Amide-Linked Mannose Attachment Via Amine Leashes on Carbohydrate Polymers
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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 synthesized 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 parameter of the linkage from amidine to amide bond. This parameter change fundamentally alters the stability characteristics, transforming the linkage from unstable in aqueous/alkaline conditions to stable under these conditions, while maintaining synthetic feasibility through standard amide coupling reagents like EDC or HATU
Solution Approach 2:
The patent introduces an activated ester intermediate (using reagents like EDC or HATU) as a mediator during the coupling reaction. This intermediary facilitates the formation of the stable amide bond between the mannose moiety and the amine-terminated leash, enabling the reaction to proceed under mild conditions while achieving the desired stable linkage
2Ease of manufacture
If amidine linkage is used for mannose attachment, then the synthesis process is straightforward, but continuous hydrolysis occurs during ultrafiltration purification resulting in reduced mannose retention and product variability
Solution Approach 1:
The patent changes the chemical stability parameter of the linkage from amidine to amide, which is resistant to hydrolysis under aqueous and alkaline conditions. This parameter change prevents the continuous degradation that occurs during ultrafiltration purification, thereby maintaining consistent mannose retention and improving manufacturing precision
Solution Approach 2:
The patent employs beforehand cushioning by selecting an amide linkage that is inherently resistant to hydrolysis before the purification process begins. This pre-established stability cushion protects against the continuous hydrolysis that would otherwise occur during ultrafiltration, ensuring consistent product composition without requiring repeated purification cycles
3Productivity
If amidine linkage is used to attach mannose moieties, then the initial synthesis is faster, but repeated mannosylation reactions are required due to hydrolysis, increasing production time and cost
Solution Approach 1:
The patent changes the linkage parameter from amidine to amide, which eliminates the need for repeated mannosylation reactions. The stable amide bond prevents hydrolysis during storage and handling, so the initial synthesis result is maintained without requiring time-consuming repeat reactions, thereby reducing overall production cycle duration
Solution Approach 2:
The patent applies beforehand cushioning by using an amide linkage that is pre-designed to be hydrolysis-resistant. This stability cushion eliminates the need for repeated synthesis cycles that would be required if an amidine linkage were used, as the amide bond maintains its integrity throughout storage and handling periods
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 over the number of mannose moieties attached, enhancing stability and reproducibility, thereby 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
converted into an activated N-hydroxysuccinimide carboxylic acid ester
Implementation Method 3
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.