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• W2019931071 abstract "Prp24 is an essential yeast U6 snRNP protein with four RNA recognition motifs (RRMs) that facilitates the association of U4 and U6 snRNPs during spliceosome assembly. Genetic interactions led to the proposal that RRMs 2 and 3 of Prp24 bind U6 RNA, while RRMs 1 and 4 bind U4 RNA. However, the function of each RRM has yet to be established through biochemical means. We compared the binding of recombinant full-length Prp24 and truncated forms lacking RRM 1 or RRM 4 with U6 RNA. Contrary to expectations, we found that the N-terminal segment containing RRM 1 is important for high-affinity binding to U6 RNA and for discrimination between wild-type U6 RNA and U6 with point mutations in the 3' intramolecular stem-loop. In contrast, deletion of RRM 4 and the C terminus did not significantly alter the affinity for U6 RNA, but resulted in the formation of higher order Prp24.U6 complexes. Truncation and internal deletion of U6 RNA mapped three Prp24-binding sites, with the central site providing most of the affinity for Prp24. A newly identified temperature-sensitive lethal point mutation in RRM 1 is exacerbated by mutations in the U6 RNA telestem, as is a mutation in RRM 2, but not one in RRM 3. We propose that RRMs 1 and 2 of yeast Prp24 bind the same central site in U6 RNA that is bound by the two RRMs of human Prp24, and that RRMs 3 and 4 bind lower affinity flanking sites, thereby restricting the stoichiometry of Prp24 binding." @default.
• W2019931071 created "2016-06-24" @default.
• W2019931071 creator A5066704185 @default.
• W2019931071 creator A5088719852 @default.
• W2019931071 date "2005-04-05" @default.
• W2019931071 modified "2023-10-13" @default.
• W2019931071 title "The N- and C-terminal RNA recognition motifs of splicing factor Prp24 have distinct functions in U6 RNA binding" @default.
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• W2019931071 doi "https://doi.org/10.1261/rna.2010905" @default.
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