Fc-Binding Unit Mediator for Site-Specific Antibody Conjugation

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Solution Overview

Problem

Existing methods for conjugating materials to antibodies lack site-specific control, leading to drug structure inhomogeneity and impaired antibody function, which hinders the development of antibody-drug conjugate technology due to safety and reproducibility issues.

Innovation Solution

A compound comprising an Fc binding unit is used to transfer a material of interest to antibodies in a site-specific manner, enabling the formation of an antibody-payload conjugate with improved plasma stability through a branched linker.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If random conjugation methods are used to attach target moieties to antibodies, then the conjugation process is simple, but the drug structure becomes inhomogeneous and antibody function is impaired

Engineering Contradiction:

Improveconjugation process simplicityVSAvoiddrug structure homogeneity

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The patent introduces a Fc-binding unit as an intermediary component that mediates the attachment of target moieties to the antibody. This Fc-binding unit specifically binds to the Fc region of the antibody, serving as a controlled intermediate step that enables precise spatial positioning before the actual target moiety attachment, thereby resolving the contradiction between simple process and homogeneous structure

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent applies local quality by directing the conjugation process to a specific local region (the Fc region) of the antibody rather than random attachment throughout the entire antibody structure. This localized approach ensures that the antigen-binding domains remain unaffected while achieving homogeneous drug structure through controlled attachment at predetermined sites

Inventive Principle:

Principle #3Local quality

2Ease of manufacture

If random conjugation methods are used to attach target moieties to antibodies, then the conjugation process is straightforward, but the binding position cannot be precisely controlled

Engineering Contradiction:

Improveconjugation process straightforwardnessVSAvoidbinding position control

Core Design Contradiction:

Ease of manufactureVSMeasurement precision

Solution Approach 1:

The Fc-binding unit acts as a mediator that provides precise positioning information. It specifically recognizes and binds to the Fc region, serving as a molecular guide that directs the target moiety to the exact desired location on the antibody, thereby achieving precise binding position control without complicating the overall conjugation process

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent employs preliminary action by first attaching the Fc-binding unit to the target moiety before the actual conjugation to the antibody. This preliminary step pre-positions the target moiety with the correct spatial orientation and location information, ensuring that when conjugation occurs, the binding position is precisely controlled from the outset

Inventive Principle:

Principle #10Preliminary action

3Ease of manufacture

If target moieties are attached without site-specific control, then the conjugation method is simple, but the antibody's antigen recognition function is inhibited

Engineering Contradiction:

Improveconjugation method simplicityVSAvoidantibody function maintenance

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent applies local quality by restricting the conjugation reaction to occur only in the Fc region of the antibody, leaving the Fab regions (which contain the antigen-binding domains) completely unaffected. This spatial differentiation ensures that the antibody's antigen recognition function is preserved while still achieving the desired conjugation

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The Fc-binding unit serves as a protective intermediary that guides the conjugation process away from the antigen-binding domains. By mediating the attachment through Fc-region-specific binding, it prevents the target moiety from interfering with the Fab regions, thereby maintaining antibody functionality while keeping the conjugation process simple

Inventive Principle:

Principle #24Intermediary (Mediator)

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 enhances reaction efficiency and plasma stability of antibody-payload conjugates, ensuring structural homogeneity and maintaining antibody functionality.

Implementation Method 1

a compound comprising Fc binding unit provided according to some embodiments of the present application enables a material of interest (for example, a reactive group) to be transferred to a desired site of an antibody

Methodology Applied

Scientific EffectMolecular recognition and binding:

Data Source

PatentEP4613292A1Compound comprising fc-binding unit, and conjugate prepared using same

Publication Date: 2025.09.10 ABTIS CO LTD

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AI summary

Some embodiments of the present application provide a compound comprising Fc binding unit. The compound comprising Fc binding unit of the present application may be used to transfer a group of interest to an antibody in a position-specific manner. Furthermore, some embodiments of the present application provide a method for preparing an antibody conjugate comprising a group of interest (for example, a reactive group) using the compound comprising Fc binding unit.