- EMDB-18124: A cryo-ET study of ciliary rootlet organization - purified rootle... -
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基本情報
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データベース: EMDB / ID: EMD-18124
タイトル
A cryo-ET study of ciliary rootlet organization - purified rootlet example 3
マップデータ
purified rootlet, eman2 preprocessed cropped tomogram for segmentation. Object files are found on biostudies (S-BSST1164, https://www.ebi.ac.uk/biostudies/studies/S-BSST1164)
試料
細胞器官・細胞要素: Ciliary rootlet surrounded by cellular membranes
ジャーナル: Elife / 年: 2024 タイトル: A cryo-electron tomography study of ciliary rootlet organization. 著者: Chris van Hoorn / Andrew P Carter / 要旨: Ciliary rootlets are striated bundles of filaments that connect the base of cilia to internal cellular structures. Rootlets are critical for the sensory and motile functions of cilia. However, the ...Ciliary rootlets are striated bundles of filaments that connect the base of cilia to internal cellular structures. Rootlets are critical for the sensory and motile functions of cilia. However, the mechanisms underlying these functions remain unknown, in part due to a lack of structural information of rootlet organization. In this study, we obtain 3D reconstructions of membrane-associated and purified rootlets from mouse retina using cryo-electron tomography. We show that flexible protrusions on the rootlet surface, which emanate from the cross-striations, connect to intracellular membranes. In purified rootlets, the striations were classified into amorphous (A)-bands, associated with accumulations on the rootlet surface, and discrete (D)-bands corresponding to punctate lines of density that run through the rootlet. These striations connect a flexible network of longitudinal filaments. Subtomogram averaging suggests the filaments consist of two intertwined coiled coils. The rootlet's filamentous architecture, with frequent membrane-connecting cross-striations, lends itself well for anchoring large membranes in the cell.
ダウンロード / ファイル: emd_18124.map.gz / 形式: CCP4 / 大きさ: 73.1 MB / タイプ: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
注釈
purified rootlet, eman2 preprocessed cropped tomogram for segmentation. Object files are found on biostudies (S-BSST1164, https://www.ebi.ac.uk/biostudies/studies/S-BSST1164)
A: 4619.264 Å / B: 5329.92 Å / C: 1065.984 Å α=β=γ: 90.0 °
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添付データ
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試料の構成要素
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全体 : Ciliary rootlet surrounded by cellular membranes
全体
名称: Ciliary rootlet surrounded by cellular membranes
要素
細胞器官・細胞要素: Ciliary rootlet surrounded by cellular membranes
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超分子 #1: Ciliary rootlet surrounded by cellular membranes
超分子
名称: Ciliary rootlet surrounded by cellular membranes / タイプ: organelle_or_cellular_component / ID: 1 / 親要素: 0 詳細: The sample was purified according to https://doi.org/10.1016/j.cell.2012.10.038, maintaining cellular interactions with the rootlet.
For tomogram segmentation, tomograms were reconstructed as even/odd frame half tomograms using the above mentioned WARP pipeline and denoised using Noise2Map(Tegunov & Cramer, 2018). The tomograms were then deconvolved and isotropically reconstructed with denoising using IsoNet(Liu et al, 2021) with a cube size of 128 pixels. The tomograms were then preprocessed in EMAN2.2 for training of the TomoSeg CNN(Chen et al, 2017).