The Control of cell proliferation by preformed purines: A genetic study I. Isolation and preliminary characterization of Chinese hamster lines with single or multiple defects in purine “salvage” pathways
Tóm tắt
Sublines with single or multiple defects in purine “salvage” enzymes were isolated from the Chinese hamster fibroblastic line GMA32 through single or successive onestep selections for resistance to purine analogs. They were examined for their ability to incorporate purine bases and nucleosides into macromolecules, for their sensitivity to growth inhibitory purines, and for their rescue by exogenous purines from deprivation imposed by metabolic inhibitors of endogenous synthesis. The results show that a deficiency of either adenosine kinase (EC 2.7.1.20), adenine phosphoribosyltransferase (EC 2.4.2.7), or hypoxanthine guanine phosphoribosyltransferase (EC 2.4.2.8) abolishes the ability of adenine to cause cell death by interfering with pyrimidine synthesis;on the other hand, the pyrimidine starvation caused by adenosine is fully prevented only by a deficiency of adenosine kinase.
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