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Related Experiment Videos

The SRm160/300 splicing coactivator is required for exon-enhancer function.

A G Eldridge1, Y Li, P A Sharp

  • 1Banting and Best Department of Medical Research, University of Toronto, Toronto, ON M5G 1L6, Canada.

Proceedings of the National Academy of Sciences of the United States of America
|May 26, 1999
PubMed
Summary

This study reveals that the SRm160/300 splicing coactivator is essential for exonic splicing enhancer (ESE) function. It facilitates interactions between ESE-binding proteins and the spliceosome machinery, promoting pre-mRNA splicing.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Exonic splicing enhancers (ESEs) are crucial regulatory sequences in pre-mRNA.
  • Serine-arginine (SR) repeat proteins bind ESEs to facilitate splice site recognition and splicing complex assembly.

Purpose of the Study:

  • To investigate the role of the identified splicing coactivator, SRm160/300, in ESE-mediated pre-mRNA splicing.
  • To elucidate the molecular mechanisms by which SRm160/300 functions in conjunction with ESEs and the spliceosome.

Main Methods:

  • Utilized pre-mRNA derived from the Drosophila doublesex gene.
  • Investigated the association of SRm160/300, U1 snRNP, U2 snRNP, and ESE-binding factors with pre-mRNA.
  • Examined protein-protein interactions between SRm160/300, U2 snRNP, and Transformer 2 homolog.

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Main Results:

  • SRm160/300 is indispensable for a purine-rich ESE to enhance splicing of the doublesex pre-mRNA.
  • The recruitment of SRm160/300 and U2 snRNP to pre-mRNA is dependent on U1 snRNP and ESE-bound factors.
  • SRm160/300 directly interacts with U2 snRNP and a human Transformer 2 homolog that binds purine-rich ESEs.

Conclusions:

  • SRm160/300 acts as a critical splicing coactivator, bridging ESE-bound activators with the spliceosome's snRNP machinery.
  • This interaction model explains how ESEs, through coactivators like SRm160/300, regulate alternative splicing.