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Enzyme Encapsulation by a Ferritin Cage.

Stephan Tetter1, Donald Hilvert1

  • 1Laboratory of Organic Chemistry, ETH Zürich, 8093, Zurich, Switzerland.

Angewandte Chemie (International Ed. in English)
|September 14, 2017
PubMed
Summary
This summary is machine-generated.

Researchers encapsulated proteins within ferritin cages using electrostatic interactions. This novel method enhances protein stability and opens doors for new nanotechnological and pharmacological applications.

Keywords:
enzymesferritinhost-guest systemsnanoreactorsprotein cages

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Area of Science:

  • Biochemistry
  • Nanotechnology
  • Structural Biology

Background:

  • Ferritins are natural protein nanocages that store iron and have potential in nanotechnology and medicine.
  • Their stability and ability to template nanoparticle synthesis are well-established.
  • Previous methods for modifying ferritins have limitations.

Purpose of the Study:

  • To develop a method for encapsulating functional proteins within ferritin cages.
  • To investigate the use of electrostatic interactions for protein encapsulation.
  • To explore the potential of ferritin-encapsulated proteins in nanotechnological and pharmacological applications.

Main Methods:

  • Utilizing electrostatic interactions between positively supercharged green fluorescent protein and the negatively charged interior of Archaeoglobus fulgidus ferritin.
  • Tethering various enzymes to the supercharged green fluorescent protein to create fusion proteins.
  • Assessing the catalytic activity, thermal stability, and resistance to proteolysis of the encapsulated enzymes.

Main Results:

  • Positively supercharged green fluorescent protein was efficiently encapsulated within ferritin cages in a tunable manner.
  • Enzymes genetically tethered to the fluorescent protein were successfully incorporated into the ferritin cages.
  • The encapsulated fusion proteins maintained high catalytic activity and exhibited increased tolerance to heat and proteolysis.

Conclusions:

  • Encapsulating proteins within ferritin cages via electrostatic interactions is feasible.
  • This approach enhances protein stability and functionality.
  • Equipping ferritins with enzymatic activity through protein encapsulation offers significant potential for nanobiotechnology and pharmacology.