Structures of the bacterial ribosome in classical and hybrid states of tRNA binding.

Structures of the bacterial ribosome in classical and hybrid states of tRNA binding.
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DOI:
10.1126/science.1202692
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发表时间:
2011-05-20
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Cate JH
Cate JH
中科院分区:
其他
文献类型:
--
作者:
Dunkle JA;Wang L;Feldman MB;Pulk A;Chen VB;Kapral GJ;Noeske J;Richardson JS;Blanchard SC;Cate JH

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During protein synthesis, the ribosome controls the movement of transfer RNA (tRNA) and messenger RNA (mRNA) by means of large-scale structural rearrangements. We describe structures of the intact bacterial ribosome from Escherichia coli that reveal how the ribosome binds tRNA in two functionally distinct states, determined to a resolution of ~3.2 Å by x-ray crystallography. One state positions tRNA in the peptidyl-tRNA binding site. The second, a fully rotated state, is stabilized by ribosome recycling factor (RRF) and binds tRNA in a highly bent conformation in a hybrid peptidyl/exit (P/E) site. The structures help to explain how the ratchet-like motion of the two ribosomal subunits contributes to the mechanisms of translocation, termination, and ribosome recycling.
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