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Electron flux through apo- and holoferritin

机译:通过载脂蛋白和全铁蛋白的电子通量

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Conductive probe atomic force microscopy ( CP-AFM) has been used to investigate electronic transport through the protein ferritin in both its holo and apo forms. The presence of the iron oxide core has a notable effect on both conductance and the molecular response to probe-induced compression. This response can also be contrasted with that of the much smaller metalloprotein cytochrome c, across which electron transport can be simulated by a single non-resonant tunnel barrier model. Tapping mode AFM imaging, in different compressional regimes, reveals both the mineral core of holoferritin and significant collapse of the hollow protein cavity of apoferritin. These topographic findings correlate well with CP-AFM conductance data and facilitate a clearer description of electron transport across these molecules.
机译:导电探针原子力显微镜(CP-AFM)已被用于研究通过铁蛋白的完整形式和载脂蛋白形式的电子传输。氧化铁核的存在对电导率和对探针诱导的压缩的分子响应均具有显着影响。该响应也可以与更小的金属蛋白细胞色素c的响应形成对比,后者可以通过单个非共振隧道势垒模型来模拟电子传输。轻击模式原子力显微镜成像,在不同的压缩方式下,揭示了铁铁蛋白的矿物质核心和载铁蛋白的空心蛋白腔的明显塌陷。这些形貌的发现与CP-AFM电导数据非常相关,并有助于更清晰地描述电子在这些分子之间的传输。

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