Cellular Assay Using Nucleic Acid Tag for Protein Detection
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Solution Overview
Problem
Current methods for detecting protein modifications and identifying compounds that modulate protein activity are limited in their ability to specifically assess the presence and activity of modified proteins, particularly in cellular processes such as phosphorylation, which is crucial for understanding kinase activity and signaling pathways.
Innovation Solution
A method involving a detectable protein with a nucleic acid interacting motif, an antibody immobilized on a solid support that binds specifically to modified proteins, and a nucleic acid oligomer that binds to the motif, allowing for the detection of protein modifications and the assessment of compound effects on these processes, including kinase activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional detection methods are used to detect protein modifications, then the detection process is simple, but the measurement precision and specificity are insufficient
Solution Approach 1:
The assay is divided into distinct functional modules: (1) detectable protein with nucleic acid interacting motif, (2) immobilized antibody for specific binding, (3) nucleic acid oligomer for motif detection, and (4) solid support system. This segmentation allows each component to perform its specific function optimally while maintaining overall assay precision.
Solution Approach 2:
The nucleic acid interacting motif serves as an intermediary element that bridges the target protein and the detection system. The motif can be specifically bound by nucleic acid oligomers, enabling indirect but highly specific detection of protein modifications with enhanced measurement precision.
2Reliability
If specific antibodies are used to bind modified proteins, then the detection specificity is improved, but the device complexity increases due to immobilization requirements
Solution Approach 1:
The antibody is immobilized on the solid support to perform its binding function autonomously. The immobilized antibody automatically captures modified proteins from the sample without requiring additional manipulation, maintaining high detection reliability while simplifying the operational procedure.
Solution Approach 2:
The assay replaces complex mechanical manipulation steps with a static immobilized antibody system. The antibody remains fixed on the solid support, allowing samples to be simply added and incubated, thereby maintaining reliability while reducing operational complexity.
3Measurement precision
If nucleic acid oligomers are used to bind motifs, then the detection precision is improved, but the assay complexity increases
Solution Approach 1:
The nucleic acid interacting motif serves multiple functions: it is integrated into the detectable protein structure, provides a specific binding site for nucleic acid oligomers, and enables amplification or detection through nucleic acid-specific methods. This multi-functionality maintains precision while streamlining the assay procedure.
Solution Approach 2:
The nucleic acid oligomer acts as a copy or replica of the motif's binding interface. By designing oligomers that specifically recognize and bind the motif, the system achieves high detection precision through nucleic acid hybridization principles, which are well-established and easy to optimize.
4Measurement precision
If multiple binding steps are used to detect modified proteins, then the measurement precision is improved, but the time required for detection increases
Solution Approach 1:
The antibody is pre-immobilized on the solid support before the assay begins. This preliminary preparation eliminates the need for antibody addition and mixing steps during the actual detection, maintaining high precision while reducing the time required for the core detection process.
Solution Approach 2:
The assay merges multiple functions into integrated components: the detectable protein contains both the target epitope and the nucleic acid interacting motif, allowing simultaneous binding of antibody and oligomer. This merging reduces the number of separate steps required while maintaining detection precision.
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 method enables precise detection of protein modifications and the identification of compounds that modulate kinase activity, providing insights into cellular processes and potential therapeutic targets by accurately measuring the presence and activity of modified proteins.
Implementation Method 1
an antibody that is directly or indirectly immobilised on a solid support and which immunospecifically binds the target protein that has been modified by the cellular process of interest
Implementation Method 2
a nucleic acid oligomer comprising a nucleic acid sequence that binds the nucleic-acid interacting motif
Data Source
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AI summary
Provided herein are assays useful, for example, for determining the activity of a protein involved in a cellular process. In some embodiments, the activity of the protein is assessed using a nucleic acid tag, and in particular, by detecting the presence of a nucleic acid tag. Such assays can be used, for example, to study the effects of test compounds as modulators, e.g., inhibitors, agonists and antagonists, of protein activity.