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Area of Science:

  • Biomolecular design
  • Protein engineering
  • Supramolecular chemistry

Background:

  • Proteins naturally form symmetrical assemblies, but designing such structures is challenging due to inherent protein asymmetry.
  • Existing protein design methods struggle to create complex, symmetrical architectures with controlled assembly.

Purpose of the Study:

  • To develop a novel method for designing symmetrical protein assemblies using inorganic chemistry.
  • To create discrete, polyhedral protein cages with tightly packed shells and stimuli-responsive properties.

Main Methods:

  • Utilized a 'one-pot' inorganic chemical approach coordinating soft (Fe3+) and hard (Zn2+) metal ions.
  • Modified a monomeric protein (protomer) with hydroxamate groups and zinc-binding motifs.
  • Achieved assembly into dodecameric and hexameric cages through concurrent metal ion coordination.

Main Results:

  • Successfully assembled discrete dodecameric and hexameric protein cages resembling natural polyhedral architectures.
  • Designed cages possess tightly packed shells without large apertures and exhibit stimuli-responsive assembly/disassembly.
  • Achieved complex heterobimetallic stoichiometries, some of the most compositionally complex designed protein assemblies.

Conclusions:

  • Demonstrated a versatile inorganic chemical strategy for de novo protein cage design.
  • The developed method allows for precise control over protein assembly, symmetry, and responsiveness.
  • These designed protein cages offer a new platform for biomolecular engineering and supramolecular chemistry applications.