Efficient association of U2 snRNPs with pre-mRNA requires an essential U2 RNA structural element.
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چکیده
منابع مشابه
Efficient association of U2 snRNPs with pre-mRNA requires an essential U2 RNA structural element.
To understand the role of U2 RNA structure in pre-mRNA splicing we have characterized several cold-sensitive mutations in an essential stem-loop of yeast U2. Although mutant U2 is stable in vivo after a shift to restrictive temperature, splicing is rapidly inhibited, suggesting a direct effect on U2 function rather than U2 synthesis or snRNP assembly. Splicing complexes form at 23 degrees C in ...
متن کاملPrp5 bridges U1 and U2 snRNPs and enables stable U2 snRNP association with intron RNA.
Communication between U1 and U2 snRNPs is critical during pre-spliceosome assembly; yet, direct connections have not been observed. To investigate this assembly step, we focused on Prp5, an RNA-dependent ATPase of the DExD/H family. We identified homologs of Saccharomyces cerevisiae Prp5 in humans (hPrp5) and Schizosaccharomyces pombe (SpPrp5), and investigated their interactions and function. ...
متن کاملMutations in an essential U2 small nuclear RNA structure cause cold-sensitive U2 small nuclear ribonucleoprotein function by favoring competing alternative U2 RNA structures.
Mutations in stem-loop IIa of yeast U2 RNA cause cold-sensitive growth and cold-sensitive U2 small nuclear ribonucleoprotein function in vitro. Cold-sensitive U2 small nuclear RNA adopts an alternative conformation that occludes the loop and disrupts the stem but does so at both restrictive and permissive temperatures. To determine whether alternative U2 RNA structure causes the defects, we tes...
متن کاملLethal and temperature-sensitive mutations and their suppressors identify an essential structural element in U2 small nuclear RNA.
U2 snRNA is an essential component of the splicing apparatus in eukaryotic cells. Three possible secondary structures for the highly conserved 5' half of U2 snRNA are consistent with U2 phylogenetic sequence variation. To distinguish among these models and to test the function of U2 structural elements, we made greater than 35 mutations in the yeast U2 snRNA gene. Some of the mutations were des...
متن کاملRequirements for U2 snRNP addition to yeast pre-mRNA.
The in vitro spliceosome assembly pathway is conserved between yeast and mammals as U1 and U2 snRNPs associate with the pre-mRNA prior to U5 and U4/U6 snRNPs. In yeast, U1 snRNP-pre-mRNA complexes are the first splicing complexes visualized on native gels, and association with U1 snRNP apparently commits pre-mRNA to the spliceosome assembly pathway. The current study addresses U2 snRNP addition...
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ژورنال
عنوان ژورنال: Genes & Development
سال: 1991
ISSN: 0890-9369
DOI: 10.1101/gad.5.12b.2521