| Literature DB >> 20227371 |
Yide Mei1, Jeongsik Yong, Hongtu Liu, Yigong Shi, Judy Meinkoth, Gideon Dreyfuss, Xiaolu Yang.
Abstract
The specific molecular events that characterize the intrinsic apoptosis pathway have been the subject of intense research due to the pathway's fundamental role in development, homeostasis, and cancer. This pathway is defined by the release of cytochrome c from mitochondria into the cytosol and subsequent binding of cytochrome c to the caspase activator Apaf-1. Here, we report that both mitochondrial and cytosolic transfer RNA (tRNA) bind to cytochrome c. This binding prevents cytochrome c interaction with Apaf-1, blocking Apaf-1 oligomerization and caspase activation. tRNA hydrolysis in living cells and cell lysates enhances apoptosis and caspase activation, whereas microinjection of tRNA into living cells blocks apoptosis. These findings suggest that tRNA, in addition to its well-established role in gene expression, may determine cellular responsiveness to apoptotic stimuli. (c) 2010 Elsevier Inc. All rights reserved.Entities:
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Year: 2010 PMID： 20227371 PMCID： PMC2851137 DOI： 10.1016/j.molcel.2010.01.023
Source DB: PubMed Journal: Mol Cell ISSN： 1097-2765 Impact factor: 17.970