title: Effect of lowered intracellular ATP and GTP concentrations on purine ribonucleotide synthesis and interconversion.
abstract: The effects of lowered intracellular ATP and GTP concentrations on enzymes of purine ribonucleotide synthesis and intercoversion were studied using intact Ehrlich ascites tumor cells. The apparent rates of phosphoribosyl pyrophosphate synthetase (EC 2.7.6.1) and of inosinate dehydrogenase (EC 1.2.1.14) were increased in cells containing lowered purine nucleotide concentrations, but apparent activities of amidophosphoribosyltransferase (EC 2.4.2.14), the purine phosphoribosyltransferases, and other enzymes of purine ribonucleotide interconversion were not affected.
mesh_terms: D000228:Adenine Phosphoribosyltransferase / Q000378:metabolism; D000582:Amidophosphoribosyltransferase / Q000378:metabolism; D000818:Animals; D000903:Antibiotics, Antineoplastic / Q000494:pharmacology*; D001377:Azaserine / Q000494:pharmacology*; D002286:Carcinoma, Ehrlich Tumor / Q000378:metabolism; D005557:Formaldehyde / Q000031:analogs & derivatives / Q000494:pharmacology; D005998:Glycine / Q000031:analogs & derivatives / Q000378:metabolism; D007041:Hypoxanthine Phosphoribosyltransferase / Q000378:metabolism; D051379:Mice; D009173:Mycophenolic Acid / Q000494:pharmacology*; D010754:Phosphoribosyl Pyrophosphate / Q000378:metabolism; D011685:Purine Nucleotides / Q000096:biosynthesis*; D012268:Ribose-Phosphate Pyrophosphokinase / Q000378:metabolism; D012267:Ribosemonophosphates / Q000378:metabolism
chemical_list: D000903:Antibiotics, Antineoplastic; D011685:Purine Nucleotides; D012267:Ribosemonophosphates; D005557:Formaldehyde; D010754:Phosphoribosyl Pyrophosphate; D001377:Azaserine; D000582:Amidophosphoribosyltransferase; D000228:Adenine Phosphoribosyltransferase; D007041:Hypoxanthine Phosphoribosyltransferase; D012268:Ribose-Phosphate Pyrophosphokinase; D009173:Mycophenolic Acid; D005998:Glycine