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Characterization of Glycoproteins with the Immunoglobulin Fold by X-Ray Crystallography and Biophysical Techniques
Published on: July 5, 2018
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Engineered antigen-binding fragments for enhanced crystallization of antibody:antigen complexes
Heather A Bruce1, Alexander U Singer1, Ekaterina V Filippova2
1School of Pharmacy, University of Waterloo, Waterloo, Canada.
Protein Science : a Publication of the Protein Society
|November 9, 2023
Summary
Improving antibody fragment (Fab) crystallization is key for understanding antigen interactions. This study identifies surface substitutions that enhance Fab crystallization, significantly aiding structural biology research.
Area of Science:
- Structural Biology
- Protein Crystallography
- Immunology
Background:
- X-ray crystallography provides atomic-resolution insights into antibody-antigen interactions.
- Many antibody fragment (Fab):antigen complexes resist crystallization, hindering structural studies.
Purpose of the Study:
- To identify surface substitutions that enhance the crystallizability of human Fab frameworks.
- To investigate the synergistic effects of combining different Fab framework modifications for improved crystallization.
Main Methods:
- Employed surface entropy reduction strategy and phage-display technology to engineer Fab variants.
- Performed extensive crystallization screening of engineered Fabs and Fab:antigen complexes.
- Determined and analyzed the structures of crystallized complexes.
Main Results:
- Identified specific surface substitutions that significantly improve Fab framework crystallizability.
- Demonstrated extraordinary enhancement in crystallizability when combining new substitutions with Crystal Kappa and elbow modifications.
- Revealed a strong synergistic relationship between different sets of substitutions.
Conclusions:
- Surface entropy reduction and phage display are effective for engineering crystallizable antibody fragments.
- Combined substitutions offer synergistic benefits, dramatically improving Fab and Fab:antigen complex crystallizability.
- Understanding the roles and complementarity of these substitutions facilitates structural determination of antibody-antigen interactions.
Keywords:
antibody fragmentsantibody librarycrystal lattice contactscrystallization platformprotein engineeringsurface entropy reductionMore Related Videos
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