Polypeptide Variant Selection via Simultaneous Stability Pressures
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for selecting polypeptide variants with improved stability and retained functionality are limited by the use of single stability selection pressures, which may not effectively destabilize all proteins, leading to incomplete selection of stable variants.
Innovation Solution
The use of multiple stability selection pressures, such as DTT, hydrophobic interaction chromatography (HIC), and increased temperature, simultaneously applied during translation and selection, to identify and select polypeptide variants that are more stable and retain functional activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple stability selection pressures are applied simultaneously, then selection stringency and effectiveness are improved, but device complexity and process difficulty increase
Solution Approach 1:
The patent combines multiple stability selection pressures (DTT treatment, hydrophobic interaction chromatography, temperature control) into a single integrated selection process. These pressures are applied simultaneously or sequentially in a unified workflow, allowing the system to achieve high selection stringency while managing complexity through coordinated integration rather than separate independent processes.
Solution Approach 2:
The selection system is designed to handle multiple types of stability pressures through a universal framework. The same basic infrastructure (translation system, selection apparatus) can apply different combinations of pressures (chemical, physical, chromatographic) to select for various stability traits, making the system adaptable and reducing overall complexity through reuse of core components.
2Reliability
If multiple stability selection pressures are applied simultaneously, then selection stringency is improved, but ease of operation deteriorates
Solution Approach 1:
The patent prepares and optimizes all selection pressure conditions in advance before the actual selection process. Buffer compositions, chromatography conditions, and temperature parameters are predetermined and standardized, allowing the complex multi-pressure selection to be executed as a streamlined protocol rather than requiring real-time complex adjustments.
3Ease of operation
If single stability selection pressure is used, then ease of operation is maintained, but selection completeness deteriorates
Solution Approach 1:
The patent divides the stability selection process into distinct modular stages, each applying a specific type of pressure (e.g., DTT treatment stage, HIC stage, temperature stage). This segmentation allows the complex multi-pressure selection to be broken down into manageable steps that can be performed sequentially, maintaining operational simplicity while achieving comprehensive selection through the cumulative effect of multiple specialized stages.
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 allows for a more stringent and generic selection method, enabling the identification of stable polypeptide variants that maintain functional activity, as demonstrated with improved variants of human erythropoietin (EPO), granulocyte macrophage colony-stimulating factor (GM-CSF), and granulocyte colony-stimulating factor (G-CSF), resulting in enhanced stability and shelf-life, as well as reduced aggregation and increased efficacy.
Implementation Method 1
The use of multiple stability selection pressures, such as DTT, hydrophobic interaction chromatography (HIC), and increased temperature
Implementation Method 2
hydrophobic interaction chromatography (HIC)
Implementation Method 3
The use of multiple stability selection pressures, such as DTT, hydrophobic interaction chromatography (HIC), and increased temperature
Data Source
AI summary
A method of providing a subject polypeptide variant with improved stability compared with a parent subject polypeptide, employing translation and selection using an RNA expression system, wherein two or more stability selection pressures are applied simultaneously during translation, two or more stability selection pressures are applied simultaneously during selecting, or at least one stability selection pressure is applied during translation and continues to be applied during selecting, and at least one further stability selection pressure is applied during selecting.