Bivalent Binding Agent for Specific Polypeptide Detection
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Solution Overview
Problem
Current methods for detecting posttranslationally modified polypeptides face challenges such as difficulty in obtaining antibodies with high specificity and affinity, cross-reactivity issues, and the need for reproducible and high-quality binding agents that can specifically target posttranslational modifications.
Innovation Solution
A bi-valent binding agent comprising two monovalent binders linked via a linker, where the first binder targets a polypeptide epitope and the second binder targets a posttranslational modification, with each monovalent binder having a dissociation rate constant (Kdiss) in the range of 5x10^-3 to 10^-4 seconds, and the bi-valent agent having a Kdiss of 3x10^-5 seconds or less, allowing for specific detection of posttranslationally modified polypeptides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard immunization and screening methods are used to generate antibodies, then binding agents can be obtained, but they show cross-reactions to other polypeptides, do not exhibit required affinity, and show cross-reactivity to non-modified polypeptide
Solution Approach 1:
The invention divides the binding task into two separate monovalent binders: one that recognizes the posttranslational modification and another that recognizes the polypeptide sequence. This segmentation allows each binder to be optimized for its specific target, improving overall specificity and reducing cross-reactivity while simplifying the manufacturing process for each individual binder.
Solution Approach 2:
The invention creates a composite binding agent by combining two distinct monovalent binders (one for the modification, one for the sequence) into a single bivalent structure. This composite approach leverages the specific advantages of each binder type, achieving high specificity for modified polypeptides while avoiding the limitations of single-antibody approaches.
2Reliability
If monoclonal antibodies are produced to bind strongly to epitopes consisting of secondary modification and parts of the polypeptide, then high affinity binding is achieved, but it turns out very demanding to obtain such antibodies with reproducible and consistent quality
Solution Approach 1:
The invention separates the recognition functions into two independent monovalent binders, eliminating the need to generate complex monoclonal antibodies that recognize combined epitopes. Each simpler binder can be produced with more consistent quality and easier reproducibility, while the bivalent combination achieves the desired high affinity and specificity.
3Measurement precision
If various types of separation and fragmentation techniques are combined with mass spectroscopy to identify posttranslationally modified polypeptide, then identification is achieved, but sophisticated tools and techniques are required
Solution Approach 1:
The invention introduces a specialized bivalent binding agent as an intermediary that specifically captures posttranslationally modified polypeptides. This binding agent serves as a selective mediator that simplifies detection by providing high-specificity binding, eliminating the need for complex separation and mass spectrometry workflows while achieving comparable or superior detection precision.
4Measurement precision
If multiple antibodies with specificity for each position potentially carrying posttranslational modification are used to assess glycosylation status, then comprehensive detection is achieved, but the process becomes more complex requiring several different antibodies
Solution Approach 1:
The bivalent binding agent design provides a universal solution where one agent can detect multiple glycosylation sites through its two binding sites: one recognizing the glycosylation modification itself and the other recognizing the polypeptide sequence. This multi-functional approach reduces the need for multiple specialized antibodies while maintaining comprehensive detection capability.
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 bi-valent binding agent enables efficient and specific detection of posttranslationally modified polypeptides, reducing cross-reactivity and improving the reproducibility and quality of binding, thereby enhancing the accuracy of histological staining procedures.
Implementation Method 1
the first monovalent binder binds to a polypeptide epitope of a target polypeptide
Implementation Method 2
the second monovalent binder binds to a posttranslational polypeptide modification on the target polypeptide
Implementation Method 3
The bi-valent binding agent enables efficient and specific detection of posttranslationally modified polypeptides
Data Source
Figure 1a~1d
Figure 2
Figure 3
AI summary
The present invention relates to a bi-valent binding agent consisting of a first monovalent binder that binds to a polypeptide epitope of a target polypeptide, a second monovalent binder that binds to a posttranslational polypeptide modification on the target polypeptide and a linker. Further disclosed is a method for the detection of a posttranslationally modified target polypeptide by aid of such bi-valent binding agent, a method of making such bi-valent binding agent and the use of such bi-valent agent in histological staining procedures.