title: Oxidative denitrification of N omega-hydroxy-L-arginine by the superoxide radical anion.
abstract: The superoxide radical anion (O2-.) produced during the catalytic activity of nitric oxide synthase (NOS) and cytochrome P-450 has been implicated in the oxidative denitrification of hydroxyguanidines ( > C = NOH). The reactivity of the radiolytically generated O2-. radical with N omega-hydroxy-L-arginine (NHA) is pH dependent and appears to parallel the prototropic equilibrium of the hydroxyguanidino group ( > C = NOH reversible > C = NO(-)+H+; pK = 8). The N omega-hydroxyguanidino group is more reactive towards O2-. when deprotonated but exhibits negligible reactivity when protonated. Based on a model, the rate constant for the reaction of the O2-. with NHA was estimated as kappa (O2-.+ > C = NO-) approximately 200-500 M-1.s-1, which is probably too low to compete with O2-. reactions with NO- or superoxide dismutase, which occur many orders of magnitude faster. The oxidative elimination of NO from NHA by O2-. was not accompanied by the formation of L-citrulline. Since only 21% of NHA will exist in the deprotonated > C = NO- form at physiological pH, it is unlikely that oxidative denitrification of NHA by cytochrome P-450 or NOS-derived O2-. radicals will prove a major free-radical pathway to NO. and L-citrulline.
authors.affiliation: Gray Laboratory Cancer Research Trust, Mount Vermon Hospital, Northwood, Middlesex, U.K.
authors.forename: S A
authors.initials: SA
authors.lastname: Everett
authors.forename: M F
authors.initials: MF
authors.lastname: Dennis
authors.forename: K B
authors.initials: KB
authors.lastname: Patel
authors.forename: M R
authors.initials: MR
authors.lastname: Stratford
authors.forename: P
authors.initials: P
authors.lastname: Wardman
mesh_terms: D001120:Arginine / Q000031:analogs & derivatives* / Q000737:chemistry / Q000528:radiation effects; D006863:Hydrogen-Ion Concentration; D008956:Models, Chemical; D009569:Nitric Oxide / Q000032:analysis; D009573:Nitrites / Q000032:analysis; D010084:Oxidation-Reduction; D013481:Superoxides / Q000737:chemistry*
chemical_list: D009573:Nitrites; D013481:Superoxides; D009569:Nitric Oxide; C068309:N(omega)-hydroxyarginine; D001120:Arginine