Primary role for endoplasmic reticulum-bound ribosomes in cellular translation identified by ribosome profiling.

Published

Journal Article

In eukaryotic cells, the spatial regulation of protein expression is frequently conferred through the coupling of mRNA localization and the local control of translation. mRNA localization to the endoplasmic reticulum (ER) is a prominent example of such regulation and serves a ubiquitous role in segregating the synthesis of secretory and integral membrane proteins to the ER. Recent genomic and biochemical studies have now expanded this view to suggest a more substantial role for the ER cellular protein synthesis. We have utilized cell fractionation and ribosome profiling to obtain a genomic survey of the subcellular organization of mRNA translation and report that ribosomal loading of mRNAs, a proxy for mRNA translation, is biased to the ER. Notably, ER-associated mRNAs encoding both cytosolic and topogenic signal-encoding proteins display similar ribosome loading densities, suggesting that ER-associated ribosomes serve a global role in mRNA translation. We propose that the partitioning of mRNAs and their translation between the cytosol and ER compartments may represent a novel mechanism for the post-transcriptional regulation of gene expression.

Full Text

Duke Authors

Cited Authors

  • Reid, DW; Nicchitta, CV

Published Date

  • February 17, 2012

Published In

Volume / Issue

  • 287 / 8

Start / End Page

  • 5518 - 5527

PubMed ID

  • 22199352

Pubmed Central ID

  • 22199352

Electronic International Standard Serial Number (EISSN)

  • 1083-351X

Digital Object Identifier (DOI)

  • 10.1074/jbc.M111.312280

Language

  • eng

Conference Location

  • United States