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Related Experiment Videos

GFP:HIV-1 protease production and packaging with a T4 phage expression-packaging processing system

J M Mullaney1, L W Black

  • 1University of Maryland School of Medicine, Baltimore 21202-1503, USA.

Biotechniques
|December 24, 1998
PubMed
Summary

This study developed a novel bacteriophage T4 system for expressing and stabilizing toxic proteins, like HIV-1 protease fused to GFP. The recombinant phage system offers improved protein solubility, purification, and long-term storage.

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DNA requirements in vivo for phage T4 packaging.

Virology·1998

Area of Science:

  • Molecular Biology
  • Virology
  • Biochemistry

Context:

  • Traditional E. coli expression systems face challenges with toxic protein solubility and stability.
  • Bacteriophage T4 offers a unique biological system for protein production and containment.

Purpose:

  • To engineer a bacteriophage T4-based system for recombinant protein expression, packaging, and processing.
  • To create a fusion protein of human HIV-1 protease and Green Fluorescent Protein (GFP) for enhanced stability and activity.

Summary:

  • A fusion protein (CTS-GFP:PR) was successfully produced and packaged within bacteriophage T4 capsids, utilizing a capsid targeting sequence (CTS) and viral proteases for processing.
  • The fusion protein demonstrated fluorescence and protease activity, with high packaging efficiency (~200 molecules/phage) and remarkable stability (>16 months at 4°C).

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  • This phage system circumvents E. coli expression issues, stabilizes foreign proteins by inhibiting host proteases, and allows for high-yield purification of soluble, processed proteins.

    • Impact:

    • Provides a novel method for the identification, purification, and long-term storage of toxic or unstable proteins.
    • Enables the study of protein folding and in vivo activities for proteins otherwise difficult to handle.
    • Presents a promising alternative expression and stabilization platform for challenging recombinant proteins.