Thiol-Reactive Additive Boosts Antibody-Drug Conjugate Yield
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Solution Overview
Problem
The existing method of site-specifically transferring a drug or functional group to an antibody using a compound with a thioester group and an Fc-binding peptide results in a low yield of antibodies comprising a functional group.
Innovation Solution
A method is provided to increase the production yield of antibodies comprising a functional group by using a thiol-reactive additive. This involves contacting an antibody with a compound containing a thioester group, an Fc-binding peptide, and a functional group, and then capping the thiol group of the by-product formed with a thiol-reactive additive to remove the reaction inhibition effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a compound comprising a thioester group and an Fc-binding peptide is used to transfer a functional group site-specifically to an antibody, then the uniformity and recognition effect of the antibody are improved, but the production yield of the antibody comprising a functional group is low
Solution Approach 1:
The patent converts the harmful effect of the thiol-containing by-product (which inhibits the reaction) into a beneficial process by adding a thiol-reactive additive. The additive specifically reacts with the thiol group of the by-product to form a disulfide bond, eliminating the inhibition effect and actually promoting the overall reaction, thereby increasing production yield while maintaining site-specific labeling uniformity
Solution Approach 2:
The thiol-reactive additive acts as an intermediary substance that mediates between the thioester compound and the antibody. It reacts with the thiol-containing by-product to form a disulfide bond, effectively removing the by-product's inhibitory effect and enabling the main reaction to proceed more efficiently, thus resolving the contradiction between precision and productivity
2Ease of manufacture
If random labeling is used to attach foreign materials to antibodies, then the production process is simple, but the uniformity of the antibodies is reduced and recognition effect is significantly degraded
Solution Approach 1:
The patent applies local quality by directing the labeling reaction to a specific location on the antibody molecule. The Fc-binding peptide component of the compound specifically binds to the Fc domain of the antibody, ensuring that the functional group is attached only at this predetermined site rather than randomly throughout the molecule, thus achieving uniform labeling while maintaining ease of manufacture
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 use of a thiol-reactive additive significantly increases the yield of antibodies comprising a functional group, potentially by 1.5 times or more compared to methods without the additive, thereby improving the efficiency of the antibody production process.
Implementation Method 1
the thioester group of the compound for transferring a functional group reacts with a nucleophile of the antibody
Implementation Method 2
the thiol-reactive additive has reactivity with a thiol group, wherein the thiol-reactive additive reacts with the thiol group of the by-product
Data Source
AI summary
The present application relates to a method of increasing the production yield of an antibody comprising a functional group using a thiol-reactive additive.