An early ancestor in the evolution of splicing: A Trypanosoma cruzi serine-arginine-rich protein (TcSR) is functional in cis-splicing
A novel serine-arginine-rich protein designated TcSR was identified in Trypanosoma cruzi. The deduced amino acid sequence reveals that TcSR is a member of the SR protein family of splicing factors that contains two RNA-binding domains at the N-terminal side and several serine-arginine repeats at the...
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| Autores principales: | , , , , , , , , , |
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2003
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01666851_v127_n1_p37_Portal http://hdl.handle.net/20.500.12110/paper_01666851_v127_n1_p37_Portal |
| Aporte de: |
| Sumario: | A novel serine-arginine-rich protein designated TcSR was identified in Trypanosoma cruzi. The deduced amino acid sequence reveals that TcSR is a member of the SR protein family of splicing factors that contains two RNA-binding domains at the N-terminal side and several serine-arginine repeats at the COOH-terminus. Over expression of either TcSR or the human SR-protein associated splicing factor/splicing factor 2 (ASF/SF2) in wild-type Schizosaccharomyces pombe, provoked an elongated phenotype similar to that of fission yeast over expressing the SR-containing splicing factor Prp2, a U2AF65 orthologue. When a double mutant strain lacking two SR protein-specific protein kinases was used, expression of TcSR or human SR ASF/SF2 splicing factor reverted the mutant to a wild-type phenotype. Transient expression of TcSR in HeLa cells stimulated the inclusion of the EDI exon of human fibronectin in an in vivo functional alternative cis-splicing assay. Inclusion was dependent on a splicing enhancer sequence present in the EDI exon. In addition, TcSR and peptides carrying TcSR-RS domain sequences were phosphorylated by a human SR protein kinase. These results indicate that TcSR is a member of the SR splicing network and that some components common to the trans- and cis-splicing machineries evolved from the early origins of the eukaryotic lineage. © 2002 Elsevier Science B.V. All rights reserved. |
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