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Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
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Assembly and Characterization of Polyelectrolyte Complex Micelles
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Selective protein complexation and coacervation by polyelectrolytes.

Yisheng Xu1, Miaomiao Liu2, Mostufa Faisal2

  • 1State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China; Engineering Research Center of Materials Chemical Engineering of Xinjiang Bintuan, Shihezi University, Xinjiang 832000, China.

Advances in Colloid and Interface Science
|July 6, 2016
PubMed
Summary

This review explores how protein charge anisotropy and binding affinity influence selective phase separation. Understanding protein-polyelectrolyte interactions can predict selective protein binding and coacervation, challenging traditional binding site assumptions.

Keywords:
CoacervationElectrostaticsNon-specific interactionPolyelectrolyteSelectivity

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Area of Science:

  • Biophysics
  • Polymer Science
  • Biochemistry

Background:

  • Protein-polyelectrolyte (PE) interactions are crucial in biological systems.
  • Selective phase separation is key for cellular organization and biomaterial design.
  • Current models often assume specific binding sites for protein-polymer interactions.

Purpose of the Study:

  • To review the relationship between protein charge anisotropy, binding affinity, polymer structure, and selective phase separation.
  • To explore the potential of predicting selective protein binding and coacervation via electrostatically driven protein-polyelectrolyte interactions.
  • To challenge the paradigm that specific binding requires dedicated binding sites and geometric complementarity.

Main Methods:

  • Review of recent studies on selective protein binding by polyelectrolytes.
  • Analysis of electrostatic features of proteins and polyelectrolytes.
  • Examination of different protein-polyelectrolyte assemblies and their phase separation behavior.

Main Results:

  • Protein charge anisotropy and binding affinity are significant factors in selective phase separation.
  • Electrostatically driven protein-polyelectrolyte interactions can lead to predictable selective binding and coacervation.
  • Non-specific electrostatics can drive selective protein-polymer interactions, offering an alternative to specific binding mechanisms.

Conclusions:

  • A fundamental understanding of protein-polyelectrolyte electrostatics can enable prediction of selective coacervation.
  • Selective binding can be achieved through non-specific electrostatic interactions, not solely through specific binding sites.
  • Polyelectrolytes offer potential for protein purification through optimized selective phase separation based on binding affinity.