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• W1488930887 startingPage "282" @default.
• W1488930887 abstract "Nuclear poly(A)-binding proteins (PABPs) are evolutionarily conserved proteins that play key roles in eukaryotic gene expression. In the fission yeast Schizosaccharomyces pombe, the major nuclear PABP, Pab2, functions in the maturation of small nucleolar RNAs as well as in nuclear RNA decay. Despite knowledge about its nuclear functions, nothing is known about how Pab2 is imported into the nucleus. Here, we show that Pab2 contains a proline-tyrosine nuclear localization signal (PY-NLS) that is necessary and sufficient for its nuclear localization and function. Consistent with the role of karyopherin β2 (Kapβ2)-type receptors in the import of PY-NLS cargoes, we show that the fission yeast ortholog of human Kapβ2, Kap104, binds to recombinant Pab2 and is required for Pab2 nuclear localization. The absence of arginine methylation in a basic region N-terminal to the PY-core motif of Pab2 did not affect its nuclear localization. However, in the context of a sub-optimal PY-NLS, we found that Pab2 was more efficiently targeted to the nucleus in the absence of arginine methylation, suggesting that this modification can affect the import kinetics of a PY-NLS cargo. Although a sequence resembling a PY-NLS motif can be found in the human Pab2 ortholog, PABPN1, our results indicate that neither a functional PY-NLS nor Kapβ2 activity are required to promote entry of PABPN1 into the nucleus of human cells. Our findings describe the mechanism by which Pab2 is imported into the nucleus, providing the first example of a PY-NLS import system in fission yeast. In addition, this study suggests the existence of alternative or redundant nuclear import pathways for human PABPN1." @default.
• W1488930887 created "2016-06-24" @default.
• W1488930887 creator A5017750476 @default.
• W1488930887 creator A5019011415 @default.
• W1488930887 date "2013-01-25" @default.
• W1488930887 modified "2023-09-24" @default.
• W1488930887 title "A Proline-Tyrosine Nuclear Localization Signal (PY-NLS) Is Required for the Nuclear Import of Fission Yeast PAB2, but Not of Human PABPN1" @default.
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• W1488930887 doi "https://doi.org/10.1111/tra.12036" @default.
• W1488930887 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/23279110" @default.
• W1488930887 hasPublicationYear "2013" @default.
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