Plasma-Mediated Radical Labeling for In Vivo Membrane Protein Analysis
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Solution Overview
Problem
Current techniques for studying protein higher order structure and binding information, such as radical footprinting, have not been successfully applied for in vivo labeling of cell membrane proteins, due to challenges like insolubility and multiple transmembrane domains.
Innovation Solution
A method involving the generation of plasma in a sample containing live cells, which produces hydroxyl radicals that interact with and label cell membrane proteins, thereby overcoming the limitations of existing techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional radical footprinting techniques are used, then protein structure information can be obtained, but in vivo labeling of cell membrane proteins cannot be achieved due to insolubility and transmembrane domain challenges
Solution Approach 1:
The patent introduces plasma as an intermediary that generates hydroxyl radicals capable of penetrating cell membranes and labeling proteins in their native environment. The plasma acts as a mediator that overcomes the insolubility issue by generating radicals in situ within the cellular environment, allowing labeling of transmembrane domains without requiring protein extraction or solubilization
Solution Approach 2:
The patent changes the physical state and generation method of radicals from conventional chemical sources to plasma-generated hydroxyl radicals. This parameter change enables radicals to be produced directly in the aqueous cellular environment, making the technique applicable to insoluble membrane proteins while maintaining reliability of labeling
2Measurement precision
If high-resolution techniques like cryo-EM and x-ray crystallography are used, then atomic resolution structure information is obtained, but large sample requirements and crystallization time limit throughput
Solution Approach 1:
The patent replaces complex mechanical and crystallization processes with plasma-based radical generation and mass spectrometry detection. This substitution eliminates the need for large sample quantities and time-consuming crystallization steps while maintaining high measurement precision through direct in vivo labeling and MS-based structural analysis
Solution Approach 2:
The patent changes the detection parameter from requiring large sample volumes and crystalline states to using sensitive mass spectrometry detection of plasma-labeled proteins. This parameter change enables high-throughput analysis by reducing sample requirements and eliminating crystallization steps while preserving structural resolution through precise mass spectral measurements
3Productivity
If footprinting is used for dynamic protein samples, then throughput is improved, but atomic resolution and epitope-level detail are lost
Solution Approach 1:
The patent uses plasma-generated hydroxyl radicals as an intermediary that provides both high throughput and high resolution. The radicals serve as a versatile labeling agent that can rapidly label diverse protein regions while mass spectrometry detection provides atomic-level precision, combining the advantages of both footprinting and high-resolution techniques
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 allows for effective in vivo labeling of cell membrane proteins, enabling the investigation of their higher order structure and binding information in their native environment, which was previously unattainable with existing technologies.
Implementation Method 1
generating a plasma in the sample, thereby producing hydroxyl radicals in the sample
Implementation Method 2
producing hydroxyl radicals in the sample which interact with cell membrane proteins
Data Source
AI summary
Provided herein are materials and methods for in vivo labeling of membrane proteins using plasma-induced modification of biomolecules (PLIMB).