The identification and characterization of a novel splicing protein, Isy1p, of Saccharomyces cerevisiae

Citation
I. Dix et al., The identification and characterization of a novel splicing protein, Isy1p, of Saccharomyces cerevisiae, RNA, 5(3), 1999, pp. 360-368
Citations number
38
Categorie Soggetti
Biochemistry & Biophysics
Journal title
RNA-A PUBLICATION OF THE RNA SOCIETY
ISSN journal
13558382 → ACNP
Volume
5
Issue
3
Year of publication
1999
Pages
360 - 368
Database
ISI
SICI code
1355-8382(199903)5:3<360:TIACOA>2.0.ZU;2-6
Abstract
We have identified a novel splicing factor, Isy1p, through two-hybrid scree ns for interacting proteins involved in nuclear pre-mRNA splicing. Isy1p wa s tagged and demonstrated to be part of the splicing machinery, associated with spliceosomes throughout the splicing reactions. At least a portion of the Isy1 protein population is associated with snRNAs; low levels of U5 and U6 snRNAs are coimmunoprecipitated specifically with Isy1p. When the ISY1 gene was knocked out, no defect in vegetative growth was observed. Using a sensitive in vivo splicing assay, however, we observed lower splicing effic iency in the Isy1 null mutant compared to wild-type, indicating that Isy1p is important in the optimization of splicing.