accompanying the folding of a set of triple helices and control duplexes. Specifically, we studied the sequences: d(A(7)C(5)T(7)C(5)T(7)), d(A(6)C(5)T(6)C(5)T(6)), d(A(6)C(5)T(6)), d(AGAGAGAC(5)TCTCTCTC(5)TCTCTCT), d(AGAGAC(5)TCTCTC(5)TCTCT), d(AGAGAC(5)TCTCTC(2)), d(AAGGAC(5)TCCTTC(5)TTCCT), d(AGGAAC(5)TTCCTC(5)TCCTT), and d(GAAAGC(5)CTTTCC(5)CTTTC). Circular dichroism spectroscopy indicated that all triplexes and duplexes are in the B conformation. DSC melting experiments revealed that the formation of triplexes is accompanied by a favorable free energy change, which arises from the compensation of a large and favorable enthalpic contribution with an unfavorable entropic contribution. Comparison of the thermodynamic profiles of these triplexes yielded enthalpic contributions of -24 kcal/mol, -23 kcal/mol, and -22 kcal/mol for the formation of TAT/TAT, TAT/CGC(+), and CGC(+)/CGC(+) base triplet stacks, respectively. UV melts as a function of sodium concentration show sodium ions stabilize the triplexes that contain only TAT triplets but destabilize the triplexes that contain CGC(+) triplets. UV melts as a function of pH indicate that the protonation of the third strand and loop cytosines stabilizes the triplexes that contain CGC(+) and TAT triplets, respectively. Our overall results suggest that the triplex to duplex transition of triplexes that contain CGC(+) triplets is accompanied by a release of protons and an uptake of sodium, while their duplex to random coil transition is accompanied by a release of sodium ions. A consequence of this opposite sodium dependence is that their coupled transitions are nearly independent of sodium concentration but are dependent on the experimental pH." @default.
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• W2086970742 date "2002-10-30" @default.
• W2086970742 modified "2023-10-03" @default.
• W2086970742 title "Energetic Contributions for the Formation of TAT/TAT, TAT/CGC⁺, and CGC⁺/CGC⁺ Base Triplet Stacks" @default.
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• W2086970742 doi "https://doi.org/10.1021/ja026952h" @default.
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