Antagonism between RSF1 and SR proteins for both splice-site recognition in vitro and Drosophila development

Emmanuel Labourier, Henri Marc Bourbon, Imed Eddine Gallouzi, Maggy Fostier, Eric Allemand, Jamal Tazi

Research output: Contribution to journalArticlepeer-review

48 Scopus citations


Specific recognition of splice sites within metazoan mRNA precursors (pre-mRNAs) is a potential stage for gene regulation by alternative splicing. Splicing factors of the SR protein family play a major role in this regulation, as they are required for early recognition of splice sites during spliceosome assembly. Here, we describe the characterization of RSF1, a splicing repressor isolated from Drosophila, that functionally antagonizes SR proteins. Like the latter, RSF1 comprises an amino-terminal RRM-type RNA- binding domain, whereas its carboxy-terminal part is enriched in glycine (G), arginine (R), and serine (S) residues (GRS domain). RSF1 induces a dose- sensitive inhibition of splicing for several reporter pre-mRNAs, an inhibition that occurs at the level of early splicing complexes formation. RSF1 interacts, through its GRS domain, with the RS domain of the SR protein SF2/ASF and prevents the latter from cooperating with the U1 small nuclear ribonucleoprotein particle (U1 snRNP) in binding pre-mRNA. Furthermore, overproduction of RSF 1 in the fly rescues several developmental defects caused by overexpression of the splicing activator SR protein B52/SRp55. Therefore, RSF1 may correspond to the prototypical member of a novel family of general splicing repressors that selectively antagonize the effect of SR proteins on 5' splice-site recognition.
Original languageEnglish (US)
Pages (from-to)740-753
Number of pages14
JournalGenes and Development
Issue number6
StatePublished - Mar 15 1999
Externally publishedYes

Bibliographical note

Generated from Scopus record by KAUST IRTS on 2022-09-13

ASJC Scopus subject areas

  • General Medicine


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