Enzyme Cascade Protein Conformation Detection
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Solution Overview
Problem
Current analytical methods are insufficient for detecting and identifying proteins that differ primarily by their conformational structure, often lacking sensitivity and requiring expensive or complex equipment, especially when dealing with complex protein samples or minor conformational changes.
Innovation Solution
A method involving a cascade of enzymatic modifications, known as the enzyme cascade treatment, which amplifies small differences between proteins by sequential enzymatic steps, allowing for supersensitive detection and identification of proteins with identical or similar amino acid sequences but different conformations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mass spectrometry is used for protein identification, then protein identity can be confirmed, but conformational information is hardly accessible
Solution Approach 1:
The patent introduces conformation-sensitive enzymes as intermediary agents that translate conformational differences into detectable biochemical signals. These enzymes specifically recognize and bind to proteins in particular conformational states, serving as mediators that convert structural information into measurable enzymatic activity patterns, thereby recovering conformational information that would otherwise be lost in mass spectrometry analysis
Solution Approach 2:
The patent replaces the mechanical/physical mass spectrometry approach with a biochemical enzymatic system. Instead of using mass-to-charge ratio measurements, the invention employs conformation-sensitive enzymes whose catalytic activity serves as a proxy for detecting conformational states, substituting physical measurement with biological recognition and catalysis
2Loss of information
If spectroscopic techniques are used to obtain conformational information, then conformational data can be obtained, but resolution is relatively low
Solution Approach 1:
The patent changes the detection parameter from bulk spectroscopic properties to enzyme-specific catalytic activity. By measuring whether conformation-sensitive enzymes can bind and catalyze reactions on target proteins, the method transforms low-resolution spectroscopic data into high-resolution functional readouts that reflect specific conformational states through enzyme activity patterns
3Measurement precision
If X-ray diffraction is used for high resolution structure determination, then atomic information can be obtained, but crystallization is challenging and excludes important conformations
Solution Approach 1:
The patent employs conformation-sensitive enzymes that autonomously recognize and bind to proteins in solution without requiring crystallization. The enzymes self-select for specific conformational states through their natural binding specificity, automatically distinguishing between different protein conformers in complex mixtures without人工 intervention or sample preparation that might exclude important states
Solution Approach 2:
Instead of forcing proteins into crystalline order to obtain structural information, the patent inverts the approach by using soluble enzymes to probe conformational states in native solution conditions. The detection strategy is inverted from trying to crystallize the target protein to using crystallization-ready enzymes as probes against the target in solution
4Adaptability or versatility
If limited proteolysis is used to probe conformation, then conformational sampling can be achieved, but sensitivity for low-abundance proteins is insufficient
Solution Approach 1:
The patent extracts and amplifies the specific conformational recognition event by isolating the binding of conformation-sensitive enzymes to their target proteins. By focusing detection on the specific enzymatic recognition and catalytic activity rather than bulk proteolysis patterns, the method extracts the relevant conformational signal and amplifies it through enzymatic turnover, achieving high sensitivity for low-abundance proteins
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
The enzyme cascade treatment enhances and amplifies conformational differences between proteins, enabling their sensitive detection and identification without the need for large or expensive equipment, even in complex samples, and allows for qualitative and quantitative analysis of protein states.
Implementation Method 1
a method for detecting a protein in a protein sample by amplifying and enhancing small differences between proteins contained in the protein sample. In particular, the present invention uses a cascade of enzymatic modification steps
Data Source
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AI summary
The present invention deals with a method for detecting a protein in a protein sample by amplifying and enhancing small differences between proteins contained in the protein sample. In particular, the present invention uses a cascade of enzymatic modification steps to detect and identify a protein in a protein sample by enhancing small differences between the protein and other proteins contained in the protein sample. Further, the present invention provides a method for distinguishing two proteins having substantially identical or similar amino acid sequences but different protein conformations.