Plant Sentinel Sensor Protein for Chemical Detection
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Solution Overview
Problem
Current detectors for biological and chemical agents are costly, require continuous maintenance, and are not suitable for widespread use due to their complexity and need for technically sophisticated operators and equipment.
Innovation Solution
A DNA construct is developed with a plant operable promoter linked to a nucleic acid sequence encoding a sensor protein that undergoes a conformational change upon binding to target substances, triggering a histidine kinase domain for nuclear shuttling and transcriptional activation, leading to chlorophyll degradation and a visible loss of green color in plants, allowing for simple and robust detection of agents like nerve gases, heavy metals, and pollutants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electronic and vacuum-like mechanisms are used to detect biological and chemical agents, then detection capability is achieved, but cost and continuous maintenance requirements increase significantly
Solution Approach 1:
The patent replaces complex electronic and vacuum-based detection mechanisms with a biological sensing system using plants. The sensor protein binds to target agents, triggering a signaling cascade that ultimately causes chlorophyll degradation and visible color change. This biological system eliminates the need for expensive electronic components, vacuum systems, and sophisticated operators while maintaining detection capability for various biological and chemical agents.
Solution Approach 2:
The patent utilizes chlorophyll degradation as a visible color change mechanism to indicate detection. When the sensor protein binds to target substances, the signaling pathway activates chlorophyll breakdown enzymes, causing the plant tissue to lose its green color. This visual output provides simple, direct detection without requiring complex electronic readouts or sophisticated operators.
2Reliability
If complex electronic detectors are deployed, then detection function is achieved, but the need for technically sophisticated operators and equipment increases
Solution Approach 1:
The patent replaces electronic detection systems requiring sophisticated operators with a biological sensing system. The plant-based detector uses natural biological processes (protein binding, signal transduction, chlorophyll degradation) to detect agents, producing visible color changes that can be observed without technical training. This eliminates the barrier to operation while maintaining detection functionality.
Solution Approach 2:
The plant-based detection system is self-indicating through visible color changes. The sensor protein automatically binds to target agents, triggers the signaling cascade, and produces a visible output without requiring external power, electronic readouts, or operator intervention. The system serves itself by converting molecular detection into visual signals that anyone can interpret.
3Ease of operation
If simple plant-based detection is used, then ease of operation and cost are improved, but detection speed and responsiveness may be reduced
Solution Approach 1:
The plant is pre-engineered with the sensor protein, signaling components, and chlorophyll degradation pathways in place. When target agents are introduced, the detection and response processes occur rapidly through pre-established molecular interactions. The sensor protein is already positioned to bind targets, and the signaling cascade is pre-assembled, enabling fast response without requiring setup time or operator training.
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 system enables fast, low-cost, and easy detection of biological and chemical agents through a visible change in plant color, facilitating widespread monitoring without the need for sophisticated equipment or operators, and allows for remote evaluation and rapid feedback.
Implementation Method 1
a sensor protein, said protein comprising a secretory sequence for directing the protein to the extracellular space of a plant cell and a binding region specific for a target substance of interest, wherein said protein undergoes a conformational change when the target substance is bound
Implementation Method 2
triggering a histidine kinase domain for nuclear shuttling and transcriptional activation
Implementation Method 3
leading to chlorophyll degradation and a visible loss of green color in plants
Data Source
AI summary
A eukaryotic input circuit: computationally designed receptors, synthetic eukaryotic signal transduction pathways, and a synthetic signal sensitive promoter that allow highly specific transcriptional induction in response to an externally provided ligand is disclosed. The input circuit is able to specifically bind a targeted substance and transmit a signal to the nucleus where transcription of a gene is activated. An output circuit serves as a simple readout system of the substance detected by the input circuit. The readout circuit exemplified here is a degreening circuit which causes plants to turn white. Activation of the degreening circuit can be detected by eye, or remotely with a variety of machines (hand-held, aircraft or satellite based) and is also resettable. When linked the input circuit if operably linked to the output circuit, produces a functional plant detector.