Peptide-Dye Fluorophore System for Cellular Imaging
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Solution Overview
Problem
Current molecular imaging techniques lack the specificity and sensitivity to effectively monitor the dynamics of multiple functional proteins or signaling pathways in living cells, particularly due to the limitations of large-sized fluorescent proteins and the lack of cellular specificity in small molecule-based fluorophores.
Innovation Solution
Development of a method involving peptides of 5 to 100 amino acids that specifically bind to organic dyes, changing their fluorescence properties, allowing for the detection and monitoring of proteins and biochemical processes through the use of expression constructs and one-bead-one-compound combinatorial peptide libraries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If green fluorescent protein and related fluorescent proteins are used for molecular imaging, then the distribution and dynamics of signaling molecules can be reported, but the large size (27 kDa) interferes with the evolved function of host proteins
Solution Approach 1:
The invention divides the fluorescent probe into two separate components: a small peptide tag (5-50 amino acids) and a small molecule fluorophore. This segmentation allows the peptide to be minimally invasive to host protein function while the fluorophore provides the detection capability, resolving the contradiction between detection precision and probe size.
Solution Approach 2:
The invention extracts the fluorescent functionality from the large GFP structure and transfers it to a small molecule fluorophore, leaving only a minimal peptide tag to be expressed with the host protein. This extraction eliminates the size interference problem while maintaining detection capability.
2Weight of stationary object
If small molecule based fluorophores are used for molecular imaging, then they can avoid the size limitation, but they lack cellular specificity for living cell imaging
Solution Approach 1:
The invention introduces a peptide tag as an intermediary that specifically recognizes and binds to a corresponding small molecule fluorophore within the cell. This peptide-fluorophore specific interaction provides cellular specificity, allowing the small molecule fluorophore to be selectively retained in cells expressing the target protein.
3Reliability
If site-specific chemical labeling systems are developed to detect proteins in living cells, then cellular specificity can be achieved, but existing systems lack the sensitivity and have limitations as biosensors
Solution Approach 1:
The invention optimizes the peptide-fluorophore binding parameters to achieve high affinity and specific binding, which enhances the signal-to-noise ratio. The specific design of the peptide sequence and its binding characteristics to the fluorophore creates a sensitive detection system with minimal background noise.
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 specific detection and monitoring of proteins and biochemical processes with enhanced sensitivity and specificity, allowing for multiplex imaging of protein dynamics and signaling pathways in living cells.
Implementation Method 1
contacting the peptide with a dye such that the peptide specifically binds to the dye changing the fluorescence properties of the dye
Data Source
AI summary
The present invention provides kits and methods for detecting peptides that change of the fluorescence of dyes upon binding to the dye. In addition, the invention provides methods for identifying said peptides.