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Inorganic Polyphosphate in Mammals: Mechanisms, Maladies, and Moving Forward.

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Inorganic polyphosphate (polyP) is a vital polymer regulating cell functions, but its mechanisms and synthesis are unclear. Research aims to integrate polyP

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Area of Science:

  • Biochemistry
  • Cellular Biology
  • Molecular Biology

Background:

  • Inorganic polyphosphate (polyP) is a conserved, critical polymer regulating diverse mammalian cellular functions.
  • Its roles in coagulation, inflammation, and mitochondrial function are known, but molecular mechanisms remain poorly understood.
  • Key questions persist regarding physiological concentration, chain-length distribution, and compartment-specific regulation.

Purpose of the Study:

  • To integrate molecular protein-interaction mechanisms with compartment-specific functions and disease physiology of polyP.
  • To provide a clearer mechanistic framework for polyP's biological effects.
  • To identify key conceptual and methodological gaps in polyP research.

Main Methods:

  • Literature review integrating existing studies on polyP.
  • Analysis of molecular protein-interaction mechanisms.
  • Examination of compartment-specific functions and disease physiology.

Main Results:

  • PolyP modulates the mitochondrial permeability transition pore and activates coagulation factor XII.
  • Recent studies suggest roles in protein phase separation, ATP-independent chaperone activity, metabolic regulation, and intracellular signaling.
  • Potential connections to neurodegeneration, cancer, and tissue regeneration are emerging.

Conclusions:

  • Understanding polyP's complex roles requires integrating molecular mechanisms with cellular functions and disease contexts.
  • Incomplete mapping of protein targets and technical limitations hinder interpretation of polyP's biological effects.
  • Further research is needed to elucidate polyP synthesis, regulation, and precise functions in mammalian systems.