Polyadenylation of RRNA in Saccharomyces Cerevisiae

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 2004 Jun 3

PMID 15173578

Citations 90

Authors

Letian Kuai

Feng Fang

J Scott Butler

Fred Sherman

Affiliations

Soon will be listed here.

Abstract

In contrast to mRNAs, rRNAs are transcribed by RNA polymerase I or III and are not believed to be polyadenylated. Here we show that in Saccharomyces cerevisiae, at least a small fraction of rRNAs do have a poly(A) tail. The levels of polyadenylated rRNAs are dramatically increased in strains lacking the degradation function of Rrp6p, a component of the nuclear exosome. Pap1p, the poly(A) polymerase, is responsible for adenylating the rRNAs despite the fact that the rRNAs do not have a canonical polyadenylation signal. Polyadenylated rRNAs reside mainly within the nucleus and are in turn degraded. For at least one rRNA type, the polyadenylation preferentially occurs on the precursor rather than the mature product. The existence of polyadenylated rRNAs may reflect a quality-control mechanism of rRNA biogenesis.

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