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16,17-dehydropregnenolone + [reduced NADPH-hemoprotein reductase] + O2
? + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
-
?
16,17-dehydroprogesterone + [reduced NADPH-hemoprotein reductase] + O2
? + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
-
?
17alpha-hydroxyprogesterone + AH2 + O2
?
2 progesterone + 2 AH2 + 2 O2
17alpha-hydroxyprogesterone + 16alpha-hydroxyprogesterone + 2 A + 2 H2O
-
-
-
-
?
5alpha-pregnan-3,20-dione + NADPH + O2
5alpha-pregnan-17alpha-ol-3,20-dione + NADP+ + H2O
-
-
-
-
?
5alpha-pregnan-3alpha-ol-20-one + NADPH + O2
5alpha-pregnan-3alpha,17alpha-diol-20-one + ?
-
-
-
-
?
7-dehydropregnenolone + [reduced NADPH-hemoprotein reductase] + O2
7-dehydro-17alpha-hydroxypregnenolone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
-
?
a C21-steroid + [reduced NADPH-hemoprotein reductase] + O2
a 17alpha-hydroxy-C21-steroid + [oxidized NADPH-hemoprotein reductase] + H2O
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
pregnenolone + ferrocytochrome b5 + O2
?
-
-
-
-
?
pregnenolone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxypregnenolone + [oxidized NADPH-hemoprotein reductase] + H2O
progesterone + 2 AH2 + 2 O2
androstenedione + acetate + 2 A + 2 H2O
via 17alpha-hydroxyprogesterone
-
-
?
progesterone + 2 NADPH + 2 H+ + 2 O2
androstenedione + acetate + 2 NADP+ + 2 H2O
progesterone + AH2 + O2
17alpha-hydroxyprogesterone + A + H2O
progesterone + ferrocytochrome b5 + O2
?
-
-
-
-
?
progesterone + reduced acceptor + O2
17alpha-hydroxyprogesterone + acceptor + H2O
-
-
-
-
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
16alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
-
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + 16alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
additional information
?
-
17alpha-hydroxyprogesterone + AH2 + O2

?
-
-
-
-
?
17alpha-hydroxyprogesterone + AH2 + O2
?
-
-
-
-
?
a C21-steroid + [reduced NADPH-hemoprotein reductase] + O2

a 17alpha-hydroxy-C21-steroid + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
-
?
a C21-steroid + [reduced NADPH-hemoprotein reductase] + O2
a 17alpha-hydroxy-C21-steroid + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
-
-
?
a C21-steroid + [reduced NADPH-hemoprotein reductase] + O2
a 17alpha-hydroxy-C21-steroid + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
-
?
pregnenolone + AH2 + O2

17alpha-hydroxypregnenolone + A + H2O
-
-
-
-
?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
-
-
-
-
?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
-
-
-
?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
-
-
-
?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
-
-
390123, 390131, 390137, 390145, 657657, 680978, 685308, 686511, 688979, 691232, 704824, 716053 -
-
?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
-
-
-
?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
-
-
product eliminates at C20,21 acetate to yield dehydroepiandrosterone
?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
-
-
product eliminates at C20,21 acetate to yield dehydroepiandrosterone
?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
-
-
product eliminates at C20,21 acetate to yield dehydroepiandrosterone
?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
-
-
product eliminates at C20,21 acetate to yield dehydroepiandrosterone
?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
-
product eliminates at C20,21 acetate to yield dehydroepiandrosterone
?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
-
-
cytochrome b5 also as cofactor
?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
-
17,20-lyase activity
-
-
?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
-
-
product eliminates at C20,21 acetate to yield dehydroepiandrosterone
?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
-
-
-
-
?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
-
-
-
-
?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
-
-
-
?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
-
-
-
?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
-
-
-
-
?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
-
-
product eliminates at C20,21 acetate to yield dehydroepiandrosterone
?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
-
-
product eliminates at C20,21 acetate to yield dehydroepiandrosterone
?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
-
-
product eliminates at C20,21 acetate to yield dehydroepiandrosterone
?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
-
-
-
?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
-
-
-
-
?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
-
-
product eliminates at C20,21 acetate to yield dehydroepiandrosterone
?
pregnenolone + [reduced NADPH-hemoprotein reductase] + O2

17alpha-hydroxypregnenolone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
-
?
pregnenolone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxypregnenolone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
-
-
?
pregnenolone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxypregnenolone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
-
?
pregnenolone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxypregnenolone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
-
-
?
pregnenolone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxypregnenolone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
-
?
pregnenolone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxypregnenolone + [oxidized NADPH-hemoprotein reductase] + H2O
via Compound I intermediate
-
-
?
pregnenolone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxypregnenolone + [oxidized NADPH-hemoprotein reductase] + H2O
via the catalytic cycle involving an iron(IV) oxo intermediate
-
-
?
pregnenolone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxypregnenolone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
-
?
pregnenolone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxypregnenolone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
-
-
?
progesterone + 2 NADPH + 2 H+ + 2 O2

androstenedione + acetate + 2 NADP+ + 2 H2O
-
-
-
?
progesterone + 2 NADPH + 2 H+ + 2 O2
androstenedione + acetate + 2 NADP+ + 2 H2O
-
reaction via 17alpha-hydroxyprogesterone
-
-
?
progesterone + AH2 + O2

17alpha-hydroxyprogesterone + A + H2O
-
-
-
-
?
progesterone + AH2 + O2
17alpha-hydroxyprogesterone + A + H2O
-
-
-
-
?
progesterone + AH2 + O2
17alpha-hydroxyprogesterone + A + H2O
-
-
-
-
?
progesterone + AH2 + O2
17alpha-hydroxyprogesterone + A + H2O
-
-
-
-
?
progesterone + AH2 + O2
17alpha-hydroxyprogesterone + A + H2O
-
-
-
-
?
progesterone + AH2 + O2
17alpha-hydroxyprogesterone + A + H2O
-
-
-
-
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2

17alpha-hydroxyprogesterone + 16alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
-
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + 16alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
-
product ratio is 3:1
-
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2

17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
-
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
-
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
isoform P450 17A1 has 3fold higher catalytic efficiency in the 17alpha-hydroxylation of progesterone than pregnenolone
-
-
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
-
-
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
-
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
-
-
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
-
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
-
17,20-lyase activity
-
-
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
via Compound I intermediate
-
-
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
-
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
-
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
-
-
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
-
-
product eliminates at C20,21 acetate to yield androstenedione
?
additional information

?
-
-
the enzyme catalyzes the key branch point in the metabolic conversion of cholesterol either to androgens and estrogens, or to glucocorticoids
-
-
?
additional information
?
-
-
the bifunctional enzyme also exhibits 17,20-lyase activity converting 17alpha-hydroxypregnenolone to dehydroepiandrosterone-S, EC 4.1.2.30, overview
-
-
?
additional information
?
-
enzyme effectively catalyzes hydroxylation reaction for both progesterone and pregnenolone, with 17alpha-hydroxyprogesterone, also 17,20-lyase activity is realized
-
-
?
additional information
?
-
-
the enzyme catalyzes the key branch point in the metabolic conversion of cholesterol either to androgens and estrogens, or to glucocorticoids
-
-
?
additional information
?
-
-
the bifunctional enzyme also exhibits 17,20-lyase activity converting 17alpha-hydroxypregnenolone to dehydroepiandrosterone-S, EC 4.1.2.30, overview
-
-
?
additional information
?
-
P450c17 is an enzyme type that lacks lyase activity
-
-
?
additional information
?
-
-
P450c17 is an enzyme type that lacks lyase activity
-
-
?
additional information
?
-
isoform P450 17A1 also exhibits 17alpha,20-lyase activity
-
-
?
additional information
?
-
isoform P450 17A1 also exhibits 17alpha,20-lyase activity
-
-
?
additional information
?
-
-
isoform P450 17A1 also exhibits 1