SpyCatcher Peptide Carrier for Protein Immobilization
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Solution Overview
Problem
Existing protein immobilization methods using epoxy carriers are sensitive to the types of proteins and carriers, requiring extensive optimization and screening to achieve higher recovery rates of activity, and often result in low recovery rates and inefficient immobilization processes.
Innovation Solution
A method utilizing a SpyCatcher peptide to form an isopeptide bond with a SpyTag peptide, allowing for specific and efficient immobilization of proteins on carriers, such as epoxy resin, without the need for additional enzyme catalysts or complex surface chemistry, under mild conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If epoxy carriers are used for protein immobilization, then mechanical stability is improved, but recovery rate of activity deteriorates
Solution Approach 1:
The patent introduces an intermediary functional layer between the epoxy carrier and the protein. This layer includes hydroxyl groups that can form hydrogen bonds with the protein, acting as a mediator that protects the protein's active site while allowing the epoxy carrier to provide mechanical stability. The intermediary layer prevents direct interaction between the epoxy groups and the protein's nucleophilic groups, thereby preserving protein activity.
Solution Approach 2:
The patent applies different functional groups at different locations on the carrier surface. The epoxy groups are localized in specific regions to provide anchoring points, while hydroxyl groups are distributed to interact with the protein and maintain its activity. This local differentiation allows the carrier to simultaneously provide mechanical stability and preserve protein function.
2Productivity
If multiple functional groups are added to epoxy carriers to improve immobilization, then immobilization efficiency may improve, but device complexity increases
Solution Approach 1:
The patent makes the hydroxyl group serve multiple functions: it acts as a hydrogen bond donor to interact with the protein, serves as a structural component of the functional layer, and provides a simple modification approach that can be applied to various epoxy carriers. This multi-functionality reduces the need for multiple different functional groups, thereby simplifying the overall system.
3Reliability
If extensive carrier screening and optimization is performed, then recovery rate of activity improves, but loss of time increases
Solution Approach 1:
The patent performs preliminary action by pre-modifying the epoxy carrier with hydroxyl groups before protein immobilization. This pre-modification creates a standardized functional carrier that can be used directly for various proteins without requiring subsequent optimization for each specific protein, thereby saving time while maintaining high recovery rates of activity.
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 enables high immobilization efficiency and recovery rates of protein activity, reducing the need for extensive carrier screening and optimizing the immobilization process, resulting in more homogeneous and active immobilized proteins.
Implementation Method 1
the SpyCatcher peptide linked to the carrier is capable of forming an isopeptide bond with a SpyTag peptide
Implementation Method 2
the SpyCatcher peptide is covalently attached to the carrier through the reaction of the amino group with the group
Data Source
AI summary
A SpyCatcher peptide-modified carrier, a protein immobilizing carrier, and a protein immobilizing method. The method comprises: linking a SpyCatcher peptide to a carrier so as to obtain a SpyCatcher peptide-modified carrier; and then based on a SpyCatcher-SpyTag reaction, immobilizing a target protein containing SpyTag to the SpyCatcher-modified carrier. A protein immobilization process in which the method is used is fast, a condition is mild, no extra chemical reagent is needed, the immobilization efficiency and an activity recovery rate are high, and the homogeneity is good.