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Updated: May 19, 2026

Genetic Encoding of a Non-Canonical Amino Acid for the Generation of Antibody-Drug Conjugates Through a Fast Bioorthogonal Reaction
Published on: September 14, 2018
Profiling antibody drug conjugate positional isomers: a system-of-equations approach
Lan N Le1, Jamie M R Moore, Jun Ouyang
1Early Stage Pharmaceutical Development, Genentech, Inc, South San Francisco, California 94080, United States.
We developed a mathematical method to analyze antibody drug conjugates (ADCs), which deliver chemotherapy to cancer cells. This technique precisely maps drug locations on antibodies, revealing consistent conjugation patterns.
Area of Science:
- Bioconjugation Chemistry
- Pharmaceutical Sciences
- Analytical Chemistry
Background:
- Antibody drug conjugates (ADCs) are crucial for targeted cancer therapy.
- ADCs link potent cytotoxins to monoclonal antibodies for precise drug delivery.
- Current conjugation methods produce heterogeneous mixtures of ADCs.
Purpose of the Study:
- To develop a mathematical approach for determining positional isomer distribution in ADCs.
- To enable precise characterization of ADC heterogeneity.
- To validate the analytical method with isolated ADC species.
Main Methods:
- Utilized capillary electrophoresis (CE) and hydrophobic interaction chromatography (HIC).
- Developed a mathematical model integrating CE and HIC data.
- Confirmed results by analyzing isolated antibody-drug conjugate species.
Main Results:
- Successfully determined the positional isomer distribution of ADCs.
- The method demonstrated low material requirements and rapid analysis.
- Analysis of multiple ADCs showed highly similar isomer distributions, indicating a robust conjugation process.
Conclusions:
- The developed mathematical approach accurately characterizes ADC positional isomerism.
- This technique offers a reliable and efficient method for ADC quality control.
- Consistent isomer distribution suggests a predictable and robust antibody-drug conjugation process.
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