Membrane Protein Identification on Extracellular Vesicles
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Solution Overview
Problem
Conventional methods for isolating and profiling membrane proteins from extracellular vesicles in plasma and serum are complex, time-intensive, and often result in impure protein samples, leading to inaccurate membrane protein characteristics and profiles.
Innovation Solution
A method involving density gradient preparation, size exclusion chromatography, and mass spectrometry to isolate and identify membrane proteins from extracellular vesicles, with optional steps like ultracentrifugation and enzyme treatment, to obtain pure and accurate protein profiles, specifically for breast cancer biomarker identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods are used to isolate and profile membrane proteins from extracellular vesicles, then the process can be completed, but the results are complex, time-intensive, and yield impure protein samples with inaccurate profiles
Solution Approach 1:
The patent segments the isolation process into distinct stages: density gradient centrifugation to separate EVs from lipoproteins, size exclusion chromatography for further purification, and selective lysis to release membrane proteins. Each segment addresses specific contamination issues, collectively achieving high purity while maintaining manageable procedural complexity through systematic division of the isolation task.
Solution Approach 2:
The patent introduces intermediate purification steps between initial isolation and final analysis. Density gradient media and size exclusion chromatography columns act as intermediaries that selectively retain or pass through EVs based on their physical properties, effectively removing contaminating lipoproteins and other plasma components before membrane protein extraction, thereby improving profile accuracy without requiring overly complex direct isolation methods.
2Reliability
If conventional isolation methods are used, then extracellular vesicles can be obtained, but the membrane proteins extracted are impure and characteristics are inaccurate
Solution Approach 1:
The patent performs preliminary separation of extracellular vesicles from plasma contaminants using density gradient centrifugation and size exclusion chromatography before membrane protein extraction. This preliminary purification action ensures that only pure EVs are processed in subsequent steps, guaranteeing reliable membrane protein purity while optimizing the overall time investment by preventing the need for repeated purification attempts.
Solution Approach 2:
The patent exploits changes in physical parameters (density, size, buoyancy) to selectively isolate EVs at different stages. By adjusting centrifugal force during density gradient separation and using size-based exclusion during chromatography, the method achieves high purity separation efficiently, improving reliability without excessive time loss through optimized parameter selection rather than prolonged processing.
3Productivity
If simple isolation methods are used, then the process is faster and simpler, but the membrane protein samples are not pure and profiles are inaccurate
Solution Approach 1:
The patent merges two complementary separation techniques—density gradient centrifugation and size exclusion chromatography—into a unified isolation workflow. This combination leverages the strengths of both methods: density gradient provides rapid initial separation, while size exclusion offers fine-tuned purification. The merged approach achieves both high productivity and accurate protein profiles by distributing the purification workload across multiple coordinated steps rather than relying on a single time-consuming method.
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 the effective isolation and profiling of membrane proteins, providing accurate and reliable biomarker signatures for breast cancer diagnosis by enhancing the purity and precision of membrane protein analysis.
Implementation Method 1
treating the isolated and purified extracellular vesicles with an aqueous solution to obtain membranes of the extracellular vesicles, wherein the aqueous solution has a pH in a range of 9 to 14
Implementation Method 2
adding salt in a concentration range between 0.5-2.0M to the aqueous solution; isolating the membranes from the treated extracellular vesicles
Implementation Method 3
identifying proteins on the isolated membranes by employing mass spectrometry
Data Source
AI summary
Disclosed is a method of isolating extracellular vesicles and identifying membrane proteins therefrom. The method includes providing human plasma and/or serum; separating lipoproteins and extracellular vesicles from the human plasma and/or serum by a density gradient preparation, collecting the extracellular vesicles from the separated lipoproteins and extracellular vesicles; isolating and purifying the collected extracellular vesicles by using size exclusion chromatography; treating the isolated and purified extracellular vesicles with an aqueous solution to obtain membranes of the extracellular vesicles, wherein the aqueous solution has a pH in a range of 9 to 14; adding salt in a concentration range between 0.5-2.0M to the aqueous solution; isolating the membranes from the treated extracellular vesicles and identifying proteins on the isolated membranes by employing mass spectrometry.