PMID: 11911363Mar 26, 2002Paper

Defining a 5' splice site by functional selection in the presence and absence of U1 snRNA 5' end

RNA
Mette Lund, Jørgen Kjems

Abstract

Pre-mRNA splicing in metazoans is mainly specified by sequences at the termini of introns. We have selected functional 5' splice sites from randomized intron sequences through repetitive rounds of in vitro splicing in HeLa cell nuclear extract. The consensus sequence obtained after one round of selection in normal extract closely resembled the consensus of natural occurring 5' splice sites, suggesting that the selection pressures in vitro and in vivo are similar. After three rounds of selection under competitive splicing conditions, the base pairing potential to the U1 snRNA increased, yielding a G100%U100%R94%A67%G89%U76%R83% intronic consensus sequence. Surprisingly, a nearly identical consensus sequence was obtained when the selection was performed in nuclear extract containing U1 snRNA with a deleted 5' end, suggesting that other factors than the U1 snRNA are involved in 5' splice site recognition. The importance of a consecutive complementarity between the 5' splice site and the U1 snRNA was analyzed systematically in the natural range for in vitro splicing efficiency and complex formation. Extended complementarity was inhibitory to splicing at a late step in spliceosome assembly when pre-mRNA substrates were incubated in ...Continue Reading

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