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Nucleic Acids Research, 1992, Vol. 20, No. 23 6303-6309
© 1992

MOLECULAR BIOLOGY

A phosphorothioate at the 3' splice-site inhibits the second splicing step in a group I intron

EunRan Suh and Richard B. Waring*

Department of Biology, Temple University Philadelphia, PA 19122, USA

* To whom correspondence should be addressed

Received August 26, 1992. Revised October 21, 1992. Accepted October 21, 1992.

RNA polymerases can synthesize RNA containing phosphorothioate linkages in which a sulfur replaces one of the nonbridging oxygens. Only the Rp isomer is generated during transcription. A Rp phosphorothioate at the 5' splice-site of the Tetrahymena group I intron does not Inhibit splicing (McSwiggen,J.A. and Cech,T.R. (1989) Science 244, 679). Transcription of mutants in which the first base of the 3' exon, U+1, was mutated to C or G, in the presence, respectively, of either cytosine or guanosine thiotriphosphate, introduced a phosphorothioate at the 3' splice-site. In both cases exon ligation was blocked. In the phosphorothioate substituted U+1G mutant, a new 3' splice-site was selected one base downstream of the correct site; despite the fact that the correct site was selected with very high fidelity in unsubstituted RNA. In contrast, the exon ligation reaction was successfully performed in reverse using unsubstituted intron RNA and ligated exons containing an Rp phosphorothioate at the exon junction site. Chirality was reversed during transesteritication as in 5' splice-site cleavage (vide supra). This suggests that one non-bridging oxygen is particularly crucial for both splicing reactions.


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