beta-Diphosphopyridine nucleotide

Description

Beta-Diphosphopyridine Nucleotide (NAD+), also known as nicotinamide adenine dinucleotide, is a critical coenzyme and cofactor involved in various metabolic processes.

NAD+ consists of two nucleotides joined through their phosphate groups.
One nucleotide contains an adenine nucleobase, and the other contains a nicotinamide.

Central to metabolism, playing a vital role in oxidation-reduction reactions.
Participates in NAD (oxidized form) - NADH (reduced form) reactions.
Functions as a coenzyme in a wide range of enzymatic reactions.

Definition

ChEBI: β-Nicotinamide adenine dinucleotide (NAD) is the oxidized form of β-Nicotinamide Adenine Dinucleotide. It exists as an anion under normal physio-logic conditions. It is functionally related to a deamido-NAD zwitterion. It is a conjugate base of a NAD(+). It is found widely in nature and is involved in numerous enzymatic reactions in which it serves as an electron carrier by being alternately oxidized (NAD+) and reduced (NADH). (Dorland, 27th ed)

NAD+ therapy is known to boost energy levels and improve reaction times.
Supplementation with NAD+ as part of wellness or exercise routines may aid in muscle development during workouts and support muscle recovery post-workout.

Biochem/physiol Actions

β-Nicotinamide adenine dinucleotide (β-NAD) is an electron carrier and a cofactor, significantly involved in enzyme-catalyzed oxido-reduction processes and many genetic processes. NAD cycles between the oxidized (NAD+) and reduced (NADH) forms to maintain a redox balance necessary for continued cell growth. NAD is also involved in microbial catabolism. β-NAD acts as a substrate for various enzymes in several cellular processes.

Purification Methods

NAD is purified by paper chromatography or better on a Dowex-1 ion-exchange resin. The column is prepared by washing with 3M HCl until free of material absorbing at 260nm, then with water, 2M sodium formate until free of chloride ions and, finally, with water. NAD, as a 0.2% solution in water, is adjusted with NaOH to pH 8, and adsorbed onto the column, washed with water, and eluted with 0.1M formic acid. Fractions with strong absorption at 360nm are combined, acidified to pH 2.0 with 2M HCl, and cold acetone (ca 5L/g of NAD) is added slowly and with constant agitation. It is left overnight in the cold, then the precipitate is collected in a centrifuge, washed with pure acetone and dried under vacuum over CaCl2 and paraffin wax shavings [Kornberg Methods Enzymol 3 876 1957]. It has been purified by anion-exchange chromatography [Dalziel & Dickinson Biochemical Preparations 11 84 1966.] The purity is checked by reduction to NADH (with EtOH and yeast alcohol dehydrogenase) which has 340mn 6220 M-1cm-1. [Todd et al. J Chem Soc 3727, 3733 1957.] [pKa, Lamborg et al. J Biol Chem 231 685 1958.] The free acid crystallises from aqueous Me2CO with 3H2O and has m 140-142o. It is stable in cold neutral aqueous solutions in a desiccator (CaCl2) at 25o, but decomposes at strong acid and alkaline pH. Its purity is checked by reduction with yeast alcohol dehydrogenase and EtOH to NADH and noting the OD at 340nm. Pure NADH (see below) has 340 6.2 x 104 M-1cm-1, i.e. 0.1mole of NADH in 3mL and in a 1cm path length cell has an OD at 340nm of 0.207. [Beilstein 26 IV 3644.]