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Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order...
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POMPOMS: Crosslinked Biomolecular Condensates as a Versatile Platform for Multifunctional Protein Microparticles.

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Researchers developed protein-based microparticles using biomolecular condensates. This new method allows for controlled size and functionalization, offering a versatile platform for biocatalysis and biomolecular capture applications.

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Area of Science:

  • Biomaterials Science
  • Chemical Engineering
  • Molecular Biology

Background:

  • Protein-based microparticles offer potential for biocatalysis and biomolecular capture.
  • Existing fabrication methods face challenges like protein denaturation and limited spatial control.

Purpose of the Study:

  • To develop a novel method for synthesizing protein-based microparticles with controlled size and functionality.
  • To overcome limitations of current techniques in protein material fabrication.

Main Methods:

  • Utilized liquid-liquid phase separation of RGG domains to form protein droplets.
  • Chemically crosslinked droplets using BS3 to create porous microparticles (POMPOMS).
  • Modulated protein concentration and condensate coalescence to control microparticle size (<1 to >40 μm).

Main Results:

  • Demonstrated tunable microparticle size by controlling protein concentration and coalescence.
  • Engineered three functionalities: cargo protein capture via SpyCatcher/SpyTag, spatial organization in core-shell structures, and enzyme immobilization (31% retained activity).

Conclusions:

  • Developed POMPOMS, a sustainable and tunable platform for versatile protein-based materials.
  • The method enables precise control over microparticle size and spatial organization.
  • Showcased potential applications in biocatalysis and biomolecular capture.