| 5 alpha-3 alpha-hydroxysteroid dehydrogenase | <enzyme> Androsterone can be substrate Registry number: EC 1.1.1.50 Synonym: 3 alpha-hydroxysteroid dehydrogenase, 3 alpha-hydroxysteroid oxidoreductase, 3 oc-hydroxysteroid dehydrogenase (26 Jun 1999) |
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| 5 alpha-androstane-3 beta,17 beta-diol 6 alpha-hydroxylase | <enzyme> Requires NADPH, found in rat prostatic microsomes Registry number: EC 1.14.13.- Synonym: artdl 6 alpha-hydroxylase (26 Jun 1999) |
| 5 alpha-androstane 3 beta,17 beta-diol 7 alpha-hydroxylase | <enzyme> Requires NADPH, found in rat prostate microsomes Registry number: EC 1.14.13.- Synonym: artdl 7 alpha-hydroxylase (26 Jun 1999) |
| 5 alpha-dihydroprogesterone 3 alpha-hydroxysteroid oxidoreductase | <enzyme> Catalyses conversion of 5 alpha-dihydroprogesterone to 3 alpha -hydroxy-5 alpha-pregnane-20-one Registry number: EC 1.1.1.- Synonym: 5-dp-3 alpha-hso, NADPH-5 alpha-dihydroprogesterone 3 alpha-hydroxysteroid oxidoreductase, alpha-hsor (26 Jun 1999) |
| 5 beta-cholestane-3 alpha,7 alpha-diol 26-hydroxylase | <enzyme> Nadp-dependent Registry number: EC 1.14.13.- (26 Jun 1999) |
| beta-hydroxy-beta-methylglutaryl-CoA | -OOCCH2C(OH)(CH3)CH2COS-CoA;a key intermediate in the synthesis of ketone bodies and of steroids. Synonym: 3-hydroxy-3-methylglutaryl-CoA. Beta-hydroxy-beta-methylglutaryl-lyase, an enzyme, found primarily in liver and rumen epithelium that catalyses the formation of acetyl-CoA and acetoacetate from beta-hydroxy-beta-methylglutaryl-CoA; a key step in ketogenesis; a deficiency of this enzyme leads to episodes of severe metabolic acidosis without ketosis. Beta-hydroxy-beta-methylglutaryl-reductase, an enzyme that catalyses the rate-limiting step of cholesterol biosynthesis, beta-hydroxy-beta-methylglutaryl-CoA + 2NADPH + 2H+ → mevalonate + 2NADP+ + coenzyme A. Beta-hydroxy-beta-methylglutaryl-synthase, an enzyme in mitochondria that catalyses the reaction of acetyl-CoA with acetoacetyl-CoA and water to form beta-hydroxy-beta-methylglutaryl-CoA and coenzyme A, a step required for both ketogenesis and steroidogenesis to occur. (05 Mar 2000) |
| calcium hydroxy apatite | <radiology> All calcification in soft tissues is hydroxyapatite, except cartilage (chondrocalcinosis): calcium pyrophosphate see also: Milwaukee shoulder (12 Dec 1998) |
| chromatin 3'-phosphatase-5'-hydroxy kinase | <enzyme> Hydrolyzes the 3'-phosphate end of a polynucleotide duplex followed by ATP-mediated phosphorylation of the 5'-oh end Registry number: EC 3.1.3.- Synonym: chromatin-phosphatase-hydroxykinase (26 Jun 1999) |
| S-adenosyl-L-methionine-2-octaprenyl-3-methyl-5-hydroxy-6-methoxy-1,4-benzoquinone-O-methyltransferase | <enzyme> Proposed pathway for final reaction in ubiquinone biosynthesis. Registry number: EC 2.1.1.- Synonym: 2-octaprenyl-3-methyl-5-hydroxy-6-methoxy-1,4-benzoquinone methyltransferase, ubig gene product, ubig protein (26 Jun 1999) |
| hydroxy- | <chemistry, prefix> A combining form, also used adjectively, indicating hydroxyl as an ingredient. <chemistry> Hydroxy acid, an organic acid, having (besides the hydroxyl group of the carboxyl radical) an alcoholic hydroxyl group, and thus having the qualities of an alcohol in addition to its acid properties; as, lactic and tartaric acids are hydroxy acids. (29 Oct 1998) |
| hydroxy acid | <chemistry> Any molecule which is an acid and which has a hydroxyl group (an -OH or alcohol group) attached to it. (09 Oct 1997) |
| hydroxy-Y base | <chemical> Chemical name: 1h-imidazo(1,2-a)purine-7-butanoic acid, 4,9-dihydro-beta-hydroxy-alpha-((methoxycarbonyl)amino)-4,6-dimethyl-9-oxo-, methyl ester Synonym: alpha-(carboxyamino)-beta-hydroxy-4,9-dihydro-4,6- dimethyl-9-oxo-1h-imidazo(1,2-a)purine-7-butyric acid dimethyl ester (26 Jun 1999) |
| N-hydroxy-2-acetylaminofluorene N-O-acyltransferase | <enzyme> From rat liver; forms non-mutagenic n-o-acetyl-2-acetylaminofluorene Registry number: EC 2.3.1.- Synonym: n-oh-aaf n-o-acyltransferase, haf-acyltransferase (26 Jun 1999) |
| N-hydroxy-2-acetylaminofluorene reductase | <enzyme> Dehydroxylates n-hydroxy-2-acetylaminofluorene to 2-acetylaminofluorene; can use cysteine, glutathione, dithiothreitol, 2-mercaptoeethanol, NADPH or NADH as electron donor Registry number: EC 1.14.99.- Synonym: n-hydroxy-aaf reductase (26 Jun 1999) |
| N-hydroxy-2-acetylaminofluorene sulfotransferase | <enzyme> From rat liver; forms non-mutagenic n-o-sulfo-2-acetylaminofluorene Registry number: EC 2.8.2.- Synonym: haf-sulfotransferase (26 Jun 1999) |