Sialic Acid Lactone Modification for Bioorthogonal Labeling
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Solution Overview
Problem
Current bioorthogonal reaction schemes and reagents lack efficiency, specificity, and effective application in biological settings, particularly in glycan engineering and in vivo imaging.
Innovation Solution
Methods involving the selective modification of 2,3 linked sialic acid and 2,8 linked polysialic acid using condensing reagents like EDC and HOBt to form lactones, followed by reaction with bi-functional linkers such as propargyl amine or azido amine, enabling the attachment of reactive cargo molecules for enhanced modification and application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional bioorthogonal reaction schemes are used, then reactions can be performed in biological settings, but efficiency and specificity are insufficient
Solution Approach 1:
The patent modifies the chemical structure of sialic acid by introducing a unique lactone functional group at the 2-position through condensation with propargyl amine or azido amine. This structural parameter change creates a novel bioorthogonal handle that reacts specifically with corresponding reagents (tetrazines or phosphines), thereby improving both reaction efficiency and specificity in biological settings
Solution Approach 2:
The patent employs a bi-functional linker as an intermediary that first forms a lactone with the sialic acid 2-position carboxyl group, then provides a reactive handle (propargyl or azido group) for subsequent bioorthogonal coupling. This two-step intermediary approach enables selective modification without affecting other sialic acid linkages or biological molecules
2Manufacturing precision
If selective modification of sialic acid is achieved, then precision in glycan engineering is improved, but reaction conditions and procedures become more complex
Solution Approach 1:
The patent divides the modification process into distinct segments: (1) selective lactone formation at the 2-position using condensing reagents under controlled pH conditions, (2) attachment of bi-functional linkers with propargyl or azido groups, and (3) subsequent bioorthogonal coupling with cargo molecules. This segmentation enables precise control over which sialic acid positions are modified, improving selectivity while making the complex procedure more manageable through stepwise optimization
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
This approach improves the efficiency and specificity of bioorthogonal reactions, allowing for precise modification and functionalization of sialic acids, enhancing their utility in assays and cargo delivery in biological contexts.
Implementation Method 1
exposing a 2,3 linked sialic acid and/or a 2,8 linked polysialic acid to one or more condensing reagents (e.g. EDC, HOBt) under suitable reaction conditions to form a lactone at the 2,3 and/or 2,8 linkages
Implementation Method 2
exposing the lactone to a bi-functional linker with a primary amine the second functionality under suitable reaction conditions to selectively modify the linked sialic acid and/or polysialic acid with the second functionality
Implementation Method 3
exposing the selectively modified sialic acid and/or polysialic acid with a reactive cargo molecule whereby the reactive cargo molecule reacts with the second functionality on the modified sialic acid or polysialic acid to selectively attach a cargo molecule the linked sialic acid or polysialic acid
Data Source
AI summary
Described herein are compounds, compositions, and reagents capable of labeling a biomolecule. In some embodiments, the compounds, compositions, and reagents allow for labeling to occur using a bioorthagonal reaction outside of a living cell and without a glycosyltransferase enzyme. Also described herein are methods of using the compounds compositions and reagents described herein.