Deletion of the N-terminus of SF2/ASF permits RS-domain-independent pre-mRNA splicing

Shaw, S. D., Chakrabarti, S., Ghosh, G., Krainer, A. R. (2007) Deletion of the N-terminus of SF2/ASF permits RS-domain-independent pre-mRNA splicing. PLoS ONE, 2 (9). e854. ISSN 1932-6203 (Electronic)

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URL: http://www.ncbi.nlm.nih.gov/pubmed/17786225
DOI: 10.1371/journal.pone.0000854

Abstract

Serine/arginine-rich (SR) proteins are essential splicing factors with one or two RNA-recognition motifs (RRMs) and a C-terminal arginine- and serine-rich (RS) domain. SR proteins bind to exonic splicing enhancers via their RRM(s), and from this position are thought to promote splicing by antagonizing splicing silencers, recruiting other components of the splicing machinery through RS-RS domain interactions, and/or promoting RNA base-pairing through their RS domains. An RS domain tethered at an exonic splicing enhancer can function as a splicing activator, and RS domains play prominent roles in current models of SR protein functions. However, we previously reported that the RS domain of the SR protein SF2/ASF is dispensable for in vitro splicing of some pre-mRNAs. We have now extended these findings via the identification of a short inhibitory domain at the SF2/ASF N-terminus; deletion of this segment permits splicing in the absence of this SR protein's RS domain of an IgM pre-mRNA substrate previously classified as RS-domain-dependent. Deletion of the N-terminal inhibitory domain increases the splicing activity of SF2/ASF lacking its RS domain, and enhances its ability to bind pre-mRNA. Splicing of the IgM pre-mRNA in S100 complementation with SF2/ASF lacking its RS domain still requires an exonic splicing enhancer, suggesting that an SR protein RS domain is not always required for ESE-dependent splicing activation. Our data provide additional evidence that the SF2/ASF RS domain is not strictly required for constitutive splicing in vitro, contrary to prevailing models for how the domains of SR proteins function to promote splicing.

Item Type: Paper
Subjects: bioinformatics > genomics and proteomics > genetics & nucleic acid processing > DNA, RNA structure, function, modification > RNA expression
bioinformatics > genomics and proteomics > genetics & nucleic acid processing > protein structure, function, modification > protein types > enzymes > RNA polymerase
bioinformatics > genomics and proteomics > genetics & nucleic acid processing > protein structure, function, modification > protein types > serine arginine rich proteins
CSHL Authors:
Communities: CSHL labs > Krainer lab
CSHL Post Doctoral Fellows
Depositing User: CSHL Librarian
Date: 2007
Date Deposited: 03 Nov 2011 19:06
Last Modified: 03 May 2013 14:45
PMCID: PMC1952110
Related URLs:
URI: http://repository.cshl.edu/id/eprint/23137

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