Photocleavable Protein Anchors for Nanometer-Scale Spatial Proteomics
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Solution Overview
Problem
Existing protein detection technologies lack sensitivity, dynamic range, and fail to capture the spatial dimension of biological specimens, limiting the understanding of protein roles in cellular processes and disease dysfunction.
Innovation Solution
A method involving photocleavable linkers to anchor proteins in a swellable material, expanding the sample for selective photocleavage and extraction of untethered proteins, enabling high spatial resolution protein identification and sequencing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If laser microdissection is used to obtain spatial information, then spatial resolution is improved, but the resolution is limited to 50 μm and cannot achieve nanometer range resolution
Solution Approach 1:
The patent embeds proteins in a swellable material that expands in three dimensions, physically separating proteins that were previously at nanometer distances. This dimensional expansion transforms the measurement scale from micrometer (laser microdissection) to nanometer resolution by increasing the physical distance between adjacent proteins through isotropic expansion of the hydrogel matrix.
2Measurement precision
If immunohistochemistry is used to determine spatial distribution, then spatial information is obtained, but multiplexing potential is limited and predefined protein targets are required
Solution Approach 1:
The photocleavable linker system provides universal anchoring for any protein in the biological sample without requiring protein-specific antibodies or predefined targets. The expandable hydrogel matrix universally preserves spatial relationships for all proteins simultaneously, enabling unlimited multiplexing capability where any number of proteins can be analyzed from the same expanded sample.
Solution Approach 2:
The patent replaces the chemical-specific antibody-based detection system of immunohistochemistry with a universal physical expansion system. The hydrogel expansion mechanically separates all proteins based on their spatial positions, replacing the need for protein-specific chemical reagents with a universal physical separation mechanism that works for any protein.
3Measurement precision
If single-molecule protein sequencing is performed, then protein identification sensitivity is improved, but spatial information of the biological sample is lost
Solution Approach 1:
The patent performs preliminary anchoring of proteins to the hydrogel matrix before expansion, preserving their spatial coordinates. The photocleavable linkers are attached to proteins in situ, and the hydrogel is formed around them, capturing spatial information before any separation or analysis occurs. This preliminary anchoring ensures that when proteins are later released and sequenced, their original spatial positions are preserved in the expanded matrix.
Solution Approach 2:
The expandable hydrogel acts as an intermediary that simultaneously preserves spatial information and enables single-molecule sensitivity. The hydrogel matrix serves as a physical scaffold that maintains nanometer-scale spatial relationships while allowing individual proteins to be released and analyzed with high sensitivity sequencing methods, thus mediating between spatial preservation and detection sensitivity.
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
Achieves nanometer-scale spatial resolution and comprehensive protein analysis without predefined targets, overcoming limitations of existing methods like laser microdissection and immunohistochemistry.
Implementation Method 1
thereafter selectively photocleaving one or more of the linkers
Data Source
AI summary
The present disclosure provides photocleavable linkers capable of embedding proteins, of biological samples, within swellable materials, methods for extracting at least one protein from a biological sample, and methods for protein identification in biological samples.