NDLI: Evidence that the 60-kDa protein of 17S U2 small nuclear ribonucleoprotein is immunologically and functionally related to the yeast PRP9 splicing factor and is required for the efficient formation of prespliceosomes.

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Evidence that the 60-kDa protein of 17S U2 small nuclear ribonucleoprotein is immunologically and functionally related to the yeast PRP9 splicing factor and is required for the efficient formation of prespliceosomes.

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Evidence that the 60-kDa protein of 17S U2 small nuclear ribonucleoprotein is immunologically and functionally related to the yeast PRP9 splicing factor and is required for the efficient formation of prespliceosomes.

Content Provider	PubMed Central
Author	Behrens, S. E. Galisson, F. Legrain, P. Lührmann, R.
Abstract	Small nuclear ribonucleoprotein (snRNP) U2 functions in the splicing of mRNA by recognizing the branch site of unspliced mRNA. The binding of U2 snRNP and other components to pre-mRNA leads to the formation of a stable prespliceosome. In HeLa nuclear extracts, U2 snRNP exists either as a 17S form (under low salt conditions) or a 12S form (at higher salt concentrations). We have recently shown that the purified 17S U2 snRNP contains nine proteins with apparent molecular masses of 35, 53, 60, 66, 92, 110, 120, 150, and 160 kDa in addition to the common snRNP proteins and the U2 proteins A' and B" that are found in the 12S U2 snRNP form. By using antibodies against the PRP9 protein from Saccharomyces cerevisiae (a protein required for the addition of U2 to prespliceosomes in yeast), we have shown that the 60-kDa protein specific to human U2 snRNP particles is structurally related to the yeast PRP9 protein. Interestingly, anti-PRP9 antibodies strongly inhibit prespliceosome formation in HeLa nuclear splicing extracts, resulting in a complete inhibition of the mRNA splicing reaction in vitro. This indicates that the U2 60-kDa protein may also be functionally related to its yeast counterpart PRP9. Most importantly, the addition of purified 17S U2 snRNPs, but not of 12S U2 snRNPs, to HeLa splicing extracts in which the endogeneous U2 snRNPs have been functionally neutralized with anti-PRP9 antibodies fully restores the mRNA-splicing activity of the extracts. These data suggest further that the 17S form is the functionally active form of U2 snRNP in the spliceosome.
Starting Page	8229
File Format	PDF
ISSN	10916490
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	17
Volume Number	90
Language	English
Publisher Date	1993-09-01
Access Restriction	Open
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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