Palladium-Mediated Fluorescent Probe for Selective CO Detection
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Solution Overview
Problem
Current methods for studying the effects of carbon monoxide (CO) in biological systems lack the ability to selectively track this transient small molecule within intact, living specimens, relying on gross anatomical changes or offline measurements, which do not provide detailed information about cellular signaling pathways.
Innovation Solution
Development of a CO-responsive small-molecule fluorescent probe, Carbon Monoxide Probe 1 (COP-1), utilizing palladium-mediated carbonylation chemistry to selectively detect CO in living cells, featuring a robust turn-on response and selectivity over reactive nitrogen, oxygen, and sulfur species.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If macroscopic and colorimetric measurement methods are used to detect CO effects, then the measurement can be performed with simple equipment and procedures, but detailed information about cellular signaling pathways cannot be obtained
Solution Approach 1:
The patent employs a fluorescent probe that undergoes a turn-on fluorescence response upon selective reaction with CO. The probe contains a fluorophore whose emission is quenched in the absence of CO and is restored when CO binds to the palladium center, producing a detectable fluorescent signal that provides detailed spatial and temporal information about CO signaling pathways in living cells
Solution Approach 2:
The patent uses a small molecule fluorescent probe as an intermediary to detect CO. The probe acts as a mediator between CO and the detection system, translating CO binding events into fluorescent signals that can be visualized and quantified, thereby enabling detailed investigation of cellular signaling pathways without requiring complex direct measurement equipment
2Loss of information
If offline extracellular measurements are used to track CO, then the measurement procedure is simplified, but spatial and temporal information within intact living specimens is lost
Solution Approach 1:
The patent employs a cell-permeable fluorescent probe that can be introduced into individual living cells. This segmentation approach allows CO detection to be performed at the single-cell level, preserving spatial and temporal information about CO signaling events within intact living specimens while maintaining detection reliability through the probe's selective chemistry
Solution Approach 2:
The patent replaces offline mechanical measurement systems with an optical detection system based on fluorescent probes. This substitution enables real-time, in situ visualization of CO dynamics within living cells, capturing spatial and temporal information that would be lost in offline measurements while maintaining reliability through the probe's selective reaction with CO
3Measurement precision
If a fluorescent probe with high selectivity for CO is developed, then detailed cellular signaling information can be obtained, but the probe design and synthesis becomes more complex
Solution Approach 1:
The patent achieves high CO detection selectivity by carefully selecting and optimizing the metal center (palladium) and its ligand environment. The specific coordination geometry and electronic properties of the Pd complex are tuned to favor selective binding of CO over other reactive species, while the synthesis follows established palladacycle chemistry protocols that balance selectivity with manufacturing feasibility
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 the visualization and quantitation of CO levels in various systems, providing spatial and temporal information on CO signaling pathways, enhancing the understanding of CO's biological roles and effects.
Implementation Method 1
the compounds of the invention make use of the well known palladium (Pd) mediated carbonylation chemistry as a way to functionalize a fluorescent scaffold with carbon monoxide
Implementation Method 2
CO-responsive small-molecule fluorescent probe... featuring a robust turn-on response
Data Source
AI summary
Carbon monoxide (CO) is a member of the gasotransmitter family that includes NO and H2S and is implicated in a variety of pathological and physiological conditions. Whereas exogenous therapeutic additions of CO to tissues and whole animals have been well studied, the real-time spatial and temporal tracking of CO at the cellular level remains an open challenge. We now report a new type of turn-on fluorescent probe for selective CO detection by exploiting palladium-mediated carbonylation reactivity. The compounds of the invention are capable of detecting CO both in aqueous buffer and in live cells with high selectivity over a range of biologically relevant reactive small molecules, providing a potentially powerful approach for interrogating its chemistry in biological systems.