N(2)-(ADP-D-ribosyl)-GTP + nicotinamide + H(+) => GTP + NAD(+)
n(2)-(adp-d-ribosyl)-gtp + nicotinamide + h(+) => gtp + nad(+)
N(2)-(ADP-D-ribosyl)-GTP + nicotinamide + H(+) => GTP + NAD(+)
n(2)-(adp-d-ribosyl)-gtp + nicotinamide + h(+) => gtp + nad(+)