IMS-MS Isomer Differentiation for Peptide Analysis
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Solution Overview
Problem
Current analytical techniques are inadequate for identifying and characterizing isomers of biomolecules, particularly small peptides and proteins, due to limitations in differentiating between isomers with identical mass spectrometry fragmentation patterns and the inability to separate mixtures of multiple variants, which is crucial for understanding their biological functions and drug development.
Innovation Solution
The use of ion mobility spectrometry-mass spectrometry (IMS-MS) techniques, specifically trapped ion mobility spectrometry (TIMS) and traveling wave IMS (TWIMS), combined with metalation, allows for the high-resolution separation and identification of isomers such as lasso peptides and D-amino acid containing peptides by exploiting differences in ion mobility and conformational spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional mass spectrometry techniques are used to analyze isomers, then the analysis is simple and straightforward, but the techniques cannot differentiate between isomers with identical mass and fragmentation patterns
Solution Approach 1:
The patent combines ion mobility spectrometry (IMS) with mass spectrometry (MS) to create an IMS-MS hyphenated system. This merging allows the system to first separate isomers based on their ion mobility characteristics (drift time, mobility value) and then analyze their mass-to-charge ratio, providing two-dimensional separation capability that can differentiate isomers with identical mass but different conformations.
Solution Approach 2:
The patent introduces ion mobility as an additional separation dimension beyond traditional mass spectrometry. By measuring the drift time of ions through a buffer gas under an electric field, the system adds a temporal dimension to the analysis, enabling differentiation of isomers based on their size, shape, and conformational properties in addition to their mass.
2Manufacturing precision
If high-resolution separation of isomers is achieved using IMS-MS, then isomer identification accuracy improves, but the device complexity and operational sophistication required increases
Solution Approach 1:
The IMS-MS system performs self-separation of isomers based on their intrinsic physical properties (ion mobility, mass-to-charge ratio) without requiring complex sample preparation or external intervention. The hyphenated system automatically combines the separation and identification functions, reducing the need for manual intervention and simplifying operation despite the advanced technology.
3Measurement precision
If conventional techniques are used to separate mixtures of multiple isomer variants, then the process is simple, but the techniques cannot effectively separate and identify individual variants in complex mixtures
Solution Approach 1:
The ion mobility spectrometry component performs preliminary separation of isomers in the gas phase before they enter the mass spectrometer. This pre-separation step organizes the complex mixture into distinct ion mobility groups, allowing the subsequent MS analysis to efficiently identify and quantify individual variants without being overwhelmed by the complexity of the original mixture.
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 enables the effective separation and identification of isomers with high resolving power, allowing for the differentiation of lasso peptides from their branched-cyclic topoisomers and D-amino acid containing peptides from their L-amino acid analogs, even in complex mixtures, thereby enhancing the understanding of their biological functions and potential as drug candidates.
Implementation Method 1
ion mobility spectrometry-mass spectrometry (IMS-MS) techniques, specifically trapped ion mobility spectrometry (TIMS) and traveling wave IMS (TWIMS), combined with metalation, allows for the high-resolution separation and identification of isomers
Implementation Method 2
ion mobility spectrometry-mass spectrometry (IMS-MS) techniques
Implementation Method 3
The addition of metal ions often influences the fragmentation patterns upon activation. In addition, the potential of metal ions to differentiate isomer species, which present the same fragmentation pattern, has been shown using tandem mass spectrometry
Data Source
AI summary
The invention pertains to materials and methods for identifying and/or isolating isomers, particularly, of biomolecules, such as polypeptides and proteins. The methods of identifying and/or isolating isomers of a molecule according to the invention comprise subjecting a sample to ionization prior to IMS followed by MS. In some embodiments, the sample is subjected to metallization during the ionization step.