- EMDB-19648: Tomogram of the nuclear periphery of a follicle cell from lift-ou... -
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基本情報
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データベース: EMDB / ID: EMD-19648
タイトル
Tomogram of the nuclear periphery of a follicle cell from lift-out experiments on D. melanogaster egg chambers
マップデータ
Tomographic reconstruction of the nuclear periphery of a follicle cell from intact D. melanogaster egg chambers showing copia VLPs outside and inside the nucleus
ジャーナル: Cell / 年: 2025 タイトル: In-cell structure and snapshots of copia retrotransposons in intact tissue by cryo-ET. 著者: Sven Klumpe / Kirsten A Senti / Florian Beck / Jenny Sachweh / Bernhard Hampoelz / Paolo Ronchi / Viola Oorschot / Marlene Brandstetter / Assa Yeroslaviz / John A G Briggs / Julius Brennecke ...著者: Sven Klumpe / Kirsten A Senti / Florian Beck / Jenny Sachweh / Bernhard Hampoelz / Paolo Ronchi / Viola Oorschot / Marlene Brandstetter / Assa Yeroslaviz / John A G Briggs / Julius Brennecke / Martin Beck / Jürgen M Plitzko / 要旨: Long terminal repeat (LTR) retrotransposons belong to the transposable elements (TEs), autonomously replicating genetic elements that integrate into the host's genome. Among animals, Drosophila ...Long terminal repeat (LTR) retrotransposons belong to the transposable elements (TEs), autonomously replicating genetic elements that integrate into the host's genome. Among animals, Drosophila melanogaster serves as an important model organism for TE research and contains several LTR retrotransposons, including the Ty1-copia family, which is evolutionarily related to retroviruses and forms virus-like particles (VLPs). In this study, we use cryo-focused ion beam (FIB) milling and lift-out approaches to visualize copia VLPs in ovarian cells and intact egg chambers, resolving the in situ copia capsid structure to 7.7 Å resolution by cryoelectron tomography (cryo-ET). Although cytoplasmic copia VLPs vary in size, nuclear VLPs are homogeneous and form densely packed clusters, supporting a model in which nuclear import acts as a size selector. Analyzing flies deficient in the TE-suppressing PIWI-interacting RNA (piRNA) pathway, we observe copia's translocation into the nucleus during spermatogenesis. Our findings provide insights into the replication cycle and cellular structural biology of an active LTR retrotransposon.
ダウンロード / ファイル: emd_19648.map.gz / 形式: CCP4 / 大きさ: 2 GB / タイプ: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
注釈
Tomographic reconstruction of the nuclear periphery of a follicle cell from intact D. melanogaster egg chambers showing copia VLPs outside and inside the nucleus
集束イオンビーム - 装置: OTHER / 集束イオンビーム - イオン: OTHER / 集束イオンビーム - 電圧: 30 / 集束イオンビーム - 電流: 0.1 / 集束イオンビーム - 時間: 100 / 集束イオンビーム - 温度: 93 K / 集束イオンビーム - Initial thickness: 5000 / 集束イオンビーム - 最終 厚さ: 150 集束イオンビーム - 詳細: The value given for _em_focused_ion_beam.instrument is FEI Aquilos 1. This is not in a list of allowed values {'OTHER', 'DB235'} so OTHER is written into the XML file.
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電子顕微鏡法
顕微鏡
FEI TITAN KRIOS
撮影
フィルム・検出器のモデル: FEI FALCON IV (4k x 4k) 平均電子線量: 3.0 e/Å2