11beta-HSD1 is an NADP + / NADPH-dependent oxidoreductase which is mainly expressed in liver and kidney , while 11beta-HSD2 is an NAD + - dependent oxidase which is predominantly expressed in kidney.
Oxidation of F to E : NAD was the exclusively used cosubstrate ; the affinity (Michael 's constant (Km) for F = 25.5 nmol/L) and the maximum velocity (Vmax = 22.9 nmol/mg/min) were high.
These particles catalyse the ATP-driven reduction of NAD (+) by succinate.
When niacin-requiring E. coli was starved of niacin , a precursor of nicotinamide adenine dinucleotide (NAD) , the cells elongated and synthesis of DNA was inhibited while syntheses of RNA and protein continued.
The effects of nicotinamide and structural analogs on DNA synthesis were studied in rat hepatoma (HTC) cells.