| receptors, antigen, T-cell, alpha-beta | T-cell receptors composed of CD3-associated alpha and beta polypeptide chains and expressed primarily in CD4+ or CD8+ T-cells. Unlike immunoglobulins, the alpha-beta T-cell receptors recognise antigens only when presented in association with major histocompatibility (MHC) molecules. (12 Dec 1998) |
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| receptors, transforming growth factor beta | Cell-surface proteins that bind transforming growth factor beta and trigger changes influencing the behaviour of cells. Two types of transforming growth factor receptors have been recognised. They differ in affinity for different members of the transforming growth factor beta family and in cellular mechanisms of action. Transforming growth factor alpha binds to the same receptors as epidermal growth factor (see receptors, epidermal growth factor-urogastrone). (12 Dec 1998) |
| carotene, beta | An antioxidant which protects cells against oxidation damage that can lead to cancer. Beta-carotene is converted, as needed, to vitamin A. Food sources of beta carotene include vegetables such as carrots, sweet potatoes, spinach and other leafy green vegetables; and fruit such as cantaloupes and apricots. Excessive carotene in the diet can temporarily yellow the skin, a condition called carotenaemia, commonly seen in infants fed largely mushed carrots. (12 Dec 1998) |
| glucan 1,3-beta-glucosidase | <enzyme> Chemical name: exo-1,3-beta-glucanase Registry number: EC 3.2.1.58 Synonym: beta-(1-3)-glucanase, exoglucanase, 1,3-beta-glucanase, antiviral tobacco protein gp35, exo-1,3 beta-d-glucosidase, exg1 gene product, exoglucanase II, beta-1,3-glucanase (26 Jun 1999) |
| glucan endo-1,3-beta-d-glucosidase | <enzyme> An enzyme that hydrolyzes 1,3-beta-d-glucosidic linkages in 1,3-beta-d-glucans including laminarin, paramylon, and pachyman. Chemical name: 1,3-beta-D-Glucan glucanohydrolase Registry number: EC 3.2.1.39 (12 Dec 1998) |
| glucosaminylgalactosylglucosylceramide beta-galactosyltransferase | <enzyme> Attaches galactose in a beta 1-3 bond to form the tetrasaccharide-ceramide Registry number: EC 2.4.1.86 Synonym: lc3 galactosyltransferase, udp-galactose-lc3 galactosyltransferase, lactotriosylceramide galactosyltransferase, glcnac beta1-3 gal beta1-4 glc beta1-cer galactosyltransferase, lactatriaosylceramide beta 1-3-galactosyltransferase (26 Jun 1999) |
| glucosylceramide beta-1-4-galactosyltransferase | <enzyme> Catalyses the formation of lactosylceramide from glucosylceramide and udp galactose; also uses dihexosides as acceptor Registry number: EC 2.4.1.- Synonym: udpgalactose ceramide monohexoside galactosyltransferase, glccer galactosyltransferase, galt-2, udpgalactose-glucosylceramide beta-1-4-galactosyltransferase (26 Jun 1999) |
| glycine-rich beta-glycoprotein | <enzyme> A glycine-rich, heat-labile beta-glycoprotein found in blood. It is a proactivator of complement 3 in the alternate pathway of complement activation. Factor b is converted by factor d to c3 convertase. Registry number: EC 3.4.21.47 (12 Dec 1998) |
| glycine-rich beta-glycoproteinase | <enzyme> A serum protein which during the alternate pathway of complement activation converts the inactive properdin factor b to c3 convertase. Registry number: EC 3.4.21.46 (12 Dec 1998) |
| glycoprotein-N-acetylgalactosamine 3-beta-galactosyltransferase | <enzyme> Forms o-glycan core i; forms galactosyl beta 1,3-n-acetylgalactosaminide mucin Registry number: EC 2.4.1.122 Synonym: udp-galactose-n-acetylgalactosamine-alpha-r beta3-galactosyltransferase, glycoprotein-galnac-galactosyltransferase, gp galnac gal transferase, core I beta3-galactosyltransferase, galnac-1-o-ser or thr 1-3 galactosyltransferase, udp-gal-n-acetylgalactosaminide mucin-beta 1,3-galactosyltransferase, udpgal-nacgm-galactosyltransferase, udp-galactose-alpha-n-acetylgalactosaminide beta 3 galactosyltransferase (26 Jun 1999) |
| glycyrrhizin beta-D-glucuronidase | <enzyme> From eubacterium sp. Found in human intestinal flora; hydrolyzes glycyrrhizin to glycyrrhetic acid Registry number: EC 3.2.1.- Synonym: gbd-glucuronidase (26 Jun 1999) |
| GM2-N-acetyl-beta-D-galactosaminidase | <enzyme> May be an aspect of hexosaminidase a Registry number: EC 3.2.1.- Synonym: gm2-ag-aminidase, ganglioside gm2 hydrolase (26 Jun 1999) |
| chitobiosyldiphosphodolichol beta-mannosyltransferase | <enzyme> Adds mannose from GDP mannose to glcnac-glcnac-pyrophosphoryl-dolichol in beta-1,4 linkage Registry number: EC 2.4.1.- Synonym: dolichyl dip mannosyltransferase, dolichol pathway enzyme III, GDP-mannose-dolichyldiphosphate chitobiose mannosyltransferase, alg1 gene product, dolichyl-diphosphate-n-acetylglucosaminyl2 mannosyltransferase, GDP-man - dol-pp-glcnac2 mannosyltransferase, dolpp-glcnac mannosyltransferase, beta-1,4-mannosyltransferase, asparagine-linked glycosylation gene 1, erc14 gene product (26 Jun 1999) |
| guaiacylglycerol beta-O-4-guaiacyl ether dehydrogenase | <enzyme> Nad+ required; forms the corresponding ketone at the alpha carbon of the glycerol side chain Registry number: EC 1.1.1.- Synonym: gge dehydrogenase (26 Jun 1999) |
| cholestenone 5 beta-reductase | <enzyme> A liver enzyme; may be same protein as EC 1.3.1.3 Registry number: EC 1.3.1.23 Synonym: delta(4)-3-ketosteroid-5 beta reductase, 3-keto-5-beta steroid-nadp+ -delta 4-oxidoreductase, androstenedione 5 beta-reductase, delta(4)-oxosteroid 5 beta-reductase, delta(4)-3-oxosteroid 5beta-reductase (26 Jun 1999) |