Development of a novel engineered E. coli host cell line platform with improved column capacity performance for...

Area of Science:

• Biotechnology
• Bioprocess Engineering
• Protein Purification

Background:

• Downstream purification is a major cost in recombinant protein production.
• Host cell proteins (HCPs) can interfere with chromatography and increase purification costs.
• Minimizing HCP burden is crucial for efficient recombinant protein manufacturing.

Purpose of the Study:

• To analyze an engineered Escherichia coli (E. coli) strain designed to reduce host cell protein (HCP) burden.
• To evaluate the impact of reduced HCPs on recombinant protein purification via column chromatography.
• To assess if cell growth and recombinant protein expression are maintained or improved in the engineered strain.

Main Methods:

• Engineered an E. coli strain (LTSF06) with strategic gene deletions.
• Transformed the strain to express three different recombinant biologics and a model protein.
• Assessed cell growth, recombinant protein expression, and HCP adsorption on DEAE ion exchange chromatography medium.
• Performed breakthrough analysis to quantify target protein capture efficiency.

Main Results:

• Engineered E. coli strain maintained or increased cell growth levels for all constructs.
• A significant reduction in HCP adsorption to the chromatography medium was achieved.
• Breakthrough analysis revealed a 37% increase in target protein capture due to reduced adsorption of specific HCPs.
• The strategy focused on HCPs with particular adsorption/elution characteristics, not those co-eluting with the target protein.

Conclusions:

• Engineered E. coli strains with reduced HCPs offer a viable strategy to improve recombinant protein purification efficiency.
• Minimizing specific HCP adsorption significantly enhances target protein capture in chromatography.
• This approach positively impacts the overall purification process by reducing costs and increasing yield.