Endo180 Affinity Purification of Trimeric Fusion Proteins
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Solution Overview
Problem
Existing methods are inadequate for efficiently purifying trimeric fusion proteins containing a C-terminal polypeptide sequence of procollagen from complex samples, such as cell culture media, due to the need for reversible selection and isolation without disrupting the native trimeric structure.
Innovation Solution
Utilizing a soluble Endo180 polypeptide linked to a support, which forms a reversible complex with the C-terminal polypeptide sequence of procollagen, allowing for the purification of trimeric fusion proteins through specific binding and subsequent dissociation using salt buffers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional purification methods are used for trimeric fusion proteins, then the proteins can be isolated from complex samples, but the native trimeric structure may be disrupted and multiple steps are required
Solution Approach 1:
The patent introduces an Endo180 polypeptide as an intermediary binding agent that specifically recognizes and binds to the C-terminal polypeptide sequence of procollagen in the trimeric fusion protein. This mediator enables selective capture of the trimeric structure without disrupting its native conformation, while the immobilized Endo180 on solid support facilitates efficient purification in a single step
2Manufacturing precision
If multi-step purification protocols are employed, then high purity can be achieved, but the process time and complexity increase
Solution Approach 1:
The patent combines multiple purification functions into a single affinity chromatography step using immobilized Endo180 polypeptide. The Endo180 is covalently attached to solid support particles, creating a multifunctional purification medium that simultaneously provides specific binding, structural maintenance, and purification in one operation, eliminating the need for sequential purification steps
Solution Approach 2:
The immobilized Endo180 polypeptide serves multiple functions simultaneously: it acts as a specific binding agent for the C-terminal procollagen sequence, maintains the trimeric structure through gentle binding conditions, and provides a solid support for efficient separation. This multi-functional approach achieves high purity while reducing process time
3Measurement precision
If strong binding agents are used for purification, then selective isolation is improved, but reversible selection becomes difficult
Solution Approach 1:
The patent utilizes changes in ionic strength and pH parameters to control the binding equilibrium between Endo180 and the C-terminal procollagen sequence. Under physiological conditions, strong specific binding occurs for selective isolation. By increasing salt concentration or adjusting pH, the binding is reversed, enabling easy elution of the purified trimeric fusion protein without denaturation
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 method enables efficient and rapid purification of trimeric fusion proteins by forming a reversible complex with Endo180 polypeptides, effectively isolating and releasing the proteins in a single step, maintaining their native structure and purity.
Implementation Method 1
the soluble Endo180 polypeptide specifically binds to the C-terminal polypeptide sequence and/or trimer thereof, whereby the trimeric fusion protein and the soluble Endo180 polypeptide form a complex on the support
Implementation Method 2
the Endo180 ecto-domain polypeptide can be adsorbed, bound, attached, or otherwise immobilized to a support (e.g., a stationary phase in chromatography), whereby the trimeric fusion protein and the Endo180 ecto-domain polypeptide form a complex on the support
Implementation Method 3
allowing for the purification of trimeric fusion proteins through specific binding and subsequent dissociation using salt buffers
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~5B
AI summary
The present disclosure provides methods and compositions for affinity purification of proteins containing a C-terminal polypeptide sequence of a procollagen, such as trimeric fusion proteins. Also provided are polypeptides, fusion proteins, and recombinant polypeptides containing an Endo180 ecto-domain or portion thereof capable of reversibly binding a C-terminal polypeptide sequence of a procollagen. Also provided are articles of manufacture, kits, and apparatus related to the Endo180 ecto-domain polypeptides.