Amide-Linked Mannose Attachment for Stable Mannosylated Dextrans
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Solution Overview
Problem
Current synthesis protocols for mannose moieties in mannosylated amine dextrans (MADs) face challenges due to the instability of amidine linkages, leading to product variability, reduced mannose retention, and increased production costs, which affect the scalability and shelf-life of MAD-based therapeutics and diagnostics.
Innovation Solution
Attaching mannose moieties to amine terminated leashes via an amide linkage, using a mannose-binding C-type lectin receptor targeting moiety with an anomeric thio-carboxylate moiety converted into an activated N-hydroxysuccinimide carboxylic acid ester, forming a stable amide linkage with the polymeric carbohydrate backbone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If amidine linkage is used to attach mannose moieties to amine terminated leashes, then the synthesis protocol is simple, but the linkage is unstable in aqueous solutions and at alkaline pH leading to hydrolysis and loss of mannose moieties
Solution Approach 1:
The patent changes the chemical parameters of the linkage from amidine to amide bond, which fundamentally alters the stability characteristics. The amide bond formed by reacting carboxylic acid derivatives with amines provides superior stability in aqueous and alkaline conditions compared to amidine linkages, while maintaining synthetic feasibility through standard coupling reagents like EDC or HATU.
Solution Approach 2:
The patent introduces carboxylic acid derivatives (such as esters or activated carboxylic acids) as intermediary compounds that facilitate the formation of stable amide linkages. These intermediaries react with the amine-terminated leashes to form the stable amide bond, serving as a bridge between the mannose moiety and the leash while ensuring linkage stability.
2Ease of manufacture
If amidine linkage is used for mannose attachment, then the synthesis process is straightforward, but continuous hydrolysis occurs during purification resulting in reduced mannose retention and increased production costs
Solution Approach 1:
The patent changes the chemical stability parameter of the linkage from unstable amidine to stable amide bond. This parameter change prevents hydrolysis during the purification process, ensuring that mannose moieties remain retained on the MAD construct throughout synthesis and purification steps, thereby improving reliability and reducing production costs.
3Productivity
If amidine linkage is used to attach mannose moieties, then the initial attachment is efficient, but repeated mannosylation reactions are required due to hydrolysis, increasing production time and cost
Solution Approach 1:
The patent changes the linkage stability parameter to prevent hydrolysis during storage and handling. This ensures that the mannose moieties remain attached through the entire production process without requiring repeated mannosylation reactions, thereby eliminating time loss and improving overall productivity.
4Ease of manufacture
If amidine linkage is used in MAD synthesis, then the protocol is established and simple, but product variability and reduced shelf-life occur due to linkage instability
Solution Approach 1:
The patent changes the chemical stability parameter of the linkage from amidine to amide bond. This parameter change ensures consistent product formation with reduced variability and extended shelf-life, while maintaining protocol simplicity through the use of standard coupling chemistry that can be implemented with existing manufacturing infrastructure.
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 amide linkage provides greater control and stability, ensuring reproducible mannose attachment, improving the scalability and shelf-life of MAD-based products.
Implementation Method 1
forming a stable amide linkage with the polymeric carbohydrate backbone
Implementation Method 2
Attaching mannose moieties to amine terminated leashes via an amide linkage
Data Source
AI summary
Provided are methods of attaching a mannose-binding C-type lectin receptor targeting moiety to a polymeric carbohydrate backbone using an amide linkage. The amide linkage may be found between a leash, such as an amine terminated leash, and the mannose-binding C-type lectin receptor targeting moieties. The compounds and compositions disclosed utilizing the amide linkage provide for highly stable compounds with a significant reduction in loss of mannose-binding C-type lectin receptor targeting moieties from the polymeric carbohydrate backbone.