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Updated: Jan 27, 2026

Modifying Baculovirus Expression Vectors to Produce Secreted Plant Proteins in Insect Cells
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FlexiBAC: a versatile, open-source baculovirus vector system for protein expression, secretion, and proteolytic

Régis P Lemaitre1, Aliona Bogdanova1, Barbara Borgonovo1

  • 1Max Planck Institute of Molecular Cell Biology and Genetics, Pfotenhauerstrasse 108, 01307, Dresden, Germany.

BMC Biotechnology
|March 31, 2019
PubMed
Summary

The novel FlexiBAC system streamlines baculovirus expression in insect cells, enabling rapid production of complex proteins, including difficult-to-express secreted growth factors.

Keywords:
BaculovirusIntrinsically disordered proteinsProtein expressionTGF-β

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Area of Science:

  • Biotechnology
  • Molecular Biology
  • Protein Expression

Background:

  • Baculovirus expression systems are effective for protein production in insect cells.
  • Existing methods are often slow, lack protein tagging flexibility, and struggle with secreted proteins needing proteolytic maturation, like TGF-β growth factors.

Purpose of the Study:

  • To develop an improved baculovirus expression system addressing limitations of current methods.
  • To reduce the time and complexity of producing both cytosolic and secreted proteins.

Main Methods:

  • Engineered the FlexiBAC system for intracellular recombinant baculovirus formation.
  • Utilized 143 shuttle vectors for versatile protein tagging (purification, fluorescent, cleavage, trafficking, conjugation).
  • Overexpressed recombinant furin convertase for efficient proteolytic processing of secreted proteins.

Main Results:

  • Reduced the protein production timeline to 13 days from initial cloning.
  • Successfully produced high yields of mature, active TGF-β family growth factors (e.g., Activin A).
  • Demonstrated efficacy for challenging proteins with coiled-coil, low complexity, or disordered domains.

Conclusions:

  • FlexiBAC is a versatile protein expression system for cytosolic and secreted proteins requiring proteolytic maturation.
  • The system simplifies baculovirus production and reduces cloning steps through its design and shuttle vectors.