Redox activities of mono- and binuclear forms of low-molecular and protein-bound dinitrosyl iron complexes with thiol-containing ligands.

Autor: Borodulin RR; N.N.Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, Russia., Dereven'kov IА; Ivanovo State University of Chemistry and Technology, Ivanovo, Russia; Department of Chemistry and Pharmacy, University of Erlangen-Nürnberg, Germany., Burbaev DSh; N.N.Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, Russia., Makarov SV; Ivanovo State University of Chemistry and Technology, Ivanovo, Russia., Mikoyan VD; N.N.Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, Russia., Serezhenkov VА; N.N.Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, Russia., Kubrina LN; N.N.Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, Russia., Ivanovic-Burmazovic I; Department of Chemistry and Pharmacy, University of Erlangen-Nürnberg, Germany., Vanin AF; N.N.Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, Russia. Electronic address: vanin@polymer.chph.ras.ru.
Jazyk: angličtina
Zdroj: Nitric oxide : biology and chemistry [Nitric Oxide] 2014 Aug 31; Vol. 40, pp. 100-9. Date of Electronic Publication: 2014 Jul 02.
DOI: 10.1016/j.niox.2014.06.005
Abstrakt: EPR, optical, electrochemical and stopped-flow methods were used to demonstrate that Fe(NO)2 fragments in paramagnetic mononuclear and diamagnetic binuclear forms of dinitrosyl iron complexes with glutathione are reversibly reduced by a two-electron mechanism to be further transformed from the initial state with d(7) configuration into states with the d(8) and d(9) electronic configurations of the iron atom. Under these conditions, both forms of DNIC display identical optical and EPR characteristics in state d(9) suggesting that reduction of the binuclear form of DNIC initiates their reversible decomposition into two mononuclear dinitrosyl iron fragments, one of which is EPR-silent (d(8)) and the other one is EPR-active (d(9)). Both forms of DNIC produce EPR signals with the following values of the g-factor: g⊥=2.01, g||=1.97, gaver.=2.0. M-DNIC with glutathione manifest an ability to pass into state d(9), however, only in solutions with a low content of free glutathione. Similar transitions were established for protein-bound М- and B-DNIC with thiol-containing ligands.
(Copyright © 2014 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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