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• W2019960359 abstract "The inhibitory activities of 5,6-dihydro-4H-1,3-selenazine derivatives on protein kinases were investigated. In a multiple protein kinase assay using a postnuclear fraction of v-src-transformed NIH3T3 cells, 4-ethyl-4-hydroxy-2-p-tolyl-5, 6-dihydro-4H-1,3-selenazine (TS-2) and 4-hydroxy-6-isopropyl-4-methyl-2-p-tolyl-5,6-dihydro-4H-1, 3-selenazine (TS-4) exhibited selective inhibitory activity against eukaryotic elongation factor-2 kinase (eEF-2K) over protein kinase A (PKA), protein kinase C (PKC) and protein tyrosine kinase (PTK). In further experiments using purified kinases, TS-2 (IC(50)=0.36 microM) and TS-4 (IC(50)=0.31 microM) inhibited eEF-2K about 25-fold more effectively than calmodulin-dependent protein kinase-I (CaMK-I), and about 6-fold (TS-2) or 33-fold (TS-4) more effectively than calmodulin-dependent protein kinase-II (CaMK-II), respectively. TS-2 and TS-4 showed much weaker inhibitory activity toward PKA and PKC, while TS-4, but not TS-2, moderately inhibited immunoprecipitated v-src kinase. TS-2 (10.7-fold) and TS-4 (12.5-fold) demonstrated more potent and more specific eEF-2K inhibitory activity than rottlerin, a previously identified eEF-2K inhibitor. TS-2 inhibited ATP or eEF-2 binding to eEF-2K in a competitive or non-competitive manner, respectively. In cultured v-src-transformed NIH3T3 cells, TS-2 also decreased phospho-eEF-2 protein level (IC(50)=4.7 microM) without changing the total eEF-2 protein level. Taken together, these results suggest that TS-2 and TS-4 are the first identified selective eEF-2K inhibitors and should be useful tools for studying the function of eEF-2K." @default.
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• W2019960359 date "2000-07-01" @default.
• W2019960359 modified "2023-10-12" @default.
• W2019960359 title "Novel compounds, ‘1,3-selenazine derivatives’ as specific inhibitors of eukaryotic elongation factor-2 kinase" @default.
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• W2019960359 doi "https://doi.org/10.1016/s0304-4165(00)00061-1" @default.
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