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          Institute: MPI für biophysikalische Chemie     Collection: Zelluläre Biochemie (Prof. Reinhard Lührmann)     Display Documents

ID: 16664.0, MPI für biophysikalische Chemie / Zelluläre Biochemie (Prof. Reinhard Lührmann)
The ribosomal translocase homologue Snu114p is involved in unwinding U4/U6 RNA during activation of the spliceosome
Authors:Bartels, C.; Klatt, C.; Luehrmann, R.; Fabrizio, P.
Date of Publication (YYYY-MM-DD):2002-09
Title of Journal:EMBO Reports
Issue / Number:9
Start Page:875
End Page:880
Review Status:Peer-review
Audience:Not Specified
Abstract / Description:Snu114p is a yeast U5 snRNP protein homologous to the ribosomal elongation factor EF-2. Snu114p exhibits the same domain structure as EF-2, including the G-domain, but with an additional N-terminal domain. To test whether Snu114p in the spliceosome is involved in rearranging RNA secondary structures (by analogy to EF-2 in the ribosome), we created conditionally lethal mutants. Deletion of this N-terminal domain (snu114DeltaN) leads to a temperature-sensitive phenotype at 37degreesC and a pre-mRNA splicing defect in vivo. Heat treatment of snu114DeltaN extracts blocked splicing in vitro before the first step. The snu114DeltaN still associates with the tri-snRNP, and the stability of this particle is not significantly impaired by thermal inactivation. Heat treatment of snu114DeltaN extracts resulted in accumulation of arrested spliceosomes in which the U4 RNA was not efficiently released, and we show that U4 is still base paired with the U6 RNA. This suggests that Snu114p is involved, directly or indirectly, in the U4/U6 unwinding, an essential step towards spliceosome activation.
Comment of the Author/Creator:Date: 2002, SEP
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für biophysikalische Chemie/Abt. Reinhard Lührmann / 100
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