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Mol Cell Biol. 1993 November; 13(11): 6841-6848

Short artificial hairpins sequester splicing signals and inhibit yeast pre-mRNA splicing.

Howard Hughes Medical Institute, Department of Biology, Brandeis University, Waltham, Massachusetts 02254.

ABSTRACT

To examine the stability of yeast (Saccharomyces cerevisiae) pre-mRNA structures, we inserted a series of small sequence elements that generated potential RNA hairpins at the 5' splice site and branch point regions. We analyzed spliceosome assembly and splicing in vitro as well as splicing and nuclear pre-mRNA retention in vivo. Surprisingly, the inhibition of in vivo splicing approximately paralleled that of in vitro splicing. Even a 6-nucleotide hairpin could be shown to inhibit splicing, and a 15-nucleotide hairpin gave rise to almost complete inhibition. The in vitro results indicate that hairpins that sequester the 5' splice site have a major effect on the early steps of spliceosome assembly, including U1 small nuclear ribonucleoprotein binding. The in vivo experiments lead to comparable conclusions as the sequestering hairpins apparently result in the transport of pre-mRNA to the cytoplasm. The observations are compared with previous data from both yeast and mammalian systems and suggest an important effect of pre-mRNA structure on in vivo splicing.

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