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RESEARCH COMMUNICATION

Translation of the poly(A) tail plays crucial roles in nonstop mRNA surveillance via translation repression and protein destabilization by proteasome in yeast

¹ Department of Molecular Biology, Graduate School of Science, Nagoya University, Chikusa-ku, Nagoya 464-8602, Japan; ² Precursory Research for Embryonic Science and Technolgy (PRESTO), Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan

mRNA surveillance system represses the expression of nonstop mRNA by rapid mRNA degradation and translation repression. Here we show that the level of protein product of nonstop mRNA containing a poly(A) tail was reduced 100-fold, and this reduction was due to rapid mRNA degradation, translation repression, and protein destabilization, at least in part, by the proteasome. Insertion of a poly(A) tract upstream of a termination codon resulted in translation repression and protein destabilization, but not rapid mRNA decay. We propose that translation of the poly(A) tail plays crucial roles in nonstop mRNA surveillance via translation repression and protein destabilization.

[Keywords: Nonstop mRNA; polylysine; translational repression; poly(A); proteasome]

Received September 5, 2006; revised version accepted January 22, 2007.

E-MAIL p47294a{at}nucc.cc.nagoya-u.ac.jp; FAX 81-52-789-3001.

Article is online at http://www.genesdev.org/cgi/doi/10.1101/gad.1490207

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