| 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) |
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| 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) |
| 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) |
| 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) |