Protein Stabilization via Redox Potential Control
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Solution Overview
Problem
The high cost of producing recombinant therapeutic proteins in mammalian cell expression systems is exacerbated by product dissociation events, which reduce protein stability and activity, and existing quality control methods fail to detect these issues effectively.
Innovation Solution
Maintaining a redox potential difference in the range of −50 mV to −300 mV during cell separation and supernatant collection, while controlling oxygen levels and temperature, and adding specific transition metals and antioxidants to the production culture, to inhibit polypeptide dissociation and enhance protein stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional production methods are used without redox control, then production cost is reduced (simpler process), but product dissociation increases leading to lower stability and activity
Solution Approach 1:
The patent applies parameter changes by controlling the redox potential of the production culture through adjusted oxygen transfer rates and dissolved oxygen levels. By maintaining specific redox potential ranges (e.g., −50 mV to −300 mV), the process prevents polypeptide dissociation while managing production complexity through measurable and controllable parameters.
Solution Approach 2:
The patent implements feedback control by monitoring redox potential, dissolved oxygen levels, and oxygen transfer rates, then adjusting these parameters to maintain optimal conditions. This closed-loop approach ensures product stability while providing a systematic method to manage process complexity through real-time measurements and adjustments.
2Quantity of substance
If sparging is used to increase oxygen levels, then dissolved oxygen tension increases, but redox potential is substantially altered affecting product stability
Solution Approach 1:
The patent applies dynamics by implementing time-varying oxygen transfer rates that adapt to different production phases. During exponential growth, higher oxygen levels are provided, while during production phase, oxygen transfer is controlled to maintain specific redox potentials. This dynamic approach allows dissolved oxygen tension to be increased when needed while preventing redox potential alterations that would compromise product stability.
Solution Approach 2:
The patent applies preliminary action by establishing appropriate redox potential conditions before product dissociation occurs. By pre-controlling oxygen levels and redox potential during critical production phases, the system prevents dissociation events rather than correcting them afterward, ensuring product stability while managing oxygen requirements.
3Productivity
If temperature is maintained at normal culture levels, then cell growth is optimal, but product dissociation and aggregation increase
Solution Approach 1:
The patent applies dynamics by implementing temperature shifts that adapt to different production phases. During exponential growth, cells are maintained at optimal temperatures for rapid proliferation. During the production phase, temperature is reduced to prevent polypeptide dissociation and aggregation. This dynamic temperature control allows the system to achieve both high productivity during growth and high product stability during production.
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 results in increased production yields and improved protein quality by reducing dissociation, aggregation, and misfolding, leading to a higher concentration of properly folded and stable proteins.
Implementation Method 1
maintaining a redox potential difference in the range of −50 mV to −300 mV from a non-stabilized product to a stabilized product during separation of cells from production culture and collection of a supernatant
Data Source
AI summary
The present disclosure features methods and compositions for increasing the amount of products of cellular metabolism, e.g., proteins, by lowering the temperature of cells expressing the product at one or more steps while culturing the cells, expressing the product, and/or recovering the product.