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Modulating Antibody Structure and Function through Directed Mutations and Chemical Rescue.

Christine E Kaiser1, Juan Pablo Rincon Pabon2, Jittasak Khowsathit3

  • 1Discovery Biology, Discovery Sciences , IMED Biotech Unit, AstraZeneca , Boston , Massachusetts 02451 , United States.

ACS Synthetic Biology
|April 4, 2018
PubMed
Summary
This summary is machine-generated.

Researchers developed tunable antibodies controlled by small molecules. By mutating antibody structure and adding a specific molecule, antigen binding affinity can be modulated, offering new control strategies.

Keywords:
antibody binding domainschemical rescue of structuredesigned protein switchsingle chain variable fragment (scFv)small molecule modulatorsstructure−function relationship

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Immunology

Background:

  • Monoclonal antibodies are vital therapeutics and research tools.
  • Controlling antibody activity precisely is crucial for advanced applications.
  • Current methods lack fine-tuned, external control over antibody function.

Purpose of the Study:

  • To develop a novel strategy for creating tunable antibodies.
  • To demonstrate proof of concept for small molecule-controlled antibody activity.
  • To engineer antibodies with externally regulated antigen-binding affinity.

Main Methods:

  • Incorporated cavity-forming mutations (Trp to Gly) into an anti-fluorescein scFv (FITC-E2).
  • Assessed the impact of mutations on protein structure and antigen binding affinity.
  • Investigated the rescue of structure and function by adding indole, a small molecule.

Main Results:

  • Tryptophan to glycine mutations disrupted antibody structure and reduced antigen binding.
  • Addition of indole rescued both protein structure and antigen-binding function.
  • Demonstrated a modest, yet significant, affinity modulation in response to indole.

Conclusions:

  • Engineered mutations can disrupt antibody structure and function.
  • Small molecules can be used to restore antibody activity, enabling tunable control.
  • This approach provides a framework for developing novel antibody therapeutics and research tools with external regulation.