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Instruments / Technical Area	Publication Details	Published	Actions
Krios II-Titan Krios II at Diamond	A human postcatalytic spliceosome structure reveals essential roles of metazoan factors for exon ligation Sebastian M. Fica , Chris Oubridge , Max E. Wilkinson , Andrew J. Newman , Kiyoshi Nagai Science 363, 710 - 714 DOI: 10.1126/science.aaw5569 PMID: 30705154 Diamond Proposal Number(s): [17434] Show Abstract ▼ Abstract: During exon ligation, the Saccharomyces cerevisiae spliceosome recognizes the 3'-splice site (3'SS) of precursor messenger RNA (pre-mRNA) through non-Watson-Crick pairing with the 5'SS and the branch adenosine, in a conformation stabilized by Prp18 and Prp8. Here we present the 3.3-angstrom cryo-electron microscopy structure of a human postcatalytic spliceosome just after exon ligation. The 3'SS docks at the active site through conserved RNA interactions in the absence of Prp18. Unexpectedly, the metazoan-specific FAM32A directly bridges the 5'-exon and intron 3'SS of pre-mRNA and promotes exon ligation, as shown by functional assays. CACTIN, SDE2, and NKAP-factors implicated in alternative splicing-further stabilize the catalytic conformation of the spliceosome during exon ligation. Together these four proteins act as exon ligation factors. Our study reveals how the human spliceosome has co-opted additional proteins to modulate a conserved RNA-based mechanism for 3'SS selection and to potentially fine-tune alternative splicing at the exon ligation stage.	Feb 2019

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Krios II-Titan Krios II at Diamond

A human postcatalytic spliceosome structure reveals essential roles of metazoan factors for exon ligation

Sebastian M. Fica , Chris Oubridge , Max E. Wilkinson , Andrew J. Newman , Kiyoshi Nagai

Science 363, 710 - 714

DOI: 10.1126/science.aaw5569

PMID: 30705154

Diamond Proposal Number(s): [17434]

Show Abstract ▼