Abstract
Virtually all of the polyphosphate (PP) present in yeast protoplasts can be recovered in a crude particulate fraction if polybase-induced lysis is used for disrupting the protoplasts. This fraction contains most of the vacuoles, mitochondria and nuclei. Upon the purification of vacuoles the PP is enriched to the same extent as are the vacuolar markers. The amount of PP per vacuole is comparable to the amount of PP per protoplast.
The possibility that PP is located in the cell wall is also considered. In the course of the incubation necessary for preparing protoplasts, 20% of the cellular PP is broken down. As this loss of PP occurs to the same extent in the absence of cell wall degrading enzymes, it is inferred that internal PP is metabolically degraded, no PP being located in the cell walls.
It is concluded that in Saccharomyces cerevisiae most if not all of the PP is located in the vacuoles, at least under the growth conditions used.
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Abbreviations
- PIPES:
-
piperazine-N,N′-bis-2-ethanolsulfonic acid
- DEAE-dextran:
-
diethylaminoethyl-dextran
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Urech, K., Dürr, M., Boller, T. et al. Localization of polyphosphate in vacuoles of Saccharomyces cerevisiae . Arch. Microbiol. 116, 275–278 (1978). https://doi.org/10.1007/BF00417851
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DOI: https://doi.org/10.1007/BF00417851