| 3,3'-dichlorobenzidine | <chemical> 3,3'-dichloro-4,4'-diaminodiphenyl. A material used in the manufacture of azo dyes that is toxic to skin and carcinogenic in several species. Pharmacological action: carcinogens. Chemical name: (1,1'-Biphenyl)-4,4'-diamine, 3,3'-dichloro- (12 Dec 1998) |
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| 3,4-dihydroxy-5-hexaprenylbenzoate methyltransferase | <enzyme> Yeast coq3, the 3,4-dihydroxy-5-hexaprenylbenzoate gene encodes the above enzyme; may be required for the biosynthesis of ubiquinone; amino acid sequence given in first source Registry number: EC 2.1.1.- Synonym: dhhb methyltransferase (26 Jun 1999) |
| 3,4-dihydroxybenzoate decarboxylase | <enzyme> Catalyses the conversion of catechol to 3,4-dihydroxybenzoate; an oxygen-sensitive, reversible enzyme; isolated from clostridium hydroxybenzoicum Registry number: EC 4.1.1.63 (26 Jun 1999) |
| 3,4-dihydroxyphenylacetic acid | <chemical> 3,4-dihydroxyphenylacetic acid. A metabolite of l-dopa. Chemical name: Benzeneacetic acid, 3,4-dihydroxy- (12 Dec 1998) |
| 3,4-dihydroxyphenylalanine | An amino acid derived from the amino acid tyrosine. It is formed as the first intermediate in the production of dopamine, a neurotransmitter. (09 Oct 1997) |
| 3,4-dihydroxyphenylserine aldolase | <enzyme> From human brain; cleaves dops into protocatechualdehyde and glycine; requires pyridoxal phosphate for maximal activity Registry number: EC 4.1.2.- Synonym: dops aldolase, l-threo-3,4-dihydroxyphenylserine aldolase (26 Jun 1999) |
| 3,4-dihydroxyxanthone dioxygenase | <enzyme> Forms 4-hydroxy-3-(2'-oxo-3-trans-butenoate)coumarin Registry number: EC 1.13.11.- Synonym: 3,4-dhx dioxygenase (26 Jun 1999) |
| 3,4-methylenedioxyamphetamine | <chemical> An amphetamine derivative that inhibits uptake of catecholamine neurotransmitters. It is a hallucinogen. It is less toxic than its methylated derivative but in sufficient doses may still destroy serotonergic neurons and has been used for that purpose experimentally. Pharmacological action: adrenergic uptake inhibitors, hallucinogens, serotonin agents. Chemical name: 1,3-Benzodioxole-5-ethanamine, alpha-methyl- (12 Dec 1998) |
| 3,4-methylenedioxymethamphetamine | A centrally active phenethylamine derivative related to amphetamine and methamphetamine, with central nervous system excitant and hallucinogenic properties. Synonym: 3,4-methylenedioxymethamphetamine. (05 Mar 2000) |
| 3,5,3'-triiodothyronine | A thyroid hormone normally synthesised in smaller quantities than thyroxine; present in blood and in thyroid gland and exerts the same biological effects as thyroxine but, on a molecular basis, is more potent and the onset of its effect is more rapid. (05 Mar 2000) |
| 3,5-cyclohexadiene-1,2-diol-1-carboxylate dehydrogenase | <enzyme> Catalyses the oxidation of 3,5-cyclohexadiene-1,2-diol-1-carboxylate in presence of nad to yield catechol, carbon dioxide and NADH Registry number: EC 1.3.1.25 Synonym: dihydrodihydroxybenzoate dehydrogenase (26 Jun 1999) |
| 3,5-dichlorocatechol 1,2-dioxygenase | <enzyme> A nonheme iron dioxygenase involved in biodegradation of the herbicide 2,4-dichlorophenoxyacetic acid; forms 2,4-dichloro-cis,cis-muconic acid Registry number: EC 1.13.11.- (26 Jun 1999) |
| 3,5-xylenol methylhydroxylase | <enzyme> Requires NADH Registry number: EC 1.13.- (26 Jun 1999) |
| 3,6-anhydrogalactose | A galactose derivative found in a number of polysaccharides (e.g., agarose). (05 Mar 2000) |
| 3,6-diaminohexanoate aminomutase | <enzyme> Catalyses the isomerization of 3,6-diaminohexanoate to 3,5-diaminohexanoate; minor descriptor (75-83); on-line and index medicus search amino acid isomerases (75-83) Registry number: EC 5.4.3.3 Synonym: 3,6 diaminohexanoate aminomutase, beta-lysine mutase, beta-lysine aminomutase, beta-lysine 5,6-aminomutase (26 Jun 1999) |