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• W2023558712 endingPage "5375" @default.
• W2023558712 startingPage "5360" @default.
• W2023558712 abstract "The synthetic heme-thiolate complex (SR) in methanol binds nitric oxide (k(on) = (2.7 +/- 0.2) x10(6) M(-)(1) s(-)(1) at 25 degrees C) to form SR(NO). The binding of NO to the SR complex in a noncoordinating solvent, such as toluene, was found to be almost 3 orders of magnitude faster than that in methanol. The activation parameters DeltaH(), DeltaS(), and DeltaV() for the formation of SR(NO) in methanol are consistent with the operation of a limiting dissociative mechanism, dominated by dissociation of methanol in SR(MeOH). In the presence of an excess of NO, the formation of SR(NO) is followed by subsequent slower reactions. The substantially negative activation entropy and activation volume values found for the second observed reaction step support an associative mechanism which involves attack of a second NO molecule on the thiolate ligand in the initially formed SR(NO) complex. The following slower reactions are strongly accelerated by a large excess of NO or by the presence of NO(2)(-) in the SR/NO reaction mixture. They can be accounted for in terms of dynamic equilibria between higher nitrogen oxides (NO(x)()) and reactive SR species, which lead to the formation of a nitrosyl-nitrite complex of SR(Fe(II)) as the final product. This finding is clearly supported by laser flash photolysis studies on the SR/NO reaction mixture, which do not reveal simple NO photolabilization from SR(Fe(III))(NO), but rather involve the generation of at least three photoinduced intermediates decaying with different rate constants to the starting material. The species formed along the proposed reaction pathways were characterized by FTIR and EPR spectroscopy. The results are discussed in terms of their relevance for the biological function of cytochrome P450 enzymes and in context of results for the reaction of NO with imidazole- and thiolate-ligated iron(III) hemoproteins." @default.
• W2023558712 created "2016-06-24" @default.
• W2023558712 creator A5000501841 @default.
• W2023558712 creator A5008794951 @default.
• W2023558712 creator A5010773766 @default.
• W2023558712 creator A5023399985 @default.
• W2023558712 creator A5068086547 @default.
• W2023558712 creator A5080879830 @default.
• W2023558712 date "2005-03-25" @default.
• W2023558712 modified "2023-10-17" @default.
• W2023558712 title "Mechanistic Studies on the Binding of Nitric Oxide to a Synthetic Heme−Thiolate Complex Relevant to Cytochrome P450" @default.
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