Mass Spectrometry Substrates for Lysosomal Disease Detection
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Solution Overview
Problem
Current methods for detecting lysosomal storage diseases using tandem mass spectrometry are cumbersome and not readily adaptable to clinical settings due to harsh assay components and complex procedures, limiting their effectiveness in early detection and intervention.
Innovation Solution
Development of substrates with specific structural formulas and isotopically labeled internal standards for mass spectrometric analysis, allowing for the detection and quantification of lysosomal enzyme activities without the need for harsh solvents like chloroform, and enabling simultaneous detection of multiple enzymes in a single sample.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If harsh assay components such as chloroform are used in tandem mass spectrometry for detecting lysosomal storage diseases, then detection sensitivity is improved, but assay complexity and difficulty of clinical adaptation increase
Solution Approach 1:
The patent changes the chemical parameters of the assay system by replacing harsh solvents like chloroform with milder alternatives, and by modifying substrate structures to include specific functional groups that enable detection without requiring harsh conditions. This maintains detection sensitivity while reducing assay complexity
Solution Approach 2:
The patent introduces intermediary substances such as detergents and modified substrates that act as mediators between the enzyme reaction and mass spectrometry detection. These intermediaries enable sensitive detection while allowing the use of milder assay conditions that are more suitable for clinical settings
2Measurement precision
If complex procedures are used in tandem mass spectrometry for lysosomal enzyme detection, then measurement accuracy is improved, but ease of operation deteriorates
Solution Approach 1:
The patent incorporates preliminary actions by pre-modifying substrates with functional groups that facilitate direct detection, and by pre-establishing assay conditions that eliminate the need for complex sample preparation steps. This maintains measurement accuracy while simplifying operational procedures
Solution Approach 2:
The patent extracts and eliminates unnecessary complex steps from the assay procedure by using substrates and detection methods that provide direct, simple readouts. This removes cumbersome procedures while preserving the ability to achieve accurate measurements
3Productivity
If multiple enzymes are detected simultaneously in a single sample, then productivity is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing a single mass spectrometry-based assay system that can detect multiple lysosomal enzymes simultaneously. The modified substrates and detection methodology are universally applicable to various enzymes, enabling high-throughput screening without proportionally increasing assay complexity
Solution Approach 2:
The patent uses segmentation by employing multiple specific substrates, each targeted to a particular enzyme, within a single assay mixture. This allows parallel detection of multiple enzymes through distinct mass spectrometry signals, improving productivity while maintaining manageable complexity through modular substrate design
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 approach simplifies the detection process, enhances sensitivity, and reduces the complexity of assays, making it more practical for clinical use by eliminating the need for non-polar solvents and detergents, while allowing for the simultaneous analysis of multiple enzymes, thereby facilitating early detection of lysosomal storage diseases.
Implementation Method 1
Mass spectrometric analysis quantifies the mass-to-charge ratio between the cleaved product and the internal standard and thereby the enzymatic activity
Implementation Method 2
An internal standard is provided (B1—B2—B3)′ with the substrate of Formula I, where (B1—B2—B3)′ has at least one stable secondary prevalence isotope of molecular weight different than the cleavage product molecular weight
Data Source
AI summary
An inventive substrate is provided which includes a substrate compound of formula A—B1—B2—B3: wherein A is a sugar moiety; B1 is a linker moiety allowing the conjugation of moiety A and the remaining structure of the substrate; B2 contains a permanently charged element such as a quaternary ammonium group so as to increase proton affinities and ionization efficiencies for mass spectrometry detection efficiencies analysis; and B3 of various carbon length conferring specificities to targeted enzymes. Also provided is a process to detect lysosomal diseases by contacting a sample with the inventive substrate along with an internal standard which is isotope-labeled analog of the product cleaved by a targeted enzyme upon the substrate.