Protein A VH3 Purification for Monomeric Antibody Recovery
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Solution Overview
Problem
Existing methods for purifying antibodies and antibody-derived molecules without an Fc region are inadequate, leading to challenges in recovering them in monomeric form and removing higher molecular weight species such as dimers and trimers.
Innovation Solution
A method utilizing protein A chromatography with domains D and/or E to selectively bind and elute human VH3 domain-containing antibodies, allowing recovery in monomeric form, followed by additional chromatography steps to enhance purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional protein A affinity chromatography is used for antibody purification, then high purification factor is achieved, but antibodies without Fc regions cannot be effectively purified
Solution Approach 1:
The patent applies local quality by using specific Protein A domains (D and E) that have distinct binding properties. Domain D binds to the Fc region of antibodies, while domain E binds to the VH3 domain of antibody variable regions. This domain-specific approach enables the purification method to adapt to different antibody types (those with Fc regions and those without), resolving the contradiction between versatility and effectiveness.
2Adaptability or versatility
If Protein A domains D and E are used for binding, then both Fc region-containing and Fc region-lacking antibodies can be purified, but separation of monomeric forms from multimeric forms becomes challenging
Solution Approach 1:
The patent employs parameter changes by systematically varying pH during the chromatography process. At neutral pH, both monomeric and multimeric antibodies bind to Protein A domains D and E. During elution, a pH gradient is applied where multimeric forms elute at higher pH values while monomeric forms require lower pH for elution. This pH parameter manipulation enables effective separation of monomeric forms from multimeric forms while maintaining the ability to purify various antibody formats.
3Reliability
If alternative resins containing only domain B of Protein A are used, then VH3 binding is avoided, but purification of antibodies without Fc regions is not achieved
Solution Approach 1:
The patent applies universality by designing a Protein A-based chromatography system that performs multiple functions through different domains. Domain D provides Fc region binding for traditional antibody purification, while domain E provides VH3 domain binding for antibodies without Fc regions. This multi-functional approach allows a single resin to purify various antibody formats (IgG, Fab, F(ab')2, scFv, etc.), resolving the contradiction between elution profile control and purification method scope.
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 effectively enriches the eluate with monomeric antibodies, achieving at least 50-90% monomeric form recovery, while reducing multimeric forms, and can be applied to various antibody formats including Fab′, F(ab′)2, scFv, and Fab-Fv.
Implementation Method 1
A method utilizing protein A chromatography with domains D and/or E to selectively bind and elute human VH3 domain-containing antibodies
Data Source
AI summary
The present invention provides a method for recovering a human VH3 domain-containing antibody in monomeric form. In particular the present invention provides a new method that allows recovery of monomeric human VH3 domain-containing antibodies from a mixture containing monomeric and multimeric forms of the antibody.