DiGEP Phosphoprotein Imaging Reagent Specificity
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Solution Overview
Problem
Current phosphoproteomic analysis methods are time-consuming and costly due to the need for extensive fractionation and lack of specific and quantitative detection technologies for phosphoproteins in gel-based strategies, with existing commercial reagents being limited by low specificity and compatibility issues with mass spectrometric analyses.
Innovation Solution
A novel imaging reagent system, DiGEP, utilizing metal ions like Ti (IV), Zr (IV), Fe (III), and Ga (III) for specific binding to phosphoproteins, introducing fluorophores through covalent crosslinking, allowing differential visualization and quantitation of phosphoproteomes on a single gel, compatible with existing gel systems and imaging software.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If gel-based proteomic strategy is used for phosphoproteomics, then protein separation and visualization capability is improved, but detection specificity and quantitative accuracy deteriorate due to lack of specific detection technologies
Solution Approach 1:
The patent introduces metal ion chelating reagents as intermediary substances that specifically bind to phosphoproteins through metal ion-phosphate interactions. These reagents serve as mediators between the phosphoproteins and detection systems, enabling specific visualization and quantification. The metal ion chelating reagents contain fluorescent dyes that bind to metal ions, creating a detectable signal specifically at phosphoprotein locations.
Solution Approach 2:
The patent utilizes fluorescent dyes with different excitation and emission wavelengths to label phosphoproteins. By incorporating fluorophores that exhibit distinct color characteristics, the method enables differential visualization of phosphoproteins. The fluorescent signal intensity and color properties provide quantitative information about phosphoprotein abundance and distribution.
2Adaptability or versatility
If existing commercial reagents (Pro-Q Diamond, Phos-tag) are used for phosphoprotein staining, then versatility is improved, but binding specificity deteriorates due to low specificity of metal ion-phosphate interactions
Solution Approach 1:
The patent employs composite reagent systems that combine multiple functional components: metal ion chelating groups, fluorescent dye moieties, and linker structures. These composite molecules integrate multiple functions within a single reagent system, achieving both high versatility and high specificity. The multifunctional design allows simultaneous metal ion binding, fluorescent labeling, and stable attachment to phosphoproteins.
Solution Approach 2:
The patent designs reagents with localized functional groups positioned to interact specifically with phosphate groups on phosphoproteins. The metal ion chelating groups are positioned to form specific coordination complexes with phosphate moieties, while fluorescent dyes are positioned to emit signals only when bound to phosphoproteins. This localized functional arrangement ensures high binding specificity while maintaining versatility.
3Quantity of substance
If large-scale phosphoproteome experiments are conducted using shotgun sequencing, then comprehensive phosphoprotein identification is improved, but time consumption and cost increase due to extensive fractionation and data integration requirements
Solution Approach 1:
The patent extracts and isolates the specific function of phosphoprotein detection from the complex shotgun sequencing workflow. By using metal ion chelating reagents that specifically bind to phosphoproteins, the method extracts phosphoproteins directly from complex mixtures without requiring extensive fractionation. This extraction approach eliminates time-consuming separation steps while maintaining comprehensive detection capability.
Solution Approach 2:
The patent replaces mechanical separation methods (extensive fractionation, multiple chromatography steps) with chemical recognition methods (metal ion-phosphate specific binding). The chemical specificity of metal ion chelating reagents substitutes for complex mechanical separation systems, dramatically reducing processing time while maintaining comprehensive phosphoprotein detection. The chemical binding mechanism directly targets phosphoproteins without requiring physical separation of all proteins first.
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 high specificity and selectivity in detecting and quantifying phosphoproteins, reducing costs and time, facilitating large-scale phosphorylation analyses and identifying relevant phosphoproteins for further mass spectrometric analysis, with enhanced sensitivity and compatibility with existing technologies.
Implementation Method 1
utilizing metal ions like Ti (IV), Zr (IV), Fe (III), and Ga (III) for specific binding to phosphoproteins
Implementation Method 2
crosslinking the phosphoproteins via ultraviolet (UV) crosslinking
Implementation Method 3
introducing fluorophores through covalent crosslinking, allowing differential visualization and quantitation of phosphoproteomes
Data Source
AI summary
A novel imaging reagent and gel-based method for analyzing and comparing phosphoproteomes on the same gel are disclosed herein.