| 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) |
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| 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) |
| non-ribosomal peptide synthase | <enzyme> Nrp - non-ribosomal peptide/polyketide; locus nrp is mutated in a swarming-defective proteus mirabilis strain; 249 amino acid residues, mw 29.7 kD; amimo acid sequence given in first source Registry number: EC 6.3.2.- Synonym: nrpg protein, nrpg gene product (26 Jun 1999) |