Turning a Negative into a Positive: Conversion of a Homodimer into a Heterodimer Using Negative State Repertoires

Area of Science:

• Biochemistry
• Structural Biology
• Protein Engineering

Background:

• Bispecific antibodies offer therapeutic advantages by targeting multiple antigens simultaneously.
• Engineering stable and pure bispecific antibodies presents significant challenges in protein design.

Purpose of the Study:

• To develop a computational protein design strategy for creating high-purity bispecific antibodies.
• To demonstrate the efficacy of multistate design with negative state repertoires in antibody engineering.

Main Methods:

• Utilized multistate computational protein design incorporating negative state repertoires.
• Employed rational selection of additional mutations to optimize antibody assembly.
• Applied structural biology techniques to analyze antibody heterodimer formation and purity.

Main Results:

• Successfully engineered bispecific antibodies capable of forming heterodimers.
• Achieved up to 93% purity in the assembled antibody heterodimers.
• Demonstrated the effectiveness of the computational design approach in producing specific protein structures.

Conclusions:

• Multistate computational protein design with negative state repertoires is a powerful tool for engineering bispecific antibodies.
• The developed method enables the production of highly pure antibody heterodimers, with potential for therapeutic applications.
• This study advances the field of protein engineering by providing a robust computational strategy for complex antibody design.