The ribosomal peptidyl transferase

被引:120
作者
Beringer, Malte [1 ]
Rodnina, Marina V. [1 ]
机构
[1] Univ Witten Herdecke, Inst Phys Biochem, D-58448 Witten, Germany
关键词
PEPTIDYLTRANSFERASE ACTIVE-SITE; SUBSTRATE-ASSISTED CATALYSIS; AMINOACYL-TRANSFER-RNA; BOND FORMATION; CRYSTAL-STRUCTURE; BASE-PAIR; STRUCTURAL INSIGHTS; PUROMYCIN REACTION; MECHANISM; INTERMEDIATE;
D O I
10.1016/j.molcel.2007.03.015
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
Peptide bond formation on the ribosome takes place in an active site composed of RNA. Recent progress of structural, biochemical, and computational approaches has provided a fairly detailed picture of the catalytic mechanism of the reaction. The ribosome accelerates peptide bond formation by lowering the activation entropy of the reaction due to positioning the two substrates, ordering water in the active site, and providing an electrostatic network that stabilizes the reaction intermediates. Proton transfer during the reaction appears to be promoted by a concerted proton shuttle mechanism that involves ribose hydroxyl groups on the tRNA substrate.
引用
收藏
页码:311 / 321
页数:11
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