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Type: Journal article
Title: Roles of the mammalian target of rapamycin, mTOR, in controlling ribosome biogenesis and protein synthesis
Author: Iadevaia, V.
Huo, Y.
Zhang, Z.
Foster, L.
Proud, C.
Citation: Biochemical Society Transactions, 2012; 40(1):168-172
Publisher: Portland Press
Issue Date: 2012
ISSN: 0300-5127
Statement of
Valentina Iadevaia, Yilin Huo, Ze Zhang, Leonard J. Foster and Christopher G. Proud
Abstract: mTORC1 (mammalian target of rapamycin complex 1) is controlled by diverse signals (e.g. hormones, growth factors, nutrients and cellular energy status) and regulates a range of processes including anabolic metabolism, cell growth and cell division. We have studied the impact of inhibiting mTOR on protein synthesis in human cells. Partial inhibition of mTORC1 by rapamycin has only a limited impact on protein synthesis, but inhibiting mTOR kinase activity causes much greater inhibition of protein synthesis. Using a pulsed stable-isotope-labelling technique, we show that the rapamycin and mTOR (mammalian target of rapamycin) kinase inhibitors have differential effects on the synthesis of specific proteins. In particular, the synthesis of proteins encoded by mRNAs that have a 5′-terminal pyrimidine tract is strongly inhibited by mTOR kinase inhibitors. Many of these mRNAs encode ribosomal proteins. mTORC1 also promotes the synthesis of rRNA, although the mechanisms involved remain to be clarified. We found that mTORC1 also regulates the processing of the precursors of rRNA. mTORC1 thus co-ordinates several steps in ribosome biogenesis.
Keywords: mammalian target of rapamycin (mTOR); mRNA; protein synthesis; rapamycin; ribosome biogenesis; translation factor
Rights: © The Authors
RMID: 0020128254
DOI: 10.1042/BST20110682
Appears in Collections:Molecular and Biomedical Science publications

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