In-Situ Membrane Protein Dimerization Imaging With SERS
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Solution Overview
Problem
Existing methods for detecting membrane protein dimerization states are limited to total protein amount detection and cannot achieve in situ observation of dimerization or subsequent cellular pathway activation.
Innovation Solution
An in situ detection kit using surface-enhanced Raman scattering (SERS) with catalytic hairpin self-assembly (CHA) triggered by DNA single chains with aptamer sequences, enabling networked assembly of recognition probes and SERS tags for high-sensitivity imaging of membrane protein dimerization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional protein analysis methods are used for detection, then the total amount of membrane protein can be detected, but the dimerization state cannot be observed in situ
Solution Approach 1:
The detection system is segmented into multiple functional modules: membrane-anchoring DNA chains for specific membrane protein binding, catalytic hairpin assemblies for signal amplification, and SERS tags for detection. Each module performs a specific function, allowing in situ dimerization detection while managing system complexity through functional decomposition
Solution Approach 2:
DNA aptamers serve as intermediary molecules that bridge membrane proteins and detection signals. The DNA chains with aptamer sequences specifically bind to membrane proteins and their complementary hybridization provides a readable signal, enabling indirect detection of dimerization states without directly observing the proteins themselves
2Reliability
If SERS detection with catalytic hairpin self-assembly is used, then high-sensitivity in situ imaging of membrane protein dimerization is achieved, but the device complexity increases
Solution Approach 1:
The nanoprobe system is pre-assembled with membrane-anchoring DNA chains, catalytic hairpin assemblies, and SERS tags before application. This preliminary configuration ensures that all components are in place and properly oriented, enabling immediate high-sensitivity detection upon contact with target membrane proteins without requiring complex real-time assembly procedures
Solution Approach 2:
The catalytic hairpin assemblies perform self-service through autonomous catalytic hairpin self-assembly (CHAS) reactions. The DNA structures automatically assemble and amplify signals in response to dimerization events without external intervention, providing self-powered signal amplification that enhances sensitivity while reducing the need for complex external control systems
3Ease of manufacture
If fluorescence-based methods are used for imaging, then cellular pathways can be visualized, but photobleaching and fluorescence complexity occur
Solution Approach 1:
The patent replaces fluorescence-based optical detection with SERS (surface-enhanced Raman scattering) detection. This substitution eliminates photobleaching issues inherent in fluorescence methods while providing comparable imaging capabilities. The SERS technique uses Raman scattering signals enhanced by metallic nanoparticles, providing photostable detection that does not suffer from the limitations of fluorescent dyes
Solution Approach 2:
The detection method transitions from fluorescence emission parameters to Raman scattering parameters. This parameter change fundamentally alters the detection physics, replacing the exponentially decaying fluorescence signal with the photostable Raman signal, thereby eliminating photobleaching while maintaining the ability to visualize cellular pathways and dimerization events
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 kit allows for high-specificity, sensitive detection and imaging of membrane protein dimerization, distinguishing different signaling processes in complex cellular environments, overcoming photobleaching and fluorescence complexity.
Implementation Method 1
Surface enhanced Raman scattering (SERS) has good photostability, and is known as a powerful tool for reliable, easy-to-operate, and ultra-sensitive trace substance analysis
Implementation Method 2
the hybridization sequences P1-c and P1-c′ are completely complementary to each other, and the hybridization sequence P1-c or P1-c′ has only 6-8 bases and preferably 7 bases
Implementation Method 3
Catalytic hairpin self-assembly (CHA) is triggered through proximity hybridization of DNA single chains with aptamer sequences during membrane protein dimerization
Implementation Method 4
the aptamer sequence P1-a can bind to the receptor protein monomer on the cell membrane
Implementation Method 5
the enhanced Raman scattering of the Raman molecules can be detected through the strongly coupled surface plasmon resonance of the nanogaps between the particles of the network nanostructure
Data Source
AI summary
An in-situ membrane protein dimerization state detection kit and the use thereof. The kit comprises a membrane protein anchor chain, a recognition probe and a SERS tag. Catalytic hairpin assembly is triggered by means of adjacent hybridization of the membrane protein anchor chain, which carries an adaptor sequence, during membrane protein dimerization to form a networked assembly of the recognition probe and the SERS tag, thereby performing SERS detection and imaging on a highly specific event in a cell communication process, namely the membrane protein dimerization. The kit is suitable for high-sensitivity monitoring of intercellular signaling based on membrane protein dimerization in a complex cell microenvironment.