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Chen, Hau-Ren; Tsao, Twee Y.; Chen, Chun-Hong; Tsai, Wei-Yü; Her, Lu-Shiun; Hsu, Milton Ming-Tao; Cheng, Soo-Chen
Proceedings of the National Academy of Sciences - PNAS, 05/1999, Letnik: 96, Številka: 10Journal Article
The SNT309 gene was identified via a mutation that causes lethality of cells in combination with a prp19 mutation. We showed previously that Snt309p is a component of the Prp19p-associated complex and that Snt309p, like Prp19p, is associated with the spliceosome immediately after or concomitantly with dissociation of U4 from the spliceosome. We show here that extracts prepared from the SNT309-deleted strain (Δ SNT309) were defective in splicing but could be complemented by addition of the purified Prp19p-associated complex. Isolation of the Prp19p-associated complex from Δ SNT309 extracts indicated that the complex was destabilized in the absence of Snt309p and dissociated on affinity chromatography, suggesting a role of Snt309p in stabilization of the Prp19p-associated complex. Addition of the affinity-purified Prp19p-Snt309p binary complex to Δ SNT309 extracts could reconstitute the Prp19p-associated complex. Genetic analysis further suggests that Snt309p plays a role in modulating interactions of Prp19p with other associated components to facilitate formation of the Prp19p-associated complex. A model for how Snt309p modulates such interactions is proposed.
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