The Degradation of Botulinum Neurotoxin Light Chains Using PROTACs

Area of Science:

• Biochemistry
• Molecular Biology
• Neuroscience

Background:

• Botulinum neurotoxins (BoNTs) are potent neurotoxins causing flaccid paralysis by blocking synaptic vesicle release.
• Certain BoNT serotypes, like A and B, induce paralysis lasting months, leading to clinical applications.
• There's a need for engineered BoNTs with controlled duration and novel applications.

Purpose of the Study:

• To investigate using proteolysis-targeting chimeras (PROTACs) to modulate the persistence of recombinant botulinum neurotoxins.
• To develop complementary strategies for botulism treatment by targeting BoNTs.

Main Methods:

• Utilized small-molecule PROTACs to induce proteasomal degradation of botulinum neurotoxin light chains.
• Engineered a camelid heavy chain antibody to bind both botulinum neurotoxin and PROTACs for targeted degradation.

Main Results:

• Demonstrated proof of principle for using PROTACs to fine-tune botulinum neurotoxin persistence.
• Showcased a dual-targeting antibody-PROTAC system for enhanced therapeutic potential.

Conclusions:

• Proteolysis-targeting chimeras offer a viable method for controlling botulinum neurotoxin duration.
• Engineered antibodies combined with PROTACs present a novel approach for botulism treatment and BoNT-based therapies.