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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...
EF-1C is a component of the aggregate EF-1B, consisting of the subunit forms EF-1A-EF-1C; it was isolated by dissociation of this aggregate in the presence of GTF. The subunit form EF-1C stimulates binding of aminoacyl-tRNA to ribosomes, catalysed by EF-1A, similarly as EF-lßy which stimulates the activity of EF-1 in other eukaryotic cells. EF-1C in the presence of 6 M urea was separated into two...
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