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- W1991994251 abstract "Melting experiments were conducted on 22 DNA dumbbells as a function of solvent ionic strength from 25-115 mM Na(+). The dumbbell molecules have short duplex regions comprised of 16-20 base pairs linked on both ends by T(4) single-strand loops. Only the 4-8 central base pairs of the dumbbell stems differ for different molecules, and the six base pairs on both sides of the central sequence and adjoining loops on both ends are the same in every molecule. Results of melting analysis on the 22 new DNA dumbbells are combined with our previous results on 17 other DNA dumbbells, with stem lengths containing from 14-18 base pairs, reported in the first article of this series (Doktycz, Goldstein, Paner, Gallo, and Benight, Biopoly 32, 1992, 849-864). The combination of results comprises a database of optical melting parameters for 39 DNA dumbbells in ionic strengths from 25-115 mM Na(+). This database is employed to evaluate the thermodynamics of singlet, doublet, and triplet sequence-dependent interactions in duplex DNA. Analysis of the 25 mM Na(+) data reveals the existence of significant sequence-dependent triplet or next-nearest-neighbor interactions. The enthalpy of these interactions is evaluated for all possible triplets. Some of the triplet enthalpy values are less than the uncertainty in their evaluation, indicating no measurable interaction for that particular sequence. This finding suggests that the thermodynamic stability of duplex DNA depends on solvent ionic strength in a sequence-dependent manner. As a part of the analysis, the nearest-neighbor (base pair doublet) interactions in 55, 85, and 115 mM Na(+) are also reevaluated from the larger database." @default.
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- W1991994251 date "1999-01-01" @default.
- W1991994251 modified "2023-10-10" @default.
- W1991994251 title "Studies of DNA dumbbells VII: Evaluation of the next-nearest-neighbor sequence-dependent interactions in duplex DNA" @default.
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- W1991994251 doi "https://doi.org/10.1002/(sici)1097-0282(1999)52:1<29::aid-bip2>3.0.co;2-k" @default.
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