Dichloro Butenediamides as Irreversible Site-Selective Protein Conjugation Reagent.

ABSTRACT: We 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 scaffo

SUBMITTER: Laserna V 

PROVIDER: S-EPMC8596790 | biostudies-literature | 2021 Oct

REPOSITORIES: biostudies-literature