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. 1989 Sep;9(9):3710–3719. doi: 10.1128/mcb.9.9.3710

PRP4: a protein of the yeast U4/U6 small nuclear ribonucleoprotein particle.

J Banroques 1, J N Abelson 1
PMCID: PMC362431  PMID: 2528687

Abstract

The Saccharomyces cerevisiae prp mutants (prp2 through prp11) are known to be defective in pre-mRNA splicing at nonpermissive temperatures. We have sequenced the PRP4 gene and shown that it encodes a 52-kilodalton protein. We obtained PRP4 protein-specific antibodies and found that they inhibited in vitro pre-mRNA splicing, which confirms the essential role of PRP4 in splicing. Moreover, we found that PRP4 is required early in the spliceosome assembly pathway. Immunoprecipitation experiments with anti-PRP4 antibodies were used to demonstrate that PRP4 is a protein of the U4/U6 small nuclear ribonucleoprotein particle (snRNP). Furthermore, the U5 snRNP could be immunoprecipitated through snRNP-snRNP interactions in the large U4/U5/U6 complex.

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