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Nucleic Acids Research, Vol 24, Issue 13 2585-2591, Copyright © 1996 by Oxford University Press

ARTICLES

The Schizosaccharomyces pombe pla1 gene encodes a poly(A) polymerase and can functionally replace its Saccharomyces cerevisiae homologue

M Ohnacker, L Minvielle-Sebastia and W Keller
Department of Cell Biology, Biozentrum, University of Basel, Switzerland.

We have isolated the poly(A) polymerase (PAP) encoding gene pla1 [for poly(A) polymerase] from the fission yeast Schizosaccharomyces pombe. Protein sequence alignments with other poly(A) polymerases reveal that pla1 is more closely related to Saccharomyces cerevisiae PAP than to bovine PAP. The two yeast poly(A) polymerases share significant sequence homology not only in the generally conserved N-terminal part but also in the C-terminus. Furthermore, pla1 rescues a S. cerevisiae PAP1 disruption mutant. An extract from the complemented strain is active in the specific in vitro polyadenylation assay. In contrast, recombinant PLA1 protein can not replace bovine PAP in the mammalian in vitro polyadenylation assay. These results indicate a high degree of conservation of the polyadenylation machinery among the evolutionary diverged budding and fission yeasts.
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