MAO B-GFP Fusion Protein Shield Effect for Dopamine Detection

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Solution Overview

Problem

Current methods for detecting dopamine in vivo are invasive and lack specificity, as they rely on non-physiological conditions and cannot distinguish dopamine from other substances, such as vitamin C, which coexists with dopamine, leading to overlapping readings and inaccurate measurements.

Innovation Solution

The development of fusion proteins combining monoamine oxidase B (MAO B) with green fluorescent protein (GFP), utilizing the 'shield effect' to detect dopamine under physiological conditions by blocking GFP fluorescence when MAO B is in its oxidized state and allowing fluorescence when it binds to dopamine, enabling precise detection through changes in the protein's oxidation state.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If HPLC is used to measure dopamine, then measurement capability is achieved, but the method requires non-physiological conditions and cannot distinguish dopamine from other substances

Engineering Contradiction:

Improvedopamine detection accuracyVSAvoidphysiological condition compatibility

Core Design Contradiction:

Measurement precisionVSAdaptability or versatility

Solution Approach 1:

The patent combines MAO B enzyme with GFP fluorescent protein to create a fusion protein that integrates dopamine detection capability with fluorescent signal output, enabling specific dopamine detection under physiological conditions while maintaining measurement accuracy

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent utilizes fluorescent protein that changes emission intensity based on MAO B oxidation state, where the fluorescent signal varies from strong (oxidized state) to weak (reduced state after dopamine binding), providing a visual indicator for dopamine detection

Inventive Principle:

Principle #32Color changes

2Measurement precision

If carbon nanotubes are injected for dopamine detection, then oxidation-reduction potential measurement is achieved, but the method is invasive and only suitable for single point measurement

Engineering Contradiction:

Improvesubstance content conversion accuracyVSAvoidinvasiveness and measurement flexibility

Core Design Contradiction:

Measurement precisionVSEase of operation

Solution Approach 1:

The MAO B-GFP fusion protein performs self-detection by utilizing the enzyme's natural oxidation-reduction cycle, where dopamine binding reduces MAO B and decreases GFP fluorescence, eliminating the need for external carbon nanotube injection or complex measurement systems

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent replaces the mechanical injection system of carbon nanotubes with a biochemical system using MAO B enzyme activity, substituting physical invasion with enzymatic reaction-based detection that is non-invasive and suitable for continuous measurement

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Quantity of substance

If oxidation-reduction potential measurement is used, then substance content detection is achieved, but overlapping readings from multiple substances reduce measurement specificity

Engineering Contradiction:

Improvetested substance contentVSAvoidmeasurement specificity

Core Design Contradiction:

Quantity of substanceVSMeasurement precision

Solution Approach 1:

The patent confers substrate specificity to the detection system by using MAO B enzyme that selectively binds dopamine, ensuring that only dopamine molecules can trigger the oxidation-reduction response and subsequent fluorescent signal change, eliminating interference from other substances like vitamin C

Inventive Principle:

Principle #3Local quality

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 allows for non-invasive, specific detection of dopamine levels in cells and tissues, overcoming the limitations of existing methods by using the MAO B-GFP fusion proteins to emit fluorescence only when dopamine binds, thus providing accurate measurements under physiological conditions.

Implementation Method 1

utilizing the 'shield effect' to detect dopamine under physiological conditions by blocking GFP fluorescence when MAO B is in its oxidized state and allowing fluorescence when it binds to dopamine

Methodology Applied

Scientific EffectShield effect:

Implementation Method 2

green fluorescent protein (GFP), utilizing the 'shield effect' to detect dopamine under physiological conditions by blocking GFP fluorescence

Methodology Applied

Scientific EffectFluorescence: Fluorescence

Implementation Method 3

the oxidation-reduction potential of many substances in actual measurements produces overlapped readings; for instance, the oxidation-reduction potential of vitamin C overlaps with dopamine

Methodology Applied

Scientific EffectOxidation-reduction reaction: Redox Reactions

Data Source

PatentUS8426220B2Utilization of shield effect for dopamine detection and reagent development

Publication Date: 2013.04.23 NATIONAL TSING HUA UNIVERSITY

AI summary

The present invention relates to fusion proteins of monoamine oxidase B (MAO B)-green fluorescent protein (GFP) and utilizes “shield effect” to detect the dopamine under physiological condition, providing the reagent and method for dopamine detection.