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Advances in phase plate cryo-EM imaging of DNA and nucleosomes

机译:DNA和核小体的相板冷冻-EM成像技术的进展

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Contrast in electron cryo-microscopy (cryo-EM) is limited by the weak phase and radiation sensitive nature of biologic samples embedded in vitrified ice. We have recently shown that a new contrast enhancement technique utilizing the Volta phase plate can be combined with single particle analysis to determine the structure of a small chromatin complex, the nucleosome core particle, at near-atomic resolution. Here, we discuss advantages and limitations of the technique in terms of data collection, particle detection, and visualization of individual DNA molecules and higher-order chromatin structure.
机译:电子冷冻显微镜(cryo-EM)的对比度受到埋在玻璃化冰中的生物样品的弱相和辐射敏感性的限制。我们最近表明,可以将利用Volta相板的新对比度增强技术与单颗粒分析结合起来,以接近原子的分辨率确定小的染色质复合物(核小体核心颗粒)的结构。在这里,我们讨论了该技术在数据收集,粒子检测以及单个DNA分子和高阶染色质结构的可视化方面的优势和局限性。

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