| eosinophil chemotactic peptide | <protein> Tetrapeptides (of which two are identified: VGSE and AGSE) released by mast cells and that are said to both attract and activate eosinophils. (18 Nov 1997) |
|---|---|
| UDP-N-acetylglucosamine-peptide beta-N-acetylglucosaminyltransferase | <enzyme> Responsible for the addition of o-linked n-acetylglucosamine to proteins Registry number: EC 2.4.1.- Synonym: udp-glcnac-peptide-glcnac-transferase, glcnac transferase (26 Jun 1999) |
| formyl peptide | <biochemistry> Informal term for small peptides with a formylated N terminal methionine and usually a hydrophobic amino acid at the carboxy terminal end (fMetLeuPhe is the most commonly used). These peptides stimulate the motor and secretory activities of leucocytes, particularly neutrophils and monocytes, that have a specific receptor (about 60 kD) of high affinity (Kd approximately 10exp 8M). Leucocytes show chemotaxis towards formyl peptides but the term chemotactic peptides understates the range of activities the molecules will trigger. Thought to be synthetic analogues of bacterial signal sequences though this is unproven. The leucocytes of many animals (e.g. Pig, cow, chicken) do not respond. (18 Nov 1997) |
| leader peptide | <molecular biology> In the regulation of gene expression for enzymes concerned with amino acid synthesis in prokaryotes, the leader sequence codes for the leader peptide that contains several residues of the amino acid being regulated. Transcription is closely linked to translation and if translation is retarded by limited supply of amino acyl tRNA for the specific amino acid, the mode of transcription of the leader sequence permits full transcription of the operon genes, otherwise complete transcription of the leader sequence prematurely terminates transcription of the operon. (18 Nov 1997) |
| lysergyl peptide synthetase | <enzyme> Multifunctional enzyme which forms non-cyclol d-lysergyl peptide lactams; consists of two polypeptide chains - lps 1 binds the 3 amino acids (ala, phe and pro) of the peptide nucleus and lps 2 binds d-lysergic acid Registry number: EC 6.3.2.- Synonym: d-lysergylpeptide synthetase (26 Jun 1999) |
| abequose synthase | <enzyme> Converts cdp-4-keto-3,6-dideoxy-d-glucose to cdp-3,6-dideoxy-d-galactose (cdp-abequose); requires NADPH, analogous to udp-glucose-4-epimerase Registry number: EC 5.1.3.- Synonym: rfbj gene product (26 Jun 1999) |
| acetoacetyl-acyl carrier protein synthase | <enzyme> E coli enzyme, that catalyses condensation of malonyl-acyl carrier protein plus acetyl-acyl carrier protein; not inhibited by cerulenin Registry number: EC 2.3.1.- Synonym: acetoacetyl-acp synthase (26 Jun 1999) |
| acetolactate synthase | <enzyme> A flavoprotein that catalyses the formation of acetolactate from 2 moles of pyruvate in the biosynthesis of valine and the formation of acetohydroxybutyrate from pyruvate and alpha-ketobutyrate in the biosynthesis of isoleucine. Chemical name: Acetolactate pyruvate-lyase (carboxylating) Registry number: EC 4.1.3.18 (12 Dec 1998) |
| acridone synthase | <enzyme> Catalyses the condensation of n-methylanthraniloyl-CoA and 3 malonyl-CoA to produce 1,3-dihydroxy-n-methylacridone Registry number: EC 2.3.1.- (26 Jun 1999) |
| acyl-malonyl-ACP synthase | <enzyme> An enzyme condensing malonyl-ACP and acyl-cys-protein to 3-oxoacyl-ACP + cys-protein + CO2, and similar reactions, as steps in fatty acid synthesis; cys-protein is also a part of the fatty acid synthase complex. Synonym: acyl-malonyl-ACP synthase, beta-ketoacyl-ACP synthase. (05 Mar 2000) |
| adenylosuccinate synthase | <enzyme> A carbon-nitrogen ligase. During purine ribonucleotide biosynthesis, this enzyme catalyses the synthesis of adenylosuccinate from GTP, imp, and aspartate with the formation of orthophosphate and GDP. Chemical name: IMP:L-aspartate ligase (GDP-forming) Registry number: EC 6.3.4.4 (12 Dec 1998) |
| adenylylosuccinate synthase | <enzyme> A carbon-nitrogen ligase. During purine ribonucleotide biosynthesis, this enzyme catalyses the synthesis of adenylosuccinate from GTP, imp, and aspartate with the formation of orthophosphate and GDP. Chemical name: IMP:L-aspartate ligase (GDP-forming) Registry number: EC 6.3.4.4 (12 Dec 1998) |
| agropine synthase | <enzyme> Final enzyme in the three enzyme pathway for agropine synthesis; cyclises deoxymannityl-glutamine to the lactone, agropine Registry number: EC 4.2.1.- Synonym: ags gene product (26 Jun 1999) |
| alkylglycerone-phosphate synthase | <enzyme> Replaces the acyl moiety of acyldhap with a long chain fatty alcohol; intact alcohol including the oxygen atom is incorporated into alkyl-dhap Registry number: EC 2.5.1.26 Synonym: adhps, alkyl-dihydroxyacetone phosphate synthase, alkyl-dhap synthase, alkyldihydroxyacetone phosphate synthetase, acylglycerone-3-phosphate-long chain-alcohol o-3-phospho-2-oxopropanyl transferase, alkyldihydroxyacetonephosphate synthase (26 Jun 1999) |
| aminoadipic d-saemialdehyde synthase | <enzyme> A bifunctional enzyme used in lysine degradation; it has a lysine:alpha-ketoglutarate reductase activity as well as a saccharopine dehydrogenase activity. A deficiency of this enzyme results in familial hyperlysinaemia. (05 Mar 2000) |