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Copper(II) complexes with Fusobacterium nucleatum adhesin FadA: Coordination pattern, physicochemical properties and reactivity
Journal of Inorganic Biochemistry ( IF 3.9 ) Pub Date : 2018-09-18 , DOI: 10.1016/j.jinorgbio.2018.09.012
Katarzyna Krupa , Monika Lesiów , Kamila Stokowa-Sołtys , Radosław Starosta , Natalia Ptaszyńska , Anna Łęgowska , Krzysztof Rolka , Maciej Wernecki , Magdalena Cal , Małgorzata Jeżowska-Bojczuk

Fusobacterium nucleatum is an anaerobic, Gram-negative bacteria linked to colon cancer. It is interesting to determine how metal ions interact with bacterial adhesin proteins. To this end, the coordination of ATDAAS-NH2 and MKKFL-NH2 fragments of Fusobacterium adhesin A (FadA) to copper(II) ions was studied by potentiometry, spectroscopic techniques (UV–Vis, CD, EPR and NMR) and the density functional theory (DFT) methods. At pH 6.8 (colon physiological pH), the metal ion in the first peptide (ATDAAS-NH2) is coordinated by one oxygen and three nitrogen donors while in the second one (MKKFL-NH2) - by sulfur and three nitrogen atoms. Both complexes form two five- and one six-membered stable chelate rings. Moreover, reactivity studies confirmed the production of reactive oxygen species such as hydroxyl radical, superoxide anion radical and singlet oxygen. Generation of reactive oxygen species (ROS) was observed during gel electrophoresis and spectroscopic assays with reporting molecules like NDMA (N,N-dimethyl-p-nitrosoaniline) and NBT (Nitrotetrazolium Blue Chloride). All reactions were conducted in the presence of hydrogen peroxide as endogenous oxidant.



中文翻译:

铜(II)与梭状芽胞杆菌粘附素FadA的配合物:配位模式,物理化学性质和反应性

核梭菌是与结肠癌相关的厌氧,革兰氏阴性细菌。确定金属离子如何与细菌粘附素蛋白相互作用是很有趣的。为此,通过电位计,光谱技术(UV-Vis,CD,EPR和NMR)和电离光谱法研究了黏附杆菌粘附素A(FadA)的ATDAAS-NH 2和MKKFL-NH 2片段与铜离子的配位作用。密度泛函理论(DFT)方法。在pH 6.8(结肠生理pH),在所述第一肽的金属离子(ATDAAS-NH 2)由一个氧和三个氮供体配位,而在第二个(MKKFL-NH 2)-由硫和三个氮原子组成。两个复合物形成两个五元和一个六元稳定的螯合环。此外,反应性研究证实了活性氧的产生,例如羟基自由基,超氧阴离子自由基和单线态氧。在凝胶电泳和光谱测定中观察到活性氧物质(ROS)的生成,其中报告分子为NDMA(NN-二甲基-亚硝基苯胺)和NBT(硝基四唑蓝氯化物)。所有反应均在过氧化氢作为内源氧化剂的条件下进行。

更新日期:2018-09-18
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