title: Characterization of bis(levuglandinyl) urea derivatives as products of the reaction between prostaglandin H2 and arginine.
abstract: Levuglandins are gamma-keto aldehydes formed by rearrangement of prostaglandin (PG) H(2) in aqueous solution. Levuglandins are highly reactive with primary amines. We had previously characterized adducts formed after reaction of levuglandin E(2) (LGE(2)) or PGH(2) with lysine. In this study, we assessed whether reaction of PGH(2) with arginine yielded covalent adducts. Using N(alpha)-acetylarginine and both PGH(2) and synthetic LGE(2), we discovered a novel series of levuglandinyl adducts derived from reaction of two levuglandin moieties with the guanidino group of arginine. Subsequent spontaneous hydrolysis of the adducted amino acid yields bis(levuglandinyl) urea and the corresponding ornithine residue. Using liquid chromatography tandem mass spectrometry, we characterized the molecular structure of these novel adducts and demonstrated their formation after coincubation of PGH(2) with synthetic peptides and proteins. The soluble characteristic of these molecules provides a potential strategy for development of biological markers of lipid modification of proteins following cyclooxygenase activity or lipid peroxidation.
authors.affiliation: Department of Pharmacology, Vanderbilt University, Nashville, Tennessee 37232-6602, USA.
authors.forename: Irene
authors.initials: I
authors.lastname: Zagol-Ikapitte
authors.forename: Nathalie
authors.initials: N
authors.lastname: Bernoud-Hubac
authors.forename: Venkataraman
authors.initials: V
authors.lastname: Amarnath
authors.forename: L Jackson
authors.initials: LJ
authors.lastname: Roberts
authors.forename: Olivier
authors.initials: O
authors.lastname: Boutaud
authors.forename: John A
authors.initials: JA
authors.lastname: Oates
mesh_terms: D000447:Aldehydes / Q000737:chemistry*; D016229:Amyloid beta-Peptides / Q000737:chemistry; D001120:Arginine / Q000737:chemistry*; D019791:Guanidine / Q000737:chemistry; D006657:Histones / Q000737:chemistry; D006801:Humans; D008239:Lysine / Q000737:chemistry; D009952:Ornithine / Q000737:chemistry; D010446:Peptide Fragments / Q000737:chemistry; D044262:Prostaglandin H2 / Q000737:chemistry*; D011458:Prostaglandins E / Q000737:chemistry*; D012545:Schiff Bases / Q000737:chemistry; D012709:Serum Albumin / Q000737:chemistry; D021241:Spectrometry, Mass, Electrospray Ionization; D014508:Urea / Q000031:analogs & derivatives* / Q000737:chemistry*
chemical_list: D000447:Aldehydes; D016229:Amyloid beta-Peptides; D006657:Histones; D010446:Peptide Fragments; D011458:Prostaglandins E; D012545:Schiff Bases; D012709:Serum Albumin; C075222:amyloid beta-protein (1-42); D044262:Prostaglandin H2; D014508:Urea; C047684:levuglandin E2; D001120:Arginine; D009952:Ornithine; D019791:Guanidine; D008239:Lysine