While cytosolic nucleoside diphosphate kinases can efficiently use several nucleotide triphosphates as a phosphate donor, the high concentrations of ATP relative to other nucleoside triphosphates in vivo makes it the likely major phosphate donor in these reactions and only reactions with ATP as the phosphate donor are annotated. All of these phosphorylation reactions are freely reversible in vitro (Parks and Agarwal 1973; Schaertl et al. 1998), but the high ratio of ATP to ADP concentrations in the cytosol should favor the conversion of (d)NDP and ATP to (d)NTP and ADP.
Boyer, PD
Janin, J, Moréra, S, Schneider, B, Deville-Bonne, D, Veron, M, Gallois-Montbrun, S, Chen, Y
Vonica, A, Lascu, I, Gilles, AM, Presecan, E
Berg, P, Joklik, WK
Konrad, M, Geeves, MA, Schaertl, S
Konrad, M, Agou, F, Lacombe, ML, Sarger, C, Raschella, G, Lascu, I, Giartosio, A, Cherfils, J, Tissier, P, Erent, M, Gonin, P
nucleoside diphosphate kinase activity of NME1,2 hexamers [cytosol]
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