title: Study of the chemical structures of the photo-cross-linking products between Tyr and the 5-azido-2-nitrobenzoyl residue.
abstract: Irradiation of N-(tyrosyl)-N'-(5-azido-2-nitrobenzoyl)-1,2-diaminoethane (I) initiates chemical reactions that lead to different products depending on the experimental conditions. All of these products are attributed to the reactions of triplet 4-nitrobenzoyl nitrene (4NBN). The reactions of triplet 4NBN with the tyrosyl residue result in the formation of two distinct products: compound II, which is unstable in aqueous solution, and the stable compound cyclo-[1-(4'-nitro-3'-benzoyl)-2-(aminotyrosyl)-N,N'-ethylenediami ne] (III). The formation of II is detected only in aerobic conditions. The unstable photoproduct II converts almost completely into compound III when its solution is concentrated. The photoproducts II and III have absorption spectra that are close to those of the photolabelled peptides. This finding is important for speculating about the chemical nature of the photomodification products of protein tyrosyl residues by the arylazide group.
authors.affiliation: Institute of Bioorganic Chemistry, Siberian Division of the Russian Academy of Science, Novosibirsk, Russia.
authors.forename: E L
authors.initials: EL
authors.lastname: Mishchenko
authors.forename: L A
authors.initials: LA
authors.lastname: Kozhanova
authors.lastname: Denisov AYu
authors.forename: N P
authors.initials: NP
authors.lastname: Gritsan
authors.lastname: Markushin YYa
authors.forename: M V
authors.initials: MV
authors.lastname: Serebriakova
authors.forename: T S
authors.initials: TS
authors.lastname: Godovikova
mesh_terms: D003432:Cross-Linking Reagents; D009682:Magnetic Resonance Spectroscopy; D010777:Photochemistry; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D013053:Spectrophotometry; D014443:Tyrosine / Q000031:analogs & derivatives* / Q000737:chemistry* / Q000528:radiation effects; D014466:Ultraviolet Rays
chemical_list: D003432:Cross-Linking Reagents; C409525:N-(tyrosyl)-N'-(5-azido-2-nitrobenzoyl)-1,2-diaminoethane; D014443:Tyrosine