NADPH dehydrogenase

This enzyme belongs to the family of oxidoreductases, specifically those acting on NADH or NADPH with other acceptors. The systematic name of this enzyme class is NADPH:acceptor oxidoreductase. Other names in common use include NADPH2 diaphorase, NADPH diaphorase, OYE, diaphorase, dihydronicotinamide adenine dinucleotide phosphate dehydrogenase, NADPH-dehydrogenase, NADPH-diaphorase, NADPH2-dehydrogenase, old yellow enzyme, reduced nicotinamide adenine dinucleotide phosphate dehydrogenase, TPNH dehydrogenase, TPNH-diaphorase, triphosphopyridine diaphorase, triphosphopyridine nucleotide diaphorase, NADPH2 dehydrogenase, and NADPH:(acceptor) oxidoreductase. It has 2 cofactors: FAD, and FMN.

NADPH is produced by the "Malate dehydrogenase (oxaloacetate-decarboxylating) (NADP+)" for the 60% and by the pentose phosphate pathway (also knew as "Shunt of pentoses") for the 40% .

Role in metabolism: The main role of NADPH in human organism is the synthesis of lipids and the detoxification of the organism, in collaboration with the Cytochrome P450 to produce some ROS (Reactives Oxygen Species).

References

Boyer, P.D., Lardy, H. and Myrback, K. (Eds.), The Enzymes, 2nd ed., vol. 7, Academic Press, New York, 1963, p. 477-494.
AVRON M, JAGENDORF AT (1957). "Some further investigations on chloroplast TPNH diaphorase". Arch. Biochem. Biophys. 72 (1): 17–24. doi:10.1016/0003-9861(57)90169-8. PMID 13471057.
Jagendorf AT (1963). "Chloroplast TPNH diaphorase". Methods Enzymol. 6: 430–434. doi:10.1016/0076-6879(63)06200-5.
Theorell H (1935). "Das gelbe Oxydationsferment". Biochem. Z. 278: 263–290.
Theorell H and Akesson A (1956). "Molecular weight and FMN content of crystalline "old yellow enzyme"". Arch. Biochem. Biophys. 65 (1): 439–448. doi:10.1016/0003-9861(56)90204-1. PMID 13373435.
Walter F. Boron, Emile L. Boulpaep (2008). Medical Physiology.

Oxidoreductases: NADH or NADPH (EC 1.6)

1.6.1: NAD/NADP	NAD(P)⁺ transhydrogenase (Si-specific) NAD(P)⁺ transhydrogenase (Re/Si-specific)

1.6.2: Heme	Methemoglobin reductase NADPH—hemoprotein reductase/Cytochrome P450 reductase NADPH—cytochrome-c2 reductase Leghemoglobin reductase

1.6.3: Oxygen	NADPH oxidase P91-PHOX Neutrophil cytosolic factor 1 Neutrophil cytosolic factor 2 Neutrophil cytosolic factor 4 dual oxidase Dual oxidase 1 Dual oxidase 2

1.6.5: Quinone or similar	NADH dehydrogenase

1.6.6: Nitrogenous group	Trimethylamine-N-oxide reductase

1.6.99: other	NADH dehydrogenase (quinone)

Enzymes

Activity	Active site Binding site Catalytic triad Oxyanion hole Enzyme promiscuity Catalytically perfect enzyme Coenzyme Cofactor Enzyme catalysis Enzyme kinetics Lineweaver–Burk plot Michaelis–Menten kinetics

Regulation	Allosteric regulation Cooperativity Enzyme inhibitor

Classification	EC number Enzyme superfamily Enzyme family List of enzymes

Types	EC1 Oxidoreductases(list) EC2 Transferases(list) EC3 Hydrolases(list) EC4 Lyases(list) EC5 Isomerases(list) EC6 Ligases(list)

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