SOX-Based Kinase Sensor Chelation-Enhanced Fluorescence
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for monitoring protein kinase activity are discontinuous and require specialized handling, with existing sensors often experiencing modest fluorescence changes, which can interfere with kinase recognition and reactivity.
Innovation Solution
Development of novel metal-binding compounds that exhibit chelation-enhanced fluorescence upon binding to Mg2+, integrated into peptidyl sensors with kinase recognition sequences, allowing for continuous, real-time detection of kinase activity through significant fluorescence increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional discontinuous assay methods are used, then kinase activity can be measured, but the measurement process is time-consuming and lacks continuous monitoring capability
Solution Approach 1:
The patent employs FRET-based sensors that enable continuous real-time monitoring of kinase activity through fluorescent resonance energy transfer. The sensor maintains constant interaction with the kinase substrate, allowing uninterrupted detection of phosphorylation events without requiring discrete sampling or endpoint measurements, thus transforming discontinuous assays into continuous monitoring processes.
Solution Approach 2:
The invention replaces traditional mechanical/discontinuous assay formats with optical detection methods. By using fluorescent probes and FRET mechanisms, the system substitutes physical separation and endpoint measurement with continuous optical signaling, enabling real-time detection of kinase activity through fluorescence intensity changes rather than repeated manual sampling.
2Illumination intensity
If fluorophores are placed adjacent to the phosphorylated residue, then fluorescence signal is enhanced, but kinase recognition and reactivity are interfered with
Solution Approach 1:
The patent applies FRET-based sensing where the fluorescent signal is generated through energy transfer between two chromophores (donor and acceptor) rather than requiring a single fluorophore directly at the phosphorylation site. This local quality approach allows the sensing function to be separated from the substrate interaction site, maintaining kinase recognition while enabling fluorescence detection through the FRET mechanism that occurs over a distance of a few nanometers.
Solution Approach 2:
The invention introduces FRET (fluorescence resonance energy transfer) as an intermediary mechanism between the kinase substrate and the fluorescent signal. Instead of placing fluorophores directly at the phosphorylated residue which would interfere with kinase binding, the system uses FRET as a mediator that transfers energy from the excited donor chromophore to the acceptor chromophore, generating a fluorescent signal that reports on the phosphorylation state without direct fluorophore interference with kinase recognition.
3Illumination intensity
If large fluorophores are used to enhance signal, then fluorescence intensity increases, but kinase substrate recognition is compromised
Solution Approach 1:
The patent replaces the mechanical approach of attaching large fluorophores directly to the substrate with an optical field-based approach using FRET. Instead of relying on the physical presence of bulky fluorophores that would sterically hinder kinase binding, the system uses fluorescent resonance energy transfer to generate signals from the electronic states of chromophores, eliminating the need for large molecular structures at the active site while maintaining sensitive detection.
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 continuous, real-time monitoring of kinase activity with enhanced fluorescence sensitivity, reducing interference and improving specificity, suitable for high-throughput screening and cellular localization studies.
Implementation Method 1
metal binding compounds of the formulae (I) to (XII) that exhibit chelation-enhanced fluorescence (CHEF) upon binding to Mg 2+
Implementation Method 2
metal binding compounds of the formulae (I) to (XII) that exhibit chelation-enhanced fluorescence (CHEF) upon binding to Mg 2+
Data Source
Figure 1
Figure 2A~2B
Figure 2C~2D
AI summary
Peptidyl sensors comprise a metal-binding peptide and one or two kinase recognition sequences with a hydroxyamino acid that can be phosphorylated in the presence of a kinase.