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A simple tagging system for protein encapsulation.

Florian P Seebeck1, Kenneth J Woycechowsky, Wei Zhuang

  • 1Laboratorium für Organische Chemie, ETH Zürich, Hönggerberg HCI F337, CH-8093, Zürich, Switzerland.

Journal of the American Chemical Society
|April 6, 2006
PubMed
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Engineered protein capsids can now encapsulate specific proteins using charge-based attraction. This novel molecular encapsulation system demonstrates a straightforward method for designing both the container and the cargo.

Area of Science:

  • Biotechnology
  • Protein Engineering
  • Molecular Biology

Background:

  • Molecular containers are crucial for various biological and synthetic applications.
  • Protein-based capsids offer a versatile platform for encapsulation.
  • Controlling cargo loading within protein containers remains a challenge.

Purpose of the Study:

  • To develop a simple, charge-based system for encapsulating tagged proteins within engineered protein capsids.
  • To demonstrate the convergent design of both container and cargo components for protein encapsulation.

Main Methods:

  • Engineering the lumazine synthase from Aquifex aeolicus (AaLS) by adding negative charges.
  • Utilizing charge complementarity between the engineered AaLS capsid and a positively charged deca-arginine tagged green fluorescent protein (GFP).

Related Experiment Videos

  • Co-producing the engineered AaLS and tagged GFP in Escherichia coli.
  • Analyzing capsid formation and size using analytical ultracentrifugation and scanning force microscopy.

    • Main Results:

    • Engineered AaLS successfully formed protein capsids.
    • The engineered capsids showed increased average size compared to wild-type.
    • The engineered capsids effectively associated with the deca-arginine tagged GFP, demonstrating successful encapsulation.
    • The system demonstrated charge-based protein-protein association for encapsulation.

    Conclusions:

    • A straightforward, charge-complementarity-based strategy for protein encapsulation within engineered protein capsids was successfully developed.
    • This method allows for the convergent design of both the protein container and the tagged cargo.
    • The findings enhance the versatility of protein-based encapsulation systems for diverse applications.