ジャーナル: Nat Plants / 年: 2026 タイトル: In situ architecture of plasmodesmata in Physcomitrium patens resolved by cryo-electron tomography. 著者: Marcel Dickmanns / Matthias Pöge / Peng Xu / Sven Gombos / Zoe K Barr / Manuel Miras / Jürgen M Plitzko / Rüdiger Simon / Waltraud X Schulze / Wolf B Frommer / Wolfgang Baumeister / 要旨: Plasmodesmata are nanoscopic channels that traverse plant cell walls, enabling direct intercellular exchange through membrane and cytosolic continuity. Although numerous plasmodesmal components have ...Plasmodesmata are nanoscopic channels that traverse plant cell walls, enabling direct intercellular exchange through membrane and cytosolic continuity. Although numerous plasmodesmal components have been identified, their molecular organization remains poorly defined. Here we used cryo-electron tomography to resolve the in situ architecture of plasmodesmata in Physcomitrium patens across tissues and physiological states. We show how callose-related cell wall remodelling shapes pore architecture to modulate permeability, including a previously undescribed fully sealed state, and resolve helical protein assemblies scaffolding the central, endoplasmic-reticulum-derived desmotubule. Candidate screening via proteomics and structure prediction indicates Multiple C2 Domain and Transmembrane Proteins (MCTPs) as key constituents of these assemblies. In this model, MCTPs tether the desmotubule to the plasma membrane, while their disordered linker regions with polyampholyte charge patterning may populate the cytosolic sleeve. These findings define core architectural features of plasmodesmata and provide a structural framework for understanding how membrane, protein and cell wall components coordinate intercellular connectivity in plants.
名称: UBQ:GHL17_1 Physcomitrium patens protonemal tissue / タイプ: tissue / ID: 1 / 親要素: 0 詳細: Lamellae prepared from high-pressure frozen tissue by cryo-FIB milling. Cryo-electron tomogram reconstructed at bin4 and denoised using cryoCARE.
由来(天然)
生物種: Physcomitrium patens (植物) / 組織: Protonema
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実験情報
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構造解析
手法
クライオ電子顕微鏡法
解析
電子線トモグラフィー法
試料の集合状態
tissue
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試料調製
緩衝液
pH: 5.8
凍結
凍結剤: NITROGEN
加圧凍結法
装置: OTHER 詳細: The value given for _em_high_pressure_freezing.instrument is Leica EM ICE. This is not in a list of allowed values {'BAL-TEC HPM 010', 'LEICA EM PACT2', 'OTHER', 'EMS-002 RAPID IMMERSION ...詳細: The value given for _em_high_pressure_freezing.instrument is Leica EM ICE. This is not in a list of allowed values {'BAL-TEC HPM 010', 'LEICA EM PACT2', 'OTHER', 'EMS-002 RAPID IMMERSION FREEZER', 'LEICA EM PACT', 'LEICA EM HPM100'} so OTHER is written into the XML file.
切片作成
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: 0.05 / 集束イオンビーム - 時間: 3600 / 集束イオンビーム - 温度: 93 K / 集束イオンビーム - Initial thickness: 25000 / 集束イオンビーム - 最終 厚さ: 200 集束イオンビーム - 詳細: The value given for _em_focused_ion_beam.instrument is Aquilos. This is not in a list of allowed values {'DB235', 'OTHER'} so OTHER is written into the XML file.
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電子顕微鏡法
顕微鏡
TFS KRIOS
撮影
フィルム・検出器のモデル: GATAN K2 SUMMIT (4k x 4k) 平均電子線量: 100.0 e/Å2