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Palladium Oxidative Addition Complexes for Peptide and Protein Cross-linking.


ABSTRACT: A new method for cysteine-lysine cross-linking in peptides and proteins using palladium oxidative addition complexes is presented. First, a biarylphosphine-supported palladium reagent is used to transfer an aryl group bearing an O-phenyl carbamate substituent to a cysteine residue. Next, this carbamate undergoes chemoselective acyl substitution by a proximal lysine to form a cross-link. The linkage so formed is stable toward acid, base, oxygen, and external thiol nucleophiles. This method was applied to cross-link cysteine with nearby lysines in sortase A*. Furthermore, we used this method for the intermolecular cross-linking between a peptide and a protein based on the p53-MDM2 interaction. These studies demonstrate the potential for palladium-mediated methods to serve as a platform for the development of future cross-linking techniques for peptides and proteins with natural amino acid residues.

SUBMITTER: Kubota K 

PROVIDER: S-EPMC5831526 | biostudies-literature | 2018 Feb

REPOSITORIES: biostudies-literature

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Palladium Oxidative Addition Complexes for Peptide and Protein Cross-linking.

Kubota Koji K   Dai Peng P   Pentelute Bradley L BL   Buchwald Stephen L SL  

Journal of the American Chemical Society 20180213 8


A new method for cysteine-lysine cross-linking in peptides and proteins using palladium oxidative addition complexes is presented. First, a biarylphosphine-supported palladium reagent is used to transfer an aryl group bearing an O-phenyl carbamate substituent to a cysteine residue. Next, this carbamate undergoes chemoselective acyl substitution by a proximal lysine to form a cross-link. The linkage so formed is stable toward acid, base, oxygen, and external thiol nucleophiles. This method was ap  ...[more]

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