Saturation behavior of superoxide dismutation catalyzed by the iron containing superoxide dismutase of E. coli B

Saturation behavior of superoxide dismutation catalyzed by the iron containing superoxide dismutase of E. coli B.

The iron containing superoxide dismutase from E. coli B is shown to catalyze superoxide dismutation by a mechanism which exhibits saturation kinetics. This behavior is quite different from that observed previously with bovine Zn/Cuand iron-containing superoxide dismutase from P. leiosnathi. Two parameters of catalysis were measured in the pH range 7.2 to 10.4: k was found to be independent of p...

Oxoammonium cation intermediate in the nitroxide-catalyzed dismutation of superoxide.

Dismutation of superoxide has been shown previously to be catalyzed by stable nitroxide compounds. In the present study, the mechanism of superoxide (.O2-) dismutation by various five-membered ring and six-membered ring nitroxides was studied by electron paramagnetic resonance spectrometry, UV-visible spectrophotometry, cyclic voltammetry, and bulk electrolysis. Electron paramagnetic resonance ...

Superoxide dismutase Superoxide dismutase

Distribution of iron-containing superoxide dismutase in vascular plants.

Superoxide dismutases (EC 1.15.1.1) in vascular plants representing different evolutionary levels were characterized using polyacrylamide gel electrophoresis. The three forms of the enzyme were distinguished from each other based on the following criteria: a) the Cu-Zn enzyme is sensitive to cyanide wherease the Fe and Mn enzymes are not; and b) the Cu-Zn and Fe enzymes are inhibited by H(2)O(2...

Salivary superoxide dismutase activity in the consumers of paan containing tobacco

Introduction:The habit of smokeless tobacco chewing is one of the known risk factors for oral cancer among the residents of southeast of Iran. Most likely, the antioxidant defense system in dealing with free radicals induced paan and prevention of oral cancer is important. In this study, the activity of superoxide dismutase is compared in the saliva of paan consumers and non-consumers. Metho...