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Published online September 17, 2007
doi:10.1083/jcb.200701165
The Journal of Cell Biology, Vol. 178, No. 7, 1133-1143
The Rockefeller University Press, 0021-9525 $30.00
© 2007 Lotan et al.
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Article

 The Rpb7p subunit of yeast RNA polymerase II plays roles in the two major cytoplasmic mRNA decay mechanisms

Rona Lotan, Vicky Goler-Baron, Lea Duek, Gal Haimovich, and Mordechai Choder

Department of Molecular Microbiology, Rappaport Faculty of Medicine, Technion – Israel Institute of Technology, Haifa 31096, Israel

Correspondence to Mordecai Choder: choder{at}technion.ac.il

The steady-state level of mRNAs is determined by the balance between their synthesis by RNA polymerase II (Pol II) and their decay. In the cytoplasm, mRNAs are degraded by two major pathways; one requires decapping and 5' to 3' exonuclease activity and the other involves 3' to 5' degradation. Rpb7p is a Pol II subunit that shuttles between the nucleus and the cytoplasm. Here, we show that Rpb7p is involved in the two mRNA decay pathways and possibly couples them. Rpb7p stimulates the deadenylation stage required for execution of both pathways. Additionally, Rpb7p is both an active component of the P bodies, where decapping and 5' to 3' degradation occur, and is capable of affecting the P bodies function. Moreover, Rpb7p interacts with the decapping regulator Pat1p in a manner important for the mRNA decay machinery. Rpb7p is also involved in the second pathway, as it stimulates 3' to 5' degradation. Our genetic analyses suggest that Rpb7p plays two distinct roles in mRNA decay, which can both be uncoupled from Rpb7p's role in transcription. Thus, Rpb7p plays pivotal roles in determining mRNA levels.

R. Lotan and V. Goler-Baron contributed equally to this paper.

Abbreviations used in this paper: HS, heat shock; mRNP, mRNA-proteins complex; PB, processing body; PBF, protein biosynthetic factor; Pol II, RNA polymerase II; ts, temperature sensitive; WT, wild type.


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