Fluorescent Fusion Polypeptide for Second Messenger Detection
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Solution Overview
Problem
Current high-content screening methods for measuring second messenger concentrations in living cells are limited by the need for complex detection equipment and low sensitivity due to the use of FRET-based biosensors, which require multiple filters and complex signal analysis, and do not allow for precise localization with minimal disturbance to cell physiology.
Innovation Solution
A fluorescent fusion polypeptide is designed that changes localization within the cell from the cytoplasmic membrane to retention vesicles in response to increased second messenger concentrations, comprising a membrane localization peptide, a second messenger transduction protein binding peptide, and a reticulum retention signal, allowing for monitoring of second messenger concentrations through fluorescence redistribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If FRET-based biosensors are used for measuring second messenger concentrations, then signal detection capability is provided, but device complexity increases due to requirement of multiple filters and complex signal analysis
Solution Approach 1:
The patent extracts the detection function from complex FRET-based systems to a simpler fluorescent peptide system. The fluorescent peptide directly binds to second messengers and produces detectable fluorescence signals without requiring FRET mechanisms, multiple filters, or complex signal analysis, thereby eliminating unnecessary detection equipment complexity while preserving signal detection capability
Solution Approach 2:
The patent replaces the optical mechanism of FRET (fluorescence resonance energy transfer requiring multiple filters) with a direct fluorescence emission mechanism. The fluorescent peptide emits fluorescence directly upon binding second messengers, substituting the complex FRET optical system with a simpler direct fluorescence detection system that requires minimal filtering equipment
2Difficulty of detecting and measuring
If FRET-based biosensors are used for measuring second messenger concentrations, then signal detection is enabled, but measurement precision decreases due to low sensitivity
Solution Approach 1:
The patent changes the detection parameter from FRET efficiency (which requires precise distance control and produces weak signals) to direct fluorescence intensity. The fluorescent peptide exhibits strong fluorescence emission upon second messenger binding, significantly improving measurement sensitivity and precision while maintaining signal detection capability
Solution Approach 2:
The patent creates a composite fluorescent peptide structure combining a fluorescent moiety with a second messenger binding domain. This composite structure enables direct fluorescence detection with high sensitivity, overcoming the limitations of FRET-based biosensors by integrating detection and binding functions into a single optimized molecule
3Productivity
If traditional biosensor methods are used, then second messenger measurement is achieved, but cell physiology is disturbed due to invasive measurement requirements
Solution Approach 1:
The fluorescent peptide performs self-detection by directly binding to second messengers and emitting fluorescence signals within the cell. This self-service mechanism eliminates the need for invasive external detection systems, allowing data acquisition while minimizing disturbance to cell physiology
Solution Approach 2:
The fluorescent peptide acts as an intermediary between second messengers and detection equipment. It binds second messengers directly in their physiological context and converts their presence into detectable fluorescence signals, enabling non-invasive measurement that preserves cell physiology while maintaining data acquisition capability
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 sensitive measurement of second messenger concentrations with minimal disturbance to cell physiology, improving the accuracy and simplicity of data acquisition compared to traditional FRET-based methods.
Implementation Method 1
a fluorescent fusion polypeptide capable of changing its localization within the cell from the cell cytoplasmic membrane to the retention vesicles, upon an increase in the concentration of second messengers within the cell cytoplasm, comprising a membrane localization peptide, a second messenger transduction protein binding peptide, a reticulum retention signal and a fluorescent peptide
Data Source
AI summary
The present invention refers to a fluorescent fusion polypeptide capable of changing its localization within the cell from the cell cytoplasmic membrane to the retention vesicles, upon an increase in the concentration of second messengers within the cell cytoplasm, comprising a membrane localization peptide, a second messenger transduction protein binding peptide, a reticulum retention signal and a fluorescent peptide wherein: a. the membrane localization peptide is located at the N-terminus of the fluorescent fusion polypeptide and is physically bound, optionally through a linker, to the fluorescent peptide, which in turn is physically bound, optionally through a linker, to the second messenger transduction protein binding peptide; and b. the second messenger transduction protein binding peptide is physically bound, optionally through a linker, to the reticulum retention signal, which in turn is located at the C-terminus of the fluorescent fusion polypeptide.