An important 2′-OH group for an RNA-protein interaction

被引:31
作者
Hou, YM [1 ]
Zhang, XL
Holland, JA
Davis, DR
机构
[1] Thomas Jefferson Univ, Dept Biochem & Mol Pharmacol, Philadelphia, PA 19107 USA
[2] Univ Penn, Dept Chem, Philadelphia, PA 19104 USA
[3] Univ Utah, Dept Med Chem, Salt Lake City, UT 84112 USA
关键词
D O I
10.1093/nar/29.4.976
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
We have-investigated the role of 2'-OH groups in the specific interaction between the acceptor stem of Escherichia coli tRNA(Cys) and cysteine-tRNA synthetase,This interaction provides for the high aminoacylation specificity observed for cysteine-tRNA synthetase, A synthetic RNA microhelix that recapitulates the sequence of the acceptor stem was used as a substrate and variants containing systematic replacement of the 2'-OH by 2'-deoxy or 2'-O-methyl groups were tested. Except for position U73, all substitutions had little effect on aminoacylation, Interestingly; the deoxy substitution at position U73 had no:effect on aminoacylation, but the 2'-O-methyl substitution decreased aminoacylation by 10-fold and addition of the even bulkier 2'-O-propyl group decreased aminoacylation by another 2-fold. The lack of an effect by the deoxy substitution suggests that the hydrogen bonding potential of the 2'-OH at position U73 is unimportant for aminoacylation. The decrease in activity upon alkyl substitution suggests that the 2'-OH group instead provides a monitor of the steric environment during the RNA-synthetase interaction. The steric role was confirmed in the context of a reconstituted tRNA and is consistent with the observation that the U73 base is the single most important determinant for aminoacylation and therefore is a:site that is likely to be in close contact with cysteine-tRNA synthetase. A steric role is supported by an NMR-based structural model of the acceptor stem, together with biochemical studies of a closely related microhelix, This role suggests that the U73 binding site for cysteine-tRNA synthetase is sterically optimized to accommodate a 2'-OH group in the: backbone, but that the hydroxyl group itself is not:involved,in specific hydrogen bonding interactions.
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收藏
页码:976 / 985
页数:10
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