Clickable Cross-Linker for Protein Interaction Analysis
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Solution Overview
Problem
Current clickable cross-linkers for investigating protein-protein and protein-nucleic acid interactions are bulky, less cell-permeable, and require time-consuming analysis to eliminate false positives, limiting their effectiveness in identifying specific binding partners and structural details.
Innovation Solution
Development of a clickable cross-linker compound with a small, cationic nature and bio-orthogonal conjugation capabilities, allowing for efficient cross-linking and enrichment of peptides, and utilizing a nucleophilic displacement reaction for fast screening of cross-linked peptides, along with a modifiable chain length for enhanced structural elucidation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional clickable cross-linkers are used for investigating protein-protein and protein-nucleic acid interactions, then cross-linking capability is achieved, but the cross-linkers are bulky and less cell-permeable
Solution Approach 1:
The patent changes the physical and chemical parameters of the cross-linker by introducing a cationic charge and reducing molecular bulk. The clickable cross-linker comprises a cationic head group, a linker region with bio-orthogonal functional groups, and reactive groups for cross-linking. The cationic charge improves cell permeability while the optimized linker length (1-20 carbons or 1-6 PEG groups) maintains cross-linking effectiveness without excessive bulk.
2Reliability
If traditional clickable cross-linkers are used, then cross-linking of proteins and nucleic acids is achieved, but time-consuming analysis is required to eliminate false positives
Solution Approach 1:
The patent employs mass spectrometry-based detection with distinctive mass signatures of the clickable cross-linker to rapidly identify and confirm true cross-linked products. The cross-linker contains bio-orthogonal functional groups (alkynes, azides, cyclooctynes) that enable specific labeling and detection, allowing fast screening and elimination of false positives through mass spectral analysis rather than time-consuming confirmatory experiments.
3Reliability
If existing cross-linkers are used for identifying binding partners, then interaction detection is possible, but detailed structural information relative to specific protein interfaces is not revealed
Solution Approach 1:
The patent replaces traditional mechanical separation methods (affinity chromatography, Western blot) with mass spectrometry-based analysis. The clickable cross-linker enables direct detection of cross-linked peptides by MS, providing precise mass-to-charge ratios that reveal detailed structural information about protein interfaces, binding partners, and interaction sites without requiring physical separation or antibody-based detection.
4Measurement precision
If functionalized chemical cross-linking reagents are used for selective and sensitive detection, then detection sensitivity is improved, but the cross-linker becomes very bulky and less cell-permeable
Solution Approach 1:
The patent segments the cross-linker into distinct functional modules: a compact cationic head group for cell permeability and initial binding, a modular linker region (1-20 carbons or 1-6 PEG groups) providing flexibility and bio-orthogonal functionality, and reactive groups for cross-linking. This segmentation allows each component to perform its function optimally without excessive overall size, maintaining both sensitivity and cell permeability.
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 solution enables selective and sensitive detection of cross-linked peptides, improving the identification of protein interactions and structural details, while being cell-permeable and facilitating rapid analysis, thus overcoming the limitations of existing cross-linkers.
Implementation Method 1
R is a reporter group selected from hexynyl groups, pentynyl groups, heptynyml groups, azido-propyl groups, azido-butyl groups, or azido-pentyl groups
Implementation Method 2
utilizing a nucleophilic displacement reaction for fast screening of cross-linked peptides
Data Source
AI summary
A clickable cross-linker compound provides an easily scanned reporter ion for effective and efficient cross-linking and identification of intermolecular and intramolecular interactions of proteins and peptides.