Metabolic consequences of polyphosphate synthesis and imminent phosphate limitation

Abstract

AbstractCells stabilize intracellular inorganic phosphate (Pi) to compromise between large biosynthetic needs and detrimental bioenergetic effects of Pi. Pihomeostasis in eukaryotes employs SPXs domains, which are receptors for inositol pyrophosphates. We explored how polymerization and storage of Pi in acidocalcisome-like vacuoles supports S. cerevisiae metabolism and how these cells recognize Piscarcity. Whereas Pistarvation affects numerous metabolic pathways, beginning Piscarcity affects few metabolites. These include inositol pyrophosphates and ATP, a low-affinity substrate for inositol pyrophosphate-synthesizing kinases. Declining ATP and inositol pyrophosphates may thus be indicators of impending Pilimitation. Actual Pistarvation triggers accumulation of the purine synthesis intermediate 5- aminoimidazole-4-carboxamide ribonucleotide (AICAR), which activates Pi-dependent transcription factors. Cells lacking polyphosphate show Pistarvation features already under Pi-replete conditions, suggesting that vacuolar polyphosphate supplies Pifor metabolism even when Piis abundant. However, polyphosphate deficiency also generates unique metabolic changes that are not observed in starving wildtype cells. Polyphosphate in acidocalcisome-like vacuoles may hence be more than a global phosphate reserve and channel Pito preferred cellular processes.Abstract importanceCells must strike a delicate balance between the high demand of inorganic phosphate (Pi) for synthesizing nucleic acids and phospholipids, and its detrimental bioenergetic effects by reducing the free energy of nucleotide hydrolysis. The latter may stall metabolism. Therefore, microorganisms manage the import and export of phosphate, its conversion into osmotically inactive inorganic polyphosphates, and their storage in dedicated organelles, acidocalcisomes. Here, we provide novel insights into metabolic changes that cells may use to signal declining phosphate availability in the cytosol and differentiate it from actual phosphate starvation. We also analyze the role of acidocalcisome-like organelles in phosphate homeostasis. This uncovers an unexpected role of the polyphosphate pool in these organelles under phosphate-rich conditions, indicating that its metabolic roles go beyond that of a phosphate reserve for surviving starvation.