Summary

Name HSD3B1
Full Name 3 beta-hydroxysteroid dehydrogenase/Delta 5-->4-isomerase type 1
Synonyms 3 beta-hydroxysteroid dehydrogenase/Delta 5-->4-isomerase type I, 3-beta-HSD I, Trophoblast antigen FDO161G | 3BH, HSDB3A
Primary ID P14060
Links - -
Type protein
Relations 5
Pathways Sex Hormone Biosynthesis
Function A bifunctional enzyme responsible for the oxidation and isomerization of 3beta-hydroxy-Delta(5)-steroid precursors to 3-oxo-Delta(4)-steroids, an essential step in steroid hormone biosynthesis. Specifically catalyzes the conversion of pregnenolone to progesterone, 17alpha-hydroxypregnenolone to 17alpha-hydroxyprogesterone, dehydroepiandrosterone (DHEA) to 4-androstenedione, and androstenediol to testosterone. Additionally, catalyzes the interconversion between 3beta-hydroxy and 3-oxo-5alpha-androstane steroids controlling the bioavalability of the active forms. Specifically converts dihydrotestosterone to its inactive form 5alpha-androstanediol, that does not bind androgen receptor/AR. Also converts androstanedione, a precursor of testosterone and estrone, to epiandrosterone (PubMed:1401999, PubMed:2139411). Expected to use NAD(+) as preferred electron donor for the 3beta-hydroxy-steroid dehydrogenase activity and NADPH for the 3-ketosteroid reductase activity (Probable).

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Relations

Regulator Mechanism target score
+ up-regulates quantity img/direct-activation.png chemical modification progesterone 0.8
Publications: 1 Organism: Homo Sapiens
Tissue: Zona Glomerulosa
Pathways:Sex Hormone Biosynthesis
+ up-regulates quantity img/direct-activation.png chemical modification 17alpha-hydroxyprogesterone 0.8
Publications: 1 Organism: Homo Sapiens
Tissue: 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: Zona Reticulata
Pathways:Sex Hormone Biosynthesis
+ up-regulates quantity img/indirect-activation.png HSD3B1 0.2
Publications: 1 Organism: Homo Sapiens
+ up-regulates quantity img/direct-activation.png chemical modification testosterone 0.8
Publications: 1 Organism: Rattus Norvegicus
Tissue: Gonad, Zona Reticulata
Pathways:Sex Hormone Biosynthesis