| phosphorylase phosphatase | <enzyme> An enzyme that deactivates glycogen phosphorylase a by releasing inorganic phosphate and phosphorylase b, the inactive form. Chemical name: (Phosphorylase a) phosphohydrolase Registry number: EC 3.1.3.17 (12 Dec 1998) |
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| phosphorylase-rupturing enzyme | <enzyme> An enzyme that deactivates glycogen phosphorylase a by releasing inorganic phosphate and phosphorylase b, the inactive form. Chemical name: (Phosphorylase a) phosphohydrolase Registry number: EC 3.1.3.17 (12 Dec 1998) |
| phosphorylases | 1. General term for enzymes transferring an inorganic phosphate group to some organic acceptor, hence belonging to the transferases. 2. Specifically, enzymes that release a single glucosyl residue from a polyglucose as d-glucose 1-phosphate, the phosphate coming from inorganic orthophosphate; e.g., phosphophorylase, sucrose phosphorylases, cellobiose phosphorylases. (05 Mar 2000) |
| phosphorylation | <biochemistry> The creation of a phosphate derivative of an organic molecule. This isusually achieved by transferring a phosphate group from ATP. (09 Oct 1997) |
| phosphorylation of proteins | <biochemistry> Addition of phosphate groups to hydroxyl groups on proteins (side chains s, T or Y) catalysed by a protein kinase often specific) with ATP as phosphate donor. Activity of proteins is often regulated by phosphorylation. (18 Nov 1997) |
| phosphorylcholine | <chemical> (2-hydroxyethyl)trimethylammonium chloride phosphate. Calcium and magnesium salts used therapeutically in hepatobiliary dysfunction. Chemical name: Ethanaminium, N,N,N-trimethyl-2-(phosphonooxy)-, chloride (12 Dec 1998) |
| phosphorylethanolamine glyceridetransferase | <enzyme> An enzyme that catalyses reversibly the transfer of phosphoethanolamine from cdp-ethanolamine to diacylglycerol to yield phosphatidylethanolamine (cephalin) and cmp. The enzyme is found in the endoplasmic reticulum. Chemical name: CDPethanolamine:1,2-diacylglycerol ethanolaminephosphotransferase Registry number: EC 2.7.8.1 (12 Dec 1998) |
| phosphorylphosphatase | <enzyme> May be reversed to catalyze the in vitro synthesis of sarin and soman from their corresponding hydrolytic products Registry number: EC 3.1.3.- Synonym: organophosphate hydrolase (26 Jun 1999) |
| phosphoserine | <chemical> The phosphoric acid ester of serine. Used as an identifier in the analysis of peptides, proteins, and enzymes. Pharmacological action: indicators and reagents. Chemical name: DL-Serine, dihydrogen phosphate (ester) (12 Dec 1998) |
| phosphoserine aminotransferase | <enzyme> Class iv aminotransferase isolated from liver Chemical name: 3-phosphoserine oxoglutarate transaminase Registry number: EC 2.6.1.52 Synonym: hydroxypyruvate-p glutamate transaminase, 3-phosphoserine aminotransferase, serc gene product (26 Jun 1999) |
| phosphosphingosides | A group of phospholipids, found in brain, spinal cord, kidney, and egg yolk, containing 1-phosphocholine (choline O-phosphate) combined with a ceramide (a long-chain fatty acid linked to the nitrogen of a long-chain base, such as sphingosine). Synonym: ceramide 1-phosphorylcholine, phosphosphingosides. (05 Mar 2000) |
| phosphosugar | A phosphorylated saccharide; any sugar containing an alcoholic group esterified with phosphoric acid. (05 Mar 2000) |
| phosphothreonine | <chemical> The phosphoric acid ester of threonine. Used as an identifier in the analysis of peptides, proteins, and enzymes. Pharmacological action: indicators and reagents. Chemical name: L-Threonine, dihydrogen phosphate (ester) (12 Dec 1998) |
| phosphotransacetylase | <enzyme> An enzyme that catalyses the synthesis of acetylphosphate from acetyl-CoA and inorganic phosphate. Acetylphosphate serves as a high-energy phosphate compound. Chemical name: Acetyl-CoA:orthophosphate acetyltransferase Registry number: EC 2.3.1.8 (12 Dec 1998) |
| phosphotransferase | <enzyme> An enzyme (18 Nov 1997) |