title: Chemistry of periodate-mediated cross-linking of 3,4-dihydroxylphenylalanine-containing molecules to proteins.
abstract: Chemical cross-linking is an attractive approach to map peptide-protein and protein-protein complexes. Previously, we explored 3,4-dihydroxylphenylalanine (DOPA) as a protein cross-linking agent upon periodate oxidation (Burdine, L.; Gillette, T. G.; Lin, H.-J.; Kodadek, T. J. Am. Chem. Soc. 2004, 126, 11442-11443). We report here a study on the chemistry of DOPA-protein cross-linking. First, using a peptide nucleic acid templated system, we identified the alpha-amino, epsilon-amino of Lys, imidazole of His, and thiol of Cys as functional groups capable of attacking DOPA ortho-quinone. Second, we demonstrated that periodate-induced DOPA-protein cross-linking could be carried out efficiently at neutral pH in the presence of excess aliphatic 1,2-diols such as ethylene glycol, lactose, and adenosine triphosphate. This result indicated that DOPA-protein cross-linking and 1,2-diol oxidative cleavage proceed via different mechanisms and that carbohydrates will not interfere with this process when carried out in crude cell extracts or on intact cells.
authors.affiliation: Division of Translational Research, Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas 75390, USA.
authors.forename: Bo
authors.initials: B
authors.lastname: Liu
authors.forename: Lyle
authors.initials: L
authors.lastname: Burdine
authors.forename: Thomas
authors.initials: T
authors.lastname: Kodadek
mesh_terms: D000596:Amino Acids / Q000737:chemistry; D002851:Chromatography, High Pressure Liquid; D003432:Cross-Linking Reagents / Q000737:chemistry; D004295:Dihydroxyphenylalanine / Q000031:analogs & derivatives* / Q000737:chemistry; D020135:Peptide Nucleic Acids / Q000737:chemistry*; D010504:Periodic Acid / Q000737:chemistry*; D011809:Quinones / Q000737:chemistry; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
chemical_list: D000596:Amino Acids; D003432:Cross-Linking Reagents; D020135:Peptide Nucleic Acids; D011809:Quinones; D010504:Periodic Acid; D004295:Dihydroxyphenylalanine; C009288:metaperiodate