17a,21-Dihydroxypreg-nenolone + Oxygen + Reduced adrenal ferredoxin → 11b,17a,21-Trihydroxypreg-nenolone + Water + Oxidized adrenal ferredoxin
Thumb+Thumb+Reduced adrenal ferredoxinThumb+Thumb+Oxidized adrenal ferredoxin

Enzymes

  1. Cytochrome P450 11B1, mitochondrial