Summary

Name CYP17A1
Full Name Steroid 17-alpha-hydroxylase/17,20 lyase
Synonyms 17-alpha-hydroxyprogesterone aldolase, 4.1.2.30, CYPXVII, Cytochrome P450 17A1, Cytochrome P450-C17, Cytochrome P450c17, Steroid 17-alpha-monooxygenase | CYP17, S17AH
Primary ID P05093
Links - -
Type protein
Relations 12
Pathways Sex Hormone Biosynthesis
Inhibitors abiraterone acetate; abiraterone; 6-(7-hydroxy-5,6-dihydropyrrolo[1,2-c]imidazol-7-yl)-N-methyl-2-naphthalenecarboxamide
Function A cytochrome P450 monooxygenase involved in corticoid and androgen biosynthesis (PubMed:9452426, PubMed:27339894, PubMed:22266943, PubMed:25301938). Catalyzes 17-alpha hydroxylation of C21 steroids, which is common for both pathways. A second oxidative step, required only for androgen synthesis, involves an acyl-carbon cleavage. The 17-alpha hydroxy intermediates, as part of adrenal glucocorticoids biosynthesis pathway, are precursors of cortisol (PubMed:9452426, PubMed:25301938) (Probable). Hydroxylates steroid hormones, pregnenolone and progesterone to form 17-alpha hydroxy metabolites, followed by the cleavage of the C17-C20 bond to form C19 steroids, dehydroepiandrosterone (DHEA) and androstenedione (PubMed:9452426, PubMed:27339894, PubMed:22266943, PubMed:25301938). Has 16-alpha hydroxylase activity. Catalyzes 16-alpha hydroxylation of 17-alpha hydroxy pregnenolone, followed by the cleavage of the C17-C20 bond to form 16-alpha-hydroxy DHEA. Also 16-alpha hydroxylates androgens, relevant for estriol synthesis (PubMed:27339894, PubMed:25301938). Mechanistically, uses molecular oxygen inserting one oxygen atom into a substrate, and reducing the second into a water molecule, with two electrons provided by NADPH via cytochrome P450 reductase (CPR; NADPH-ferrihemoprotein reductase) (PubMed:9452426, PubMed:27339894, PubMed:22266943, PubMed:25301938).

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Relations

Regulator Mechanism target score
+ down-regulates quantity img/direct_inhibition.png chemical modification 17alpha-hydroxyprogesterone 0.8
Publications: 1 Organism: Homo Sapiens
Tissue: Testis, Zona Fasciculata, Zona Reticulata
Pathways:Sex Hormone Biosynthesis
+ down-regulates img/direct_inhibition.png chemical inhibition CYP17A1 0.8
Publications: 1 Organism: Homo Sapiens
+ up-regulates quantity by expression img/indirect-activation.png transcriptional regulation CYP17A1 0.356
Publications: 1 Organism: Homo Sapiens
Tissue: Ovary
+ down-regulates img/direct_inhibition.png chemical inhibition CYP17A1 0.8
Publications: 1 Organism: Homo Sapiens
+ down-regulates quantity img/direct_inhibition.png chemical modification pregnenolone 0.8
Publications: 1 Organism: Homo Sapiens
Tissue: Testis, Zona Glomerulosa, Zona Fasciculata
Pathways:Sex Hormone Biosynthesis
+ up-regulates quantity img/direct-activation.png chemical modification 17alpha-hydroxyprogesterone 0.8
Publications: 1 Organism: Homo Sapiens
Tissue: Testis, Zona Glomerulosa, Zona Fasciculata
Pathways:Sex Hormone Biosynthesis
+ up-regulates quantity img/direct-activation.png chemical modification androst-4-ene-3,17-dione 0.8
Publications: 1 Organism: Homo Sapiens
Tissue: Testis, Zona Fasciculata, Zona Reticulata
Pathways:Sex Hormone Biosynthesis
+ up-regulates quantity img/direct-activation.png chemical modification dehydroepiandrosterone 0.8
Publications: 1 Organism: Homo Sapiens
Tissue: Testis, Zona Fasciculata, Zona Reticulata
Pathways:Sex Hormone Biosynthesis
+ down-regulates img/direct_inhibition.png chemical inhibition CYP17A1 0.8
Publications: 1 Organism: Homo Sapiens
+ down-regulates quantity img/direct_inhibition.png chemical modification progesterone 0.8
Publications: 1 Organism: Homo Sapiens
Tissue: Testis, Zona Glomerulosa, Zona Fasciculata
Pathways:Sex Hormone Biosynthesis
+ up-regulates quantity img/direct-activation.png chemical modification 17alpha-hydroxypregnenolone 0.8
Publications: 1 Organism: Homo Sapiens
Tissue: Testis, Zona Glomerulosa, Zona Fasciculata
Pathways:Sex Hormone Biosynthesis
+ down-regulates quantity img/direct_inhibition.png chemical modification 17alpha-hydroxypregnenolone 0.8
Publications: 1 Organism: Homo Sapiens
Tissue: Testis, Zona Fasciculata, Zona Reticulata
Pathways:Sex Hormone Biosynthesis