17β-Hydroxysteroid dehydrogenase 1 (17β-HSD1) is an enzyme that in humans is encoded by the HSD17B1gene.[5][6][7] This enzyme oxidizes or reduces the C17 hydroxy/keto group of androgens and estrogens and hence is able to regulate the potency of these sex steroids
The human 17β-HSD1 isozyme is highly specific for estrogens over androgens whereas the rodent isozyme is less specific.[8]
Discovery
Human 17β-HSD1 was the first enzyme of the 17β-HSD family to be cloned and to have its sequence identified.[9][10] Its three-dimensional structure is also the first example of any human steroid-converting enzyme.[11]
Structure
This enzyme contains a short-chain dehydrogenase domain that contains a characteristic 3-layer (αβα) sandwich known as a Rossmann fold. The human enzyme contains 327 amino acids and exists as a homodimer with two identical subunits of 34.5 kDa [10][12] The N-terminal short-chain dehydrogenase domain contains binding site for the NADP+/NADPH cofactor. A narrow, hydrophobic C-terminal domain contains a binding pocket for the steroid substrate.
Clinical significance
Estradiol stimulates while dihydrotestosterone (DHT) inhibits breast cancer growth. Furthermore 17β-HSD1 levels positively correlate with estradiol and negatively correlate with DHT levels in breast cancer cells. Hence 17β-HSD1 represents a possible drug target for breast cancer treatment.[13]
^Ghosh D, Pletnev VZ, Zhu DW, Wawrzak Z, Duax WL, Pangborn W, Labrie F, Lin SX (May 1995). "Structure of human estrogenic 17 beta-hydroxysteroid dehydrogenase at 2.20 A resolution". Structure. 3 (5): 503–13. doi:10.1016/S0969-2126(01)00183-6. PMID7663947.
^Lin SX, Yang F, Jin JZ, Breton R, Zhu DW, Luu-The V, Labrie F (Aug 1992). "Subunit identity of the dimeric 17 beta-hydroxysteroid dehydrogenase from human placenta". The Journal of Biological Chemistry. 267 (23): 16182–7. PMID1322895.
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Tremblay Y, Ringler GE, Morel Y, Mohandas TK, Labrie F, Strauss JF, Miller WL (Dec 1989). "Regulation of the gene for estrogenic 17-ketosteroid reductase lying on chromosome 17cen----q25". The Journal of Biological Chemistry. 264 (34): 20458–62. PMID2584224.
Nicolas JC, Harris JI (Jan 1973). "Human placental 17 -oestradiol dehydrogenase. Sequence of a tryptic peptide containing an essential cysteine". FEBS Letters. 29 (2): 173–6. doi:10.1016/0014-5793(73)80554-X. PMID4719204. S2CID44967040.
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Murdock GL, Chin CC, Offord RE, Bradshaw RA, Warren JC (Oct 1983). "Human placental estradiol 17 beta-dehydrogenase. Identification of a single histidine residue affinity-labeled by both 3-bromoacetoxyestrone and 12 beta-bromoacetoxy-4-estrene-3,17-dione". The Journal of Biological Chemistry. 258 (19): 11460–4. PMID6578212.
Andersson S, Geissler WM, Patel S, Wu L (Jun 1995). "The molecular biology of androgenic 17 beta-hydroxysteroid dehydrogenases". The Journal of Steroid Biochemistry and Molecular Biology. 53 (1–6): 37–9. doi:10.1016/0960-0760(95)00039-3. PMID7626483. S2CID54417090.
Tremblay MR, Auger S, Poirier D (May 1995). "Synthesis of 16-(bromoalkyl)-estradiols having inhibitory effect on human placental estradiol 17 beta-hydroxysteroid dehydrogenase (17 beta-HSD type 1)". Bioorganic & Medicinal Chemistry. 3 (5): 505–23. doi:10.1016/0968-0896(95)00041-E. PMID7648200.
Ghosh D, Pletnev VZ, Zhu DW, Wawrzak Z, Duax WL, Pangborn W, Labrie F, Lin SX (May 1995). "Structure of human estrogenic 17 beta-hydroxysteroid dehydrogenase at 2.20 A resolution". Structure. 3 (5): 503–13. doi:10.1016/S0969-2126(01)00183-6. PMID7663947.
Sawetawan C, Milewich L, Word RA, Carr BR, Rainey WE (Mar 1994). "Compartmentalization of type I 17 beta-hydroxysteroid oxidoreductase in the human ovary". Molecular and Cellular Endocrinology. 99 (2): 161–8. doi:10.1016/0303-7207(94)90004-3. PMID8206323. S2CID54331976.
Normand T, Narod S, Labrie F, Simard J (Apr 1993). "Detection of polymorphisms in the estradiol 17 beta-hydroxysteroid dehydrogenase II gene at the EDH17B2 locus on 17q11-q21". Human Molecular Genetics. 2 (4): 479–83. doi:10.1093/hmg/2.4.479. PMID8389226.
Zhao Z, Yazdani A, Shen Y, Sun Z, Bailey J, Caskey CT, Lee CC (Sep 1996). "Molecular dissection of a cosmid from a gene-rich region in 17q21 and characterization of a candidate gene for alpha-N-acetylglucosaminidase with two cDNA isoforms". Mammalian Genome. 7 (9): 686–90. doi:10.1007/s003359900206. PMID8703123. S2CID8692823.