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Combinatorial protein-protein interactions on a polymerizing scaffold.

Andrés Ortiz-Muñoz1, Héctor F Medina-Abarca2, Walter Fontana3

  • 1Division of Biology and Bioengineering, California Institute of Technology, Pasadena, CA 91125.

Proceedings of the National Academy of Sciences of the United States of America
|January 26, 2020
PubMed
Summary
This summary is machine-generated.

Polymeric scaffold proteins enhance cellular signaling by forming combinatorial ensembles. Their unique polymerization behavior boosts ligand interaction potential more effectively than multivalent systems, optimizing catalytic efficiency.

Keywords:
combinatorial assemblypleiomorphic ensemblepolymerizing scaffold

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Area of Science:

  • Cellular Biology
  • Biophysics
  • Systems Biology

Background:

  • Scaffold proteins are crucial for organizing cellular signaling pathways by forming large complexes called signalosomes.
  • Some scaffold proteins exhibit polymerization, leading to assemblies that function as combinatorial ensembles rather than simple aggregates.
  • Understanding the dynamics of ligand interactions on these polymeric scaffolds is key to deciphering cellular regulation.

Purpose of the Study:

  • To analyze the combinatorial interactions of ligands on polymeric scaffolds in both continuous and discrete models.
  • To compare the catalytic potential (Q) of polymeric scaffolds with multivalent scaffolds having a fixed number of binding sites.
  • To elucidate how scaffold polymerization influences the abundance of ligand interaction possibilities.

Main Methods:

  • Mathematical analysis of ligand-scaffold interactions in continuum and discrete settings.
  • Modeling of configurational mixtures to determine catalytic potential (Q).
  • Comparison of polymeric scaffold behavior with multivalent scaffolds under varying protomer concentrations.

Main Results:

  • Polymeric scaffolds exhibit a concentration-dependent switch in catalytic potential (Q) from first-order to second-order behavior, influenced by polymerization affinity.
  • This polymerization mechanism significantly boosts Q beyond that of any multivalent scaffold.
  • The decrease in Q at higher concentrations is mitigated in polymeric systems, with Q dropping at half the power of protomer concentration compared to multivalent systems.
  • Discrete models show similar trends, with finite-size effects potentially exaggerating behavior at low protomer numbers.

Conclusions:

  • Polymerization of scaffold proteins provides a unique mechanism for enhancing cellular signaling efficiency.
  • The distinct concentration-dependent behavior of polymeric scaffolds offers advantages over traditional multivalent scaffolds in regulating catalytic potential.
  • This study provides a theoretical framework for understanding the role of scaffold polymerization in cellular organization and signaling dynamics.