| holo-ACP synthase | <enzyme> An enzyme catalyzing transfer of the 4'-phosphopantetheinyl residue from CoA to a serine of apo-ACP (acyl carrier protein) to form holo-ACP, releasing adenosine 3',5'-bisphosphate; a required step if fatty acid biosynthesis is to function. (05 Mar 2000) |
|---|---|
| homocitrate synthase | <enzyme> Chemical name: 3-hydroxybutane-1,2,4-tricarboxylate 2-oxoglutarate-lyase (CoA-acetylating) Registry number: EC 4.1.3.21 Synonym: lys1 gene product, nifv gene product (26 Jun 1999) |
| homocysteine cystathionine gamma-synthase | <enzyme> Homocysteine and cystein yield cystathionine and h2s Registry number: EC 4.4.- Synonym: hccg-s (26 Jun 1999) |
| putrescine synthase | <chemical> Plant enzyme which has agmatine iminohydrolase (EC 3.5.3.12), putrescine transcarbamylase (EC 2.1.3.6), ornithine transcarbamylase (EC 2.1.3.3) and carbamate kinase (EC 2.7.2.2) activities Chemical name: synthase, putrescine (26 Jun 1999) |
| sepiapterin synthase | <enzyme> Dihydroneopterin is converted to sepiapterin in the presence of one or more enzymes Registry number: EC 1.1.- (26 Jun 1999) |
| pyrimidodiazepine synthase | <enzyme> Converts pyruvoyl-h4-pterin to pyrimidodiazepine by removal of a methyl group and reduction of a ketone group; requires glutathione Registry number: EC 1.2.4.- Synonym: pda synthase (26 Jun 1999) |
| hydrogenobyrinic acid synthase | <enzyme> Pseudomonas denitrificans enzyme which is proposed to transfer a methyl group from c-11 to c-12 of precorrin-8x Registry number: EC 5.4.99.- Synonym: cobh gene product (26 Jun 1999) |
| 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) |