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A High Content Imaging Assay for Identification of Botulinum Neurotoxin Inhibitors
Published on: November 14, 2014
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Structural Insights into Rational Design of Single-Domain Antibody-Based Antitoxins against Botulinum Neurotoxins
Kwok-Ho Lam1, Jacqueline M Tremblay2, Edwin Vazquez-Cintron3
1Department of Physiology and Biophysics, University of California, Irvine, Irvine, CA 92697, USA.
Cell Reports
|February 27, 2020
Summary
Researchers developed novel bifunctional antibodies (VHHs) to neutralize deadly botulinum neurotoxins (BoNT). These engineered VHHs offer enhanced potency and improved therapeutic potential against BoNT intoxication.
Area of Science:
- Immunology
- Toxicology
- Structural Biology
Background:
- Botulinum neurotoxin (BoNT) is a highly lethal agent requiring effective antitoxins.
- Single-domain antibodies (VHHs) show promise as stable and producible BoNT countermeasures.
Purpose of the Study:
- To investigate the structures and neutralization mechanisms of VHHs against BoNT/A1 and BoNT/B1.
- To design and evaluate enhanced bifunctional VHHs for improved therapeutic efficacy.
Main Methods:
- Structural analysis of six unique VHHs targeting BoNT/A1 and BoNT/B1.
- Design of heterodimeric VHHs with flexible linkers for simultaneous toxin binding.
- Assessment of VHH potency in a mouse co-intoxication model.
Main Results:
- Identified diverse VHH neutralization mechanisms, including blocking receptor binding and protease domain delivery.
- Demonstrated that simultaneously binding bifunctional VHHs exhibit significantly greater potency than non-simultaneous binders.
- Validated the therapeutic potential of engineered VHHs against BoNT intoxication.
Conclusions:
- Understanding VHH neutralization mechanisms provides insights into antibody-based BoNT therapy.
- Engineered multivalent VHHs offer a promising strategy for developing more potent anti-BoNT therapeutics.
Keywords:
VHHantitoxinbifunctional antibodybotulinum neurotoxinneutralizing epitopesingle-domain antibodystructure-based designMore Related Videos
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