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Updated: Aug 13, 2026

Photo-Induced Cross-Linking of Unmodified Proteins (PICUP) Applied to Amyloidogenic Peptides
Published on: January 12, 2009
Highly specific oxidative cross-linking of proteins mediated by a nickel-peptide complex
K C Brown1, S H Yang, T Kodadek
1Department of Chemistry and Biochemistry, University of Texas at Austin 78712-1096, USA.
Abstract:
The Ni(II) complex of the tripeptide NH2-Gly-Gly-His-COOH is shown to mediate efficient protein-protein cross-linking in the presence of oxidants such as oxone and monoperoxyphthalic acid. Only proteins that associate specifically in solution are cross-linked under these conditions. Preliminary probes of the mechanism of the reaction suggest that the active intermediate may be a high-valent metal complex that attacks aromatic amino acids.
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