title: Attachment of peptide building blocks to proteins through tyrosine bioconjugation.
abstract: Recent efforts have yielded a number of short peptide sequences with useful binding, sensing, and cellular uptake properties. In order to attach these sequences to tyrosine residues on intact proteins, a three-component Mannich-type strategy is reported. Two solid phase synthetic routes were developed to access peptides up to 20 residues in length with anilines at either the N- or C-termini. In the presence of 20 mM formaldehyde, these functional groups were coupled to tyrosine residues on proteins under mild reaction conditions. The identities of the resulting bioconjugates were confirmed using mass spectrometry and immunoblot analysis. Screening experiments have demonstrated that the method is compatible with substrates containing all of the amino acids, including lysine and cysteine residues. Importantly, tyrosine residues on proteins exhibit much faster reaction rates, allowing short peptides containing this residue to be coupled without cross reactions.
authors: Department of Chemistry, University of California, Berkeley, California 94720-1460, USA.
authors: Dante W
authors: DW
authors: Romanini
authors: Matthew B
authors: MB
authors: Francis
mesh_terms: D000595:Amino Acid Sequence; D002919:Chymotrypsinogen / Q000737:chemistry; D005557:Formaldehyde / Q000737:chemistry; D015151:Immunoblotting; D008352:Mannich Bases / Q000737:chemistry; D010455:Peptides / Q000032:analysis / Q000737:chemistry*; D011506:Proteins / Q000032:analysis / Q000737:chemistry*; D021241:Spectrometry, Mass, Electrospray Ionization; D014443:Tyrosine / Q000737:chemistry*
chemical_list: D008352:Mannich Bases; D010455:Peptides; D011506:Proteins; D005557:Formaldehyde; D014443:Tyrosine; D002919:Chymotrypsinogen