Repository logo

Dichloro Butenediamides as Irreversible Site‐Selective Protein Conjugation Reagent

Published version

Change log


Laserna, Victor 
Abegg, Daniel 
Martin, Esther M 
Adibekian, Alexander 


jats:titleAbstract</jats:title>jats:pWe describe maleic‐acid derivatives as robust cysteine‐selective reagents for protein labelling with comparable kinetics and superior stability relative to maleimides. Diamide and amido‐ester derivatives proved to be efficient protein‐labelling species with a common mechanism in which a spontaneous cyclization occurs upon addition to cysteine. Introduction of chlorine atoms in their structures triggers ring hydrolysis or further conjugation with adjacent residues, which results in conjugates that are completely resistant to retro‐Michael reactions in the presence of biological thiols and human plasma. By controlling the microenvironment of the reactive site, we can control selectivity towards the hydrolytic pathway, forming homogeneous conjugates. The method is applicable to several scaffolds and enables conjugation of different payloads. The synthetic accessibility of these reagents and the mild conditions required for fast and complete conjugation together with the superior stability of the conjugates make this strategy an important alternative to maleimides in bioconjugation.</jats:p>



3405 Organic Chemistry, 34 Chemical Sciences, Generic health relevance

Journal Title

Angewandte Chemie

Conference Name

Journal ISSN


Volume Title


European Commission Horizon 2020 (H2020) Marie Sk?odowska-Curie actions (836698)
European Commission (EC) (852985)