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Creating Highly Specific Chemically Induced Protein Dimerization Systems by Stepwise Phage Selection of a Combinatorial Single-Domain Antibody Library
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A general chemical synthesis platform for crosslinking multivalent single chain variable fragments.

Joan G Schellinger1, Avinash Kudupudi, Arutselvan Natarajan

  • 1Chemistry Department, University of California Davis, One Shields Avenue, Davis, CA 95616, USA.

Organic & Biomolecular Chemistry
|December 2, 2011
PubMed
Summary

Multivalent single-chain variable fragments (scFv) offer enhanced tumor binding compared to traditional antibodies. This study presents a versatile chemical crosslinking strategy for creating stable, multivalent immunoconjugates for cancer therapy and imaging.

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Area of Science:

  • Biotechnology
  • Immunology
  • Chemical Biology

Background:

  • Multivalent single-chain variable fragments (scFv) exhibit superior affinity for tumor-associated antigens over monovalent scFv and intact monoclonal antibodies (mAb).
  • Covalent multivalent constructs offer enhanced in vivo and in vitro stability compared to self-associating variants.
  • Genetically engineered expression vectors enable site-specific cysteine functionalization of scFv for covalent attachment.

Purpose of the Study:

  • To develop and validate a versatile chemical crosslinking strategy for constructing stable, multivalent immunoconjugates.
  • To utilize di-scFv-C constructs with site-specific cysteine for conjugation with polyethylene glycol (PEG) linkers.
  • To evaluate the efficacy of copper(I) catalyzed azide alkyne 1,3-dipolar cycloaddition (CuAAC) chemistry for creating these conjugates.

Main Methods:

  • Genetically engineered expression vectors to produce di-scFv-C with central cysteine functionality.
  • Chemical crosslinking of scFv thiol groups using azide and multi-alkyne functionalized PEG linkers.
  • Copper(I) catalyzed azide alkyne 1,3-dipolar cycloaddition (CuAAC) for covalent ligation of protein conjugates.
  • SDS-PAGE and densitometry to determine ligation yields; ELISA to assess tumor binding.

Main Results:

  • Chemoselective ligation via CuAAC achieved >70% yield with optimized PEG linkers.
  • Developed di-scFv-C constructs derived from anti-MUC1 mAb for targeting cancer cells.
  • ELISA demonstrated significantly increased tumor binding of the resulting tetravalent scFv construct.

Conclusions:

  • A versatile chemical crosslinking strategy enables the construction of biologically active multivalent and bi-specific immunoconjugates.
  • The developed method provides stable, high-affinity constructs with potential applications in pre-targeted radioimmunotherapy and imaging.
  • This approach offers a robust platform for advancing targeted cancer therapies and diagnostics.