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首页> 外文期刊>Journal of Biomolecular Structure and Dynamics >Effect of selective substitution of 5-bromocytosine on conformation of DNA triple helices.
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Effect of selective substitution of 5-bromocytosine on conformation of DNA triple helices.

机译:5-溴胞嘧啶的选择性取代对DNA三重螺旋构象的影响。

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摘要

Three triplex DNAs containing 5-bromocytosine[BrC] were studied by vibrational spectroscopy and molecular modelling. Firstly, three oligodeoxypyrimidines of 5'-(TC)3-T4-(BrCT)3 [CBrC], 5'-(TBrC)3-T4-(CT)3 [BrCC] and 5'-(TBrC)3-T4-(BrCT)3 [BrCBrC] were synthesized and then reacted with an oligodeoxypurine of 5'-(AG)3 at pH=4.5 in phosphate buffer respectively to form three comparative hairpin triplex named CY,YC and YY. The results of FT-Raman and IR revealed that YY is almost in A-like form, CY and YC are combinations of A-like form and B-like form, but A-form dominates in CY while B-form is equivalent as A-form in YC. The result is consistent with the theoretical analysis.
机译:通过振动光谱和分子模拟研究了三个含有5-溴胞嘧啶[BrC]的三链体DNA。首先,三个5'-(TC)3-T4-(BrCT)3 [CBrC],5'-(TBrC)3-T4-(CT)3 [BrCC]和5'-(TBrC)3-T4的寡脱氧嘧啶合成-(BrCT)3 [BrCBrC],然后在磷酸盐缓冲液中与pH'= 4.5的5'-(AG)3寡脱氧嘌呤反应,分别形成三个比较的发夹三元体CY,YC和YY。 FT-Raman和IR的结果表明,YY几乎是A样形式,CY和YC是A样形式和B样形式的组合,但CY中A形式占优势,而B形式与A相当。 -YC中的表格。结果与理论分析相符。

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