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EN
The effect of quercetin (3,3',4',5,7-pentahydroxyflavone) on the polypeptide elon­gation system isolated from rat liver cells, was investigated. Quercetin inhibited [ 4C]leucine incorporation into proteins in vitro and the inhibitory effect is being directed towards the elongation factor eEF-1, but not to eEF-2 and ribosomes. Quer­cetin was found to form a complex with EF-la, which was inactive in GTP-dependent binding to ribosomes. It can be suggested that quercetin can block the total or the part of the domain of EF-la structure that is responsible for formation of the ternary complex EF-la-GTP-i14C]Phe-tRNA and therefore preventing formation of the quater­nary complex with ribosomes.
XX
The elongation factor 2 (eEF-2) protein kinase was isolated from rat liver cells, purified and partly characterized. It was found that the enzyme exists in an inactive form in the homogenate of rat liver. The active fraction of kinase eEF-2 was obtained after removal of the inhibitory substance by hydroxyapatite column chromatography. The purified enzyme is an electTophoretically homogeneous protein with relative molecular mass of approximately 90000 and isoelectric point, pi = 5.9. The enzyme specifically phosphorylates the elongation factor eEF-2 in the presence of calmodulin and Ca2+.
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