- EMDB-13881: CS-TV2-reconstructed tomogram of a C. crescentus stalk covered by... -
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基本情報
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データベース: EMDB / ID: EMD-13881
タイトル
CS-TV2-reconstructed tomogram of a C. crescentus stalk covered by an S-layer
マップデータ
CS-TV2 reconstruction of a C. crescentus stalk covered by an S-layer of RsaA hexamers. The tomogram was cropped and rotated to reduce file size. Contrast may require manual adjustment.
試料
細胞器官・細胞要素: C. crescentus stalk
キーワード
S-layer / C. crescentus / RsaA / STRUCTURAL PROTEIN
ジャーナル: Structure / 年: 2022 タイトル: Compressed sensing for electron cryotomography and high-resolution subtomogram averaging of biological specimens. 著者: Jan Böhning / Tanmay A M Bharat / Sean M Collins / 要旨: 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, ...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-TV) to tomographic reconstruction. We show that CS-TV 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-TV allows improvement of the resolution of STA maps. We further demonstrate that the CS-TV 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.
ダウンロード / ファイル: emd_13881.map.gz / 形式: CCP4 / 大きさ: 976 MB / タイプ: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
注釈
CS-TV2 reconstruction of a C. crescentus stalk covered by an S-layer of RsaA hexamers. The tomogram was cropped and rotated to reduce file size. Contrast may require manual adjustment.