Steroid hydroxylase

Short description: Class of enzymes involved in steroid synthesis

Corticosteroid biosynthetic pathway in rat

A steroid hydroxylase is a class of hydroxylase enzymes involved in the biosynthesis of steroids.[1][2]

## Contents

* 1 See also
* 2 Additional images
* 3 References
* 4 External links

## See also

* Steroidogenic enzyme

## Additional images

* Steroidogenesis

* Steroid nomenclature — numbering of carbons

* Production of DHEA from Cholesterol

## References

1. ↑ Waterman, M. R.; Simpson, E. R. (2022-02-07) (in en), Chapter 3. Mechanisms of Regulation of Steroid Hydroxylase Gene Expression, De Gruyter, pp. 101–152, doi:10.1515/9783112563281-004, ISBN 978-3-11-256328-1, https://www.degruyter.com/document/doi/10.1515/9783112563281-004/html, retrieved 2023-03-17
2. ↑ Waterman, MICHAEL R.; Simpson, EVAN R. (1989-01-01), Clark, JAMES H., ed., "Regulation of Steroid Hydroxylase Gene Expression Is Multifactorial in Nature" (in en), Proceedings of the 1988 Laurentian Hormone Conference, Recent Progress in Hormone Research (Boston: Academic Press) 45: pp. 533–566, doi:10.1016/b978-0-12-571145-6.50016-9, ISBN 978-0-12-571145-6, PMID 2554434, https://www.sciencedirect.com/science/article/pii/B9780125711456500169, retrieved 2023-03-17

## External links

* Steroid+hydroxylases at the US National Library of Medicine Medical Subject Headings (MeSH)

* v
* t
* e

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

Steroidogenesis|

| To pregnenolone|

* Cholesterol side-chain cleavage

|

To corticosteroids|

* aldosterone: 18-Hydroxylase

* cortisol/cortisone: 17α-Hydroxylase
* 11β-HSD
* 1
* 2

* both: 3β-HSD
* 1
* 2
* 21-Hydroxylase
* 11β-Hydroxylase

To sex hormones|

| To androgens|

* 17α-Hydroxylase
* 17,20-Lyase
* 3β-HSD
* 17β-HSD
* 5α-Reductase
* 1
* 2

|

To estrogens|

* Aromatase
* 17β-HSD

Other/ungrouped|

* Steroid metabolism: sulfatase
* Steroid sulfatase
* sulfotransferase
* SULT1A1
* SULT2A1

* Steroidogenic acute regulatory protein
* Cholesterol total synthesis
* Reverse cholesterol transport

* v
* t
* e

Oxidoreductases: dioxygenases, including steroid hydroxylases (EC 1.14)

1.14.11: 2-oxoglutarate|

* Prolyl hydroxylase
* HIF prolyl-hydroxylase
* EGLN1
* EGLN2
* EGLN3
* P4HTM
* Lysyl hydroxylase

1.14.13: NADH or NADPH|

* Flavin-containing monooxygenase
* FMO1
* FMO2
* FMO3
* FMO4
* FMO5
* Nitric oxide synthase
* NOS1
* NOS2
* NOS3
* Cholesterol 7 alpha-hydroxylase
* Methane monooxygenase
* 3A4
* Lanosterol 14 alpha-demethylase
* 24-hydroxycholesterol 7α-hydroxylase

1.14.14: reduced flavin or flavoprotein|

* 19A1
* 2D6
* 2E1

1.14.15: reduced iron-sulfur protein|

* 11B1
* 11B2
* 11A1

1.14.16: reduced pteridine (BH4 dependent)|

* Phenylalanine hydroxylase
* Tyrosine hydroxylase
* Tryptophan hydroxylase

1.14.17: reduced ascorbate|

* Dopamine beta-hydroxylase

1.14.18-19: other|

* Tyrosinase
* Stearoyl-CoA desaturase-1

1.14.99 \- miscellaneous|

* Cyclooxygenase
* Heme oxygenase (HMOX1)
* Squalene monooxygenase
* 17A1
* 21A2
* Ecdysone 20-monooxygenase

* v
* t
* e

Enzymes

Activity|

* Active site
* Binding site
* Catalytic triad
* Oxyanion hole
* Enzyme promiscuity
* Catalytically perfect enzyme
* Coenzyme
* Cofactor
* Enzyme catalysis

Regulation|

* Allosteric regulation
* Cooperativity
* Enzyme inhibitor
* Enzyme activator

Classification|

* EC number
* Enzyme superfamily
* Enzyme family
* List of enzymes

Kinetics|

* Enzyme kinetics
* Eadie–Hofstee diagram
* Hanes–Woolf plot
* Lineweaver–Burk plot
* Michaelis–Menten kinetics

Types|

* EC1 Oxidoreductases (list)
* EC2 Transferases (list)
* EC3 Hydrolases (list)
* EC4 Lyases (list)
* EC5 Isomerases (list)
* EC6 Ligases (list)
* EC7 Translocases (list)

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*[HSD]: Hydroxysteroid dehydrogenase