Rapid screening platform for stabilization of scFvs in Escherichia coli

Area of Science:

• Biotechnology
• Protein Engineering
• Immunology

Background:

• Antibody fragments like single-chain variable fragments (scFvs) and diabodies possess poor biophysical properties, limiting their therapeutic applications.
• Insufficient thermal stability leads to issues such as poor expression, low solubility, and protein aggregation.

Purpose of the Study:

• To develop a general platform for enhancing the stability of antibody fragments.
• To improve the therapeutic utility of antibody fragments by addressing their inherent stability limitations.

Main Methods:

• Engineered Escherichia coli to secrete scFvs directly into culture media.
• Applied automated screening to evaluate rational, sequence-based, and structure-based stability design strategies.
• Assessed stability through empirical evaluation of various design approaches.

Main Results:

• Stabilized antibody fragments exhibited improved expression and enhanced durability during purification, handling, and storage.
• The developed platform successfully engineered greater stability into antibody fragments.
• Stabilized fragments serve as effective building blocks for complex antibody-like molecules.

Conclusions:

• The developed platform offers a robust method for engineering stability into antibody fragments.
• Enhanced antibody fragment stability broadens their potential as therapeutic agents.
• This approach facilitates the development of more stable and effective antibody-based therapeutics.