Antibody expression kinetics in glycoengineered Pichia pastoris

Area of Science:

• Biotechnology
• Bioprocess Engineering
• Molecular Biology

Background:

• The growing antibody market necessitates efficient expression systems.
• Glycoengineered yeast, like Pichia pastoris, are explored for antibody production.
• Current titers in yeast are lower than for antibody fragments in fungal systems.

Purpose of the Study:

• To develop a simplified approach for estimating antibody secretion kinetics.
• To predict oxygen uptake rate requirements based on growth rate.
• To model cultivation performance for large-scale bioprocess development.

Main Methods:

• Utilized a growth-rate-controlled, methanol-limited fed-batch fermentation in glycoengineered Pichia pastoris.
• Estimated antibody secretion kinetics and oxygen uptake rates.
• Developed a mass balance model incorporating specific growth rate and productivity correlations.

Main Results:

• Biomass yield from methanol and specific oxygen requirements align with wild-type P. pastoris.
• Specific productivity showed a non-linear relationship with specific growth rate.
• The model successfully predicted cultivation performance under oxygen-limited conditions.

Conclusions:

• The intrinsic yields of Pichia pastoris are independent of glycoengineering or protein expression.
• The empirical correlation between specific growth rate and productivity is crucial for modeling.
• This simplified modeling approach aids in predicting large-scale performance and optimizing bioprocess development for antibody production.