| 3 (or 17)-beta-hydroxysteroid dehydrogenase | <enzyme> Acts on both 3 beta or 17 beta hydroxysteroids; 17 beta type 1 is probably estradiol dehydrogenases; for 3 or 17 alpha-hydroxysteroids see EC 1.1.1.209; was mapped to testosterone dehydrongenases (85-93) (see under 17-hydroxysteroid dehydrogenases (85-90); on-line search 17-hydroxysteroid dehydrogenases (85-93), index medicus search testosterone dehydrogenases (91-93), 17-hydroxysteroid dehydrogenases (85-90) Registry number: EC 1.1.1.51 Synonym: 3 beta,17 beta-hydroxysteroid dehydrogenase, 3,17-beta-hsdase, 17beta-hydroxysteroid dehydrogenase, 17beta hsd1 (26 Jun 1999) |
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| 3 alpha-hydroxysteroid-5 beta-oxidoreductase | <enzyme> From digitalis lanata; specific for 5 beta-pregnan-3-ones; does not act on 5 alpha-pregnane-3-ones or delta 4/delta 5-pregnenes Registry number: EC 1.1.1- Synonym: 3a ohs oxidoreductase (26 Jun 1999) |
| 3 beta,20 alpha-hydroxysteroid oxidoreductase | <enzyme> From calf foetal red blood cells; 17 beta-hydroxy-5 alpha-androstan-3-one and progesterone can act as substrates of 3 beta and 20 alpha reductase activities, respectively Registry number: EC 1.1.1.- Synonym: 3,20-hs oxidoreductase (26 Jun 1999) |
| 3 beta-hydroxy-delta 5-C(27)-steroid dehydrogenase | <enzyme> Second enzyme in the sequence that converts cholesterol to bile acids; deficiency leads to chronic liver disease in childhood Registry number: EC 1.1.1.- Synonym: 7 alpha-hydroxycholesterol 3 beta-dehydrogenase, 7-hydroxycholesterol 3-dehydrogenase, 3 beta-hydroxy-delta(5)-c(27)-steroid oxidoreductase, 5-cholestene-3beta,7alpha-diol oxidase (26 Jun 1999) |
| 3 beta-hydroxysteroid oxidoreductase-delta(5) 3-ketosteroid isomerase | <chemical> System found in breast cancers; consists of EC 1.1.1.145 (progesterone reductase) and EC 5.3.3.1 (steroid delta-isomerase)) Synonym: 3 ohsteroid dehydrogenase-isomerase, delta 5-3 beta hydroxysteroid dehydrogenase-isomerase, 3 beta-hydroxysteroid dehydrogenase-isomerase, 3 beta-hydroxysteroid dehydrogenase-delta(5)-delta(4)-isomerase, 3 beta-hydroxysteroid dehydrogenase-5--4-ene-isomerase, 3-beta-hydroxysteroid dehydrogenase-delta(5-4)-isomerase, 3 beta hydroxysteroid dehydrogenase-delta5-delta4-isomerasease, 3 beta-ol dehydrogenase-delta(4)-delta(5) isomerase, 3 beta-hydroxy-5-ene steroid dehydrogenase-delta 5-delta 4 isomerase (26 Jun 1999) |
| 3',5'-cyclic AMP synthetase | <enzyme> Enzyme responsible for the ATP. (06 May 1997) |
| 3',5'-cyclic-GMP phosphodiesterase | <enzyme> An enzyme that catalyses the hydrolysis of cyclic GMP to yield guanosine-5'-phosphate. Chemical name: 3',5'-Cyclic-GMP 5'-nucleotidohydrolase Registry number: EC 3.1.4.35 (12 Dec 1998) |
| 3',5'-cyclic-nucleotide phosphodiesterase | <enzyme> An enzyme that catalyses the hydrolysis of cyclic AMP to form adenosine 5'-phosphate. The enzyme is widely distributed in animal tissue and controls the level of intracellular cyclic AMP. Also acts on 3',5'-cyclic imp and 3',5'-cyclic GMP. Chemical name: 3',5'-Cyclic-nucleotide 5'-nucleotidohydrolase Registry number: EC 3.1.4.17 (12 Dec 1998) |
| 3'-phosphoadenosine 5'-phosphate | A product in sulfuryl transfer reactions. (05 Mar 2000) |
| 3'-phosphoadenosine 5'-phosphosulfate | 3'-phosphoadenosine 5'-phosphosulfate;an intermediate in the formation of urinary ethereal sulfates, notable for containing a "high energy" sulfate bond; the 3'-OH of adenosine is replaced by -OPO3H2, the 5'-OH by -OP(O2H)-OSO3H. Synonym: active sulfate. Acronym: PAPS (05 Mar 2000) |
| 3'-phosphoadenylyl-5'-phosphosulfate reductase | <enzyme> Used to detect thioredoxins from prokaryotic and eukaryotic organisms Registry number: EC 1.8.4.- Synonym: paps reductase (26 Jun 1999) |
| 3'-phosphoglycoaldehyde diesterase | <enzyme> Involved in two distinct pathways of DNA repair: initiation of the repair of oxidative strand breaks in DNA and the restoration of sites of base loss caused by many types of DNA-damaging agents; acts as apurinic/apyrimidinic endonuclease; also hydrolyzes other esters of DNA Registry number: EC 3.1.25.- Synonym: DNA diesterase, 3'-pga diesterase (26 Jun 1999) |
| 3'-pre-tRNase | <enzyme> Processes the 3'-terminus of human pre-trna(met)(i) Registry number: EC 3.1.27.- (26 Jun 1999) |
| 3(17)-hydroxysteroid dehydrogenase | <enzyme> From cytosol of female rabbit kidney; acts on both androgen and oestrogen substrates; this is specific for alpha-hydroxysteroids, for beta-hydroxy steroids see EC 1.1.1.51 Registry number: EC 1.1.1.209 Synonym: 3(17)alpha-hydroxysteroid dehydrogenase, 17alpha-hsdh, 17alpha-hydroxysteroid dehydrogenase, 17-hydroxysteroid dehydrogenase (26 Jun 1999) |
| 3,3'-diaminobenzidine | <chemical> 3,3',4,4' biphenyltetramine. Chemical name: (1,1'-Biphenyl)-3,3',4,4'-tetramine (12 Dec 1998) |