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. 1984 Dec;4(12):2858–2864. doi: 10.1128/mcb.4.12.2858

Cell cycle-dependent expression of thymidylate synthase in Saccharomyces cerevisiae.

R K Storms, R W Ord, M T Greenwood, B Mirdamadi, F K Chu, M Belfort
PMCID: PMC369298  PMID: 6396509

Abstract

Synchronous populations of Saccharomyces cerevisiae cells, generated by two independent methods, have been used to show that thymidylate synthase, in contrast to the vast majority of cellular proteins thus far examined, fluctuates periodically during the S. cerevisiae cell cycle. The enzyme, as assayed by two different methods, accumulated during S period and peaked in mid to late S phase, and then its level dropped. These observations suggest that both periodic synthesis and the instability of the enzyme contribute to the activity profile seen during the cell cycle. Accumulation of thymidylate synthase is determined at the level of its transcript, with synthase-specific mRNA levels increasing at least 10-fold to peak near the beginning of S period and then falling dramatically to basal levels after the onset of DNA synthesis. This mRNA peak coincided with the time during the cell cycle when thymidylate synthase levels were increasing maximally and immediately preceded the peak of DNA synthesis, for which the enzyme provides precursor dTMP.

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Selected References

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