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Research Papers
Columbia University, Department of Biological Sciences, New York, New York 10027, USA.
Abstract
ASF/SF2 is a member of a conserved family of splicing factors known as SR proteins. These proteins, which are necessary for splicing in vitro, contain one or two amino-terminal RNP-type RNA-binding domains and an extensively phosphorylated carboxy-terminal region enriched in repeating Arg-Ser dipeptides (RS domains). Previous studies have suggested that RS domains participate in protein-protein interactions with other RS domain-containing proteins. Here we provide evidence that the RS domain of unphosphorylated recombinant ASF/SF2 is necessary, but not sufficient, for binding to the U1 snRNP-specific 70-kD protein (70K) in vitro. An apparent interaction of the isolated RS domain with 70K was observed if contaminating RNA was not removed, suggesting a nonspecific bridging between the basic RS domain, RNA, and 70K. In vitro phosphorylation of recombinant ASF/SF2 both significantly enhanced binding to 70K and also eliminated the RS domain-RNA interaction. Providing evidence that these interactions are relevant to splicing, ASF/SF2 can bind selectively to U1 snRNP in an RS domain-dependent, phosphorylation-enhanced manner. We also describe conditions that reveal for the first time a phosphorylation requirement for ASF/SF2 splicing activity in vitro.
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