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Proc Natl Acad Sci U S A. Apr 1990; 87(8): 3082–3086.
PMCID: PMC53838

A mammalian protein of 220 kDa binds pre-mRNAs in the spliceosome: a potential homologue of the yeast PRP8 protein.

Abstract

A mammalian protein of approximately 220 kDa (p220) was UV-crosslinked to precursor mRNAs (pre-mRNAs) under splicing conditions. The kinetics and biochemical requirements of the UV-crosslinking of p220 corresponded to the kinetics and biochemical requirements of spliceosome formation. On Western blots, antibodies against the yeast splicing factor PRP8 recognized a doublet of proteins, the faster migrating of which comigrated with p220. Furthermore, UV-crosslinked p220 was immunoprecipitated with anti-PRP8 antisera. These results suggest structural conservation of the splicing factor PRP8 from yeast to mammals and show that this protein is in close proximity to the pre-mRNA in the spliceosome.

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