Spectroscopic studies on ethidium bromide binding to intramolecular parallel and antiparallel triple helices containing T*A:T and G*G:C triplets

被引：4
|
作者：
Gondeau, C [1 ]
Maurizot, JC [1 ]
Durand, M [1 ]
机构：
[1] Univ Orleans Lab, Ctr Biophys Mol, F-45071 Orleans 2, France
来源：
JOURNAL OF BIOMOLECULAR STRUCTURE & DYNAMICS | 2000年 / 17卷 / 05期
关键词：
D O I：
10.1080/07391102.2000.10506576
中图分类号：
Q5 [生物化学]; Q7 [分子生物学];
学科分类号：
071010 ; 081704 ;
摘要：
The interaction of ethidium bromide (EB), a DNA intercalator, with two intramolecular triplexes (5)'d(G(4)A(4)G(4)-[T-4]-C4T4C4-[T-4]-G(4)T(4)G(4)), (5)'d(G(4)T(4)G(4)-[T-4]-G(4)A(4)G(4)-[T-4]-C4T4C4) ([T-4] represents a stretch of 4 thymine residues) and their precursor duplexes has been investigated by circular dichroism, fluorescence and UV absorption spectroscopy. Binding of EB induces a circular dichroism band in the region around 310 nm which is positive for the duplex forms but negative for the tripler forms. We observed that the binding of EB to the duplex form does not induce the formation of the tripler structures. Thermal denaturation experiments demonstrate that EB stabilizes more the parallel triple helix than the antiparallel one. Analysis of the binding process from fluorescence measurements shows that binding constants to the triple helical forms and to the hairpin reference duplex [T-4]-G(4)A(4)G(4)-[T-4]-C4T4C4) are close. However the binding site size is larger for the triplexes (4-6 base triplets) than for the duplex (2 base pairs).
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页码：879 / 886
页数：8
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