| hydrogen-transporting ATP synthase | <enzyme> A group of enzymes which are involved in the reversible synthesis of ATP and that transport protons from the cytoplasmic to the matrix side of the mitochondrial membrane. The flow of protons through the f(0) channel results in ATP synthesis by f1. Chemical name: ATP phosphohydrolase (H+-transporting) Registry number: EC 3.6.1.34 (12 Dec 1998) |
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| hydroxymethylbilane synthase | <enzyme> An enzyme that catalyses the formation of hydroxymethylbilane from four molecules of porphobilinogen. Chemical name: Porphobilinogen ammonia-lyase (polymerizing) Registry number: EC 4.3.1.8 (12 Dec 1998) |
| hydroxymethylglutaryl-CoA synthase | <enzyme> An enzyme that catalyses the synthesis of hydroxymethylglutaryl-CoA from acetyl-CoA and acetoacetyl-CoA. This is a key enzyme in steroid biosynthesis. Chemical name: (S)-3-Hydroxy-3-methylglutaryl-CoA acetoacetyl-CoA-lyase (CoA-acetylating) Registry number: EC 4.1.3.5 (12 Dec 1998) |
| S-linalool synthase | <enzyme> Converts geranylpyrophosphate via a linalyl cation and addition of h2o to form the monoterpene s-linalool (3,7-dimethylocta-1,6-dien-3-ol) Registry number: EC 4.2.1.- (26 Jun 1999) |
| spermidine synthase | <enzyme> An enzyme that catalyses the transfer of the propylamine moiety from 5'-deoxy-5'-s-(3-methylthiopropylamine)sulfonium adenosine to putrescine in the biosynthesis of spermidine. The enzyme has a molecular weight of approximately 73,000 kD and is composed of two subunits of equal size. Chemical name: S-Adenosylmethioninamine:putrescine 3-aminopropyltransferase Registry number: EC 2.5.1.16 (12 Dec 1998) |
| spermine synthase | <enzyme> An enzyme that catalyses the transfer of the propylamine moiety from 5'-deoxy-5'-s-(3-methylthiopropylamine)sulfonium adenosine to spermidine in the biosynthesis of spermine. It has an acidic isoelectric point at pH 5.0. Chemical name: S-Adenosylmethioninamine:spermidine 3-aminopropyltransferase Registry number: EC 2.5.1.22 (12 Dec 1998) |
| N(5)-(carboxyethyl)ornithine synthase | <enzyme> From lactococcus lactis k1; NADPH-dependent; catalyses the synthesis of n5-ceo from pyruvic acid and l-ornithine Registry number: EC 1.5.1.24 Synonym: nceo synthase (26 Jun 1999) |
| n-acetyllactosamine synthase | <enzyme> The a protein of the lactose synthase complex. In the presence of the b protein (lactalbumin) specificity is changed from n-acetylglucosamine to glucose. Chemical name: UDPgalactose:N-acetyl-D-glucosamine 4-beta-D-galactosyltransferase Registry number: EC 2.4.1.90 (12 Dec 1998) |
| squalene synthase | <enzyme> An enzyme that catalyses the formation of squalene from two molecules of farnesylpyrophosphate using NADPH and concomitant production of two molecules of pyrophosphate. (05 Mar 2000) |
| S-sulfocysteine synthase | <enzyme> Substrates are o-acetylserine and thiosulfate Registry number: EC 4.- Synonym: cysteine synthase b (26 Jun 1999) |
| starch synthase | <enzyme> An enzyme that catalyses the transfer of glucose from adpglucose to glucose-containing polysaccharides in 1,4-alpha-linkages. Chemical name: ADPglucose:1,4-alpha-D-glucan 4-alpha-D-glucosyltransferase Registry number: EC 2.4.1.21 (12 Dec 1998) |
| sterolglucoside synthase | <enzyme> Involved in formation of sterolglucoside in saccharomyces cerevisiae from udpglucose; specific structure of product not given; consider also EC 2.4.1.173, sterol 3beta-glucosyltransferase Registry number: EC 2.4.1.- (26 Jun 1999) |
| stilbene synthase | <enzyme> Extract from pine seedlings catalyzed the conversion of cinnamoyl-CoA and malonyl-CoA into 3,5-dihydroxystilbene Chemical name: synthase, stilbene Registry number: EC 2.3.1.- Synonym: pinosylvine synthase, dihydropinosylvine synthase (26 Jun 1999) |
| N-formimidoyl fortimicin A synthase | <enzyme> An oxidase that converts fortimicin a and glycine to n-formimidoyl fortimicin a; requires o2 and fad Registry number: EC 1.4.3.- Synonym: fi-ftmase, fms 14 gene product (26 Jun 1999) |
| nitric oxide synthase | <enzyme> An enzyme that catalyses the conversion of l-arginine, NADPH, and oxygen to citrulline, nitric oxide, and NADP+. The enzyme found in brain, but not that induced in lung or liver by endotoxin, requires calcium.There are two isoforms, one constitutive and one activated by calmodulin. Chemical name: L-Arginine,NADPH:oxygen oxidoreductase (nitric-oxide-forming) Registry number: EC 1.14.13.39 Acronym: NOS (12 Dec 1998) |