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    Proc Natl Acad Sci U S A. 2004 Jun 8;101(23):8581-6. Epub 2004 Jun 1.

    Polyadenylation of rRNA in Saccharomyces cerevisiae.

    Kuai L, Fang F, Butler JS, Sherman F.

    Source

    Department of Biochemistry and Biophysics, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642, USA.

    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.

    PMID:
    15173578
    [PubMed - indexed for MEDLINE]
    PMCID: PMC423237
    Free PMC Article

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