Journal
BIOCONJUGATE CHEMISTRY
Volume 26, Issue 2, Pages 197-200Publisher
AMER CHEMICAL SOC
DOI: 10.1021/bc500610g
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Funding
- SATT Conectus BioReLiable project, CNRS, University of Strasbourg
- GIS IBiSA
- International Center for Frontier Research in Chemistry (icFRC)
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Amine-to-thiol coupling is the most common route for the preparation of antibody-drug conjugates (ADC). It is usually achieved by using heterobifunctional reagents possessing an activated ester at one end and a maleimide group at the other. However, maleimide-based conjugates were recently revealed to have limited stability in blood circulation, which can compromise therapeutic efficacy of the conjugate. To address this issue, we have developed a heterobifunctional reagent, sodium 4-((4-(cyanoethynyl)benzoyl)oxy)-2,3,5,6-tetrafluorobenzenesulfonate (CBTF), for amine-to-thiol coupling. It comprises a recently described 3-arylpropionitrile (APN) function in replacement of maleimide and allows for the preparation of remarkably stable conjugates. A series of antibody-dye conjugates have been prepared using this reagent and shown superior stability in human blood plasma compared to maleimide-derived conjugates.
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