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• W2105332322 abstract "A direct interaction of alpha beta gamma trimeric GTP binding proteins (G proteins; G0 and Gs) with nucleoside diphosphate kinase (NDP kinase) was investigated with homogeneously purified proteins. There was a progressive release of 32Pi from [gamma-32P]ATP when GDP-bound G0 was incubated together with NDP kinase. The Pi release induced by the interaction of G0 with NDP kinase was not accompanied by the dissociation of GDP bound to the alpha-subunit of G0. This was a sharp contrast to G protein-catalyzed GTP hydrolysis observed with GTP as the substrate; the dissociation of bound GDP was essentially required for the following binding of the substrate, GTP, to be hydrolyzed. A kinetic analysis displayed different properties for the substrate of NDP kinase between free GDP and G protein-bound GDP. NDP kinase-dependent phosphorylation of GDP on G0 was indeed demonstrated with adenosine 5'-(3-O-thio)triphosphate as the phosphate donor; there was a formation of guanosine 5'-(3-O-thio)triphosphate-bound G0 from the ATP analogue. Moreover, purified Gs was readily ADP-ribosylated by cholera toxin in the presence of NDP kinase, ATP, and an ADP-ribosylation factor, also suggesting that the nucleotide form on Gs was certainly GTP. These results indicate that NDP kinase can transfer the gamma-phosphate of ATP directly to GDP bound to G proteins and that this phosphorylation results in the activation of the signal-coupling proteins. A possible role of the new activation mechanism of G proteins is discussed in comparison with the previously characterized GDP-GTP exchange pathway by the agonist-receptor complex." @default.
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• W2105332322 date "1990-12-01" @default.
• W2105332322 modified "2023-10-18" @default.
• W2105332322 title "Conversion of GDP into GTP by nucleoside diphosphate kinase on the GTP-binding proteins." @default.
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• W2105332322 doi "https://doi.org/10.1016/s0021-9258(18)45773-0" @default.
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