Solid-Phase Glycan Remodeling for Antibody Homogeneity
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Solution Overview
Problem
Current methods for controlling protein glycosylation profiles are limited by the scarcity of tools to access diverse glycan structures and the difficulty in producing high yields of desired glycoforms, with existing approaches often resulting in micro-heterogeneity and lack of control over molecular structure.
Innovation Solution
A solid-phase glycan remodeling (SPGR) system that immobilizes glycoproteins on resins, allowing for efficient enzymatic reactions with glycosylation enzymes, enabling the harmonization of antibody glycans into specific glycoforms, including non-canonical structures, with an average conversion ratio greater than 95% in 48 hours.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional synthetic approaches are used to prepare glycans, then structurally-defined glycans can be accessed, but the preparation becomes increasingly difficult as the number of saccharide units increases
Solution Approach 1:
The glycan remodeling process is divided into multiple enzymatic steps, each targeting specific glycan structures. Different glycosylation enzymes are applied sequentially to transform glycoproteins through intermediate stages, breaking down complex glycan modification into manageable segments that can be controlled individually
Solution Approach 2:
The patent utilizes different enzymatic conditions and parameters (such as enzyme type, substrate concentration, reaction time, and temperature) to control the glycan remodeling process. By adjusting these parameters, the system achieves high conversion ratios to specific glycoforms while maintaining feasibility of the process
2Quantity of substance
If genetic engineering is applied for controlled glycan biosynthesis, then in vivo glycan remodeling can be achieved, but the optimization is impeded by the complexity of engineering glycosylation pathways
Solution Approach 1:
The patent extracts and isolates specific glycosylation enzymes from complex cellular systems, allowing the remodeling process to be performed in vitro. This separation of the glycan remodeling function from the complex cellular environment enables controlled enzymatic reactions without the interference of other cellular processes
Solution Approach 2:
The patent introduces glycosylation enzymes as intermediary agents that mediate the transformation of glycoproteins. These enzymes act as catalysts that can be added in controlled amounts, allowing precise control over the glycan modification process without requiring complex genetic engineering of host cells
3Reliability
If in vivo glycan formation is used, then humanized glycoproteins can be produced, but micro-heterogeneity is generated which does not provide exquisite control over the molecular structure
Solution Approach 1:
The patent employs glycosylation enzymes that inherently possess high specificity for their substrate glycan structures. The enzymes self-regulate their catalytic activity to achieve uniform transformation, eliminating the need for external control mechanisms and ensuring consistent glycan modification across all substrate molecules
Solution Approach 2:
The patent replaces the complex cellular machinery of in vivo glycan synthesis with a simplified enzymatic system. This substitution of biological complexity with controlled enzymatic reactions enables precise control over glycan structure while maintaining the natural functionality of the modifications
4Adaptability or versatility
If successive reactions using different enzymes are used to construct complex glycan structures, then glycan diversity can be achieved, but buffer swapping and product purification processes must be repeated which is highly labor-intensive and time-consuming
Solution Approach 1:
The patent combines multiple glycosylation enzymes into a single reaction system that can process different substrate glycan structures simultaneously. This merging of enzymatic activities allows complex glycan remodeling to occur in one step, eliminating the need for separate buffer swapping and purification operations between reactions
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 SPGR system preserves the integrity and functionality of antibodies, achieving high biocompatibility and efficient glycoengineering, enabling the production of antibodies with predominantly desired glycoforms, thereby addressing the challenges of micro-heterogeneity and control over glycan structures.
Implementation Method 1
reacting the immobilized N-glycosylated glycoproteins with a glycosylation enzyme or sequentially with two or more glycosylation enzymes to produce immobilized N-glycosylated glycoproteins comprising remodeled N-glycans
Data Source
AI summary
A solid-phase glycan remodeling (SPGR) system for the glycoengineering of glycoproteins to provide glycoprotein compositions comprising particular predominant glycoforms is described.