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• W2093037218 endingPage "4452" @default.
• W2093037218 startingPage "4439" @default.
• W2093037218 abstract "Didemnins and tamandarins are closely related marine natural products with potent inhibitory effects on protein synthesis and cell viability. On the basis of available biochemical and structural evidence and results from molecular dynamics simulations, a model is proposed that accounts for the strong and selective binding of these compounds to human elongation factor eEF1A in the presence of GTP. We suggest that the p-methoxyphenyl ring of these cyclic depsipeptides is inserted into the same pocket in eEF1A that normally lodges either the 3' terminal adenine of aminoacylated tRNA, as inferred from two prokaryotic EF-Tu.GTP.tRNA complexes, or the aromatic side chain of Phe/Tyr-163 from the nucleotide exchange factor eEF1Balpha, as observed in several X-ray crystal structures of a yeast eEF1A:eEF1Balpha complex. This pocket, which has a strong hydrophobic character, is formed by two protruding loops on the surface of eEF1A domain 2. Further stabilization of the bound depsipeptide is brought about by additional crucial interactions involving eEF1A domain 1 in such a way that the molecule fits snugly at the interface between these two domains. In the GDP-bound form of eEF1A, this binding site exists only as two separate halves, which accounts for the much greater affinity of didemnins for the GTP-bound form of this elongation factor. This binding mode is entirely different from those seen in the complexes of the homologous prokaryotic EF-Tu with kirromycin-type antibiotics or the cyclic thiazolyl peptide antibiotic GE2270A. Interestingly, the set of interactions used by didemnins to bind to eEF1A is also distinct from that used by eEF1Balpha or eEF1Bbeta, thus establishing a competition for binding to a common site that goes beyond simple molecular mimicry. The model presented here is consistent with both available biochemical evidence and known structure-activity relationships for these two classes of natural compounds and synthetic analogues and provides fertile ground for future research." @default.
• W2093037218 created "2016-06-24" @default.
• W2093037218 creator A5037738920 @default.
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• W2093037218 date "2004-07-22" @default.
• W2093037218 modified "2023-10-14" @default.
• W2093037218 title "Structural Basis for the Binding of Didemnins to Human Elongation Factor eEF1A and Rationale for the Potent Antitumor Activity of These Marine Natural Products" @default.
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• W2093037218 doi "https://doi.org/10.1021/jm0306428" @default.
• W2093037218 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/15317456" @default.
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