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. 1980 Mar;141(3):1041–1046. doi: 10.1128/jb.141.3.1041-1046.1980

Ornithine decarboxylase activity and cell cycle regulation in Saccharomyces cerevisiae.

D G Kay, R A Singer, G C Johnston
PMCID: PMC293776  PMID: 6988399

Abstract

In the yeast Saccharomyces cerevisiae, the specific activity of the enzyme ornithine decarboxylase (ODC) was correlated with overall growth status. The activity of ODC was highest in actively growing cells, whereas the specific activity was lower in slow-growing cultures limited for nitrogen or inhibited by low concentrations of cycloheximide. Specific activities of ODC were also low in cultures arrested in the stationary phase (in the G1 portion of the cell cycle) by starvation for required nutrients. Although correlated with overall growth, ODC activity was not required for growth or cell cycle regulation. Cells continued to grow in the presence of the polyamine spermidine or spermine, which markedly reduced ODC specific activities. Thus, high levels of ODC activity were not necessary for growth, nor were decreased ODC specific activities sufficient to cause cells to arrest in G1. Conversely, one agent (o-phenanthroline) which causes growing cells to arrest in G1 did so with no effect on ODC specific activity. Therefore, ODC specific activity changes are not necessary for cell cycle regulation but simply reflect the normal growth status of cells.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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