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Oppositely charged proteins significantly slow down diffusion, even at low concentrations. This charge-driven interaction, crucial for understanding cellular processes, is unaffected by same-charge proteins.

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Area of Science:

  • Biophysics
  • Cell Biology
  • Biochemistry

Background:

  • Intracellular diffusion of positively charged proteins is suppressed, suggesting a role for electrostatic attraction.
  • The predominantly negatively charged intracellular environment may influence protein interactions.

Purpose of the Study:

  • To quantify how protein diffusion is modulated by oppositely and similarly charged interactors in aqueous solutions.
  • To investigate the role of electrostatic attraction in nonspecific protein-protein interactions.

Main Methods:

  • Single-molecule detection and statistics were used to measure protein diffusion.
  • Protein net charge states were altered by varying pH, ionic strength, and chemical modification.

Main Results:

  • Oppositely charged interactors suppressed diffusion at parts per million levels.
  • Same-charge interactors did not affect diffusion beyond 1% concentration.
  • Diffusion suppression was sensitive to protein net charge and robust across different protein pairs.

Conclusions:

  • Ubiquitous, net charge-driven protein-protein interactions exist.
  • Electrostatic attraction plays a key role in suppressing diffusion, offering insights into cellular mechanisms.