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Polyphosphate Granules and Acidocalcisomes

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Bacterial Organelles and Organelle-like Inclusions

Part of the book series: Microbiology Monographs ((MICROMONO,volume 34))

Abstract

Polyphosphate (polyP) is a linear polymer of phosphate residues linked by energy-rich phospho-anhydride bonds. It can be formed abiotically by heating of phosphate solutions (e.g. by vulcanism) or biologically by the action of enzymes, so-called polyphosphate kinases (PPKs). PolyP is an ubiquitous polymer present in virtually all organisms that have been looked at and therefore should be of fundamental importance. It can have an astonishing variety of functions in different species from that of a reservoir for phosphorous in many prokaryotes to a part of the blood coagulation system in mammalians. This chapter focuses only on polyP in prokaryotes where it is present in the form of granule-like inclusions of roughly 50 to about 500 nm diameter. Despite their ubiquitous occurrence in bacteria, the structures and composition of polyP granules in bacteria are only poorly understood. In this chapter I will provide an update of the various functions polyP can have in prokaryotes, will give an overview on PPK enzymes and describe some recent findings showing that polyP granules have an astonishing high number of proteins specifically bound to the surface of polyP granules (polyphosphatosomes). In addition, I will discuss the pros and cons whether acidic, membrane-enclosed, polyP and calcium-ions containing organelles (acidocalcisomes) exist in prokaryotes.

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Acknowledgements

I thank the Deutsche Forschungsgemeinschaft for support. I deeply appreciate the work of my current and previous co-workers and students in polyP metabolism: Chiara Brück, Celina Frank, Jennie Hildenbrand, Andrea Kaufmann, Lea Kneißle, Anna Kerber, Hannes Lothholz, Simone Reinhardt, Hanna Rosigkeit, Helen Sibold, Tony Tumlirsch.

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Correspondence to Dieter Jendrossek .

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Jendrossek, D. (2020). Polyphosphate Granules and Acidocalcisomes. In: Jendrossek, D. (eds) Bacterial Organelles and Organelle-like Inclusions. Microbiology Monographs, vol 34. Springer, Cham. https://doi.org/10.1007/978-3-030-60173-7_1

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