| 5-carboxymethyl-2-hydroxymuconate delta-isomerase | <enzyme> Catalyses the isomerization of 5-carboxymethyl-2-hydroxymuconate to yield 5-carboxymethyl-2-oxo-hex-3-ene-1,6-dioate Registry number: EC 5.3.3.10 Synonym: 5-cmhm isomerase, 5-carboxymethyl-2-hydroxymuconate isomerase (26 Jun 1999) |
|---|---|
| 5-dehydroquinate synthetase | <enzyme> Requires nad and ATP Registry number: EC 4.6.1.- (26 Jun 1999) |
| 5-epi-aristolochene synthase | <enzyme> From tobacco; converts farnesyl diphosphate to phyloalexin capsidiol; mw 56,828 kD; a sesquiterpene cyclase Registry number: EC 2.5.1.- (26 Jun 1999) |
| 5-formamidoimidazole-4-carboximide ribotide | An intermediate in purine biosynthesis. (05 Mar 2000) |
| 5-formyl-3-hydroxy-2-methylpyridine-4-carboxylic acid dehydrogenase | <enzyme> Nad+ dependent; from pseudomonas ma-1 grown on pyridoxine; involved in vitamin b6 degradation Registry number: EC 1.1.1.- Synonym: fhmpc dehydrogenase (26 Jun 1999) |
| 5-HIAA | <biochemistry, tumour marker> This is a metabolite of serotonin that is excreted in the urine. Serotonin is a neurotransmitter that is synthesised from the amino acid tryptophan by enterochromaffin cells in the gut and bronchi. It is metabolised to 5-hydroxyindole acetic acid in the liver and then excreted in the urine. Elevations in 5-hydroxyindole acetic acid can indicate carcinoid tumour. The normal range in a 24 hour urine collection is 3 to 15 mg per 24 hours. Acronym: 5-HIAA (13 Nov 1997) |
| 5-HT | <biochemistry, hormone> A neurotransmitter and hormone (176 kD), found in vertebrates, invertebrates and plants. It is synthesised from the amino acid tryptophan by enterochromaffin cells in the gut and bronchi. It is metabolised to 5-HIAA in the liver and then excreted in the urine. Serotonin is measured on a venipuncture specimen in cases of suspected carcinoid syndrome (where it will be elevated). The normal range is 101 to 283 ng/ml. Acronym: 5-HT (13 Nov 1997) |
| 5-hydroxy tryptamine antagonists | Agents which block serotonin receptors and hence interfere with the biological actions of serotonin (5-HT). (05 Mar 2000) |
| 5-hydroxy-N-methylpyroglutamic acid synthetase | <enzyme> Methylamine plus alpha-ketoglutarate gives 5-hydroxy-n-methylpyroglutamic acid Registry number: EC 4.2.1.- (26 Jun 1999) |
| 5-hydroxyeicosanoid dehydrogenase | <enzyme> Nadp-dependent enzyme that catalyses conversion of 5-hete to 5-oxo-6,8,11,14-eicosatetraenoic acid (5-oxo-ete) Registry number: EC 1.1.1.- (26 Jun 1999) |
| 5-hydroxyindole acetic acid | <biochemistry, tumour marker> This is a metabolite of serotonin that is excreted in the urine. Serotonin is a neurotransmitter that is synthesised from the amino acid tryptophan by enterochromaffin cells in the gut and bronchi. It is metabolised to 5-hydroxyindole acetic acid in the liver and then excreted in the urine. Elevations in 5-hydroxyindole acetic acid can indicate carcinoid tumour. The normal range in a 24 hour urine collection is 3 to 15 mg per 24 hours. Acronym: 5-HIAA (13 Nov 1997) |
| 5-hydroxylysine | A hydroxylated amino acid found in certain collagens. The decreased ability to form 5-hydroxylysine is associated with Ehlers-Danlos syndrome type VI. Synonym: d-hydroxylysine. (05 Mar 2000) |
| 5-hydroxytryptamine | <biochemistry, hormone> A neurotransmitter and hormone (176 kD), found in vertebrates, invertebrates and plants. It is synthesised from the amino acid tryptophan by enterochromaffin cells in the gut and bronchi. It is metabolised to 5-HIAA in the liver and then excreted in the urine. Serotonin is measured on a venipuncture specimen in cases of suspected carcinoid syndrome (where it will be elevated). The normal range is 101 to 283 ng/ml. Acronym: 5-HT (13 Nov 1997) |
| 5-hydroxytryptophan | <chemical> Precursor of serotonin used as antiepileptic and antidepressant. Chemical name: Tryptophan, 5-hydroxy- (12 Dec 1998) |
| 5-hydroxytryptophan pyrrolase | <enzyme> 5-hydroxytryptophan and oxygen yield 5-hydroxykynurenine Registry number: EC 1.13.11.- (26 Jun 1999) |