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Molecular and Cellular Biology, April 2006, p. 2716-2727, Vol. 26, No. 7
0270-7306/06/$08.00+0     doi:10.1128/MCB.26.7.2716-2727.2006

Translational Repression by RNA-Binding Protein TIAR{dagger}

Krystyna Mazan-Mamczarz, Ashish Lal, Jennifer L. Martindale, Tomoko Kawai, and Myriam Gorospe*

Laboratory of Cellular and Molecular Biology, National Institute on Aging-Intramural Research Program, National Institutes of Health, Baltimore, Maryland 21224

Received 2 December 2005/ Returned for modification 27 December 2005/ Accepted 3 January 2006

The RNA-binding protein TIAR has been proposed to inhibit protein synthesis transiently by promoting the formation of translationally silent stress granules. Here, we report the selective binding of TIAR to several mRNAs encoding translation factors such as eukaryotic initiation factor 4A (eIF4A) and eIF4E (translation initiation factors), eEF1B (a translation elongation factor), and c-Myc (which transcriptionally controls the expression of numerous translation regulatory proteins). TIAR bound the 3'-untranslated regions of these mRNAs and potently suppressed their translation, particularly in response to low levels of short-wavelength UV (UVC) irradiation. The UVC-imposed global inhibition of the cellular translation machinery was significantly relieved after silencing of TIAR expression. We propose that the TIAR-mediated inhibition of translation factor expression elicits a sustained repression of protein biosynthesis in cells responding to stress.

* Corresponding author. Mailing address: Box 12, LCMB, NIA-IRP, NIH, 5600 Nathan Shock Dr., Baltimore, MD 21224. Phone: (410) 558-8443. Fax: (410) 558-8386. E-mail: myriam-gorospe{at}nih.gov.

{dagger} Supplemental material for this article may be found at http://mcb.asm.org/.

Molecular and Cellular Biology, April 2006, p. 2716-2727, Vol. 26, No. 7
0022-538X/06/$08.00+0     doi:10.1128/MCB.26.7.2716-2727.2006




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