Sugar-Guided Glycosylated Polypeptide Modification via Boronic Acid Probe
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Solution Overview
Problem
Conventional methods for modifying glycosylated polypeptides are non-specific, potentially damage the protein structure, or suffer from low sensitivity due to side reactions at high probe concentrations, making it difficult to selectively modify specific sites without affecting the protein's functional regions.
Innovation Solution
A method involving a probe molecule with a boronic acid group that forms an affinity covalent bond with the sugar group of the glycosylated polypeptide, allowing for controlled modification using a specific promoter, ensuring the binding and modification occur in individual steps, thereby selectively targeting the region adjacent to the sugar group without altering the protein structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the concentration of the probe molecule is increased to improve sensitivity, then the sensitivity is improved, but side reactions occur more frequently
Solution Approach 1:
The patent divides the modification process into two separate steps: first the probe molecule binds to the sugar group, then the modifying group is introduced. This segmentation allows the probe to be used at higher concentrations for better sensitivity without causing side reactions, as the modifying group is not present during the binding phase
Solution Approach 2:
The probe molecule performs preliminary binding to the sugar group before the modifying group is introduced. This preliminary action establishes the correct positioning and allows subsequent modification to occur selectively at the desired site without off-target effects
2Ease of manufacture
If conventional amine functional group modification is used to simplify the modification process, then the modification process is simplified, but the modification becomes non-specific and functional regions may be blocked
Solution Approach 1:
The probe molecule acts as an intermediary that specifically targets the sugar group and positions the modifying group at a precise location. This intermediary approach maintains process simplicity while achieving high specificity, as the probe guides the modification to the correct site without affecting functional regions
3Manufacturing precision
If thiol functional group modification is used to achieve specific binding, then the binding specificity is improved, but the protein structure is destroyed and bioactivities are lost
Solution Approach 1:
Instead of directly modifying the protein's thiol groups, the patent uses a probe molecule that copies the specific binding capability to the sugar group. This indirect approach achieves the desired specificity without damaging the protein's essential thiol groups and disulfide bonds, preserving bioactivity
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 allows for precise modification of glycosylated polypeptides, increasing sensitivity and flexibility in applications by preventing the blocking of functional regions and enabling the use of a wider probe concentration range, thus enhancing the effectiveness of the modification process.
Implementation Method 1
the sugar group of the target protein reacts with the boronic acid group of the probe molecule, so that the target protein binds to the probe molecule
Implementation Method 2
the nucleophilic functional group of the target protein performs a nucleophilic substitution reaction on the sulfonic ester group of the probe molecule under the proximate effect
Data Source
AI summary
The present invention provides a method of sugar-guided modifying a glycosylated polypeptide. First, a boronic acid group of a probe molecule and a sugar group of the glycosylated polypeptide form a first covalent bond. Next, an alkyne group of a modifying group and an azide group of the probe molecule form a second covalent bond by adding a promoter. As a result, the modifying group can be close to the glycosylated polypeptide. Then, the modifying group can bind to a nucleophilic residue that is near the sugar group, through a nucleophilic addition reaction. The method of the present invention can selectively modify a given site with the guidance of the sugar group.