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. 1975 Mar;121(3):1122–1130. doi: 10.1128/jb.121.3.1122-1130.1975

Polyphosphate levels in nongrowing cells of Saccharomyces mellis as determined by magnesium ion and the phenomenon of "Uberkompensation".

R Weimberg
PMCID: PMC246044  PMID: 234944

Abstract

Magnesium ion enhances the maximum amount of polyphosphate that resting phosphate-starved cells of Saccharomyces mellis can store by increasing the length of time the cells will continue assimilating phosphate. The divalent cation has no effect on the rate of formation of polymer. As much as 12 times more polyphosphate is formed in cells incubated in reaction mixtures containing 0.3 M MgCl2 than in the absence of Mg2+. Potassium ion also has an influence on the amount of polyphosphate that phosphate-starved cells can accumulate but the degree of stimulation is not very large. Mg2+ and K+ have no effect on polyphosphate formation or storage in phosphate-satiated cells. Apparently, then, there are two systems for polyphosphate accumulation in S. mellis. Each system is stable in nondividing cells. The one present in phosphate-starved cells seems to be repressible by growth of the organism in media containing orthophosphate. The shift from the derepressed state to the repressed state, or vice versa, occurs only in exponentially dividing cells in appropriate media with 100% of the cells in the new physiological state by the time the cell mass has doubled. It is suggested that the word to describe the phenomenon of the accumulation of higher amounts of polyphosphate in phosphate-starved cells than the steady-state level of phosphate-satiated cells be changed from "uberkompensation" to "magnesium ubertriebung," or "magnesium enhancement."

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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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