Plasma-Based Multiplexed Radical Labeling for Protein Footprinting
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Solution Overview
Problem
Current protein footprinting techniques, such as Hydrogen Deuterium Exchange (HDX) and Hydroxyl Radical Protein Footprinting (HRF), face limitations in resolution and throughput due to shortcoming in labeling all amino acids effectively, with HRF typically only labeling 6 out of 20 amino acids, resulting in limited data resolution.
Innovation Solution
The development of plasma-based methods for multiplexed labeling of biological molecules using trifluoromethyl, hydroxyl, and nitro radicals, which involves generating plasma in a sample containing radical precursors like sodium triflinate and hydrogen peroxide to label proteins simultaneously with multiple radical species, enhancing labeling coverage and resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hydroxyl radical protein footprinting (HRF) is used for protein labeling, then the labeling process is simple and fast, but the resolution is limited because only 6 out of 20 amino acids are labeled
Solution Approach 1:
The patent combines three different radical precursors (sodium triflinate for CF3 radicals, hydrogen peroxide for OH radicals, and sodium nitrite for NO2 radicals) into a single reaction system. This merging allows simultaneous generation of multiple radical types that can label different amino acid residues, thereby improving resolution while maintaining the simplicity and speed of the footprinting approach
Solution Approach 2:
The plasma irradiation system serves multiple functions: it simultaneously activates multiple radical precursors, generates multiple types of radicals, and enables comprehensive labeling of diverse amino acid residues. This multi-functionality allows a single experimental approach to achieve what previously required multiple separate experiments
2Measurement precision
If multiple radical precursors are combined in a single sample, then all 20 amino acids can be labeled simultaneously improving resolution, but the device complexity increases due to plasma generation requirements
Solution Approach 1:
The patent replaces complex chemical activation systems with plasma irradiation. Instead of using multiple separate chemical reactions or enzymatic systems to generate different radicals, a single plasma source simultaneously activates all radical precursors through high-energy electron collisions and radical reactions, simplifying the overall system architecture
Solution Approach 2:
The plasma system allows independent control of irradiation time, power, and gas composition to optimize the generation of different radical types. By adjusting plasma parameters, the system can tune the relative abundance of CF3, OH, and NO2 radicals to achieve optimal labeling for different experimental conditions
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 the labeling of all 20 amino acids, significantly improving the resolution and coverage of protein footprinting data, enabling more comprehensive structural and interaction analysis of proteins.
Implementation Method 1
generating a plasma in the sample, thereby converting the two or more radical precursors in the sample into trifluoromethyl and hydroxyl radicals
Implementation Method 2
converting the two or more radical precursors in the sample into trifluoromethyl and hydroxyl radicals
Data Source
AI summary
Provided herein are materials and methods for plasma-based multiplexed labeling of biological molecules. In some aspects, provided herein is an optimized method for simultaneous labeling of proteins with trifluoromethyl, nitro, and hydroxyl radicals generated by a plasma in a single reaction vial, such as for protein footprinting.