Purified fractions of cytosol, vacuoles, nuclei, and mitochondria of Saccharomyces cerevisiae possessed inorganic polyphosphates with chain lengths characteristic of each individual compartment. The most part (80–90%) of the total polyphosphate level was found in the cytosol fractions. Inactivation of a PPX1 gene encoding ∼40-kDa exopolyphosphatase substantially decreased exopolyphosphatase activities only in the cytosol and soluble mitochondrial fraction, the compartments where PPX1 activity was localized. This inactivation slightly increased the levels of polyphosphates in the cytosol and vacuoles and had no effect on polyphosphate chain lengths in all compartments. Exopolyphosphatase activities in all yeast compartments under study critically depended on the PPN1 gene encoding an endopolyphosphatase. In the single PPN1 mutant, a considerable decrease of exopolyphosphatase activity was observed in all the compartments under study. Inactivation of PPN1 decreased the polyphosphate level in the cytosol 1.4-fold and increased it 2- and 2.5-fold in mitochondria and vacuoles, respectively. This inactivation was accompanied by polyphosphate chain elongation. In nuclei, this mutation had no effect on polyphosphate level and chain length as compared with the parent strain CRY. In the double mutant of PPX1 and PPN1, no exopolyphosphatase activity was detected in the cytosol, nuclei, and mitochondria and further elongation of polyphosphates was observed in all compartments.
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June 15 2006
Inorganic Polyphosphates and Exopolyphosphatases in Cell Compartments of the Yeast Saccharomyces cerevisiae Under Inactivation of PPX1 and PPN1 Genes
Lidiya Lichko;
Lidiya Lichko
1Skryabin Institute of Biochemistry and Physiology of Microorganisms, Russian Academy of Sciences, 142290, Pushchino, Moscow Region, Russia
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Tatyana Kulakovskaya;
Tatyana Kulakovskaya
1Skryabin Institute of Biochemistry and Physiology of Microorganisms, Russian Academy of Sciences, 142290, Pushchino, Moscow Region, Russia
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Nikolai Pestov;
Nikolai Pestov
1Skryabin Institute of Biochemistry and Physiology of Microorganisms, Russian Academy of Sciences, 142290, Pushchino, Moscow Region, Russia
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Igor Kulaev
Igor Kulaev
1Skryabin Institute of Biochemistry and Physiology of Microorganisms, Russian Academy of Sciences, 142290, Pushchino, Moscow Region, Russia
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Publisher: Portland Press Ltd
Online ISSN: 1573-4935
Print ISSN: 0144-8463
© 2006 Springer Science+Business Media, Inc.
2006
Biosci Rep (2006) 26 (1): 45–54.
Citation
Lidiya Lichko, Tatyana Kulakovskaya, Nikolai Pestov, Igor Kulaev; Inorganic Polyphosphates and Exopolyphosphatases in Cell Compartments of the Yeast Saccharomyces cerevisiae Under Inactivation of PPX1 and PPN1 Genes. Biosci Rep 15 June 2006; 26 (1): 45–54. doi: https://doi.org/10.1007/s10540-006-9003-2
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