E. coli Growth Rate Control for Recombinant Protein Partitioning
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Solution Overview
Problem
The challenge in recombinant protein production in E. coli is the inefficient partitioning of proteins between the periplasm and the culture supernatant, leading to reduced yield and quality due to protein leakage, increased viscosity, and contamination, which complicates downstream processing.
Innovation Solution
Controlling the growth rate of E. coli host cells allows for the adjustment of protein partitioning between the supernatant and the periplasm, optimizing the distribution to enhance yield and quality by selecting a suitable growth rate that maximizes protein recovery during fermentation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high levels of recombinant protein leak into the supernatant, then the availability of protein for recovery increases, but the viscosity of the supernatant increases making primary recovery more difficult and reducing yield
Solution Approach 1:
The patent applies parameter changes by controlling the growth rate of E. coli host cells to optimize the partitioning of recombinant protein between periplasm and supernatant. By adjusting growth rate parameters, the system achieves optimal protein distribution that balances availability for recovery with manageable supernatant viscosity, thereby resolving the contradiction between protein quantity and recovery efficiency
2Quantity of substance
If high levels of recombinant protein leak into the supernatant, then the protein is more accessible for recovery, but the cells become less robust during centrifugation and are more likely to lyse resulting in damage to the protein
Solution Approach 1:
The patent controls the growth rate parameter of E. coli host cells to optimize protein partitioning, which indirectly maintains cell robustness. By achieving optimal protein distribution in the periplasm through growth rate control, the system reduces the need for high-speed centrifugation that would compromise cell integrity, thereby preventing cell lysis and protein damage while maintaining protein accessibility
3Quantity of substance
If high levels of recombinant protein leak into the supernatant, then the protein is more available for recovery, but the quality of the protein recovered from the periplasm is reduced by contamination with recombinant protein from the supernatant
Solution Approach 1:
The patent applies parameter changes by controlling growth rate to optimize protein partitioning between periplasm and supernatant. This control mechanism ensures that sufficient protein is available in the periplasm for recovery while minimizing leakage into the supernatant, thereby maintaining high protein quality without contamination. The growth rate parameter serves as a control variable that simultaneously affects both protein availability and quality
Data Source
AI summary
The present invention provides a method for controlling the partitioning of a recombinant protein between the supernatant and the periplasm in E. coli host cell cultures wherein expression of the recombinant protein by said cells is under the control of an inducible system, which method comprises: a) providing an E. coli host cell culture b) changing the growth rate of the E. coli host cells c) inducing expression of the recombinant protein wherein steps (b) and (c) can be performed in any order or simultaneously; and subsequently d) determining the yield of recombinant protein in the culture supernatant and the E. coli host cell periplasm e) comparing the yield determined in step (d) with the yield determined when at least one other growth rate has been used in step (b) f) selecting a growth rate from the comparison made in step (e) in which the partitioning of the recombinant protein between the supernatant and the periplasm is most suited to the primary recovery of the recombinant protein.