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2 progesterone + 2 AH2 + 2 O2
17alpha-hydroxyprogesterone + 16alpha-hydroxyprogesterone + 2 A + 2 H2O
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7-dehydropregnenolone + [reduced NADPH-hemoprotein reductase] + O2
7-dehydro-17alpha-hydroxypregnenolone + [oxidized NADPH-hemoprotein reductase] + H2O
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?
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
?
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?
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
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?
progesterone + 2 NADPH + 2 H+ + 2 O2
androstenedione + acetate + 2 NADP+ + 2 H2O
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reaction via 17alpha-hydroxyprogesterone
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?
progesterone + AH2 + O2
17alpha-hydroxyprogesterone + A + H2O
progesterone + ferrocytochrome b5 + O2
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?
progesterone + reduced acceptor + O2
17alpha-hydroxyprogesterone + acceptor + H2O
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?
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
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a C21-steroid + [reduced NADPH-hemoprotein reductase] + O2
a 17alpha-hydroxy-C21-steroid + [oxidized NADPH-hemoprotein reductase] + H2O
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?
a C21-steroid + [reduced NADPH-hemoprotein reductase] + O2
a 17alpha-hydroxy-C21-steroid + [oxidized NADPH-hemoprotein reductase] + H2O
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?
a C21-steroid + [reduced NADPH-hemoprotein reductase] + O2
a 17alpha-hydroxy-C21-steroid + [oxidized NADPH-hemoprotein reductase] + H2O
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?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
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?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
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?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
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?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
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390123, 390131, 390137, 390145, 680978, 685308, 686511, 688979, 691232, 704824, 716053 -
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?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
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product eliminates at C20,21 acetate to yield dehydroepiandrosterone
?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
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product eliminates at C20,21 acetate to yield dehydroepiandrosterone
?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
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-
product eliminates at C20,21 acetate to yield dehydroepiandrosterone
?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
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product eliminates at C20,21 acetate to yield dehydroepiandrosterone
?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
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product eliminates at C20,21 acetate to yield dehydroepiandrosterone
?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
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cytochrome b5 also as cofactor
?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
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17,20-lyase activity
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?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
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product eliminates at C20,21 acetate to yield dehydroepiandrosterone
?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
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?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
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?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
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?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
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-
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?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
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?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
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-
product eliminates at C20,21 acetate to yield dehydroepiandrosterone
?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
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-
product eliminates at C20,21 acetate to yield dehydroepiandrosterone
?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
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-
product eliminates at C20,21 acetate to yield dehydroepiandrosterone
?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
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?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
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?
pregnenolone + AH2 + O2
17alpha-hydroxypregnenolone + A + H2O
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product eliminates at C20,21 acetate to yield dehydroepiandrosterone
?
pregnenolone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxypregnenolone + [oxidized NADPH-hemoprotein reductase] + H2O
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?
pregnenolone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxypregnenolone + [oxidized NADPH-hemoprotein reductase] + H2O
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?
pregnenolone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxypregnenolone + [oxidized NADPH-hemoprotein reductase] + H2O
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?
pregnenolone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxypregnenolone + [oxidized NADPH-hemoprotein reductase] + H2O
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?
pregnenolone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxypregnenolone + [oxidized NADPH-hemoprotein reductase] + H2O
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?
pregnenolone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxypregnenolone + [oxidized NADPH-hemoprotein reductase] + H2O
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?
progesterone + AH2 + O2
17alpha-hydroxyprogesterone + A + H2O
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?
progesterone + AH2 + O2
17alpha-hydroxyprogesterone + A + H2O
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?
progesterone + AH2 + O2
17alpha-hydroxyprogesterone + A + H2O
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?
progesterone + AH2 + O2
17alpha-hydroxyprogesterone + A + H2O
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?
progesterone + AH2 + O2
17alpha-hydroxyprogesterone + A + H2O
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?
progesterone + AH2 + O2
17alpha-hydroxyprogesterone + A + H2O
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?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + 16alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
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?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + 16alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
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product ratio is 3:1
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progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
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product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
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product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
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-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
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-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
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-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
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?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
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?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
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?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
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-
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
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product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
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-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
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-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
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-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
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-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
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-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
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-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
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-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
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-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
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-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
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-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
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17,20-lyase activity
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-
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
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product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
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?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
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?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
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-
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?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
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-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
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-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
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-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
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-
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
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-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
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-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
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-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
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-
product eliminates at C20,21 acetate to yield androstenedione
?
progesterone + [reduced NADPH-hemoprotein reductase] + O2
17alpha-hydroxyprogesterone + [oxidized NADPH-hemoprotein reductase] + H2O
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-
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
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-
product eliminates at C20,21 acetate to yield androstenedione
?
additional information
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the enzyme catalyzes the key branch point in the metabolic conversion of cholesterol either to androgens and estrogens, or to glucocorticoids
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additional information
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the enzyme catalyzes the key branch point in the metabolic conversion of cholesterol either to androgens and estrogens, or to glucocorticoids
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additional information
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it catalyzes steroid 17alpha-hydroxylase and 17,20-lyase activities in the biosynthesis of androgens, estrogens and cortisol
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additional information
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it catalyzes steroid 17alpha-hydroxylase and 17,20-lyase activities in the biosynthesis of androgens, estrogens and cortisol
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additional information
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it catalyzes steroid 17alpha-hydroxylase and 17,20-lyase activities in the biosynthesis of androgens, estrogens and cortisol
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additional information
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it catalyzes steroid 17alpha-hydroxylase and 17,20-lyase activities in the biosynthesis of androgens, estrogens and cortisol
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additional information
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catalyzes the last step of androgen biosynthesis in both testes and adrenals
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additional information
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CYP17 is a key enzyme in steroid hormone biosynthesis
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additional information
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the enzyme is is essential for the maintenance of normal male and female sexual characteristics, as well as the stress response and mineral balance in all mammals
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additional information
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the enzyme is required for androgen production, genetic regulation, overview
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additional information
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CYP17 is the cytochrome b5 modulated key enzyme for the biosynthesis of androgens, catalyzing the 17alpha-hydroxylation of pregnenolone and progesterone and the subsequent cleavage of the C 20,21-acetyl group to yield the corresponding androgens dehydroepiandrosterone and androstendione
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additional information
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cytochrome P-450 17alpha-hydroxylase-17,20-lyase, CYP17, is a multifunctional enzyme. CYP17 catalyzes at the same active site not only the hydroxylation process but also an acyl-carbon bond cleavage reaction which involves the nucleophilic attack of the ferric-peroxyanion, Fe(III)-O-O-, on the acyl-carbon to furnish a tetrahedral intermediate which fragments, leading to acyl-carbon cleavage
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additional information
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CYP17 is unique due to its ability to catalyze two independent reactions in the same active center, the 17alpha-hydroxylase and 17,20-lyase reactions
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additional information
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the multifunctional enzyme catalyzes the 17alpha-hydroxylation of DELTA4- and DELTA5-steroids progesterone and pregnenolone to form the corresponding 17alpha-hydroxy products through its hydroxylase activity, and a subsequent 17,20-carbon-carbon scission of pregnene-side chain produce the androgens androstenedione and dehydroepiandrosterone
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additional information
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a minor conformation may yield the minor 16alpha-hydroxyprogesterone metabolite from progesterone
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additional information
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a minor conformation may yield the minor 16alpha-hydroxyprogesterone metabolite from progesterone
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additional information
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the enzyme also shows 17,20-lyase activity which is stimulated by cytochrome b5
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additional information
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the bifunctional enzyme catalyzes two types of reactions, namely, a 17alpha-hydroxylation reaction and a 17,20-lyase reaction
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additional information
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it catalyzes steroid 17alpha-hydroxylase and 17,20-lyase activities in the biosynthesis of androgens, estrogens and cortisol
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additional information
?
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it catalyzes steroid 17alpha-hydroxylase and 17,20-lyase activities in the biosynthesis of androgens, estrogens and cortisol
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additional information
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CYP17 existence coincide with that of insulin and demarcated those of glucagon and somatostatin
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additional information
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the enzyme is involved in androstenedione production
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additional information
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the enzyme catalyzes the key branch point in the metabolic conversion of cholesterol either to androgens and estrogens, or to glucocorticoids
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