Adrenal ferredoxin (also adrenodoxin (ADX), adrenodoxin, mitochondrial, hepatoredoxin, ferredoxin-1 (FDX1)) is a protein that in humans is encoded by the FDX1gene.[5][6] In addition to the expressed gene at this chromosomal locus (11q22), there are pseudogenes located on chromosomes 20 and 21.
Adrenodoxin is a small iron-sulfur protein that can accept and carry a single electron. Adrenodoxin functions as an electron transfer protein in the mitochondrial cytochrome P450 systems.[7] The first enzyme in this system is adrenodoxin reductase that carries an FAD. FAD can be reduced by two electrons donated from coenzyme NADPH.[8] These two electrons are transferred one a time to adrenodoxin. Adrenodoxin in return reduces mitochondrial cytochrome P450.[7] This particular oxidation/reduction system is involved in the synthesis of steroid hormones in steroidogenic tissues. In addition, similar systems also function in vitamin D and bile acid synthesis in the kidney and liver respectively. Adrenodoxin has been identified in a number of different tissues but all forms have been shown to be identical and are not tissue specific.[6]
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Johnson D, Norman S, Tuckey RC, Martin LL (2004). "Electrochemical behaviour of human adrenodoxin on a pyrolytic graphite electrode". Bioelectrochemistry. 59 (1–2): 41–7. doi:10.1016/s1567-5394(02)00188-3. PMID12699818.
Araya Z, Hosseinpour F, Bodin K, Wikvall K (2003). "Metabolism of 25-hydroxyvitamin D3 by microsomal and mitochondrial vitamin D3 25-hydroxylases (CYP2D25 and CYP27A1): a novel reaction by CYP27A1". Biochim. Biophys. Acta. 1632 (1–3): 40–7. doi:10.1016/S1388-1981(03)00062-3. PMID12782149.
Derouet-Hümbert E, Roemer K, Bureik M (2005). "Adrenodoxin (Adx) and CYP11A1 (P450scc) induce apoptosis by the generation of reactive oxygen species in mitochondria". Biol. Chem. 386 (5): 453–61. doi:10.1515/BC.2005.054. PMID15927889. S2CID37533711.