C-H...O and C-H...N interactions in RNA structures

被引：71

作者：

Brandl, M ^{[1
]}

Lindauer, K ^{[1
]}

Meyer, M ^{[1
]}

Sühnel, J ^{[1
]}

机构：

[1] Inst Mol Biotechnol, D-07708 Jena, Germany

来源：

THEORETICAL CHEMISTRY ACCOUNTS | 1999年 / 101卷 / 1-3期

关键词：

RNA structure; C-H...X interactions; hydrogen bonds; statistical analysis;

D O I：

10.1007/s002140050415

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Small molecule studies indicate that C-H...X interactions (X: O,N) constitute weak H-bonds. We have performed a comprehensive analysis of their occurrence and geometry in RNA structures. Here, we report on statistical properties of the total set of interactions identified and discuss selected motifs. The distance/angle distribution of all interactions exhibits an excluded region where the allowed C--H...X angle range increases with an increasing H...X distance. The preferred short C--H...X interactions in RNA are backbone-backbone contacts between neighbour nucleotides. Distance/angle distributions generated for various interaction types can be used for error recognition and modelling. The axial C2'(H)...O4' and C5'(H)...O2' interactions connect two backbone segments and form a seven-membered ring that is specific for RNA. An AA base pair with one standard H-bond and one C-H...N interaction has been identified in various structures. Despite the occurrence of short C--H...X contacts their free energy contribution to RNA stability remains to be assessed.

引用

页码：103 / 113

页数：11

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[1] How accurately and precisely can RNA structure be determined by NMR? [J].