L. Yu. Ustynyuk, V. A. Medvedeva, S. O. Liubimovskii, E. K. Ruuge, A. N. Tikhonov
{"title":"Interaction of Magnesium Ions with Semiquinone Radicals of Tiron, an Indicator of Reactive Oxygen Species","authors":"L. Yu. Ustynyuk, V. A. Medvedeva, S. O. Liubimovskii, E. K. Ruuge, A. N. Tikhonov","doi":"10.1134/s0006350923060192","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>It has been shown using experimental (electron paramagnetic resonance) and quantum chemical (density functional theory) research methods that the previously observed changes in the electron paramagnetic resonance spectrum of the semiquinone Tiron radical in seawater are due to its interaction with Mg<sup>2+</sup> ions. The formation of a complex between Mg<sup>2+</sup> and the Tiron radical is due to the electrostatic attraction of ions carrying large charges of the opposite sign (+2 and –3), on the one hand, and the ability of Mg<sup>2+</sup> ions to bind effectively to bidentate oxygen-containing ligands, on the other hand. The formation of tight contact ion pairs leads to a redistribution of the electron and spin density in the Tiron radical, which can be judged by the observed changes in the electron paramagnetic resonance spectrum of this radical.</p>","PeriodicalId":493,"journal":{"name":"Biophysics","volume":null,"pages":null},"PeriodicalIF":4.0330,"publicationDate":"2024-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Biophysics","FirstCategoryId":"4","ListUrlMain":"https://doi.org/10.1134/s0006350923060192","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"Biochemistry, Genetics and Molecular Biology","Score":null,"Total":0}
引用次数: 0
Abstract
It has been shown using experimental (electron paramagnetic resonance) and quantum chemical (density functional theory) research methods that the previously observed changes in the electron paramagnetic resonance spectrum of the semiquinone Tiron radical in seawater are due to its interaction with Mg2+ ions. The formation of a complex between Mg2+ and the Tiron radical is due to the electrostatic attraction of ions carrying large charges of the opposite sign (+2 and –3), on the one hand, and the ability of Mg2+ ions to bind effectively to bidentate oxygen-containing ligands, on the other hand. The formation of tight contact ion pairs leads to a redistribution of the electron and spin density in the Tiron radical, which can be judged by the observed changes in the electron paramagnetic resonance spectrum of this radical.
BiophysicsBiochemistry, Genetics and Molecular Biology-Biophysics
CiteScore
1.20
自引率
0.00%
发文量
67
期刊介绍：
Biophysics is a multidisciplinary international peer reviewed journal that covers a wide scope of problems related to the main physical mechanisms of processes taking place at different organization levels in biosystems. It includes structure and dynamics of macromolecules, cells and tissues; the influence of environment; energy transformation and transfer; thermodynamics; biological motility; population dynamics and cell differentiation modeling; biomechanics and tissue rheology; nonlinear phenomena, mathematical and cybernetics modeling of complex systems; and computational biology. The journal publishes short communications devoted and review articles.
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