| prolyl hydroxylase | Specific proline residues on the amino side of a glycine residue in collagen become hydroxylated at C4, before the polypeptides become helical, by the activity of prolyl hydroxylase. This enzyme has a ferrous ion at the active site and a reducing agent such as ascorbate is necessary to maintain the iron in the ferrous state. The presence of hydroxyproline is essential to produce stable triple helical tropocollagen, hence the problems caused by ascorbate deficiency in scurvy. This unusual amino acid is also present in considerable amounts in the major glycoprotein of primary plant cell walls (see HRGP). (18 Nov 1997) |
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| peptidyl prolyl cis trans isomerase | See: PPIase and immunophilin. (18 Nov 1997) |
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| prolyl | The acyl radical of proline. Prolyl dipeptidase, an enzyme cleaving l-prolyl-amino acid bonds in dipeptides containing N-terminal prolyl residues. Synonym: iminodipeptidase, prolinase, prolylglycine dipeptidase. Prolyl hydroxylase, an enzyme that catalyses the hydroxylation of certain prolyl residues in collagen precursors using molecular oxygen, ferrous ion, ascorbic acid, and alpha-keotglutarate; a vitamin C deficiency directly affects the activity of this enzyme; one form of this enzyme (prolyl 4-hydroxylase) synthesises 4-hydroxyprolyl residues while another produces 3-hydroxyprolyl residues. (05 Mar 2000) |
| prolyl aminopeptidase | <enzyme> Pepi gene product isolated from lactobacillus delbrueckii Registry number: EC 3.4.11.5 Synonym: proline aminopeptidase, cytosol aminopeptidase v, proline-imino-peptidase, proline iminopeptidase, pro-x aminopeptidase, pepi gene product, pip gene product, xanthomonas (26 Jun 1999) |
| prolyl oligopeptidase | <enzyme> Cleaves dipeptides from n-terminal end of peptide chain if penultimate residue is proline; before 1992 prolyl endopeptidase (thiol-dependent) was EC 3.4.22.18 Registry number: EC 3.4.21.26 Synonym: post-proline cleaving enzyme, proline specific endopeptidase, post-proline endopeptidase, prolyl endopeptidase, proline endopeptidase, prolyl endopeptidase I, prolyl endopeptidase (thiol-dependent) (26 Jun 1999) |
| prolyl T RNA synthetase | <enzyme> Minor descriptor (75-84); on-line and index medicus search amino acyl t RNA synthetases (75-84) Registry number: EC 6.1.1.15 Synonym: l-proline-trna-pro ligase (AMP-forming) (26 Jun 1999) |
| succinylalanyl-alanyl-prolyl-phenylalanyl-7-amino-4-methylcoumarin hydrolase | <enzyme> Enzyme may be involved in attainment of transformed state Registry number: EC 3.4.24.- Synonym: suc-ala-ala-pro-phe-amc hydrolase, saapp-amc-hydrolase (26 Jun 1999) |
| (3-(arginyl)amino-4-(4-nitrophenyl)butyryl)-leucyl-prolyl-threonine | Pharmacological action: neurotransmitters Synonym: 2-afb(p-no2)-proctolin, (afb(p-no2)(2))-proctolin (26 Jun 1999) |
| abscisic acid 8'-hydroxylase | <enzyme> Catalyses conversion of abscisic acid to 8'-hydroxyabscisic acid, which rearranges to phaseic acid Registry number: EC 1.14.99.- Synonym: aba 8'-hydroxylase (26 Jun 1999) |
| aflatoxin B1 hydroxylase | <enzyme> Hydroxylases may be replaced by mixed function oxidases as appropriate Registry number: EC 1.14.- Synonym: aflatoxin b1 4-hydroxylase (26 Jun 1999) |
| aklavinone 11-hydroxylase | <enzyme> A flavin-type bacterial hydroxylase from streptomyces peucetius; 489 amino acid residues, mw 52.3 kD; genbank u09844 Registry number: EC 1.14.14.- Synonym: dnrf protein, dnrf gene product (26 Jun 1999) |
| aniline hydroxylase | <enzyme> A drug-metabolizing, cytochrome p-450 enzyme which catalyses the hydroxylation of aniline to hydroxyaniline in the presence of reduced flavoprotein and molecular oxygen. Registry number: EC 1.14.14.- (12 Dec 1998) |
| arachidonic acid 18-hydroxylase | <enzyme> Converts arachidonic acid to 18-hydroxy-5,8,11,14-eicosatetraenoic acid in the presence of NADPH; cytochrome p450 enzyme Registry number: EC 1.14.13.- Synonym: arachidonic acid 18(r)-hydroxylase, arachidonic acid omega 3-hydroxylase (26 Jun 1999) |
| arylamine N-hydroxylase | <enzyme> Cytochrome p-448 dependent Registry number: EC 1.14.13.- Synonym: 2-aminofluorene n-hydroxylase (26 Jun 1999) |
| benzopyrene hydroxylase | <enzyme> A drug-metabolizing, cytochrome p-448 (p-450) enzyme which catalyses the hydroxylation of benzopyrene to 3-hydroxybenzopyrene in the presence of reduced flavoprotein and molecular oxygen. Also acts on certain anthracene derivatives. Registry number: EC 1.14.14.- (12 Dec 1998) |
| beta-carotene hydroxylase | <enzyme> O2-dependent NADPH-dependent monooxygenase from erwinia herbicola; forms zeaxanthin; amino acid sequence has been determined; genbank m87280 Registry number: EC 1.14.13.- Synonym: beta-carotene monooxygenase, crtz gene product (26 Jun 1999) |