Structure of a bacterial ribonuclease P holoenzyme in complex with tRNA.
Structure of a bacterial ribonuclease P holoenzyme in complex with tRNA.
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DOI:
10.1038/nature09516
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发表时间:
2010-12-09
期刊:
影响因子:
64.8
通讯作者:
Mondragón A
中科院分区:
文献类型:
--
作者:
Reiter NJ;Osterman A;Torres-Larios A;Swinger KK;Pan T;Mondragón A
Ribonuclease (RNase) P is the universal ribozyme responsible for 5′-end tRNA processing. We report the crystal structure of the Thermotoga maritima RNase P holoenzyme in complex with tRNAPhe. The 154 kDa complex consists of a large catalytic RNA (P RNA), a small protein cofactor, and mature tRNA. The structure shows that RNA-RNA recognition occurs through shape complementarity, specific intermolecular contacts, and base pairing interactions. Soaks with a pre-tRNA 5′ leader sequence with and without metal help identify the 5′ substrate path and potential catalytic metal ions. The protein binds on top of a universally conserved structural module in P RNA and interacts with the leader, but not with mature tRNA. The active site is composed of phosphate backbone moieties, a universally conserved uridine nucleobase, and at least two catalytically important metal ions. The active site structure and conserved RNase P/tRNA contacts suggest a universal mechanism of catalysis by RNase P.
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