Silica-Binding Peptide Tags for Cost-Effective Protein Purification
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Solution Overview
Problem
Current affinity tags for protein purification require expensive specialized reagents and substrates, such as immobilized antibodies or nickel nitrilotriacetate resins, making rapid and inexpensive protein purification challenging.
Innovation Solution
Development of silica-binding peptides, specifically affinity tags like Car9, Car8, Car12, and Car36, which bind to inexpensive silicon oxide substrates like silica gel, enabling efficient and cost-effective protein purification using these substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional affinity tags (e.g., His-tag, GST-tag) are used for protein purification, then protein purification can be achieved, but expensive specialized reagents and substrates are required
Solution Approach 1:
The patent replaces expensive, specialized affinity tags and their corresponding costly purification reagents with a simple silica-binding peptide tag that uses inexpensive silica gel as the purification substrate. The silica gel can be easily disposed of after a single use, eliminating the need for expensive reusable resins and specialized buffers, thereby resolving the contradiction between low cost and reliable purification.
Solution Approach 2:
The patent creates a simplified version of traditional affinity tagging systems by using a small peptide sequence (silica-binding peptide) that mimics the function of larger, more complex affinity tags. This peptide copy can be easily synthesized and attached to target proteins, providing the same purification function but with dramatically reduced material costs and simplified procedures.
2Productivity
If rapid protein purification is achieved using traditional methods, then purification speed is improved, but specialized reagents increase the cost
Solution Approach 1:
The method enables rapid purification by simply passing protein samples through a silica gel column or mixing with silica gel beads, eliminating complex multi-step protocols required by traditional methods. The disposable nature of silica gel allows for quick setup and disposal, maintaining high productivity while reducing costs by removing the need for expensive, reusable specialized reagents.
3Ease of manufacture
If inexpensive substrates are used for affinity tagging, then cost is reduced, but binding specificity and purification quality may worsen
Solution Approach 1:
The patent achieves high purification quality with inexpensive silica gel by designing a localized silica-binding peptide sequence that concentrates the binding function at a specific site on the protein. This localized affinity tag ensures specific interaction with silica gel surfaces, preventing non-specific binding of impurities and maintaining high purification quality despite the simplicity and low cost of the silica gel substrate.
Solution Approach 2:
The silica-binding peptide serves as a functional copy of complex affinity tags, replicating the specific binding capability needed for high-quality purification. This peptide copy is specifically designed to recognize silica gel surfaces with high affinity and specificity, ensuring that the inexpensive substrate achieves purification quality comparable to or better than traditional expensive methods.
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 silica-binding peptides allow for rapid and inexpensive protein purification by adsorbing to silica substrates and can be released using arginine or lysine solutions, reducing the cost of protein purification significantly compared to traditional methods.
Implementation Method 1
The silica-binding peptide comprises the amino acid sequence DSARGFKKPGKR and binds to a silica substrate
Implementation Method 2
The fusion protein can be released from the silica substrate by contact with a solution comprising arginine and/or lysine
Data Source
AI summary
The present disclosure provides affinity tags, fusion proteins comprising one or more affinity tags, compositions comprising a fusion protein, methods of purifying a protein using an affinity tag, and devices for purifying a protein using an affinity tag.