Oxidoreductase enzyme (EC 1)

Oxidoreductase enzymes represent a large and diverse class (EC 1) of biological catalysts that facilitate oxidation-reduction (redox) reactions, transferring electrons between molecules. They are essential for energy generation, metabolic regulation, cellular redox balance, and detoxification of harmful species. Subtypes include dehydrogenases, oxidases, peroxidases, and oxygenases, each with specific substrate and acceptor profiles. Oxidoreductases often require cofactors such as NAD^+/NADP^+ or FAD. Due to their central role in metabolism, cell signaling, and defense against oxidative stress, oxidoreductases are key targets in drug discovery, diagnostic assays, and studies of disease mechanisms. Precision in naming (defining the exact enzyme) is crucial for clinical and research applications[1][3][10][6][9][12][11][13][15][2][5][7][8][16].

Other names

Reductase (when a substrate is reduced)Oxidase (when oxygen is the acceptor)Dehydrogenase (when hydrogen is transferred)Peroxidase, oxygenase, hydroxylase (common subclasses)GMC oxidoreductase (for specific flavoprotein family)"EC 1" enzymes (EC nomenclature)

Electron donation/acceptance between substrates (redox reaction) Cofactor utilization (NAD^+/NADP^+, FAD) Detoxifying reactive oxygen species (peroxidases, catalases) Drug metabolism via oxidation/reduction