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尿嘧啶核苷和核苷酸糖基扭转角的质子磁共振研究。

A proton magnetic resonance investigation of the glycosyl torsion angle of uracil nucleosides and nucleotides.

作者信息

Schleich T, Lusebrink T R, Cross B P, Johnson N P

出版信息

Nucleic Acids Res. 1975 Apr;2(4):459-67. doi: 10.1093/nar/2.4.459.

Abstract

The use of line-shape decomposition techniques permitted the small 5-bond (5-J51') and 4-bond (4-J61') proton-proton coupling constants of a series of uracil nucleosides and nucleotides to be determined accurately. From an analysis of these coupling constants we have determined that the uracil base is in a predominantly anti conformation in aqueous solution and the mean position is not substantially altered by phosphate substitution at the 2', 3', or 5' positions, by changing the furanose stereochemistry from a ribose to a deoxyribose or an arabinose, or by an increase in temperature of 43 degree C.

摘要

线形分解技术的应用使得一系列尿嘧啶核苷和核苷酸的小的5-键(5-J51')和4-键(4-J61')质子-质子耦合常数得以准确测定。通过对这些耦合常数的分析,我们确定尿嘧啶碱基在水溶液中主要处于反式构象,并且在2'、3'或5'位进行磷酸取代、将呋喃糖立体化学从核糖改变为脱氧核糖或阿拉伯糖,或温度升高43℃时,平均位置基本没有改变。

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本文引用的文献

5
Nucleosides. XLIV. Long-range proton-fluorine spin-spin coupling in 5-fluoropyrimidine nucleosides.
J Am Chem Soc. 1968 Jan 31;90(3):709-15. doi: 10.1021/ja01005a027.
9
Nuclear magnetic resonance determination of syn and anti conformations in pyrimidine nucleosides.
J Am Chem Soc. 1971 Jan 13;93(1):277-9. doi: 10.1021/ja00730a062.

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