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Area of Science:

  • Biotechnology
  • Biochemistry
  • Structural Biology

Background:

  • Cellular efficiency relies on compartmentalization of proteins.
  • Virus-like assemblies offer a model for artificial nanocompartments.
  • Enzyme-catalyzed cascade reactions benefit from compartmentalization.

Purpose of the Study:

  • To develop a versatile strategy for co-encapsulating enzymes within a single protein cage.
  • To utilize virus-like assemblies as artificial nanocompartments for cascade reactions.
  • To investigate the role of biological compartments in enhancing metabolic efficiency.

Main Methods:

  • Noncovalent co-encapsulation of enzymes using nucleic acid tags within cowpea chlorotic mottle virus (CCMV) protein cages.
  • Characterization of resulting CCMV-like particles (21-22 nm, T=1 icosahedral symmetry) using Cryo-EM reconstruction.
  • Assessment of DNA tag functionality as a secondary biocatalyst and enzyme bridging agent.

Main Results:

  • Stable, virus-like CCMV particles were formed via a versatile strategy at neutral pH.
  • Cryo-EM confirmed the T=1 structure and revealed extra-swelling capacity of the capsids.
  • DNA tags facilitated enzyme bridging and maintained enzymatic activity within the capsid.

Conclusions:

  • Virus-like assemblies serve as effective artificial nanocompartments for enzyme-catalyzed cascade reactions.
  • The developed strategy enables efficient co-encapsulation and functional integration of multiple enzymes.
  • Mimicking biological compartments with CCMV-like particles offers insights into metabolic efficiency enhancement.