– Essential for the synthesis of various steroid hormones. Participates in the reduction of mitochondrial cytochrome P450 for steroidogenesis. Transfers electrons from adrenodoxin reductase to CYP11A1, a cytochrome P450 that catalyzes cholesterol side-chain cleavage to produce pregnenolone, the precursor of most steroid hormones. Does not form a ternary complex with adrenodoxin reductase and CYP11A1 but shuttles between the two enzymes to transfer electrons. Adrenodoxin, mitochondrial Protein, Bovine, Recombinant (His) is expressed in E. coli expression system with N-10xHis tag. The predicted molecular weight is 19.5 kDa and the accession number is P00257.