Single-Molecule PTM Detection via Luminescence Signatures
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Solution Overview
Problem
Current methods for identifying post-translational modifications (PTMs) in proteins are limited to ensemble-based approaches, making it challenging to determine the precise location of PTMs within individual polypeptides.
Innovation Solution
A novel single-molecule measurement method that involves contacting a single polypeptide with PTM-specific affinity reagents and detecting luminescence signatures to identify and locate PTMs, allowing for precise determination of PTM locations and proteoform distributions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ensemble-based methods are used to identify PTMs, then the overall detection capability is maintained, but the precision of PTM location within individual polypeptides deteriorates
Solution Approach 1:
The patent segments the polypeptide into individual molecules for analysis, moving from ensemble-level measurement to single-molecule measurement. This allows precise identification of PTM locations within individual polypeptides by isolating and analyzing each molecule separately, thereby resolving the contradiction between measurement precision and methodology complexity.
Solution Approach 2:
The patent replaces traditional mechanical/chemical ensemble-based detection methods with optical detection methods. By using luminescence signatures and optical detection systems, the patent achieves precise PTM location at the single-molecule level without requiring complex mechanical separation or purification procedures, thus improving precision while managing complexity.
2Measurement precision
If single-molecule measurement methods are implemented, then PTM location precision is improved, but the complexity of the measurement system increases
Solution Approach 1:
The patent employs a universal detection system that can identify multiple types of PTMs and characterize various polypeptide features using the same fundamental platform. The system uses universal affinity reagents and luminescence detection mechanisms that work across different PTM types, reducing the need for multiple specialized systems and thereby managing complexity while maintaining high precision.
Solution Approach 2:
The patent utilizes changes in luminescence parameters (intensity, lifetime, spectrum) as detectable signals for PTM identification. By monitoring these optical parameter changes rather than requiring complex mechanical or chemical measurements, the system achieves single-molecule precision while keeping the detection mechanism relatively simple and manageable.
3Loss of information
If traditional PTM detection methods are used, then the overall protein analysis is simplified, but the ability to determine precise PTM locations within individual polypeptides is lost
Solution Approach 1:
The patent performs preliminary separation and isolation of individual polypeptide molecules before PTM detection. By pre-preparing single-molecule samples through techniques like size-exclusion chromatography or affinity-based isolation, the system enables precise PTM location determination while maintaining operational simplicity through automated sample preparation and analysis.
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
Enables the precise identification and localization of PTMs within individual polypeptides, providing detailed insights into protein function and structure at the single-molecule level.
Implementation Method 1
contacting a single polypeptide with one or more post-translational modification-specific (PTM-specific) affinity reagents; and identifying whether the single polypeptide comprises a post-translational modification (PTM) by determining a luminescence signature representative of the binding interaction(s)
Implementation Method 2
determining a luminescence signature representative of the binding interaction(s) between the single polypeptide and the one or more PTM-specific affinity reagents
Implementation Method 3
detecting a series of signal pulses indicative of association of the one or more terminal amino acid recognition molecules with successive amino acids exposed at a terminus of the single polypeptide while the single polypeptide is being degraded
Implementation Method 4
detecting a series of signal pulses indicative of association of the one or more terminal amino acid recognition molecules with successive amino acids exposed at a terminus of the single polypeptide while the single polypeptide is being degraded
Data Source
AI summary
The disclosure provides methods and compositions that enable the identification of polypeptides having one or more post-translational modifications. In some embodiments, the disclosure provides a method (e.g., a single-molecule measurement method) comprising contacting a single polypeptide with one or more post-translational modification-specific (PTM-specific) affinity reagents; and identifying whether the single polypeptide comprises a post-translational modification (PTM) by determining a luminescence signature representative of the binding interaction(s) between the single polypeptide and the one or more PTM-specific affinity reagents.