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Adenosine Triphosphate Inhibits Cold-Responsive Aggregation.

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Adenosine triphosphate (ATP) acts as a cryoprotectant, preventing cold-salt stress damage by restoring protein interactions. This explains higher cellular ATP levels and suggests new biomedical applications for cryopreservation.

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Area of Science:

  • Biochemistry
  • Biophysics
  • Cell Biology

Background:

  • Adenosine triphosphate (ATP) is known as the primary energy currency in cells, typically functioning at micromolar concentrations.
  • Cellular ATP levels are often in the millimolar range, suggesting non-energetic roles.
  • The non-energetic functions of ATP, particularly in protein homeostasis and stress response, remain under investigation.

Purpose of the Study:

  • To investigate the non-energetic role of high cellular ATP concentrations.
  • To explore ATP's function as a cryoprotectant against combined cold and salt stress.
  • To elucidate the mechanism by which ATP mitigates cold-salt induced aggregation.

Main Methods:

  • Coupled computer simulations and experimental approaches.
  • Analysis of charged silica interfaces to observe ATP's effect on intersurface interactions.
  • Comparison of ATP's cryoprotective efficacy with glycine and betaine.

Main Results:

  • ATP restores disrupted intersurface interactions under cold-salt stress, inhibiting aggregation.
  • ATP desorbs salt cations from negatively charged surfaces via interactions with ATP.
  • ATP demonstrates superior cryoprotective efficiency compared to glycine and betaine.

Conclusions:

  • High cellular ATP concentrations are necessary for its cryoprotective role against cold-salt stress.
  • ATP's interaction mechanism is temperature-independent but scales with temperature.
  • ATP offers a promising, less toxic alternative for cryopreservation in biomedical applications.