17Beta Hydroxysteroid dehydrogenase

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17Beta Hydroxysteroid dehydrogenase

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17β-Hydroxysteroid dehydrogenase

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PDB structures

AmiGO / EGO

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Steroidogenesis. 17β-HSD visible at left.

17β-Hydroxysteroid dehydrogenases (17β-HSD), also known as 17-ketosteroid oxidoreductases or simply as 17-ketosteroid reductases (17-KSR), are a group of alcohol oxidoreductases which catalyse the dehydrogenation of 17-hydroxysteroids in steroidogenesis. This includes interconversion of DHEA and androstenediol, androstenedione and testosterone, and estrone and estradiol, respectively.^[1]^[2]

Note that the major reactions catalysed by 17β-HSD (e.g., the conversion of androstenedione to testosterone) are in fact hydrogenation (reduction) rather than dehydrogenation (oxidation) reactions.

Genes

Genes coding for 17β-HSD include:

Clinical significance

Isozyme 3 is responsible for 17-beta-hydroxysteroid dehydrogenase deficiency.

References

^ Labrie F, Luu-The V, Lin SX, et al. (January 1997). "The key role of 17 beta-hydroxysteroid dehydrogenases in sex steroid biology". Steroids 62 (1): 148–58. PMID 9029730. http://linkinghub.elsevier.com/retrieve/pii/S0039128X96001742.
^ Charles G. D. Brook; Daniel Truong, M.D; Peter Clayton; William Carroll, Rosalind Brown (22 September 2011). Brook's Clinical Pediatric Endocrinology. John Wiley & Sons. p. 288. ISBN 978-1-4443-1673-5. http://books.google.com/books?id=Y8nhO6D0k4cC&pg=PA288. Retrieved 29 April 2012.

MeSH 17+beta-Hydroxysteroid+Dehydrogenases

Oxidoreductases: alcohol oxidoreductases (EC 1.1)

1.1.1: NAD/NADP acceptor

Hydroxysteroid dehydrogenase: 3 Beta (3-beta-HSD
NSDHL)
11 Beta (HSD11B1
HSD11B2)
17 Beta

1.1.2: cytochrome acceptor

1.1.3: oxygen acceptor

1.1.4: disulfide as acceptor

1.1.5: quinone/similar acceptor

1.1.99: other acceptors

B
enzm
- 1.1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 10
- 11
- 13
- 14
- 15-18
2.1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
2.7.10
2.7.11-12
3.1
- 2
- 3
- 4
- 5
- 6
- 7
3.1.3.48
3.4.21
- 22
- 23
- 24
4.1
- 2
- 3
- 4
- 5
- 6
5.1
- 2
- 3
- 4
- 99
6.1-3
- 4
- 5-6

Metabolism: lipid metabolism · ketones/cholesterol synthesis enzymes/steroid metabolism

Mevalonate pathway

To HMG-CoA	Acetyl-Coenzyme A acetyltransferase · HMG-CoA synthase (regulated step)

Ketogenesis	HMG-CoA lyase · 3-hydroxybutyrate dehydrogenase · Thiophorase

To Mevalonic acid	HMG-CoA reductase

To DMAPP	Mevalonate kinase · Phosphomevalonate kinase · Pyrophosphomevalonate decarboxylase · Isopentenyl-diphosphate delta isomerase

Geranyl-	Dimethylallyltranstransferase · Geranyl pyrophosphate

To cholesterol

To lanosterol	Farnesyl-diphosphate farnesyltransferase · Squalene monooxygenase · Lanosterol synthase

7-Dehydrocholesterol path	Lanosterol 14α-demethylase · Sterol-C5-desaturase-like · 7-Dehydrocholesterol reductase

Desmosterol path	24-dehydrocholesterol reductase

To Bile acids

Cholesterol 7α-hydroxylase · Sterol 27-hydroxylase

aldosterone: 18-hydroxylase

cortisol/cortisone: 17α-hydroxylase · 11β dehydrogenase (HSD11B1, HSD11B2)

both: 3β dehydrogenase · 21α-hydroxylase · 11β-hydroxylase

To sex hormones

To androgens	17α-hydroxylase/17,20 lyase · 3β dehydrogenase · 17β dehydrogenase · 5α reductase (1,2)

To estrogens	Aromatase

Other/ungrouped

Steroid metabolism: sulfatase (Steroid sulfatase) · sulfotransferase (SULT1A1, SULT2A1)

Steroidogenic acute regulatory protein

M: MET

mt, k, c/g/r/p/y/i, f/h/s/l/o/e, a/u, n, m

k, cgrp/y/i, f/h/s/l/o/e, au, n, m, epon

m(A16/C10),i(k, c/g/r/p/y/i, f/h/s/o/e, a/u, n, m)

M: END

anat/phys/devp/horm

noco(d)/cong/tumr, sysi/epon

proc, drug (A10/H1/H2/H3/H5)

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