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Reference: Abou Elela S and Ares M Jr (1998) Depletion of yeast RNase III blocks correct U2 3' end formation and results in polyadenylated but functional U2 snRNA. EMBO J 17(13):3738-46

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Abstract


Yeast U2 snRNA is transcribed by RNA polymerase II to generate a single non-polyadenylated transcript. A temperature-sensitive yeast strain carrying a disruption in RNT1, the gene encoding a homolog of RNase III, produces 3'-extended U2 that is polyadenylated. The U2 3'-flanking region contains a putative stem-loop that is recognized and cleaved at two sites by recombinant GST-Rnt1 protein in vitro. Removal of sequences comprising the stem-loop structure blocks cleavage in vitro and mimics the effects of Rnt1 depletion in vivo. Strains carrying a U2 gene lacking the Rnt1 cleavage site produce only polyadenylated U2 snRNA, and yet are not impaired in growth or splicing. The results suggest that eukaryotic RNase III may be a general factor in snRNA processing, and demonstrate that polyadenylation is not incompatible with snRNA function in yeast.

Reference Type
Journal Article | Research Support, Non-U.S. Gov't | Research Support, U.S. Gov't, P.H.S.
Authors
Abou Elela S, Ares M Jr
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