Two-Chain Protein Production Using Chaperone Mediators
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Solution Overview
Problem
Current methods for producing recombinant two-chain proteins, such as antibodies, in prokaryotic host cells face challenges in achieving proper folding and assembly, leading to inclusion body formation and inefficiencies in industrial-scale production.
Innovation Solution
The use of optimized expression vectors and culture processes involving chaperone proteins like peptidyl-prolyl isomerases and protein disulfide oxidoreductases, along with specific temperature and agitation conditions, to facilitate the folding and assembly of two-chain proteins in prokaryotic host cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional expression vectors are used in prokaryotic host cells, then production scale can be increased, but proper folding and assembly of two-chain proteins is compromised leading to inclusion body formation
Solution Approach 1:
The patent introduces chaperone proteins as intermediary molecules that mediate between the expressed two-chain proteins and proper folding/assembly. These chaperones act as molecular assistants that facilitate correct conformational changes and disulfide bond formation, enabling high-yield production while maintaining protein quality that would otherwise form inclusion bodies.
Solution Approach 2:
The patent employs temperature shift strategy where cells are grown at a first temperature and then shifted to a second temperature to induce chaperone expression and trigger proper folding. This temporal parameter change allows separation of cell growth phase from protein folding phase, enabling scalable production while ensuring proper assembly through controlled environmental conditions.
2Productivity
If expression levels are increased for industrial production, then productivity improves, but protein aggregation and inclusion body formation increase
Solution Approach 1:
Chaperone proteins serve as protective intermediaries that prevent aggregation of high-concentration expressed proteins. By introducing these intermediary molecules, the system can maintain high expression levels for industrial productivity while the chaperones ensure proteins fold correctly and remain biologically active, preventing the reliability loss that would otherwise occur at high concentrations.
Solution Approach 2:
The patent implements prior cushioning by pre-expressing or co-expressing chaperone proteins before the two-chain proteins are fully expressed. This preparatory measure creates a protective molecular environment in advance, cushioning against the aggregation tendency that arises when protein concentration increases for industrial production, thereby maintaining biological activity throughout the high-yield production process.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly enhances the production of biologically active two-chain proteins, achieving a 10-fold gain in production levels and improving the robustness of the process beyond vector improvements.
Implementation Method 1
at least one chaperone protein selected from the group consisting of peptidyl-prolyl isomerases, protein disulfide oxidoreductases, and combinations thereof
Implementation Method 2
at least one chaperone protein selected from the group consisting of peptidyl-prolyl isomerases, protein disulfide oxidoreductases, and combinations thereof
Implementation Method 3
the growth temperature is from 2 to 10° C. above the production temperature
Implementation Method 4
the growth agitation rate is from 50 to 250 rpm above the production agitation rate
Data Source
AI summary
Provided herein are methods of producing a polypeptide containing two chains, such as an antibody including a light chain and a heavy chain. In particular, methods are provided for producing heterologous secretory proteins in bacteria through utilization of optimized expression vectors and culture processes.