EC - Adrenodoxin-NADP+ reductase

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IntEnz Enzyme Nomenclature


Accepted name:
adrenodoxin-NADP+ reductase
Other names:
adrenodoxin reductase
nicotinamide adenine dinucleotide phosphate-adrenodoxin reductase
NADPH:adrenal ferredoxin oxidoreductase
NADPH-adrenodoxin reductase
Systematic name:
reduced adrenodoxin:NADP+ oxidoreductase




A flavoprotein (FAD). The enzyme, which transfers electrons from NADPH to adrenodoxin molecules, is the first component of the mitochondrial cytochrome P450 electron transfer systems, and is involved in the biosynthesis of all steroid hormones.

Links to other databases

Enzymes and pathways: NC-IUBMB , BRENDA , ExplorEnz , ENZYME@ExPASy , KEGG , MetaCyc , UniPathway
Structural data: CSA , EC2PDB
Gene Ontology: GO:0015039
UniProtKB/Swiss-Prot: (10) [show] [UniProt]


  1. Omura, T., Sanders, E., Estabrook, R.W., Cooper, D.Y. and Rosenthal, O.
    Isolation from adrenal cortex of a nonheme iron protein and a flavoprotein functional as a reduced triphosphopyridine nucleotide-cytochrome P-450 reductase.
    Arch. Biochem. Biophys. 117: 660-673 (1966).
  2. Chu, J. W., Kimura, T.
    Studies on adrenal steroid hydroxylases. Molecular and catalytic properties of adrenodoxin reductase (a flavoprotein).
    J. Biol. Chem. 248: 2089-2094 (1973). [PMID: 4144106]
  3. Sugiyama, T., Yamano, T.
    Purification and crystallization of NADPH-adrenodoxin reductase from bovine adrenocortical mitochondria.
    FEBS Lett. 52: 145-148 (1975). [PMID: 235468]
  4. Hanukoglu, I., Jefcoate, C. R.
    Mitochondrial cytochrome P-450sec. Mechanism of electron transport by adrenodoxin.
    J. Biol. Chem. 255: 3057-3061 (1980). [PMID: 6766943]
  5. Hanukoglu, I., Hanukoglu, Z.
    Stoichiometry of mitochondrial cytochromes P-450, adrenodoxin and adrenodoxin reductase in adrenal cortex and corpus luteum. Implications for membrane organization and gene regulation.
    Eur. J. Biochem. 157: 27-31 (1986). [PMID: 3011431]
  6. Hanukoglu, I., Gutfinger, T.
    cDNA sequence of adrenodoxin reductase. Identification of NADP-binding sites in oxidoreductases.
    Eur. J. Biochem. 180: 479-484 (1989). [PMID: 2924777]
  7. Ziegler, G. A., Vonrhein, C., Hanukoglu, I., Schulz, G. E.
    The structure of adrenodoxin reductase of mitochondrial P450 systems: electron transfer for steroid biosynthesis.
    J. Mol. Biol. 289: 981-990 (1999). [PMID: 10369776]

[EC created 1965 as EC, transferred 1972 as EC, transferred 1978 to EC, part transferred 2012 to, modified 2016]