Monovalent Biotin Immunolabeling Complexes Without Antibody Aggregation
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Solution Overview
Problem
Existing immunolabeling methods face challenges in efficiently switching reporter molecules without additional incubation steps and antibody aggregation, particularly in direct methods, due to the limitations of conventional antibody-conjugation techniques.
Innovation Solution
A method using biotin 'click chemistry' to form a stable immunolabeling complex by combining biotinylated antibodies with monovalent biotin-binding compositions, allowing flexible attachment of various reporter elements without antibody aggregation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional antibody-conjugation techniques are used to attach reporter molecules to antibodies, then the immunolabeling can be performed, but the process requires additional incubation steps and causes antibody aggregation
Solution Approach 1:
The invention divides the immunolabeling system into separate functional modules: biotinylated antibodies that bind to targets and monovalent streptavidin-conjugated reporter molecules that provide detection signals. This segmentation allows the antibody to remain unmodified and pre-formed, eliminating incubation steps while preventing aggregation through the monovalent design of the streptavidin component
Solution Approach 2:
The invention introduces biotin as an intermediary molecule that bridges the antibody and reporter molecule. The biotinylated antibody binds to the target, and the monovalent streptavidin-conjugated reporter binds to the biotin, creating a stable complex without requiring direct conjugation between antibody and reporter, thus eliminating incubation time and preventing aggregation
2Measurement precision
If conventional antibody-conjugation techniques are used to attach reporter molecules to antibodies, then the immunolabeling can be performed, but antibody aggregation occurs reducing detection accuracy
Solution Approach 1:
The invention uses monovalent streptavidin instead of conventional tetravalent streptavidin, creating an asymmetric binding configuration where only one biotin-binding site is active. This asymmetry prevents cross-linking and aggregation of antibodies while maintaining stable binding to the biotinylated antibody, thereby improving detection accuracy
Solution Approach 2:
The invention uses biotin as a temporary, easily removable intermediary that facilitates precise binding during detection but can be easily displaced or is naturally transient, allowing for precise measurements without permanent aggregation effects
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 flexible and stable attachment of reporter molecules to antibodies, suitable for both small and large-scale applications, with enhanced signal strength and reduced steric hindrance, facilitating efficient direct immunolabeling without the need for additional incubation steps.
Implementation Method 1
Antibodies are immunoglobulin (Ig) proteins that bind with high specificity through its antigen-binding site to an antigen (target molecule)
Implementation Method 2
Streptavidin (or other derivates of avidin) can also be used in immunolabeling with the indirect method by using biotinylated antibodies. Streptavidin binds strongly to biotin
Implementation Method 3
The reporter molecule (label) is a molecule that can generate a signal, such as an enzyme or fluorochrome
Implementation Method 4
The reporter molecule (label) is a molecule that can generate a signal, such as an enzyme or fluorochrome
Data Source
AI summary
The present invention generally relates to method for forming an immunolabeling complex, the immunolabeling complex comprising a labeled monovalent biotin-binding composition. The invention also related to the use of the antibody-reporter molecule complex for detecting a target in a sample.