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. 1988 Oct 25;16(20):9457–9475. doi: 10.1093/nar/16.20.9457

Splicing and spliceosome formation of the yeast MATa1 transcript require a minimum distance from the 5' splice site to the internal branch acceptor site.

K Köhrer 1, H Domdey 1
PMCID: PMC338756  PMID: 3054807

Abstract

Small deletions of 6, 7, and 12 nucleotides introduced between the 5' splice site and the internal branch acceptor site of the first intron of the yeast MATa1 gene completely abolish accurate splicing in vitro in these constructs. Splicing only occurs at an alternative 5' splice site which was found in the first exon of the MATa1 gene and which is used both in vivo and in vitro. The splicing defect cannot be cured by expanding the distance from the branch point to the 3' splice site. If the alternative 5' splice site is deleted as well in these constructs, neither spliced products nor spliceosomes are formed. Our findings especially lead to the conclusion that a minimum distance between the 5' splice site and the internal branch acceptor site of the intron is required for the formation of splicing complexes and for accurate splicing.

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