- EMDB-19646: Tomographic reconstruction of the follicle cell nuclear periphery... -
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基本情報
登録情報
データベース: EMDB / ID: EMD-19646
タイトル
Tomographic reconstruction of the follicle cell nuclear periphery from high pressure frozen, freeze substituted and resin embedded D. melanogaster egg chamber
マップデータ
Reconstructed tomogram
試料
組織: D. melanogaster egg chamber from tj>Sec31::RFP flies
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.
A: 24985.6 Å / B: 24985.6 Å / C: 2476.5999 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 : D. melanogaster egg chamber from tj>Sec31::RFP flies
全体
名称: D. melanogaster egg chamber from tj>Sec31::RFP flies
要素
組織: D. melanogaster egg chamber from tj>Sec31::RFP flies
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超分子 #1: D. melanogaster egg chamber from tj>Sec31::RFP flies
超分子
名称: D. melanogaster egg chamber from tj>Sec31::RFP flies タイプ: tissue / ID: 1 / 親要素: 0 詳細: Females from F1 scored against CyO from following genotypes: traffic jam-GAL4/CyO;; and w* P{UAS-Sec31.RFP}13.5; snaSco/CyO, P{ftz-lacB}E3 (Bloomington #86533);
装置: OTHER 詳細: The value given for _em_high_pressure_freezing.instrument is HPM 010. This is not in a list of allowed values {'EMS-002 RAPID IMMERSION FREEZER', 'BAL-TEC HPM 010', 'OTHER', 'LEICA EM ...詳細: The value given for _em_high_pressure_freezing.instrument is HPM 010. This is not in a list of allowed values {'EMS-002 RAPID IMMERSION FREEZER', 'BAL-TEC HPM 010', 'OTHER', 'LEICA EM HPM100', 'LEICA EM PACT2', 'LEICA EM PACT'} so OTHER is written into the XML file.
Cryo protectant
20% Ficoll 70 kDa
切片作成
ウルトラミクロトーム - 装置: Leica EM UC7 / ウルトラミクロトーム - 温度: 293 K / ウルトラミクロトーム - 最終 厚さ: 300
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電子顕微鏡法
顕微鏡
FEI TECNAI F30
撮影
フィルム・検出器のモデル: OTHER / 平均電子線量: 10.0 e/Å2 / 詳細: Gatan OneView