title: Differential turnover of the subunits of ribonucleotide reductase in synchronized leukemia L1210 cells.
abstract: Ribonucleotide reductase catalyzes the rate-limiting step in the de novo synthesis of 2'-deoxyribonucleoside 5'-triphosphates that is required for DNA replication. The mammalian enzyme consists of two nonidentical protein subunits that are both required for enzyme activity. In leukemia L1210 cells, enriched in G1-phase cells by centrifugal elutriation, it was found that ribonucleotide reductase activity increased as the cells progressed to S-phase. The two subunits making up the holoenzyme did not increase coordinately. The nonheme iron subunit increased much more rapidly than the effector-binding (EB) subunit. The activity of the holoenzyme paralleled the level of the EB subunit, which was limiting. The half-lives of the holoenzyme and its subunits were determined in S-phase cells by treatment with cycloheximide. The half-lives of the holoenzyme and the nonheme iron and EB subunits, as determined by enzyme activity, were 3.5, 7.6, and 4 h, respectively. These half-lives are consistent with the data that indicate that the EB subunit is the limiting component in L1210 cells.
mesh_terms: D012437:Adenosylmethionine Decarboxylase / Q000032:analysis; D000818:Animals; D002478:Cells, Cultured; D003513:Cycloheximide / Q000494:pharmacology; D004261:DNA Replication; D006207:Half-Life; D007399:Interphase; D007939:Leukemia L1210 / Q000201:enzymology* / Q000473:pathology; D012264:Ribonucleotide Reductases / Q000378:metabolism*
chemical_list: D003513:Cycloheximide; D012264:Ribonucleotide Reductases; D012437:Adenosylmethionine Decarboxylase