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Related Experiment Videos

Crystallization of single-chain Fv proteins

N Z Essig1, J F Wood, A J Howard

  • 1Protein Engineering Department Enzon Incorporated, Piscataway, NJ 08854-3998.

Journal of Molecular Biology
|December 5, 1993
PubMed
Summary

Researchers overcame aggregation issues in single-chain variable fragment (sFv) proteins, enabling crystallization. Methods included proteolytic cleavage and dimer purification, crucial for antibody fragment structural studies.

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Area of Science:

  • Protein crystallography
  • Structural biology
  • Immunology

Background:

  • Single-chain variable fragment (sFv) proteins are antibody fragments comprising variable heavy (VH) and variable light (VL) domains linked by a polypeptide.
  • sFv aggregation during concentration hinders crystallization, impeding structural analysis.
  • Aggregation is influenced by linker integrity, protein identity, ligand presence, and linker characteristics.

Purpose of the Study:

  • To develop methods for crystallizing single-chain Fv proteins.
  • To investigate the causes of sFv aggregation and find solutions.
  • To enable structural determination of sFv proteins for therapeutic and diagnostic applications.

Main Methods:

  • Crystallization of sFv proteins specific for fluorescein (4-4-20 sFv) and TAG-72 antigen (CC49 sFv).

Related Experiment Videos

  • Investigated monomer-multimer equilibrium and aggregation during protein concentration.
  • Developed two methods to overcome aggregation: proteolytic linker cleavage and purification of sFv dimers.

    • Main Results:

    • Two strategies successfully yielded X-ray diffraction-quality crystals of sFv proteins.
    • Proteolytic cleavage of the linker produced crystallizable Fv fragments.
    • Purification of sFv dimers, with intact linkers, provided an alternative crystallization approach.
    • A novel dimer interface model involving intermolecular VL/VH interactions was proposed.

    Conclusions:

    • Methods to overcome sFv aggregation are essential for structural studies.
    • Proteolytic cleavage and dimer purification are effective strategies for sFv crystallization.
    • Further structural determination of sFv dimers will validate proposed molecular association models.
    • Optimizing linker length and antigen binding are potential strategies for difficult-to-crystallize sFv proteins.