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Area of Science:

  • Biochemistry and Molecular Biology
  • Cellular Signaling Dynamics

Background:

  • Intracellular environments are crowded, influencing protein-protein interactions crucial for signaling.
  • Calmodulin (CaM) signaling is complex due to competition among over 300 targets.
  • The impact of macromolecular crowding on specific steps of protein-target binding remains underexplored.

Purpose of the Study:

  • To investigate how high concentrations of cosolutes affect calmodulin-target affinity and kinetics.
  • To systematically analyze the influence of crowding agents on each step of the CaM-target binding mechanism.

Main Methods:

  • Studied CaM-target binding kinetics in crowded environments using ficoll-70, dextran-10, and sucrose.
  • Methodically analyzed association and dissociation rates at each step of the binding pathway.
  • Investigated conformational changes in CaM induced by cosolutes.

Main Results:

  • Cosolutes stabilized compact CaM conformers.
  • All tested cosolutes modulated association kinetics by influencing diffusion and conformational change rates.
  • Differently sized cosolutes variably enhanced or impeded distinct steps of the CaM association pathway.
  • On- and off-rates were compensated, resulting in minimal changes to steady-state CaM-target affinity.

Conclusions:

  • Macromolecular crowding and osmolytes significantly alter the kinetics of CaM-target interactions.
  • Cosolutes modulate specific steps in the binding pathway, affecting diffusion and conformational dynamics.
  • These findings provide a kinetic framework for understanding protein-protein interactions in crowded cellular signaling environments.