Together for ever…: Cross-linking of proteins by a ditryptophan bond

Cross-linking of proteins by a ditryptophan bond

by Verônica Paviani

Oxidative modifications of proteins are extensively investigated because proteins are major targets of radicals and oxidants under physiological conditions [1]. The amino acid residues most susceptible to oxidation are the sulfur-containing residues cysteine and methionine and the aromatic residues histidine, phenylalanine, tyrosine and tryptophan. The oxidation of cysteine and methionine residues is reversible and protein-cysteine oxidation is emerging as a fundamental cell regulatory mechanism. In contrast, the oxidation of all other protein residues is irreversible, and may result in loss of protein