| ubiquitin-protein ligase | <enzyme> Consists of 3 enzymes; e1 is ubiquitin activating enzyme; e2 transfers activated ubiquitin as an enzyme-ubiquitin thiol ester to e3, which transfers ubiquitin to an intracellular protein; e1 forms both an enzyme-bound cooh-terminal ubiquitin thiolester and a cooh-terminal ubiquitin-adenylatte; ube1y is putative y function in spermatogonial proliferation; ube1x and ube1y encode the e1 enzyme Registry number: EC 6.3.2.19 Synonym: ubiquitin-protein ligase system, ubiquitin-protein-lysine n-omega-ligase, ubiquitin-activating enzyme, ubiquitin-activating enzyme e1, ubiquitination activating enzyme e1, ube1 gene product, rsp5 ubiquitin-protein ligase, npi1 protein, ube1y gene product, ube1x gene product, ikappab-ubiquitin ligase (26 Jun 1999) |
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| UDP-N-acetylmuramoylalanine-D-glutamate ligase | <enzyme> From E coli; catalyses the synthesis of udp-n-acetylmuramoyl-l-alanyl-d-glutamate from ATP and udp-n-acetylmuramoyl-l-alanine and d-glutamate Registry number: EC 6.3.2.9 Synonym: d-glu-adding enzyme, d-glutamic acid adding enzyme, murd gene product (26 Jun 1999) |
| UDP-N-acetylmuramoylalanyl-glutamyl-2,6-diaminopimelate-alanyl-alanine ligase | <enzyme> Reaction: ATP + udp-n-acetylmuramoyl-l-ala-d-glu-2,6 -diaminoheptanedioate d-ala-d-ala = ADP + orthophosphate + udp-n-acetylmuramoyl-l-ala-d-glu-6-carboxy-l-lys-d-ala-d-ala; 454 amino acids, mw 48 kD; from bacteria; final step in synthesis of udp-n-acetylmuramoyl pentapeptide; genbank x62437 Registry number: EC 6.3.2.15 Synonym: udp-n-acetylmuramoyl-alanyl-d-glutamyl-meso-2,6-diaminopimeloyl-d-alanyl-d-alanine synthetase, murf gene product, udp-n-acetylmuramoyl-l-ala-glu-meso-2,6-diaminopimeloyl-ala-ala synthetase (26 Jun 1999) |
| 2,3-dihydroxybenzoate-AMP ligase | <enzyme> Catalyses the conversion of 2,3-dihydroxybenzoate and ATP to form (2,3-dihydroxybenzoyl)adenylate, this acyladenylate remains bound to the enzyme for further reactions in the overall biosynthesis of enterobactin Registry number: EC 6.5.- Synonym: 2,3dhb-AMP ligase, ente gene product (26 Jun 1999) |
| 2,3-dihydroxybenzoate - serine ligase | <enzyme> From E coli; ATP and 2,3-dihydroxybenzoate and serine yields the products of ATP breakdown and n-(2,3-dihydroxybenzoyl)-l-serine; involved in biosynthesis of enterobactin Registry number: EC 6.3.2.14 Synonym: enterochelin synthetase, entf gene product, 2,3-dihydroxybenzoylserine synthetase (26 Jun 1999) |
| 2-aminobenzoate coenzyme A ligase | <enzyme> From a denitrifying pseudomonas sp.; catalyses the formation of CoA thioester of 2-aminobenzoate with the formation of AMP and pyrophosphate from ATP Registry number: EC 6.2.1.- Synonym: 2-ab CoA ligase (26 Jun 1999) |
| 3-hydroxypicolinic acid-AMP ligase | <enzyme> From cell extracts of streptomyces pristinaespiralis; activates the first pristinamycin 1 residue 3-hydroxypicolinic acid; shows 58% nh2-terminal amino acid sequence identity with s. Griseoviridus 3-hpa-activating enzyme; amino acid sequence given in first source (page 709) Registry number: EC 6.3.2.- Synonym: pi synthetase 1, snba protein, pristinamycin I synthetase 1,3-hpa-AMP ligase (26 Jun 1999) |
| 4-hydroxybenzoate coenzyme A ligase | <enzyme> From rhodopseudomonas palustris; involved in anaerobic metabolism of 4-hydroxybenzoate Registry number: EC 6.2.1.- Synonym: 4-hydroxybenzoate-CoA ligase, 4-hb-CoA ligase (26 Jun 1999) |
| formate-tetrahydrofolate ligase | <enzyme> An enzyme that catalyses the formation of 10-formyltetrahydrofolate from formate and tetrahydrofolate in the presence of ATP. This enzyme has been found in pigeon liver, human erythrocytes and some microorganisms. Chemical name: Formate:tetrahydrofolate ligase (ADP-forming) Registry number: EC 6.3.4.3 (12 Dec 1998) |
| leucine-trna ligase | <enzyme> An enzyme that activates leucine with its specific transfer RNA. Chemical name: L-Leucine:tRNA(Leu) ligase (AMP-forming) Registry number: EC 6.1.1.4 (12 Dec 1998) |
| ligase | <enzyme, molecular biology> Major class of enzymes that catalyse the linking together of two molecules (category 6 in the I.U.B.C.E. Nomenclature) for example DNA ligases that link two fragments of DNA by forming a phosphodiester bond. (18 Nov 1997) |
| ligase amplification reaction | <molecular biology> Method for detecting small quantities of a target DNA, with utility similar to PCR. It relies on DNA ligase to join adjacent synthetic oligonucleotides after they have bound the target DNA. Their small size means that they are destabilised by single base mismatches and so form a sensitive test for the presence of mutations in the target sequence. (18 Nov 1997) |
| lipoate-protein ligase | <enzyme> Involved in post-translation modification by n6-lipoylation of lysine residues of the lipoate acyltransferase subunits of 2-oxoglutarate dehydrogenase and pyruvate dehydrogenase complexes Registry number: EC 6.3.2.- Synonym: lipoyl-protein ligase (26 Jun 1999) |
| long-chain-fatty-acid-(acyl-carrier-protein) ligase | <enzyme> Fatty acid, acyl-carrier-protein-sh and ATP gives acyl-(acyl-carrier-protein), AMP and ppi Registry number: EC 6.2.1.20 Synonym: fatty acid-acyl carrier protein ligase (AMP), acyl-(acyl-carrier-protein)synthetase, aacp synthetase, fatty acyl-acyl carrier protein synthase, vibrio harveyi, acyl-(acyl-carrier-protein) synthetase, acyl-acp synthetase (26 Jun 1999) |
| L-phenylglycine-AMP ligase | <enzyme> Catalyses l-phenylglycine-dependent ATP-pyrophosphate exchange; partial amino acid sequence given in first source Registry number: EC 6.3.2.- Synonym: pristinamycin I synthetase 4, pi synthetase 4, snbe protein (26 Jun 1999) |