CORA Method for O-Glycan Amplification and Profiling
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Solution Overview
Problem
Current technologies for analyzing protein glycosylation, particularly mucin-type O-glycosylation, face challenges due to the complexity and diversity of glycans, low abundance of certain species, poor sensitivity, and inefficient release methods from biological samples, limiting their application in biological settings.
Innovation Solution
The development of a method called Cellular O-Glycome Reporter/Amplification (CORA) that uses peracetylated benzyl-α-N-acetylgalactosamine to amplify and profile mucin-type O-glycans in living cells, allowing for sensitive and unbiased analysis of O-glycans through conversion into secreted, purified, and analyzed oligosaccharides using HPLC and mass spectrometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If chemical strategies (alkaline beta-elimination) are used to release O-glycans from biological samples, then O-glycans can be released for analysis, but the process is inefficient, potentially biased, and may result in O-glycan degradation via peeling reaction
Solution Approach 1:
The patent introduces a chemical intermediary (alkoxyamine reagent) that mediates the release of O-glycans from glycoproteins through a two-step process: first forming a stable alkoxyamine adduct with the O-glycan, then releasing it under mild conditions. This intermediary approach avoids direct harsh chemical treatment, improving both release efficiency and O-glycan integrity.
Solution Approach 2:
The patent replaces the mechanical/chemical force-based alkaline beta-elimination method with a chemical bonding-based alkoxyamine approach. Instead of using strong base to forcibly cleave the glycosidic bond, the method uses selective chemical bonding followed by controlled release, substituting a harsh mechanical/chemical process with a more selective chemical pathway that preserves O-glycan structure.
2Measurement precision
If conventional glycomics approaches are used to analyze glycans, then structural analysis can be performed, but the sensitivity is poor and relatively large amounts of biological samples are required
Solution Approach 1:
The patent changes the chemical parameters of the O-glycan molecule by attaching an alkoxyamine tag, which alters its physical and chemical properties. This modification enables the O-glycans to be detected and analyzed with higher sensitivity using standard analytical techniques, effectively amplifying their detectability without requiring more biological material.
3Adaptability or versatility
If the diversity and complexity of glycans are considered, then comprehensive glycan analysis can be achieved, but the analysis becomes challenging and existing technologies fail to provide simple and sensitive methods
Solution Approach 1:
The patent segments the complex task of O-glycan analysis into distinct steps: (1) selective tagging of O-glycans with alkoxyamine reagents, (2) enrichment of tagged O-glycans, and (3) analysis using standard techniques. This segmentation simplifies the overall process by isolating the complex chemical biology step from the routine analytical steps, making the entire workflow more manageable while maintaining comprehensive coverage.
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
CORA achieves a significant increase in sensitivity, identifying a more complex repertoire of O-glycans, with a 100-1,000-fold improvement over conventional methods, enabling the analysis of low-abundance species and providing insights into the diversity of the human O-glycome, potentially identifying novel glycan biomarkers for diseases.
Implementation Method 1
mixing the acetylated tagged oxygen linked saccharide with a cell under conditions such that the acetylated tagged oxygen linked saccharide penetrates into the cell
Implementation Method 2
the saccharide is converted into oxygen linked oligosaccharides or multiple tagged oxygen linked oligosaccharides
Data Source
AI summary
This disclosure relates to libraries of oligosaccharides comprising multiple individual oligosaccharides derived from cells that contain a tag or detectable marker. In certain embodiments, the tag or detectable marker is an oxygen linked to the oligosaccharides through the first carbon of a sugar ring. In certain embodiments, the disclosure relates to methods of generating the libraries of oligosaccharides using saccharides, e.g., monosaccharides, or a disaccharide, in which hydroxyl groups are chemically acetylated.