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Related Experiment Videos

Functional three-domain single-chain T-cell receptors

S Chung1, K W Wucherpfennig, S M Friedman

  • 1Department of Biochemistry and Molecular Biology, Harvard University, Cambridge, MA 02138.

Proceedings of the National Academy of Sciences of the United States of America
|December 20, 1994
PubMed
Summary

Engineered single-chain T-cell receptors (TCRs) require a constant domain for proper folding and function. This three-domain design enables efficient expression of functional single-chain TCRs for potential therapeutic applications.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Biochemistry

Background:

  • T-cell receptors (TCRs) are crucial for adaptive immunity, structurally similar to antibodies.
  • Antibodies can be engineered into single-chain variants, but TCRs present unique structural challenges.
  • Understanding TCR assembly is key to developing novel immunotherapies.

Purpose of the Study:

  • To investigate the structural requirements for engineering functional single-chain T-cell receptors (TCRs).
  • To determine if a three-domain single-chain TCR construct could overcome folding and assembly limitations.
  • To assess the signaling capacity of engineered single-chain TCRs.

Main Methods:

  • Constructed two-domain and three-domain single-chain TCRs using variable alpha (Vα) and variable beta (Vβ) domains.

Related Experiment Videos

  • Incorporated the constant beta (Cβ) domain into the three-domain construct.
  • Expressed chimeric single-chain TCRs linked to glycosyl phosphatidylinositol (GPI) or CD3 zeta chain in eukaryotic cells.
  • Utilized conformation-sensitive antibodies and functional assays to assess expression and signaling.

    • Main Results:

    • Proper assembly of TCR variable domains was dependent on the inclusion of the Cβ domain.
    • The three-domain single-chain TCR, particularly when linked to CD3 zeta, was recognized by a conformation-sensitive antibody.
    • Functional signaling was observed in response to specific peptide-MHC complexes and superantigens.
    • High efficiency expression of functional single-chain TCRs was achieved with the three-domain design.

    Conclusions:

    • The constant domain (Cβ) is essential for the cooperative folding of TCR variable domains, unlike in antibodies.
    • The three-domain single-chain TCR design facilitates efficient expression and functional signaling.
    • This approach offers a promising strategy for developing engineered TCR-based therapeutics.