Protein Destabilizer Selection via Cell Survival Assay
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Solution Overview
Problem
Conventional reporter assays for identifying agents that downregulate proteins of interest often suffer from spurious results due to more trivial ways to downregulate than upregulate, leading to artifacts and inefficiencies in identifying effective destabilizing agents.
Innovation Solution
Development of 'up' assays that utilize cell survival as a positive indicator by employing recombinant fusion constructs with a cytotoxic element fused to a protein of interest, where the degradation of the fusion construct promotes cell survival, allowing for the identification of test agents that destabilize the protein of interest through increased cell viability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional down assays are used to identify agents that downregulate proteins of interest, then the ability to detect protein downregulation is achieved, but spurious results and artifacts increase due to more trivial ways to downregulate than upregulate
Solution Approach 1:
The patent inverts the conventional down assay approach by creating an up assay where cells express a fusion protein containing both the protein of interest and a cytotoxic element. Instead of detecting decreased signal from protein downregulation, the assay detects increased cell survival when the protein is destabilized. This inversion transforms a negative selection assay prone to artifacts into a positive selection assay with improved reliability and fewer spurious results.
2Difficulty of detecting and measuring
If down assays measure decrease in reporter protein signal to identify hits, then the ability to detect protein downregulation is achieved, but the complexity of distinguishing true hits from artifacts increases
Solution Approach 1:
The patent converts the harmful cytotoxic element into a beneficial reporting mechanism. By fusing the cytotoxic element to the protein of interest, the harmful effect (cell death) becomes the useful signal for detecting protein stability. When the protein is destabilized, the cytotoxic element is also degraded, leading to cell survival. This transformation simplifies hit detection by converting a complex signal interpretation problem into a straightforward cell survival readout.
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
The 'up' assays effectively identify test agents that destabilize proteins of interest by using cell survival as a positive selection method, reducing artifacts and improving the accuracy of hit identification in high-throughput screening.
Implementation Method 1
providing cells expressing a recombinant fusion protein comprising a POI and an enzyme, wherein the enzyme converts an exogenous substrate that is not toxic to the cells into a product that is toxic to the cells
Data Source
AI summary
The present application relates, in some aspects, to the development of an assay that uses cell survival and/or cell viability as a phenotypic identifier to positively select for agents that destabilize a protein of interest.