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Related Experiment Videos

Expression of hemolytically active human complement component C1r proenzyme in insect cells using a baculovirus

P Gál1, M Sárvári, K Szilágyi

  • 1Biological Research Center, Hungarian Academy of Sciences, Budapest.

Complement and Inflammation
|January 1, 1989
PubMed
Summary

Human C1r protein, a key complement component, was successfully produced in insect cells using a baculovirus expression system. This method yields biologically active C1r for potential therapeutic applications.

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Area of Science:

  • Biochemistry
  • Immunology
  • Molecular Biology

Background:

  • The human complement system is crucial for innate immunity.
  • C1r is a serine protease and a subcomponent of the C1 complex, essential for complement activation.
  • Efficient expression systems are needed for producing complement proteins like C1r.

Purpose of the Study:

  • To establish a baculovirus-insect-cell expression system for human C1r.
  • To characterize the expressed C1r protein.
  • To assess the biological activity of the recombinant C1r.

Main Methods:

  • Human C1r cDNA was cloned into the pAc373 baculovirus vector.
  • Recombinant Autographa californica nuclear polyhedrosis virus (AcNPV) was generated in Spodoptera frugiperda cells.

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  • Protein expression and secretion were confirmed using ELISA and Western blotting.
  • Purified C1r was analyzed by SDS-PAGE and reconstituted into functional C1 complex.

    • Main Results:

    • The baculovirus system efficiently produced and secreted human C1r protein (1-2 mg/l).
    • Expressed C1r was identified as the unactivated proenzyme (80-83 kD) and confirmed immunologically.
    • Reconstituted C1 complex containing recombinant C1r demonstrated hemolytic activity.

    Conclusions:

    • The baculovirus-insect-cell system is effective for expressing and secreting biologically active human C1r.
    • This system provides a scalable method for producing functional complement subcomponents.
    • The produced C1r is in its activatable proenzyme form, suitable for further studies and potential therapeutic use.