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- W208072073 abstract "1. The requirement for bivalent cations in catalysis of NAD formation from ATP and NMN in the presence of NMN adenylyltransferase of pig-liver nuclei was studied. Rates of NAD formation in the presence of the activating cations Cd(2+), Mn(2+), Mg(2+), Zn(2+), Co(2+) and Ni(2+) were approximately a linear function of heats of hydration of the corresponding ions. Ba(2+), Sr(2+), Ca(2+), Cu(2+) and Be(2+) did not activate the enzyme; Be(2+) inhibited the reaction in the presence of Mg(2+) and, to a greater extent, in the presence of Ni(2+). 2. Michaelis constants for NAD formation, measured in a coupled assay with NMN adenylyltransferase and alcohol dehydrogenase at pH8.0 and 25 degrees , in the presence of 3mm concentrations of the unvaried reactants, were 88+/-7mum-ATP, 42+/-4mum-NMN and 85+/-4mum-Mg(2+). The results at this pH and at pH7.5 were consistent with mechanisms in which Mg(2+)-ATP complex is a reactant and free ATP a competitive inhibitor. 3. Formation of nicotinamide-hypoxanthine dinucleotide from NMN and ITP in the presence of the transferase was also more rapid with Ni(2+) and Co(2+) than with Mg(2+)." @default.
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- W208072073 title "The requirement for bivalent cations in formation of nicotinamide-adenine dinucleotide by nicotinamide mononucleotide adenylyltransferase of pig-liver nuclei" @default.
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- W208072073 doi "https://doi.org/10.1042/bj1010208" @default.
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