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• W2103760416 abstract "Although most cells are capable of transporting polyamines, the mechanism that regulates polyamine transport in eukaryotes is still largely unknown. Using a genetic screen for clones capable of restoring spermine sensitivity to spermine-tolerant mutants of Saccharomyces cerevisiae, we have demonstrated that Sky1p, a recently identified SR protein kinase, is a key regulator of polyamine transport. Yeast cells deleted for SKY1 developed tolerance to toxic levels of spermine, while overexpression of Sky1p in wild-type cells increased their sensitivity to spermine. Expression of the wild-type Sky1p but not of a catalytically inactive mutant restored sensitivity to spermine. SKY1 disruption results in dramatically reduced uptake of spermine, spermidine, and putrescine. In addition to spermine tolerance, sky1Delta cells exhibit increased tolerance to lithium and sodium ions but somewhat increased sensitivity to osmotic shock. The observed halotolerance suggests potential regulatory interaction between the transport of polyamines and inorganic ions, as suggested in the case of the Ptk2p, a recently described regulator of polyamine transport. We demonstrate that these two kinases act in two different signaling pathways. While deletion or overexpression of SKY1 did not significantly affect Pma1p activity, the ability of overexpressed Sky1p, Ptk1p, and Ptk2p to increase sensitivity to LiCl depends on the integrity of PPZ1 but not of ENA1." @default.
• W2103760416 created "2016-06-24" @default.
• W2103760416 creator A5064008475 @default.
• W2103760416 creator A5085777132 @default.
• W2103760416 date "2001-01-01" @default.
• W2103760416 modified "2023-09-27" @default.
• W2103760416 title "Screening for Modulators of Spermine Tolerance Identifies Sky1, the SR Protein Kinase of <i>Saccharomyces cerevisiae</i>, as a Regulator of Polyamine Transport and Ion Homeostasis" @default.
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• W2103760416 doi "https://doi.org/10.1128/mcb.21.1.175-184.2001" @default.
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