Essential for the synthesis of various steroid hormones (PubMed:20547883, PubMed:21636783). Participates in the reduction of mitochondrial cytochrome P450 for steroidogenesis (PubMed:20547883, PubMed:21636783). Transfers electrons from adrenodoxin reductase to CYP11A1, a cytochrome P450 that catalyzes cholesterol side-chain cleavage (PubMed:20547883, PubMed:21636783). Does not form a ternary complex with adrenodoxin reductase and CYP11A1 but shuttles between the two enzymes to transfer electrons (By similarity). Binds 1 [2Fe-2S] cluster. E(0) is -448 mV. Interacts with CYP11A1. Highest levels in the adrenal gland (at protein level). Also detected in kidney and testis (at protein level). Belongs to the adrenodoxin/putidaredoxin family.