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Publication

Synergistic assembly of human pre-spliceosomes across introns and exons.

Joerg E Braun | Larry J Friedman | Jeff Gelles | Melissa J Moore

eLife | 2018

Most human genes contain multiple introns, necessitating mechanisms to effectively define exons and ensure their proper connection by spliceosomes. Human spliceosome assembly involves both cross-intron and cross-exon interactions, but how these work together is unclear. We examined in human nuclear extracts dynamic interactions of single pre-mRNA molecules with individual fluorescently tagged spliceosomal subcomplexes to investigate how cross-intron and cross-exon processes jointly promote pre-spliceosome assembly. U1 subcomplex bound to the 5' splice site of an intron acts jointly with U1 bound to the 5' splice site of the next intron to dramatically increase the rate and efficiency by which U2 subcomplex is recruited to the branch site/3' splice site of the upstream intron. The flanking 5' splice sites have greater than additive effects implying distinct mechanisms facilitating U2 recruitment. This synergy of 5' splice sites across introns and exons is likely important in promoting correct and efficient splicing of multi-intron pre-mRNAs.

Pubmed ID: 29932423 RIS Download

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Associated grants

Agency: NIH HHS, United States
Id: R01 GM081648
Agency: NIGMS NIH HHS, United States
Id: R01 GM053007
Agency: NIH HHS, United States
Id: R01 GM053007
Agency: NIGMS NIH HHS, United States
Id: R01 GM081648
Agency: Howard Hughes Medical Institute, United States

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