A Functional Model for the Cysteinate-Ligated Non-Heme Iron Enzyme Superoxide Reductase (SOR)
作者:Terutaka Kitagawa、Abhishek Dey、Priscilla Lugo-Mas、Jason B. Benedict、Werner Kaminsky、Edward Solomon、Julie A. Kovacs
DOI:10.1021/ja064870d
日期:2006.11.1
Superoxidereductases (SORs) are cysteine-ligated, non-heme iron enzymes that reduce toxic superoxide radicals (O2-). The functional role of the trans cysteinate, as well as the mechanism by which SOR reduces O2-, is unknown. Herein is described a rare example of a functional metalloenzyme analogue, which catalytically reduces superoxide in a proton-dependent mechanism, via a trans thiolate-ligated
The mechanism of oxidation of alkanes by peroxo complexes of iron porphyrins in the presence of acylating agents: a model for activation of O2 by cytochrome P-450
作者:Alexander M. Khenkin、Albert A. Shteinman
DOI:10.1039/c39840001219
日期:——
A new model for cytochromeP-450oxidation of alkanes, which imitates the process of O2activation by cytochromeP-450, involving the formation of ironporphyrinperoxocomplexes in the presence of acylatingagents is proposed.
Reductive activation of O2 is achieved by using the [FeIII(F20TPP)Cl] (F20TPP = 5,10,15,20-tetrakis(pentafluorophenyl) porphyrinate) porphyrin through electrochemicalreduction of the [FeIII(F20TPP)(O2•–)] superoxo complex. Formation of the [FeIII(F20TPP)(OO)]− peroxo species is monitored by using low-temperature electronic absorption spectroscopy, electronparamagneticresonance, and cyclic voltammetry