Department of Chemistry, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, 45137-66731, Iran.
Surface Protection Research Group, Surface Department, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, 519 Zhuangshi Road, Ningbo, 315201, China.
Sci Rep. 2019 Aug 8;9(1):11499. doi: 10.1038/s41598-019-47661-z.
Ferritin is a protein (ca. 12 nm) with a central pocket of 6 nm diameter, and hydrated iron oxide stored in this central cavity of this protein. The protein shell has a complicated structure with 24 subunits. Transmission electron microscopy images of ferritin showed nanosized iron oxides (ca. 4-6 nm) in the protein structure. In high-resolution transmission electron microscopy images of the iron core, d-spacings of 2.5-2.6 Å were observed, which is corresponded to d-spacings of ferrihydrite crystal structure. Our experiments showed that at pH 11, the modified electrode by this biomolecule is active for water oxidation (turnover frequency: 0.001 s at 1.7 V). Using affected by bacteria, we showed that Fe ions in the structure of ferritin are critical for water oxidation.
铁蛋白是一种蛋白（约 12nm），具有 6nm 直径的中央口袋，并且水合氧化铁储存在该蛋白的中央腔中。该蛋白壳具有复杂的结构，由 24 个亚基组成。铁蛋白的透射电子显微镜图像显示出纳米级的氧化铁（约 4-6nm）存在于蛋白结构中。在铁核心的高分辨率透射电子显微镜图像中，观察到 2.5-2.6Å 的 d 间距，这与水铁矿晶体结构的 d 间距相对应。我们的实验表明，在 pH 值为 11 时，这种生物分子修饰的电极对水氧化具有活性（在 1.7V 时的周转率频率：0.001s）。通过受细菌影响的实验，我们表明铁蛋白结构中的 Fe 离子对水氧化至关重要。
Sci Rep. 2019-8-8
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