Regulation of adenovirus alternative RNA splicing by dephosphorylation of SR proteins

Arvydas Kanopka, Oliver Mühlemann, Svend Petersen-Mahrt, Camilla Estmer, Christina Öhrmalm and Göran Akusjärvi ()
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Arvydas Kanopka: BMC, Uppsala University
Oliver Mühlemann: BMC, Uppsala University
Svend Petersen-Mahrt: BMC, Uppsala University
Camilla Estmer: BMC, Uppsala University
Christina Öhrmalm: BMC, Uppsala University
Göran Akusjärvi: BMC, Uppsala University

Nature, 1998, vol. 393, issue 6681, 185-187

Abstract: Abstract SR proteins are a family of essential splicing factors required for early recognition of splice sites during spliceosome assembly1,2. They also function as alternative RNA splicing factors when overexpressed in vivo or added in excess to extracts in vitro1,2. SR proteins are highly phosphorylated in vivo, a modification that is required for their function in spliceosome assembly3,4 and splicing catalysis5,6. Here we show that SR proteins purified from late adenovirus-infected cells are inactivated as splicing enhancer or splicing repressor proteins by virus-induced dephosphorylation. We further show that the virus-encoded protein E4-ORF4 activates dephosphorylation by protein phosphatase 2A of HeLa SR proteins and converts their splicing properties into that of SR proteins purified from late adenovirus-infected cells. Taken together, our results suggest that E4-ORF4 is an important factor controlling the temporal shift in adenovirus alternative RNA splicing. We conclude that alternative pre-mRNA splicing, like many other biological processes, is regulated by reversible protein phosphorylation.

Date: 1998
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DOI: 10.1038/30277

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