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• W1569558374 abstract "Interaction of the mRNA cap with the translational machinery is a critical and early step in the initiation of protein synthesis. To better understand this process, we determined kinetic constants for the interaction of m(7)GpppG with human eIF4E by stopped-flow fluorescence quenching in the presence of a 90-amino acid fragment of human eIF4G that contains the eIF4E-binding domain (eIF4G(557-646)). The values obtained, k(on) = 179 x 10(6) m(-1) s(-1) and k(off) = 79 s(-1), were the same as reported previously in the absence of an eIF4G-derived peptide. We also used surface plasmon resonance to determine kinetic constants for the binding of eIF4E to eIF4G(557-646), both in the presence and absence of m(7)GpppG. The results indicated that eIF4G(557-646) binds eIF4E and eIF4E.m(7)GpppG at the same rate, with k(on) = 3 x 10(6) m(-1) s(-1) and k(off) = 0.01 s(-1). Our data represent the first full kinetic description of the interaction of eIF4E with its two specific ligands. The results demonstrate that the formation of the m(7)GpppG.eIF4E.eIF4G(557-646) complex obeys a sequential, random kinetic mechanism and that there is no preferential pathway for its formation. Thus, even though eIF4G(557-646) binds eIF4E tightly, it does not increase the affinity of eIF4E for m(7)GpppG, as has been claimed in several previous publications. We did, in fact, observe increased binding to m(7)GTP-Sepharose in the presence of eIF4G(557-646), but only with recombinant eIF4E that was prepared from inclusion bodies." @default.
• W1569558374 created "2016-06-24" @default.
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• W1569558374 date "2008-09-01" @default.
• W1569558374 modified "2023-10-13" @default.
• W1569558374 title "Kinetic Mechanism for Assembly of the m7GpppG·eIF4E·eIF4G Complex" @default.
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• W1569558374 doi "https://doi.org/10.1074/jbc.m801786200" @default.
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