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Related Experiment Videos

Improved PC1/3 production through recombinant expression in insect cells and larvae.

Nadia Rabah1, Daniel J Gauthier, Dany Gauthier

  • 1Department of Experimental Medicine, McGill University, Montréal, Que., Canada.

Protein Expression and Purification
|September 11, 2004
PubMed
Summary

Researchers improved the production of recombinant protein convertase 1/3 (PC1/3) using modified insect cells and larvae. This advancement provides ample enzyme for crucial biochemical and structural studies.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzymology

Background:

  • Protein convertase 1/3 (PC1/3) is a vital serine endoproteinase involved in processing prohormones and proneuropeptides in endocrine and neuroendocrine cells.
  • Understanding PC1/3's structure and enzymatic properties requires large quantities of recombinant enzyme, which have been difficult to produce.

Purpose of the Study:

  • To enhance the production of recombinant PC1/3 for biochemical and structural analyses.
  • To optimize expression systems for generating active PC1/3 in insect cells and larvae.

Main Methods:

  • Engineered recombinant mutated forms of mouse PC1/3 (mPC1/3) by deleting COOH-terminal residues and replacing the signal peptide.
  • Expressed these mutated forms in Spodoptera frugiperda (Sf9) insect cells and Trichoplusia ni larvae.

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  • Optimized viral titer for larval infection and developed a purification protocol.

    • Main Results:

    • Mutant mPC1/3 showed a significant increase (up to 125%) in secretion and enzymatic activity in Sf9 cell medium compared to the original vector.
    • Recombinant active mPC1/3 was purified at a level of 30 microg/larva from insect larvae.
    • Active recombinant PC7 was also produced in high amounts from larvae.

    Conclusions:

    • The developed expression and purification strategies significantly improve the yield of enzymatically active PC1/3.
    • This method provides a scalable and efficient means to produce sufficient recombinant PC1/3 for detailed biochemical and structural investigations.
    • The findings facilitate further research into the function and regulation of PC1/3 in biological systems.