ID 1.14.14.16 DE steroid 21-monooxygenase. AN CYP21A2. AN cytochrome p450 XXIA1. AN steroid 21-hydroxylase. CA (1) O2 + progesterone + reduced [NADPH--hemoprotein reductase] = CA 21-hydroxyprogesterone + H(+) + H2O + oxidized [NADPH--hemoprotein CA reductase]. CA (2) 17alpha-hydroxyprogesterone + O2 + reduced [NADPH--hemoprotein CA reductase] = 11-deoxycortisol + H(+) + H2O + oxidized [NADPH--hemoprotein CA reductase]. CC -!- for the conversion of progesterone and 17alpha-hydroxyprogesterone to CC their respective 21-hydroxylated derivatives, 11-deoxycorticosterone CC and 11-deoxycortisol. CC -!- Involved in the biosynthesis of the hormones aldosterone and CC cortisol. CC -!- The electron donor is EC 1.6.2.4. CC -!- Formerly EC 1.14.1.8, EC 1.14.99.10 and EC 1.99.1.11. DR P00191, CP21A_BOVIN; Q8WNW0, CP21A_CANLF; Q2LCM1, CP21A_CANLU; DR Q2LA60, CP21A_FELCA; P08686, CP21A_HUMAN; Q2LA59, CP21A_LYNLY; DR P03940, CP21A_MOUSE; P15540, CP21A_PIG ; Q64562, CP21A_RAT ; //