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Science 29 November 1996:
Vol. 274. no. 5292, pp. 1511 - 1514
DOI: 10.1126/science.274.5292.1511

Reports

Essential Yeast Protein with Unexpected Similarity to Subunits of Mammalian Cleavage and Polyadenylation Specificity Factor (CPSF)

Guillaume Chanfreau, * Suzanne M. Noble, * Christine Guthrie dagger

The 3' ends of most eukaryotic messenger RNAs are generated by internal cleavage and polyadenylation. In mammals, there is a strict dependence of both reactions on the sequence AAUAAA, which occurs upstream of polyadenylation [poly(A)] sites and which is recognized by CPSF. In contrast, cis-acting signals for yeast 3'-end generation are highly divergent from those of mammals, suggesting that trans-acting factors other than poly(A) polymerase would not be conserved. The essential yeast protein Brr5/Ysh1 shows sequence similarity to subunits of mammalian CPSF and is required for 3'-end processing in vivo and in vitro. These results demonstrate a structural and functional conservation of the yeast and mammalian 3'-end processing machineries despite a lack of conservation of the cis sequences.

Department of Biochemistry and Biophysics, UCSF School of Medicine, San Francisco, CA 94143-0448. E-mail: guthrie{at}cgl.ucsf.edu
*   Contributed equally to this work.

dagger    To whom correspondence should be addressed.


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Science. ISSN 0036-8075 (print), 1095-9203 (online)