Multispecific Binding Compositions With Disulfide-Stabilized scFv
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing multispecific binding molecules lack stability and efficiency in binding to target antigens, particularly in immune response applications.
Innovation Solution
The introduction of disulfide bonds between structurally conserved surface-exposed cysteine residues in the VH and VL regions of single chain variable fragments (scFv) enhances the stability and expression yields of multispecific molecules, allowing for improved binding to tumor and T cell antigens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If disulfide bonds are introduced between VH and VL regions, then stability is improved, but device complexity increases
Solution Approach 1:
The patent merges the VH and VL regions through disulfide bond formation, creating a stabilized single-chain structure. The cysteine residues at specific positions (VH position 43 and VL position 100 in Kabat numbering) form inter-chain disulfide bonds that covalently link the variable regions, improving molecular stability while maintaining functional integrity
Solution Approach 2:
The patent introduces specific parameter changes by mutating amino acid residues to cysteine at predetermined positions. This chemical modification enables disulfide bond formation, fundamentally changing the structural parameters of the scFv molecule to achieve enhanced stability without requiring complete structural redesign
2Productivity
If disulfide bonds are introduced between VH and VL regions, then expression yields are improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality modification by introducing cysteine residues only at specific, strategically chosen positions within the VH and VL frameworks. Rather than modifying the entire structure, the invention focuses on localized cysteine placement at positions 43 and 100 (Kabat numbering), which are optimized to form stabilizing disulfide bonds while minimizing impact on overall expression and binding functionality
3Reliability
If multiple disulfide bonds are introduced, then binding capability is improved, but structural complexity increases
Solution Approach 1:
The patent implements partial action by introducing a limited number of disulfide bonds (typically one or two per scFv molecule) rather than extensive cross-linking. This selective approach provides sufficient stability and binding enhancement without creating excessive structural complexity that would hinder molecular flexibility and function
Solution Approach 2:
The patent segments the disulfide bonding strategy into distinct, independent bonds between specific cysteine pairs. Rather than creating a complex interconnected network, the invention establishes discrete disulfide links that can form independently, simplifying the overall structural organization while maintaining enhanced binding reliability
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 modified scFv molecules exhibit enhanced stability and binding capabilities, leading to improved immune response efficacy by targeting specific antigens effectively.
Implementation Method 1
a disulfide bond between a structurally conserved surface exposed VH position that is mutated to cysteine (Cys) and a L Cys
Data Source
AI summary
Disclosed herein, in certain aspects, are materials and methods for molecules comprising improved single chain variable fragments.