Host Cell Knockout for Protein Yield
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Solution Overview
Problem
Current methods for improving protein yield in host cells are limited and often involve complex processes, with mechanisms such as folding, disulfide bond formation, glycosylation, transport, and release being not fully understood, leading to suboptimal protein production.
Innovation Solution
Engineering host cells to underexpress specific knockout proteins (KO proteins) such as KO1, KO2, and KO3, which are identified to have a negative impact on protein yield, thereby increasing the production and secretion of proteins of interest by modifying their gene expression levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional methods (overexpression of chaperones, PDI, HAC1) are used to improve protein yield, then protein production increases, but process complexity increases and mechanisms remain not fully understood
Solution Approach 1:
Instead of overexpressing proteins to increase yield, this invention knocks out specific genes (FLO8, HCH1, SCJ1) that negatively impact protein secretion. The inverted approach of removing detrimental factors rather than adding beneficial ones simplifies the process while achieving 20-300% yield increases in Pichia pastoris systems.
Solution Approach 2:
The invention extracts and removes specific problematic proteins from the host cell system through gene knockout. By taking out FLO8, HCH1, and SCJ1 genes that interfere with secretory pathway efficiency, the system achieves improved protein yield without the complexity of managing multiple overexpressed components.
2Productivity
If multiple chaperone proteins and PDI are co-expressed to enhance secretion, then protein yield increases, but the mechanism is not fully understood and process becomes complex
Solution Approach 1:
Rather than attempting to understand and optimize the complex interactions of multiple overexpressed proteins, this invention inverts the approach by identifying and knocking out specific genes that actively hinder secretion. This simplifies the system to a more manageable state with clearer mechanistic insights into what prevents rather than promotes secretion.
3Productivity
If gene knockout approach is used to underexpress KO proteins, then protein yield increases significantly (20% or greater), but requires genetic engineering of host cell
Solution Approach 1:
The invention removes specific detrimental genes (FLO8, HCH1, SCJ1) from the host cell genome through targeted knockout techniques. This extraction of problematic genetic elements achieves 20-300% yield improvements while using well-established genetic engineering methods that are becoming increasingly routine in biomanufacturing.
Data Source
AI summary
The present invention is in the field of recombinant biotechnology, in particular in the field of protein expression. The invention generally relates to a method of expressing a protein of interest (POI) from a host cell. The invention relates particularly to improving a host cell's capacity to express and/or secrete a protein of interest and use of the host cell for protein expression. The invention also relates to cell culture technology, and more specifically to culturing cells to produce desired molecules for medical purposes or food products.