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• W2038961110 abstract "Upon exposure to 0.1 mM N-phosphonacetyl-L-aspartate (PALA), a transition state analog inhibitor of aspartate transcarbamylase, most cells of a simian virus 40 (SV40)-transformed Syrian hamster line are killed within a few days, but resistant mutants form spontaneously with frequency 2–5 × 10−5 in a stochastic process not dependent upon the presence of the inhibitor. The resistant phenotype is stable for many months in the absence of PALA. Other cell lines also give resistant mutants, but with substantially lower frequencies. Serial selection with PALA at concentrations up to 25 mM has yielded clones with more than 100 times the original aspartate transcarbamylase activity. The activities of carbamyl-P synthetase and dihydroorotase, which co-purify with aspartate transcarbamylase as a three-enzyme complex, increase in parallel with aspartate transcarbamylase activity in each resistant clone tested, but there is no substantial change in the activities of the last three enzymes of the de novo pathway, which are not in this complex. In each of the three resistant clones tested, there is an increase in the number of aspartate transcarbamylase active sites, determined by titration with 3H-PALA, which closely parallels the increase in enzyme activity. In one resistant clone tested, there is no change in the Ki for PALA or the Km for carbamyl-P. The only mechanism detected for achieving resistance to PALA is an increase in the steady state amount of the three enzyme complex." @default.
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• W2038961110 date "1976-12-01" @default.
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• W2038961110 title "Stable mutants of mammalian cells that overproduce the first three enzymes of pyrimidine nucleotide biosynthesis" @default.
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• W2038961110 doi "https://doi.org/10.1016/0092-8674(76)90036-2" @default.
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