Single Fluorescent Protein cAMP Sensor for Robust Live Cell Detection
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Solution Overview
Problem
Existing genetically encoded fluorescent biosensors for detecting cAMP have not produced robust and reproducible signals suitable for live cell assays on standard automated fluorescence plate readers, limiting their effectiveness in monitoring cAMP levels, which is crucial for understanding drug targets and G-protein coupled receptors.
Innovation Solution
A novel cAMP sensor protein design featuring a single, circularly permuted fluorescent protein inserted into the hinge region of Epac, where the binding of cAMP alters fluorescence levels, providing a robust and reproducible signal that can be detected using standard equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional FRET-based fluorescent biosensors are used to detect cAMP, then the sensors can detect cAMP changes through fluorescence energy transfer, but the signals are not robust or reproducible enough for live cell assays on standard automated fluorescence plate readers
Solution Approach 1:
The patent replaces the FRET mechanism (which requires two fluorescent proteins and complex energy transfer) with a single fluorescent protein whose fluorescence intensity directly changes in response to cAMP binding. This substitution of the detection mechanism eliminates the weaknesses of FRET-based sensors while maintaining cAMP detection capability, achieving robust and reproducible signals suitable for automated plate readers
Solution Approach 2:
The patent utilizes conformational changes in the A-kinase anchoring protein (AKAP) upon cAMP binding to modulate the fluorescence intensity of the attached fluorescent protein. This parameter change approach - where the biological conformational change is directly coupled to fluorescence intensity rather than FRET efficiency - produces the required robust and reproducible signals for automated detection
2Adaptability or versatility
If FRET-based sensors with multiple fluorescent proteins are used, then cAMP detection is possible, but the device complexity increases and compatibility with standard automated fluorescence plate readers is reduced
Solution Approach 1:
The patent extracts and eliminates the unnecessary complexity of using multiple fluorescent proteins (donor and acceptor pairs) by employing a single fluorescent protein that directly reports cAMP levels through intensity changes. This extraction of the essential detection function while removing extraneous components enables compatibility with standard automated fluorescence plate readers
Solution Approach 2:
The single fluorescent protein sensor design serves multiple functions: it detects cAMP levels, provides robust signals for automated reading, and maintains compatibility with standard equipment. This universal design approach replaces the specialized FRET-based system with a more versatile sensor that works across different detection platforms
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
The novel cAMP sensor proteins offer robust fluorescence signals that can be used in live cell assays on standard plate readers, enabling effective detection of cAMP levels and multiplexing with other sensors to monitor G-protein pathways.
Implementation Method 1
changes in the level of fluorescence from the fluorescent protein
Data Source
AI summary
Described herein are novel fluorescent sensors for cyclic adenosine monophosphate (cAMP) that are based on single fluorescent proteins. These sensors use less visible spectrum than FRET-based sensors, produce robust changes in fluorescence, and can be combined with one another, or with other sensors, in a multiplex assay on standard fluorescent plate readers or live cell imaging systems.