NADH

I apologise for any confusion, but there is no such thing as a “NADH enzyme.” NADH (Nicotinamide adenine dinucleotide, reduced form) is a coenzyme that participates in a variety of cellular enzymatic activities. It is NAD+ reduced, which implies it has gained electrons and a hydrogen ion (H+) during metabolic processes.

NADH is a coenzyme that participates in redox processes rather than an enzyme. It functions as an electron carrier, carrying high-energy electrons to other molecules or enzymes. NADH is oxidised back to NAD+ during these reactions, and the electrons liberated are utilised to power cellular functions such as ATP production.

Many enzymes use NADH as a cofactor to perform catalytic activity. Dehydrogenases are among the enzymes that remove hydrogen atoms from molecules, transferring them to NAD+ and producing NADH. Lactate dehydrogenase, which contributes in the conversion of pyruvate to lactate during anaerobic metabolism, and alcohol dehydrogenase, which is involved in alcohol metabolism, are two examples of NADH-dependent enzymes.

Overall, NADH serves as an important electron carrier in cellular metabolism, contributing significantly to energy production and redox processes. It collaborates with particular enzymes that use NADH as a cofactor to perform catalytic actions.