An important consideration when expressing mAbs in Escherichiacoli.

Area of Science:

• Biotechnology
• Molecular Biology
• Protein Engineering

Background:

• Monoclonal antibodies (mAbs) are crucial biopharmaceuticals, typically produced in mammalian cells.
• There is growing interest in using alternative hosts like Escherichia coli for mAb production.
• Expression in E. coli can result in truncated heavy chains alongside full-length products.

Purpose of the Study:

• To investigate the role of codon optimization in the formation of truncated heavy chains during mAb production in E. coli.
• To analyze how different codon optimization algorithms impact product integrity.
• To identify strategies for avoiding truncated mAb variants.

Main Methods:

• Analysis of amino acid sequences from several therapeutic mAbs.
• Application of multiple codon optimization algorithms.
• Evaluation of algorithm-generated sequences for potential truncation sites.

Main Results:

• Several codon optimization algorithms were found to incorporate sequences that result in truncated heavy chain formation.
• The study identified specific algorithmic patterns contributing to the truncation issue.
• The frequency and nature of truncation varied depending on the algorithm used.

Conclusions:

• Codon optimization strategies must be carefully selected to avoid unintended truncation of therapeutic mAbs in E. coli.
• Understanding the impact of optimization algorithms is critical for successful recombinant protein production.
• Developing improved codon optimization approaches is necessary for efficient E. coli-based mAb manufacturing.