Compressed sensing for electron cryotomography and high-resolution subtomogram averaging of biological specimens.

Compressed sensing for electron cryotomography and high-resolution subtomogram averaging of biological specimens.
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DOI:
10.1016/j.str.2021.12.010
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发表时间:
2022-03-03
期刊:
Structure (London, England : 1993)
影响因子:
--
通讯作者:
Collins SM
Collins SM
中科院分区:
其他
文献类型:
--
作者:
Böhning J;Bharat TAM;Collins SM

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冷冻电子断层扫描(cryo-ET)和亚断层图像平均(STA)允许直接可视化和生物大分子在其天然细胞环境中的结构研究,在原位。通常,断层图像中的低信噪比、细胞内的低颗粒丰度以及典型冷冻ET工作流程中的低通量严重限制了可获得的结构信息。为了帮助减轻这些限制,在这里,我们应用压缩感知方法,使用三维二阶全变分(CS-TV 2)断层重建。我们发现CS-TV 2增加了断层图像的信噪比,增强了大分子的直接可视化,同时保留了高分辨率的信息,直到二级结构水平。我们表明,特别是小数据集,CS-TV 2允许STA地图的分辨率的提高。我们进一步证明了CS-TV 2算法适用于细胞标本,从而提高了断层图像中分子细节的可见性。这项工作突出了基于压缩传感的重建算法在冷冻ET和原位结构生物学中的潜力。压缩感知(CS-TV 2)用于冷冻ET,使用3D二阶全变差CS-TV 2增加信号对比度,同时保留高分辨率信息改进了小数据集CS-TV 2重建的子断层图像平均值增加了细胞标本CS-TV 2重建的对比度和细节。将利用3D二阶全变分的压缩感测(CS-TV 2)重建算法应用于冷冻ET数据。该方法以纯化的细胞生物标本为基准,表明CS-TV 2增加了断层图像内的对比度,同时保留了高达二级结构水平的高分辨率信息。
Cryoelectron tomography (cryo-ET) and subtomogram averaging (STA) allow direct visualization and structural studies of biological macromolecules in their native cellular environment, in situ. Often, low signal-to-noise ratios in tomograms, low particle abundance within the cell, and low throughput in typical cryo-ET workflows severely limit the obtainable structural information. To help mitigate these limitations, here we apply a compressed sensing approach using 3D second-order total variation (CS-TV2) to tomographic reconstruction. We show that CS-TV2 increases the signal-to-noise ratio in tomograms, enhancing direct visualization of macromolecules, while preserving high-resolution information up to the secondary structure level. We show that, particularly with small datasets, CS-TV2 allows improvement of the resolution of STA maps. We further demonstrate that the CS-TV2 algorithm is applicable to cellular specimens, leading to increased visibility of molecular detail within tomograms. This work highlights the potential of compressed sensing-based reconstruction algorithms for cryo-ET and in situ structural biology. Compressed sensing (CS-TV2) for cryo-ET using 3D second-order total variation CS-TV2 increases signal contrast while retaining high-resolution information Improved subtomogram averaging from CS-TV2 reconstructions of small datasets Increased contrast and detail in CS-TV2 reconstructions of cellular specimens Böhning et al. apply a compressed sensing (CS-TV2) reconstruction algorithm utilizing 3D second-order total variation to cryo-ET data. The approach is benchmarked on purified and cellular biological specimens, showing that CS-TV2 increases contrast within tomograms while retaining high-resolution information up to the secondary structure level.
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发表时间: 1984-01-01
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