Scalable, robust, high-throughput expression & purification of nanobodies enabled by 2-stage dynamic control

Area of Science:

• Biotechnology
• Molecular Biology
• Protein Engineering

Background:

• Nanobodies (VHHs) are valuable tools in diagnostics, therapeutics, and research.
• Producing pure nanobodies is often difficult due to issues with protein folding and aggregation in E. coli.
• Cytoplasmic expression challenges include disulfide bond reduction leading to insolubility.

Purpose of the Study:

• To engineer a robust system for high-level, soluble cytoplasmic expression of nanobodies in E. coli.
• To simplify downstream purification processes for efficient nanobody production.
• To accelerate the development and application of nanobody technology.

Main Methods:

• Utilized engineered E. coli strains with controlled cytoplasmic redox potential.
• Implemented a two-stage expression and purification process.
• Incorporated cell lysis enzymes and dynamic control of protein folding catalysts.

Main Results:

• Achieved improved, consistent, and soluble cytoplasmic nanobody expression.
• Demonstrated rapid cell autolysis and simplified purification.
• Successfully scaled nanobody production from microtiter plates to bioreactors.

Conclusions:

• The engineered E. coli system provides a scalable and efficient method for nanobody production.
• This approach overcomes common challenges in recombinant protein expression.
• The system is expected to significantly expedite nanobody development and application.