Bispecific Antibody Hinge Engineering for Selective Heterodimer Formation
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Solution Overview
Problem
Existing methods for producing bispecific antibodies face challenges in obtaining sufficient quantity and purity, with traditional techniques like hybrid-hybridoma technology being inefficient and difficult to purify, and alternative methods requiring complex engineering of multimerization domains.
Innovation Solution
Engineering heterodimeric proteins by modifying the hinge and CH3 regions of immunoglobulin-like polypeptides with charged amino acids to favor heterodimer formation over homodimer formation, and using electrostatic interactions and chromatography to purify the desired heterodimers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional methods are used to produce bispecific antibodies, then production can proceed with standard protocols, but yield and purity are insufficient and homodimer formation cannot be effectively prevented
Solution Approach 1:
The patent applies local quality by introducing specific charged amino acid modifications at defined positions within the hinge region (e.g., positions 221, 228, 368, 409) to create localized electrostatic interactions. These localized modifications selectively promote heterodimer formation without altering the overall antibody structure, thereby increasing both yield and purity of bispecific antibodies
Solution Approach 2:
The patent changes the chemical parameters of the hinge region by replacing specific amino acid residues with charged variants (e.g., introducing lysine, arginine, glutamate, or aspartate at specific positions). This parameter change creates favorable electrostatic interactions that specifically promote heterodimer formation, resolving the contradiction between yield and purity
2Adaptability or versatility
If standard antibody engineering methods are used, then bispecific antibodies can be produced, but heterodimer formation is not favored over homodimer formation
Solution Approach 1:
The patent introduces asymmetry by creating non-identical charged residues at corresponding positions in the hinge regions of different antibody chains. For example, one chain may have a positively charged residue at position 221 while the other has a negatively charged residue, creating asymmetric electrostatic attraction that specifically favors heterodimer formation over symmetric homodimer formation
Solution Approach 2:
The patent converts the naturally occurring electrostatic interactions in the hinge region, which normally do not provide sufficient selectivity, into a beneficial force for heterodimer formation. By introducing charged amino acid modifications, the patent enhances these natural interactions to specifically promote heterodimerization, turning a neutral or slightly unfavorable situation into a highly selective process
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
Enables efficient production and purification of heterodimeric proteins, such as bispecific antibodies, in high yields and stability, suitable for therapeutic and diagnostic applications.
Implementation Method 1
electrostatic interactions between one or more charged amino acids within the hinge interface favor interaction between the first and second hinge polypeptides over interaction between two first hinge polypeptides or two second hinge polypeptides
Data Source
AI summary
The present invention relates to engineered heteromultimeric proteins, and more specifically, to methods for producing and purifying heterodimeric proteins, such as bispecific antibodies and other heterodimeric proteins comprising immunoglubulin-like hinge sequences. Methods for producing and purifying such engineered heterodimeric proteins and their use in diagnostics and therapeutics are also provided.