| polynucleotide phosphorylase | <enzyme> An enzyme of the transferase class that catalyses the reaction RNA(n+1) and orthophosphate to yield RNA(n) and a nucleoside diphosphate, or the reverse reaction. ADP, idp, GDP, udp, and cdp can act as donors in the latter case. Chemical name: Polyribonucleotide:orthophosphate nucleotidyltransferase Registry number: EC 2.7.7.8 (12 Dec 1998) |
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| xanthosine phosphorylase | <enzyme> From E coli k-12; mw 18kda; inactivated by p-chloromercuriphenylsulfonic acid Registry number: EC 2.4.2.- Synonym: inosine-guanosine phosphorylase (26 Jun 1999) |
| purine-nucleoside phosphorylase | <enzyme> An enzyme that catalyses the reaction between a purine nucleoside and orthophosphate to form a free purine plus ribose-5-phosphate. Chemical name: Purine-nucleoside:orthophosphate ribosyltransferase Registry number: EC 2.4.2.1 (12 Dec 1998) |
| pyrimidine-nucleoside phosphorylase | <enzyme> Consider uridine phosphorylase and thymidine phosphorylase Registry number: EC 2.4.2.2 Synonym: pyrimidine nucleoside phosphorylase (26 Jun 1999) |
| nucleoside phosphorylase | <enzyme> From klebsiella sp.; acts on both purine and pyrimidine nucleosides and catalyses the production of araa from uridine arabinoside (arau) and adenine Registry number: EC 2.4.2.- (26 Jun 1999) |
| orotidylic acid phosphorylase | <enzyme> The enzyme catalyzing the formation of orotidine-5'-phosphoric acid (orotidylic acid) from orotic acid and 5-phosphoribosyl-1-pyrophosphate in the course of pyrimidine nucleotide biosynthesis. Chemical name: Orotidine-5'-phosphate:pyrophosphate phospho-alpha-D-ribosyltransferase Registry number: EC 2.4.2.10 (12 Dec 1998) |
| thymidine phosphorylase | <enzyme> The enzyme catalyzing the transfer of 2-deoxy-d-ribose from thymidine to orthophosphate, thereby liberating thymidine. Chemical name: Thymidine:orthophosphate deoxy-D-ribosyltransferase Registry number: EC 2.4.2.4 (12 Dec 1998) |
| urateribonucleotide phosphorylase | A ribosyltransferase that reacts urate d-ribonucleotide with orthophosphate to produce urate plus d-ribose 1-phosphate. (05 Mar 2000) |
| uridine phosphorylase | <enzyme> An enzyme that catalyses the transfer of ribose from uridine to orthophosphate, forming uracil and ribose 1-phosphate. Chemical name: Uridine:orthophosphate alpha-D-ribosyltransferase Registry number: EC 2.4.2.3 (12 Dec 1998) |
| 100RNP-polynucleotide phosphorylase | <enzyme> A chloroplast exoribonuclease that degrades polyadenylated RNA much faster than non-polyadenylated RNA Registry number: EC 3.1.13.- Synonym: 100rnp-pnpase (26 Jun 1999) |
| 5'-methylthioadenosine phosphorylase | <enzyme> Methylthioadenosine to methylthioribose-1-phosphate and adenine in the presence of orthophosphate Registry number: EC 2.4.2.28 Synonym: methylthioadenosine nucleosidase, methylthioadenosine phosphorylase, 5'-deoxy-5'-methylthioadenosine phosphorylase (26 Jun 1999) |
| laminaribiose phosphorylase | <enzyme> From euglena gracillis z; contains three isoforms; catalyses a reversible phosphorolysis of laminaribiose; also acts on 1,3-beta-d-oligoglucans Registry number: EC 2.4.1.31 (26 Jun 1999) |
| acetyl-CoA:alpha-glucosaminide acetyltransferase | <enzyme> An enzyme involved in the synthesis of certain carbohydrate moieties on proteins. A deficiency of this enzyme leads to mucopolysaccharidosis type III C. (05 Mar 2000) |
| adrenergic alpha-agonists | Drugs that selectively bind to and activate alpha adrenergic receptors. (12 Dec 1998) |
| adrenergic alpha-antagonists | Drugs that bind to but do not activate alpha-adrenergic receptors thereby blocking the actions of endogenous or exogenous adrenergic agonists. Adrenergic alpha-antagonists are used in the treatment of hypertension, vasospasm, peripheral vascular disease, shock, and pheochromocytoma. (12 Dec 1998) |