Oxidative denitrification of N omega-hydroxy-L-arginine by the superoxide radical anion.
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.
Everett
S A
SA
Gray Laboratory Cancer Research Trust, Mount Vermon Hospital, Northwood, Middlesex, U.K.
Dennis
M F
MF
Patel
K B
KB
Stratford
M R
MR
Wardman
P
P
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*
D009573:Nitrites; D013481:Superoxides; D009569:Nitric Oxide; C068309:N(omega)-hydroxyarginine; D001120:Arginine