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Nucleic Acids Research, 1990, Vol. 18, No. 17 5207-5212
© 1990

MOLECULAR BIOLOGY

Immunoprecipitation distinguishes non-overlapping groups of snRNPs in Schizosaccharomyces pombe

David Tollervey, Gabriela Tessars1 and Reinhard Lührmann1

European Molecular Biology Laboratory Meyerhofstrasse 1, 6900 Heidelberg 1Instituto für Molkularbiologie und Tumorforschung, Philipps-Universität Marburg Emil-Mannkopf-Strasse 2, D-3550 Marburg, FRG

Received May 9, 1990. Revised July 30, 1990. Accepted July 30, 1990.

The large number of snRNAs in the fission yeast Schizosaccharomyces pombe can be divided into four non-ovetlapping groups by immunoprecipitation with antibodies directed against mammalian snRNP proteins. 1) Of the abundant snRNAs, anti-Sm sera precipitate only the spliceosomal snRNAs U1, U2, U4, U5 and U6. Surprisingly, three Sm-sera tested distinguish between U2, U4 and U5 and U1 from S.pombe; one precipitating only U1 and two precipitating U2, U4 and U5 but not U1. 2) A group of 11 moderately abundant snRNAs are not detectably precipitated by human anti-Sm sera, but are specifically precipitated by monoclonal antibody H57 specific for the human B/B' polypeptides. From Aspergillus nidulans this antibody also precipitates at least 12 snRNAs. 3) Anti-(U3)RNP sera do not precipitate the above snRNAs, but precipitate at least 6 further snRNAs, including the homologues of U3. Both the anti-(U3)RNP sera and H57 also efficiently precipitate a number of discrete non-capped RNAs. 4) A small number of additional snRNAs are not detectably precipitated by any anti-serum tested to date, further analysis may identify antisera specific for these snRNPs. Western blots of purified snRNP proteins were used to identify the S.pombe proteins responsible for these immunoprecipitations. Several Sm-sera decorate a 16.3kD protein which may be a D protein homologue, monoclonal H57 decorates a further protein of 16kD and an antl-(U3)RNP serum decorates the homologue of the 36kD U3-specific protein, fibrillarin.


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Characterization of the Schizosaccharomyces pombe orthologue of the human survival motor neuron (SMN) protein
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