General splicing factors SF2 and SC35 have equivalent activities in vitro, and both affect alternative 5' and 3' splice site selection

X. D. Fu, A. Mayeda, T. Maniatis, A. R. Krainer

Research output: Contribution to journalArticle

188 Citations (Scopus)

Abstract

The human pre-mRNA splicing factors SF2 and SC35 have similar electrophoretic mobilities, and both of them contain an N-terminal ribonucleoprotein (RNP)-type RNA-recognition motif and a C-terminal arginine/serine-rich domain. However, the two proteins are encoded by different genes and display only 31% amino acid sequence identity. Here we report a systematic comparison of the splicing activities of recombinant SF2 and SC35. We find that either protein can reconstitute the splicing activity of S100 extracts and of SC35-immunodepleted nuclear extracts. Previous studies revealed that SF2 influences alternative 5' splice site selection in vitro, by favoring proximal over distal 5' splice sites, and that the A1 protein of heterogeneous nuclear RNP counteracts this effect. We now show that SC35 has a similar effect on competing 5' splice sites and is also antagonized by A1 protein. In addition, we report that both SF2 and SC35 also favor the proximal site in a pre-mRNA containing duplicated 3' splice sites, but this effect is not modulated by A1. We conclude that SF2 and SC35 are distinct splicing factors, but they display indistinguishable splicing activities in vitro.

Original languageEnglish
Pages (from-to)11224-11228
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume89
Issue number23
DOIs
Publication statusPublished - 15-12-1992
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General

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