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:
影响因子:
--
通讯作者:
Collins SM
中科院分区:
文献类型:
--
作者:
Böhning J;Bharat TAM;Collins SM
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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2.3
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通讯作者:
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