11-Beta hydroxysteroid dehydrogenase

11β-Hydroxysteroid dehydrogenase (HSD-11β or 11β-HSD) is the name of a family of enzymes that catalyze the conversion of inert 11 keto-products (cortisone) to active cortisol, or vice versa,^[1] thus regulating the access of glucocorticoids to the steroid receptors:

11β-hydroxysteroid + NADP⁺

\rightleftharpoons

an 11-oxosteroid + NADPH + H⁺

Thus, the two substrates of this enzyme are 11beta-hydroxysteroid and NADP⁺, whereas its 3 products are 11-oxosteroid, NADPH, and H⁺.

This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-OH group of donor with NAD⁺ or NADP⁺ as acceptor. The systematic name of this enzyme class is 11beta-hydroxysteroid:NADP⁺ 11-oxidoreductase. Other names in common use include corticosteroid 11β-dehydrogenase, β-hydroxysteroid dehydrogenase, 11β-hydroxy steroid dehydrogenase, corticosteroid 11-reductase, and dehydrogenase, 11β-hydroxy steroid. This enzyme participates in c21-steroid hormone metabolism and androgen and estrogen metabolism.

Structural studies

As of late 2007, 8 structures have been solved for this class of enzymes, with PDB accession codes 1XSE, 1XU7, 1XU9, 1Y5M, 1Y5R, 2BEL, 2ILT, and 2IRW.

Function

Cortisol. Note the OH at the 11 position on ring C. (The other differences between the diagrams are not of consequence.)

Cortisone

Cortisol, a glucocorticoid, binds the glucocorticoid receptor. However, because of its molecular similarity to aldosterone it is also capable of binding the mineralcorticoid receptor. Both aldosterone and cortisol have a similar affinity for the mineralocorticoid receptor; however, there is vastly more cortisol in circulation than aldosterone. To prevent over-stimulation of the mineralocorticoid receptor by cortisol, HSD-11β converts the biologically active cortisol to the inactive cortisone, which can no longer bind to the mineralocorticoid receptor. 11β-HSD co-localizes with intracellular adrenal steroid receptors. Licorice, which contains glycyrrhetinic acid, or Carbenoxolone can inhibit 11β-HSD and lead to a mineralocorticoid excess syndrome.

Isoforms

In humans, there are two HSD11B isoforms:^[2]^[3]

HSD11B1	NADPH-dependent	Highly expressed in key metabolic tissues including liver, adipose tissue, and the central nervous system.	In these tissues, HSD11B1 reduces cortisone to the active hormone cortisol that activates glucocorticoid receptors.
HSD11B2	NAD⁺-dependent	Expressed in aldosterone-selective tissues, including kidneys, liver, lungs, colon, salivary glands, HSD2 neurons and placenta.	In these tissues, HSD11B2 oxidizes cortisol to cortisone and prevents illicit activation of the mineralocorticoid receptor.

Inhibition of HSD11B1 has been suggested as a possible therapy for treatment of obesity and metabolic syndrome.^[3]

References

↑ Seckl JR, Walker BR (April 2001). "Minireview: 11beta-hydroxysteroid dehydrogenase type 1- a tissue-specific amplifier of glucocorticoid action". Endocrinology 142 (4): 1371–6. doi:10.1210/en.142.4.1371. PMID 11250914.
↑ Seckl JR (January 1997). "11beta-Hydroxysteroid dehydrogenase in the brain: a novel regulator of glucocorticoid action?". Front Neuroendocrinol 18 (1): 49–99. doi:10.1006/frne.1996.0143. PMID 9000459.
1 2 Anagnostis P, Athyros VG, Tziomalos K, Karagiannis A, Mikhailidis DP (2009). "Clinical review: The pathogenetic role of cortisol in the metabolic syndrome: a hypothesis". The Journal of Clinical Endocrinology and Metabolism 94 (8): 2692–2701. doi:10.1210/jc.2009-0370. PMID 19470627.

Agarwal AK, Monder C, Eckstein B, White PC (1989). "Cloning and expression of rat cDNA encoding corticosteroid 11 beta-dehydrogenase". J. Biol. Chem. 264 (32): 18939–43. PMID 2808402.
Bush IE, Hunter SA, Meigs RA (1968). "Metabolism of 11-oxygenated steroids. Metabolism in vitro by preparations of liver". Biochem. J. 107 (2): 239–58. PMC 1198650. PMID 4384445.
Lakshmi V, Monder C (1988). "Purification and characterization of the corticosteroid 11 beta-dehydrogenase component of the rat liver 11 beta-hydroxysteroid dehydrogenase complex". Endocrinology. 123 (5): 2390–8. doi:10.1210/endo-123-5-2390. PMID 3139396.
Phillips DM, Lakshmi V, Monder C (1989). "Corticosteroid 11 beta-dehydrogenase in rat testis". Endocrinology. 125 (1): 209–16. doi:10.1210/endo-125-1-209. PMID 2661206.

External links

11-beta-Hydroxysteroid Dehydrogenases at the US National Library of Medicine Medical Subject Headings (MeSH)

Oxidoreductases: alcohol oxidoreductases (EC 1.1)

1.1.1: NAD/NADP acceptor	3-hydroxyacyl-CoA dehydrogenase 3-hydroxybutyryl-CoA dehydrogenase Alcohol dehydrogenase Aldo-keto reductase 1A1 1B1 1B10 1C1 1C3 1C4 7A2 Aldose reductase Beta-Ketoacyl ACP reductase Carbohydrate dehydrogenases Carnitine dehydrogenase D-malate dehydrogenase (decarboxylating) DXP reductoisomerase Glucose-6-phosphate dehydrogenase Glycerol-3-phosphate dehydrogenase HMG-CoA reductase IMP dehydrogenase Isocitrate dehydrogenase Lactate dehydrogenase L-threonine dehydrogenase L-xylulose reductase Malate dehydrogenase Malate dehydrogenase (decarboxylating) Malate dehydrogenase (NADP+) Malate dehydrogenase (oxaloacetate-decarboxylating) Malate dehydrogenase (oxaloacetate-decarboxylating) (NADP+) Phosphogluconate dehydrogenase Sorbitol dehydrogenase Hydroxysteroid dehydrogenase: 3 Beta 3-beta-HSD NSDHL 11 Beta HSD11B1 HSD11B2 17 Beta

1.1.2: cytochrome acceptor	D-lactate dehydrogenase (cytochrome) D-lactate dehydrogenase (cytochrome c-553) Mannitol dehydrogenase (cytochrome)

1.1.3: oxygen acceptor	Glucose oxidase L-gulonolactone oxidase Xanthine oxidase

1.1.4: disulfide as acceptor	Vitamin K epoxide reductase Vitamin-K-epoxide reductase (warfarin-insensitive)

1.1.5: quinone/similar acceptor	Malate dehydrogenase (quinone) Quinoprotein glucose dehydrogenase

1.1.99: other acceptors	Choline dehydrogenase L2HGDH

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

Steroidogenesis

To pregnenolone

Side-chain cleavage

To corticosteroids

aldosterone: 18-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 hormone metabolism modulators

20,22-Desmolase	Inhibitors: 22-ABC 3,3′-Dimethoxybenzidine 3-Methoxybenzidine Aminoglutethimide Canrenone Cyanoketone Danazol Etomidate Ketoconazole Mitotane Spironolactone Trilostane

17α-Hydroxylase, 17,20-Lyase	Inhibitors: 22-ABC 22-Oxime Abiraterone Abiraterone acetate Bifonazole Canrenone CFG-920 Clotrimazole Cyanoketone Cyproterone acetate Danazol Econazole Galeterone Gestrinone Isoconazole Ketoconazole L-39 Liarozole LY-207,320 MDL-27,302 Miconazole Mifepristone Orteronel Pioglitazone Prochloraz Rosiglitazone Spironolactone Stanozolol SU-10,603 TGF-β Tioconazole Troglitazone VN/87-1 VT-464 YM116

3α-HSD	Inhibitors: Coumestrol Daidzein Genistein Indomethacin Medroxyprogesterone acetate Inducers: Fluoxetine Fluvoxamine Mirtazapine Paroxetine Sertraline Venlafaxine

3β-HSD	Inhibitors: 4-MA Abiraterone Abiraterone acetate Azastene Cyanoketone Cyproterone acetate Danazol Epostane Genistein Gestrinone Metyrapone Norethisterone Oxymetholone Pioglitazone Rosiglitazone Trilostane Troglitazone

11β-HSD	Inhibitors: 18α-Glycyrrhizic acid ABT-384 Acetoxolone Carbenoxolone Enoxolone (glycyrrhetinic acid) Epigallocatechin gallate Glycyrrhizin (glycyrrhizic acid)

21-Hydroxylase	Inhibitors: Aminoglutethimide Amphenone B Bifonazole Canrenone Clotrimazole Diazepam Econazole Genistein Isoconazole Ketoconazole Metyrapone Miconazole Midazolam Spironolactone Tioconazole

11β-Hydroxylase	Inhibitors: Abiraterone Abiraterone acetate Aminoglutethimide Canrenone Etomidate Fadrozole FETO Ketoconazole Metomidate Metyrapone Mitotane Potassium canrenoate Spironolactone Trilostane

18-Hydroxylase	Inhibitors: Aminoglutethimide Canrenone FAD286 Fadrozole Ketoconazole LCI699 Metyrapone Mespirenone Potassium canrenoate Spironolactone

17β-HSD	Inhibitors: Danazol Simvastatin

5α-Reductase	Inhibitors: 22-Oxime Alfatradiol Azelaic acid β-Sitosterol Bexlosteride Chlormadinone acetate Cl-4AS-1 Dutasteride Epitestosterone Epristeride Fatty acids (α-linolenic acid, linoleic acid, γ-linolenic acid, monolinolein, oleic acid) Finasteride Ganoderic acid Izonsteride L-39 Lapisteride Saw palmetto TFM-4AS-1 Turosteride Vitamin B6 Zinc

Aromatase	Inhibitors: 4-AT 4-Cyclohexylaniline 4-Hydroxytestosterone 5α-DHNET Abyssinone II Aminoglutethimide Anastrozole Ascorbic acid (vitamin C) Atamestane ATD Bifonazole CGP-45,688 CGS-47,645 Chalconoids (e.g., isoliquiritigenin) Corynesidone A Clotrimazole DHT Difeconazole Econazole Ellagitannins Endosulfan Exemestane Fadrozole Fatty acids (e.g., conjugated linoleic acid, linoleic acid, linolenic acid, palmitic acid) Fenarimol Finrozole Flavonoids (e.g., 7-hydroxyflavone, 7-hydroxyflavanone, 7,8-DHF, acacetin, apigenin, baicalein, biochanin A, chrysin, EGCG, gossypetin, hesperetin, liquiritigenin, myricetin, naringenin, pinocembrin, rotenone, quercetin, sakuranetin, tectochrysin) Formestane Imazalil Isoconazole Ketoconazole Letrozole Liarozole Melatonin MEN-11066 Miconazole Minamestane Nimorazole NKS01 Norendoxifen ORG-33,201 Penconazole Phenytoin Prochloraz PGE2 (dinoprostone) Plomestane Prochloraz Propioconazole Pyridoglutethimide Quinolinoids (e.g., berberine, casimiroin, triptoquinone A, XHN22, XHN26, XHN27) Resorcylic acid lactones (e.g., zearalenone) Rogletimide Stilbenoids (e.g., resveratrol) Talarozole Terpenoids (e.g., dehydroabietic acid, (–)-dehydrololiolide, retinol (vitamin A), Δ⁹-THC, tretinoin) Testolactone Tioconazole Triadimefon Triadimenol Troglitazone Valproic acid Vorozole Xanthones (e.g., garcinone D, garcinone E, α-mangostin, γ-mangostin, monodictyochrome A, monodictyochrome B) YM-511 Zinc Inducers: Atrazine Flavonoids (e.g., genistein, quercetin)

27-Hydroxylase	Inhibitors: Anastrozole Bicalutamide Dexmedetomidine Fadrozole Posaconazole Ravuconazole

See also: Androgenics • Estrogenics • Glucocorticoidics • Mineralocorticoidics • Progestogenics

Enzymes

Activity	Active site Binding site Catalytic triad Oxyanion hole Enzyme promiscuity Catalytically perfect enzyme Coenzyme Cofactor Enzyme catalysis Enzyme kinetics Lineweaver–Burk plot Michaelis–Menten kinetics

Regulation	Allosteric regulation Cooperativity Enzyme inhibitor

Classification	EC number Enzyme superfamily Enzyme family List of enzymes

Types	EC1 Oxidoreductases(list) EC2 Transferases(list) EC3 Hydrolases(list) EC4 Lyases(list) EC5 Isomerases(list) EC6 Ligases(list)

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