Universal Reporter Peptide for Mass Spectrometry Quantitation
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Solution Overview
Problem
Current mass spectrometry methods for absolute quantitation of peptides, polypeptides, and proteins face challenges such as high costs and time-consuming amino acid analysis, variability in solubility and non-specific binding, and the need for frequent amino acid analysis of internal standards, which decreases precision and reproducibility.
Innovation Solution
The use of a heavy isotope labeled universal reporter peptide that is cleavably coupled to a reporter peptide, allowing for equimolar concentration and simplifying concentration calibration, reducing the need for amino acid analysis of each peptide and increasing analytical precision through multiplexing capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If amino acid analysis is performed on each internal standard peptide, then concentration calibration can be achieved, but time consumption and cost increase significantly
Solution Approach 1:
The patent introduces a universal reporter peptide that can be used across multiple analytes and experiments. This single universal reporter replaces the need for individual amino acid analysis of each internal standard peptide, as the universal reporter's concentration can be determined once and reused for quantifying multiple different peptides and proteins through isotopic dilution mass spectrometry.
Solution Approach 2:
The patent uses heavy isotope-labeled versions of the universal reporter peptide as internal standards. These heavy-labeled copies have identical chemical properties to the light universal reporter but can be distinguished by mass spectrometry, allowing the universal reporter to serve as its own internal standard without requiring separate amino acid analysis for each variant.
2Measurement precision
If multiple internal standard peptides are used for different analytes, then quantitation accuracy improves, but complexity of the method increases
Solution Approach 1:
The universal reporter peptide serves multiple functions: it acts as the internal standard, the reference for concentration calibration, and the basis for generating heavy-labeled internal standards for multiple different analytes. This single universal component replaces what would otherwise require multiple different internal standard peptides, each needing separate characterization.
Solution Approach 2:
The patent changes the isotopic composition parameter of the universal reporter peptide to create heavy-labeled versions for use as internal standards. By varying only the isotopic labeling while keeping the amino acid sequence identical, the method maintains chemical equivalence while enabling mass spectrometric distinction, thereby simplifying the overall approach compared to using structurally diverse internal standards.
3Measurement precision
If heavy isotope labeled internal standards are synthesized for each peptide, then quantitation precision improves, but manufacturing cost and complexity increase
Solution Approach 1:
Instead of synthesizing heavy isotope-labeled internal standards for each individual peptide analyte, the patent synthesizes heavy isotope-labeled versions of a single universal reporter peptide. This universal heavy-labeled standard can then be used across multiple analytes, dramatically reducing the number of synthesis reactions required while maintaining quantitation precision through isotopic dilution mass spectrometry.
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 precise and efficient absolute quantitation of multiple peptides and proteins with reduced analytical time and cost, improving reproducibility and precision by using a single universal reporter peptide for multiple analytes.
Implementation Method 1
Mass spectrometry (MS), in conjunction with internal standard peptides labeled or modified with stable heavy isotopes resulting in a heavy isotope labeled sequence
Implementation Method 2
a heavy isotope labeled analyte (internal standard) that is in equimolar concentration with, and that is cleavably coupled to, a reporter R
Data Source
AI summary
Quantitation of analytes, including but not limited to peptides, polypeptides, and proteins, in mass spectrometry using a labeled peptide coupled to a reporter, and a universal reporter.