Decoding in the absence of a codon by tmRNA and SmpB in the ribosome.
Decoding in the absence of a codon by tmRNA and SmpB in the ribosome.
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DOI:
10.1126/science.1217039
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发表时间:
2012-03-16
期刊:
影响因子:
--
通讯作者:
Ramakrishnan V
中科院分区:
文献类型:
--
作者:
Neubauer C;Gillet R;Kelley AC;Ramakrishnan V
In bacteria, ribosomes stalled at the end of truncated messages are rescued by tmRNA, a bifunctional molecule that acts as both a tRNA and mRNA, and SmpB, a small protein that works in concert with tmRNA. Here we present the crystal structure at 3.2 Å resolution of a tmRNA fragment, SmpB and elongation factor Tu bound to the ribosome. The structure shows how SmpB plays the role of both the anticodon loop of tRNA and portions of mRNA to facilitate decoding in the absence of an mRNA codon in the A site of the ribosome, and explains why the tmRNA-SmpB system does not interfere with normal translation.
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