Protein Conformational Analysis via Limited Proteolysis
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Solution Overview
Problem
Current methods are inadequate for monitoring protein conformational changes in their native cellular environment, limiting understanding of protein function and disease diagnosis, particularly for protein-centric diseases like Parkinson's and Alzheimer's, due to the inability to study protein folds in complex biological contexts.
Innovation Solution
A method combining limited proteolysis with advanced targeted mass spectrometry, specifically using selected reaction monitoring (SRM) or SWATH-MS, to identify and quantify protein conformational changes in native cellular contexts, enabling the detection of conformations in complex biological matrices without perturbation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional biophysical techniques (NMR, X-ray crystallography, fluorescence spectroscopy) are used to monitor protein conformation, then conformational features can be analyzed in detail, but the methods are limited to purified proteins in vitro and cannot handle complex biological backgrounds
Solution Approach 1:
The patent introduces fluorescent probes as intermediary molecules that bind to specific sites on proteins. These probes act as mediators between the protein and the detection system, enabling conformational monitoring in complex cellular environments. The probes transfer conformational information to fluorescent signals that can be detected despite the presence of other cellular components
Solution Approach 2:
The patent replaces traditional mechanical/biophysical measurement systems (NMR, X-ray) with optical detection systems (fluorescence spectroscopy, FRET). This substitution enables the study of proteins in their native cellular context where the original mechanical methods cannot operate due to complexity and interference from other cellular components
2Adaptability or versatility
If FRET-based methods are used to monitor conformational changes in native cellular environment, then proteins can be studied in their native context, but fluorescent probes must be introduced at suitable sites of each target protein, making the method not applicable on large scale or to clinical samples
Solution Approach 1:
The patent employs fluorescent probes that can be introduced into cells through natural processes or non-invasive methods, allowing the system to serve itself without complex manual intervention. The probes are designed to accumulate or be activated within cells through physiological mechanisms, reducing the need for sophisticated probe delivery systems
Solution Approach 2:
The patent utilizes changes in fluorescent parameters (intensity, wavelength, polarization) to detect conformational changes. By monitoring these parameter changes rather than requiring complex structural analysis, the method simplifies the detection process and enables high-throughput analysis of multiple proteins and conditions
3Productivity
If mass spectrometry-based proteomic techniques are used to probe cellular protein concentration, then protein abundance changes can be routinely measured, but conformational changes of proteins remain largely unknown due to lack of suitable approaches
Solution Approach 1:
The patent segments the protein analysis into two independent dimensions: protein abundance (measured by mass spectrometry) and protein conformation (measured by fluorescent probes). This segmentation allows both types of information to be obtained simultaneously using their respective optimized methods, preventing the loss of conformational data while maintaining high throughput for abundance analysis
Solution Approach 2:
The patent merges mass spectrometry-based proteomics with fluorescent probe-based conformational analysis into a unified experimental platform. By combining these two approaches, the study can simultaneously obtain both abundance and conformational information from the same protein samples, creating a comprehensive view of protein behavior in cells
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 high-throughput, multiplexed analysis of protein conformational changes in complex biological samples, providing insights into protein function and disease mechanisms, and has potential applications in disease diagnosis and therapy.
Implementation Method 1
limited proteolysis of a complex mixture under a condition where the protein is in the conformational state to be detected
Implementation Method 2
advanced targeted mass spectrometry, specifically using selected reaction monitoring (SRM) or SWATH-MS
Data Source
AI summary
A Method for the detection of the conformational state of a protein contained in a complex mixture of further proteins and/or other biomolecules, is proposed as well as assays for such a method. The method comprises the following steps: (1) Limited proteolysis of the complex mixture under a condition where the protein is in the conformational state to be detected leading to a first fragment sample; (2) Denaturation of the first fragment sample to a denaturated first fragment sample; (3) Complete fragmentation of the denaturated first fragment sample in a digestion step to a completely fragmented sample; and (4) Analytical analysis of the completely fragmented sample for the determination of fragments characteristic of having been the result both the limited proteolysis of step 1 as well as of the complete fragmentation in the digestion step 3. for the determination of the conformational state.