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Name3 beta-hydroxysteroid dehydrogenase/Delta 5-->4-isomerase type 1
Synonyms
  • 3 beta-hydroxysteroid dehydrogenase/Delta 5-->4-isomerase type I
  • 3-beta-HSD I
  • 3BH
  • HSDB3A
  • Trophoblast antigen FDO161G
Gene NameHSD3B1
OrganismHuman
Amino acid sequence
>lcl|BSEQ0036945|3 beta-hydroxysteroid dehydrogenase/Delta 5-->4-isomerase type 1
MTGWSCLVTGAGGFLGQRIIRLLVKEKELKEIRVLDKAFGPELREEFSKLQNKTKLTVLE
GDILDEPFLKRACQDVSVIIHTACIIDVFGVTHRESIMNVNVKGTQLLLEACVQASVPVF
IYTSSIEVAGPNSYKEIIQNGHEEEPLENTWPAPYPHSKKLAEKAVLAANGWNLKNGGTL
YTCALRPMYIYGEGSRFLSASINEALNNNGILSSVGKFSTVNPVYVGNVAWAHILALRAL
QDPKKAPSIRGQFYYISDDTPHQSYDNLNYTLSKEFGLRLDSRWSFPLSLMYWIGFLLEI
VSFLLRPIYTYRPPFNRHIVTLSNSVFTFSYKKAQRDLAYKPLYSWEEAKQKTVEWVGSL
VDRHKETLKSKTQ
Number of residues373
Molecular Weight42251.25
Theoretical pI8.98
GO Classification
Functions
  • steroid delta-isomerase activity
  • 3-beta-hydroxy-delta5-steroid dehydrogenase activity
Processes
  • androgen biosynthetic process
  • glucocorticoid biosynthetic process
  • mineralocorticoid biosynthetic process
  • estrogen biosynthetic process
  • small molecule metabolic process
  • steroid biosynthetic process
  • steroid metabolic process
Components
  • mitochondrial inner membrane
  • endoplasmic reticulum membrane
  • integral component of membrane
  • mitochondrial intermembrane space
  • smooth endoplasmic reticulum membrane
General FunctionSteroid delta-isomerase activity
Specific Function3-beta-HSD is a bifunctional enzyme, that catalyzes the oxidative conversion of Delta(5)-ene-3-beta-hydroxy steroid, and the oxidative conversion of ketosteroids. The 3-beta-HSD enzymatic system plays a crucial role in the biosynthesis of all classes of hormonal steroids. Efficiently catalyzes the transformation of pregnenolone to progesterone, 17-alpha-hydroxypregnenolone to 17-alpha-hydroxyprogesterone, DHEA to 4-androstenedione, dihydrotestosterone to 5-alpha-androstane-3 beta,17 beta-diol, dehydroepiandrosterone to androstenedione and 5-alpha-androstan-3 beta,17 beta-diol to 5-alpha-dihydrotestosterone.
Pfam Domain Function
Transmembrane Regions288-308
GenBank Protein ID306889
UniProtKB IDP14060
UniProtKB Entry Name3BHS1_HUMAN
Cellular LocationEndoplasmic reticulum membrane
Gene sequence
>lcl|BSEQ0010143|3 beta-hydroxysteroid dehydrogenase/Delta 5-->4-isomerase type 1 (HSD3B1)
ATGACGGGCTGGAGCTGCCTTGTGACAGGAGCAGGAGGGTTTCTGGGACAGAGGATCATC
CGCCTCTTGGTGAAGGAGAAGGAGCTGAAGGAGATCAGGGTCTTGGACAAGGCCTTCGGA
CCAGAATTGAGAGAGGAATTTTCTAAACTCCAGAACAAGACCAAGCTGACAGTGCTGGAA
GGAGACATTCTGGATGAGCCATTCCTGAAGAGAGCCTGCCAGGACGTCTCGGTCATCATC
CACACCGCCTGTATCATTGATGTCTTCGGTGTCACTCACAGAGAGTCTATCATGAATGTC
AATGTGAAAGGTACCCAGCTCCTGTTAGAGGCCTGTGTCCAAGCTAGTGTGCCAGTCTTC
ATCTACACCAGTAGCATAGAGGTAGCCGGGCCCAACTCCTACAAGGAAATCATCCAGAAT
GGCCATGAAGAAGAGCCTCTGGAAAACACATGGCCCGCTCCATACCCACACAGCAAAAAG
CTTGCTGAGAAGGCTGTACTGGCGGCTAACGGGTGGAATCTGAAAAACGGCGGCACCCTG
TACACTTGTGCCTTACGACCCATGTATATCTATGGGGAAGGAAGCCGATTCCTTTCTGCT
AGTATAAACGAGGCCCTGAACAACAATGGGATCCTGTCAAGTGTTGGAAAGTTCTCCACT
GTTAACCCAGTCTATGTTGGCAATGTGGCCTGGGCCCACATTCTGGCCTTGAGGGCCCTG
CAGGACCCCAAGAAGGCCCCAAGCATCCGAGGACAGTTCTACTATATCTCAGATGACACG
CCTCACCAAAGCTATGATAACCTTAATTACACCCTGAGCAAAGAGTTCGGCCTCCGCCTT
GATTCCAGATGGAGCTTTCCTTTATCCCTGATGTATTGGATTGGCTTCCTGCTGGAAATA
GTGAGCTTCCTACTCAGGCCAATTTACACCTATCGACCGCCCTTCAACCGCCACATAGTC
ACATTGTCAAATAGCGTATTCACCTTCTCTTATAAGAAGGCTCAGCGAGATCTGGCGTAT
AAGCCACTCTACAGCTGGGAGGAAGCCAAGCAGAAAACGGTGGAGTGGGTTGGTTCCCTT
GTGGACCGGCACAAGGAGACCCTGAAGTCCAAGACTCAGTGA
GenBank Gene IDM27137
GeneCard IDNot Available
GenAtlas IDHSD3B1
HGNC IDHGNC:5217
Chromosome Location1
Locus1p13.1
References
  1. Luu The V, Lachance Y, Labrie C, Leblanc G, Thomas JL, Strickler RC, Labrie F: Full length cDNA structure and deduced amino acid sequence of human 3 beta-hydroxy-5-ene steroid dehydrogenase. Mol Endocrinol. 1989 Aug;3(8):1310-2. 2779585
  2. Lorence MC, Murry BA, Trant JM, Mason JI: Human 3 beta-hydroxysteroid dehydrogenase/delta 5----4isomerase from placenta: expression in nonsteroidogenic cells of a protein that catalyzes the dehydrogenation/isomerization of C21 and C19 steroids. Endocrinology. 1990 May;126(5):2493-8. 2139411
  3. Lorence MC, Corbin CJ, Kamimura N, Mahendroo MS, Mason JI: Structural analysis of the gene encoding human 3 beta-hydroxysteroid dehydrogenase/delta 5----4-isomerase. Mol Endocrinol. 1990 Dec;4(12):1850-5. 2082186
  4. Lachance Y, Luu-The V, Labrie C, Simard J, Dumont M, de Launoit Y, Guerin S, Leblanc G, Labrie F: Characterization of human 3 beta-hydroxysteroid dehydrogenase/delta 5-delta 4-isomerase gene and its expression in mammalian cells. J Biol Chem. 1990 Nov 25;265(33):20469-75. 2243100
  5. Nickson DA, McBride MW, Zeinali S, Hawes CS, Petropoulos A, Mueller UW, Sutcliffe RG: Molecular cloning and expression of human trophoblast antigen FDO161G and its identification as 3 beta-hydroxy-5-ene steroid dehydrogenase. J Reprod Fertil. 1991 Sep;93(1):149-56. 1920284
  6. Dumont M, Luu-The V, Dupont E, Pelletier G, Labrie F: Characterization, expression, and immunohistochemical localization of 3 beta-hydroxysteroid dehydrogenase/delta 5-delta 4 isomerase in human skin. J Invest Dermatol. 1992 Oct;99(4):415-21. 1401999
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