Modular N-glycan Arrays on Aluminum Oxide for Binding Profiling
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Solution Overview
Problem
The complexity of glycan interactions and the lack of well-defined glycan libraries and analytical methods hinder the development of glycomics, particularly in understanding glycan-related biological and pathological processes, and in diagnostics and therapeutics for human diseases such as cancer and atherosclerosis.
Innovation Solution
A novel modular N-glycan synthetic approach is used to prepare diverse N-glycan arrays on aluminum oxide-coated substrates, enabling the synthesis of high mannose, hybrid, and complex-type N-glycans through chemical and enzymatic methods, which are then immobilized for binding profiling and screening of glycan-binding molecules like antibodies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If naturally occurring glycans are isolated, then glycan samples are obtained, but the purity is limited and the availability is limited
Solution Approach 1:
The glycan synthesis is divided into modular stages using protecting group strategies. Different protecting groups (e.g., acetone, benzylidene, silyl ethers) are applied to specific hydroxyl positions to enable stepwise assembly of glycan structures with high precision and purity.
Solution Approach 2:
Chemical synthesis intermediates with specific protecting groups serve as mediators to build up glycan structures systematically. These intermediates allow for controlled assembly and purification at each stage, achieving high purity while maintaining scalability.
2Adaptability or versatility
If various types of arrays are developed with different spacer groups and immobilization chemistry, then array diversity is increased, but the density, distribution and orientation of glycan presentation show differences that affect binding affinity
Solution Approach 1:
The patent applies specific immobilization chemistry (NHS-activated glass slide) and spacer group configurations at specific locations on the array to achieve uniform glycan presentation. This localized optimization ensures consistent density, distribution and orientation, making binding affinity measurements reliable across the array.
3Measurement precision
If glycan arrays are used for probing low affinity protein-glycan interactions, then sensitivity is improved, but the complexity of glycan interactions and lack of well-defined glycan libraries hinder detection
Solution Approach 1:
Well-defined glycan libraries are prepared in advance with precise structural characterization using chemical synthesis. These pre-characterized glycans are then assembled into arrays, eliminating the need for complex natural isolation procedures and enabling sensitive, reliable detection of protein-glycan interactions.
Data Source
AI summary
The present disclosure relates to novel modular methods for generating a diversity of N-glycans of high mannose, hybrid and complex types. The present disclosure also relates to exemplary arrays of the synthesized N-glycans spotted onto aluminium oxide coated slides. These arrays can be used to detect and analyze binding interactions between the synthesized N-glycans and glycan binding molecules, such as HIV-1 neutralizing antibodies. The present disclosure also relates to methods for identifying agents that bind to various types of molecules on the arrays and to defining the structural elements of the molecules on the arrays that bind to those agents. The arrays and methods provided herein may be used for general epitope identification, drug discovery and as analytical tools. The present disclosure also provides useful glycans and epitope determinants that are useful in detecting, diagnosing, recurrence monitoring and preventing pathological diseases such as HIV.