CONFORMATIONAL TRANSITIONS OF DUPLEX AND TRIPLER NUCLEIC-ACID HELICES - THERMODYNAMIC ANALYSIS OF EFFECTS OF SALT CONCENTRATION ON STABILITY USING PREFERENTIAL INTERACTION COEFFICIENTS

被引:97
作者
BOND, JP
ANDERSON, CF
RECORD, MT
机构
[1] UNIV WISCONSIN,DEPT BIOCHEM,MADISON,WI 53706
[2] UNIV WISCONSIN,DEPT CHEM,MADISON,WI 53706
关键词
D O I
10.1016/S0006-3495(94)80542-9
中图分类号
Q6 [生物物理学];
学科分类号
071011 ;
摘要
For order-disorder transitions of double- and triple-stranded nucleic acid helices, the midpoint temperatures T-m depend strongly on a(+/-), the mean ionic activity of uniunivalent salt. Experimental determinations of dT(m)/d In a(+/-) and of the enthalpy change (Delta H-0) accompanying the transition in excess salt permit evaluation of Delta Gamma, the stoichiometrically weighted combination of preferential interaction coefficients, each of which reflects thermodynamic effects of interactions of salt ions with a reactant or product of the conformational transition Delta Gamma = -(Delta H-0/2RT(m)(2))dT(m)/d In a(+/-) = Delta H-0/2R d(T-m(-1))/d In a(+/-).
引用
收藏
页码:825 / 836
页数:12
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