Principles of ER cotranslational translocation revealed by proximity-specific ribosome profiling.

Principles of ER cotranslational translocation revealed by proximity-specific ribosome profiling.
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DOI:
10.1126/science.1257521
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发表时间:
2014-11-07
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Weissman JS
Weissman JS
中科院分区:
其他
文献类型:
--
作者:
Jan CH;Williams CC;Weissman JS

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Localized protein synthesis is a fundamental mechanism for creating distinct subcellular environments. Here we developed a generalizable proximity-specific ribosome profiling strategy that enables global analysis of translation in defined subcellular locations. We applied this approach to the endoplasmic reticulum (ER) in yeast and mammals. We observed the large majority of secretory proteins to be cotranslationally translocated, including substrates capable of post-translational insertion in vitro. Distinct translocon complexes engaged nascent chains at different points during synthesis. Whereas most proteins engaged the ER immediately after or even before signal sequence (SS) emergence, a class of Sec66-dependent proteins entered with a looped SS conformation. Finally, we observed rapid ribosome exchange into the cytosol after translation termination. These data provide insights into how distinct translocation mechanisms act in concert to promote efficient cotranslational recruitment.
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