Inorganic polyphosphate: essential for growth and survival.

By N. N. Rao, M. Gómez-García, A. Kornberg. Annual Review of Biochemistry, 2009

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Bacterial polymers: biosynthesis, modifications and applications (2010, background): “PPK2 homologues have been found to be widely spread among bacteri”
Platelet polyphosphates are proinflammatory and procoagulant mediators in vivo (2009, neutral): “coli contain high amounts of polyP (Rao et al., 2009), which readily activates the contact system (Figure 4).”
Stress Physiology of Lactic Acid Bacteria (2016, background): “The ability of lactobacilli to accumulate poly-P is correlated with the presence of ppk genes in the strains and the availability of phosphate in the medium (227, 228).”
Oxidative Stress Resistance in Deinococcus radiodurans (2011, background): “PolyP can serve as a source of energy for ATP synthesis; as a phosphorylating agent for sugars, nucleosides, and proteins; as a means of activating the precursors of nucleic acids, phospholipids, polypeptides, and fatty acids; for the chelation of metals; as a buffer against alkali; for bacterial Ca”