| beta-cystathionase | <enzyme> An enzyme catalyzing the hydrolysis of l-cystathionine to pyruvate, l-homocysteine, and NH3. See: cystathionine gamma-lyase. Synonym: beta-cystathionase, cystine lyase. (05 Mar 2000) |
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| beta-d thalassaemia | Thalassaemia due to a gene that depresses synthesis of both beta-and d-globin chains by the chromosome bearing the abnormal gene. Heterozygous state: thalassaemia minor with Hb F comprising 5 to 30% of total haemoglobin but distributed unevenly among cells, Hb A2 reduced or normal. Homozygous state: moderate anaemia with only Hb F present, no Hb A or Hb A2. Synonym: F thalassaemia. (05 Mar 2000) |
| beta-D-fucosidase | <enzyme> Catalyses hydrolysis of terminal non-reducing beta-d-fucose residues in beta-d-fucosides; also hydrolyzes beta-d-galactosides Registry number: EC 3.2.1.38 Synonym: beta-d-fucoside fucohydrolase (26 Jun 1999) |
| beta-d-galactosidase | A sugar-splitting enzyme that catalyses the hydrolysis of lactose into d-glucose and d-galactose, and that of other beta-d-galactosides; it also catalyses galactotransferase reactions; a deficiency of beta-d -galactosidase leads to problems in the intestinal digestion of lactose; used in the production of milk products for adults who do not have the intestinal enzyme; a defect of one isozyme of beta-d-galactosidase is associated with Morquio's syndrome type B. Compare: lactase persistence, lactase restriction. Synonym: lactase. (05 Mar 2000) |
| beta-D-galactoside alpha 2-6-sialyltransferase | <enzyme> Catalyses the reaction of cmp-n-acetylneuraminate and galactosylglycoprotein to yield cmp and n-acetylneuraminylgalactosylglycoprotein; cd75 and cd75w antigen were removed as sys - it is not equivalent to the enzyme. Registry number: EC 2.4.99.1 Synonym: cmp-n-acetylneuraminate-d-galactosyl-glycoprotein n-acetylneurainyltransferase, cmp-n-acetylneuraminate-beta-galactoside alpha-2,6-sialyltransferase, beta-galactosyl(1-4)n-acetylglucosaminide alpha(2-6)-sialyltransferase, gal-glcnac(2-6)-sialyltransferase, cmp-n-acetylneuraminic acid-lactose sialytransferase, cmp-acetylneuraminate galactoside (alpha 2-6)-sialyltransferase, cmp-n-acetylneuraminate-galactosylglycoprotein sialyltransferase, alpha 2-6-sialyltransferase, cmp-sialic acid-n-acetyllactosaminide alpha (2-6)-sialyltransferase, cmp-neuac-galactoside (alpha 2-6)-sialyltransferase, gal-1-4-glcnac alpha(2-6)-sialyltransferase, siat-1, beta-galctoside alpha2,6-sialyltransferase (26 Jun 1999) |
| beta-d-glucosidase | A glucohydrolase similar to alpha-d-glucosidase, but attacking beta-glucosides and releasing beta-d-glucose. Synonym: amygdalase, cellobiase, gentiobiase. (05 Mar 2000) |
| beta-d-glucuronidase | <enzyme> An enzyme catalyzing the hydrolysis of various beta-d-glucuronides, liberating free d-glucuronic acid and an alcohol; a deficiency of this enzyme is associated with Sly syndrome. Synonym: glusulase, glycuronidase. (05 Mar 2000) |
| beta-d-glucuronidase deficiency | A rare deficiency of beta-d-glucuronidase; an autosomal recessive disorder with several allelic forms, characterised by abnormal mucopolysaccharide metabolism leading to progressive mental deterioration, splenic and hepatic enlargement, and dysostosis multiplex. Synonym: mucopolysaccharidase. (05 Mar 2000) |
| beta-D-mannosidase | <enzyme> Catalyses hydrolysis of terminal, non-reducing beta-d-mannose residues in beta-d-mannosides Registry number: EC 3.2.1.25 Synonym: mannanase, beta-mannosidase, mana gene product (26 Jun 1999) |
| beta-DNA | <molecular biology> The normal form of DNA found in organisms, which exists as a right-handed helix. (09 Oct 1997) |
| beta-endorphin | <chemical> A peptide consisting of amino acid sequence 61-91 of the endogenous pituitary hormone beta-lipotropin. The first four amino acids show a common tetrapeptide sequence with methionine- and leucine enkephalin. The compound shows opiate-like activity. Injection of beta-endorphin induces a profound analgesia of the whole body for several hours. This action is reversed after administration of naloxone. Chemical name: beta-Endorphin (12 Dec 1998) |
| beta-farnesene | 7,11-Dimethyl-3-methylene-1,6,10-dodecatriene;one of the two isomers (trans) that occurs in the alarm pheromone of some aphids and also in various essential oils. (05 Mar 2000) |
| beta-farnesene synthase | <enzyme> Catalyses conversion of farnesyl diphosphate to beta-farnesene; genbank af024615 Registry number: EC 3.6.1.- (26 Jun 1999) |
| beta-fructofuranosidase | Beta-h-Fructosidase;an enzyme hydrolyzing beta-d-fructofuranosides and releasing free d-fructose; if the substrate is sucrose, the product is d-glucose plus d-fructose (invert sugar); invert sugar is more easily digestible than sucrose. Synonym: invertase, invertin, saccharase. (05 Mar 2000) |
| beta-galactanase | <enzyme> Appears around day 7 of embryo development of the mollusc pomacea sp; responsible for the degradation of acidic beta-galactan to galactose and di- and tri-galactosides; see also exo-1,4-beta-galactanase and endo-1,4-beta galactanase Registry number: EC 3.2.1.- (26 Jun 1999) |
| xyloglucan endo(1-4)-beta-D-glucanase | <enzyme> Hydrolyzes only xyloglucans Registry number: EC 3.2.1.- Synonym: xyloglucanase (26 Jun 1999) |
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| xylosylprotein 4-beta-galactosyltransferase | <enzyme> Catalyses the second glycosyl transfer reaction in the assembly of the dermatan sulfate chain Registry number: EC 2.4.1.133 Synonym: galactosyltransferase i (26 Jun 1999) |
| short-chain beta-hydroxyacyl-CoA dehydrase | <enzyme> Forms trans-2-enoyl-CoA; maximal activity with trans-2-hexenoyl-CoA, followed by crotonyl-CoA; not the same as EC 4.2.1.17 Registry number: EC 4.2.1.- Synonym: beta-hydroxybutyryl-CoA dehydrase, short-chain beta-hydroxyacyl-coenzyme a dehydrase (26 Jun 1999) |
| hyper-beta-alaninaemia | Elevated levels of beta-alanine in the serum; believed to be due to a deficiency of beta-alanine:pyruvate aminotransferase; leads to impaired CNS function. (05 Mar 2000) |
| hyper-beta-aminoisobutyric aciduria | Elevated levels of beta-aminoisobutyric acid in the urine; believed to be due to a deficiency of liver R-beta-aminoisobutyrate:pyruvate aminotransferase. (05 Mar 2000) |
| N6-acetyl-beta-lysine transaminase | <enzyme> Involved in oxidative catabolism of lysine by candida maltosa; forms 2-keto-6-acetamidocaproate Registry number: EC 2.6.1.65 Synonym: n6-acetyllysine transaminase, acl-at, n6-acetyllysine 2-oxoglutarate aminotransferase (26 Jun 1999) |
| N-acetylglucosamine 4-beta-galactosyltransferase | <enzyme> From schistosoma mansoni Registry number: EC 2.4.1.- Synonym: glcnac-4-galactosyltransferase (26 Jun 1999) |
| N-acetyllactosaminide beta-1,6-N-acetylglucosaminyltransferase | <enzyme> From novikoff ascites tumour cells; asialo-alpha 1-acid glycoprotein acts as acceptor; involved in blood group I antigen synthesis Registry number: EC 2.4.1.150 Synonym: udpgnac 1-6 transferase, udp n-acetyllactosaminide beta-1-6 n-acetylglucosaminyl transferase (26 Jun 1999) |
| N-acetylneuraminylgalactosylglucosylceramide beta-1,4-N-acetylgalactosaminyltransferase | <enzyme> Requires mn2+; only substances containing sialic acid residues can act as acceptors; bovine fetuin is the best aceptor tested Registry number: EC 2.4.1.165 Synonym: neuacgal-1,4-galnactransferase, udp-galnac-neuacalpha2,3galbeta-r(galnac to gal)beta1,4-n-acetylgalactosaminyltransferase (26 Jun 1999) |
| N-benzoyl-beta-D-glucosaminidase | <enzyme> Splits 4-nitrophenyl-2-benzamido-2-deoxy-beta-d-glucopyranoside from liver of the scallop mizuhopecten yessoensis Registry number: EC 3.2.1.- (26 Jun 1999) |
| neocarratetraose 4-O-monosulfate beta-hydrolase | <enzyme> Hydrolyzes the beta-glycoside linkage to give neocarrabiose and neocarrabiose 4-o-sulfate Registry number: EC 3.2.1.- Synonym: nctms hydrolase (26 Jun 1999) |
| steroid 11 beta-monooxygenase | <enzyme> A steroid hydroxylase system found in adrenal tissues. It catalyses the 11-hydroxylation of steroids in the presence of molecular oxygen and consists of an NADPH-specific flavoprotein, a non-haem iron protein, and cytochrome p-450. Its deficiency is a cause of congenital adrenal hyperplasia (adrenal hyperplasia, congenital). Chemical name: Steroid, reduced-adrenal-ferredoxin:oxygen oxidoreductase (11 beta-hydroxylating) Registry number: EC 1.14.15.4 (12 Dec 1998) |
| steroid 15-beta-hydroxylase | <enzyme> Contains p-450 and ferredoxin; from bacillus megaterium Registry number: EC 1.14.99.- Synonym: cytochrome p-450 15 beta-hydroxylase, p-450 (15-beta), steroid-15 beta-monooxygenase, cytochrome p-450meg, cytochrome p4502c12, cyp2c12 protein (26 Jun 1999) |
| sterol 3-beta-glucosyltransferase | <enzyme> A plasma membrane-bound enzyme that catalyses the glucosylation of plant sterols; reaction: sterol + udp-glucose = steryl-3-beta-glucoside + udp Registry number: EC 2.4.1.173 Synonym: udp-glucose sterol beta-d-glucosyltransferase, udpg-sgtase, udp-glucose-sterol-beta-glucosyltransferase (26 Jun 1999) |
| Sulfolobus solfataricus beta-glycosidase | <enzyme> Has broad specificity against beta(1-4), beta(1-3), and beta(1-6)-o-glucosides and hydrolyzes oligosaccharides from the non-reducing end; amino acid sequence given in first source;swiss-prot p22498 Registry number: EC 3.2.1.- Synonym: ssbeta-gly, beta-glycosidase, sulfolobus (26 Jun 1999) |