FRET Assay for Bispecific Antibody Binding Precision
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Solution Overview
Problem
Current methods for determining the binding of bispecific antibodies to multiple antigens simultaneously are limited in precision and efficiency, particularly in assessing the binding affinity and interaction strength of antibodies with different KD values.
Innovation Solution
A method utilizing FRET (Fluorescence Resonance Energy Transfer) assays, where cells expressing FRET-donor and FRET-acceptor tagged antigens are incubated with bispecific antibodies, allowing for the determination of energy transfer and binding interaction by measuring fluorescence changes, with the option to repeat in increasing concentrations of monospecific antibodies to assess binding strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current methods are used to determine binding of bispecific antibodies to multiple antigens, then the assessment can be performed, but the precision and efficiency of measuring binding affinity and interaction strength are limited
Solution Approach 1:
The patent replaces traditional mechanical/chemical binding assays with an optical detection system based on FRET (Fluorescence Resonance Energy Transfer). By tagging antigens with FRET donor and acceptor fluorophores, the system optically detects when a bispecific antibody simultaneously binds both antigens, providing precise measurement of binding affinity and efficiency high-throughput assessment.
Solution Approach 2:
The invention utilizes fluorescence color changes and energy transfer between FRET donor and acceptor tags to indicate simultaneous binding events. When the bispecific antibody bridges both antigens, the FRET signal changes, providing a precise and easily measurable indicator of binding that can be assessed efficiently.
2Measurement precision
If FRET assays are used to determine simultaneous binding, then measurement precision and efficiency are improved, but the device complexity increases due to requiring FRET-donor and FRET-acceptor tagged antigens
Solution Approach 1:
The antigens are pre-tagged with FRET donor and acceptor fluorophores before the binding assay. This preliminary tagging allows the FRET system to be already in place and ready for detection, reducing the complexity of the actual measurement step while maintaining high precision in binding interaction measurement.
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
This approach provides a precise and efficient method for determining the simultaneous binding of bispecific antibodies to multiple antigens, enabling the measurement of binding affinity and interaction strength, thereby improving the assessment of antibody-antigen interactions.
Implementation Method 1
Fluorescence Resonance Energy Transfer (FRET) is a physical phenomenon first described over 50 years ago. FRET is based on the radiationless transfer of energy from a donor molecule to an acceptor molecule. No direct contact of both molecules is required therefore, i.e. it is a distance-dependent energy transfer.
Data Source
AI summary
Herein is reported a method for the determination of the simultaneous binding of a bispecific antibody to a first and a second antigen comprising the steps of a) incubating a cell expressing cell-membrane bound FRET-donor-tagged first antigen and FRET-acceptor-tagged second antigen with the bispecific antibody, and b) determining the simultaneous binding of the bispecific antibody by determining the energy transfer from the FRET-donor to the FRET-acceptor.