Swiss State Secretariat for Education, Research and Innovation
MB22.00075
スイス
引用
ジャーナル: PLoS Biol / 年: 2025 タイトル: The luminal ring protein C2CD3 acts as a radial in-to-out organizer of the distal centriole and appendages. 著者: Eloïse Bertiaux / Vincent Louvel / Caitlyn L McCafferty / Hugo van den Hoek / Umut Batman / Souradip Mukherjee / Lorène Bournonville / Olivier Mercey / Isabelle Méan / Ricardo D Righetto / ...著者: Eloïse Bertiaux / Vincent Louvel / Caitlyn L McCafferty / Hugo van den Hoek / Umut Batman / Souradip Mukherjee / Lorène Bournonville / Olivier Mercey / Isabelle Méan / Ricardo D Righetto / Adrian Müller / Philippe Van der Stappen / Garrison Buss / Jean Daraspe / Christel Genoud / Tim Stearns / Benjamin D Engel / Virginie Hamel / Paul Guichard / 要旨: Centrioles are polarized microtubule-based structures with appendages at their distal end that are essential for cilia formation and function. The protein C2CD3 is critical for distal appendage ...Centrioles are polarized microtubule-based structures with appendages at their distal end that are essential for cilia formation and function. The protein C2CD3 is critical for distal appendage assembly, with mutations linked to orofaciodigital syndrome and other ciliopathies. However, its precise molecular role in appendage recruitment remains unclear. Using ultrastructure expansion microscopy (U-ExM) and iterative U-ExM on human cells, together with in situ cryo-electron tomography (cryo-ET) on mouse tissues, we reveal that C2CD3 adopts a radially symmetric 9-fold organization within the centriole's distal lumen. We show that the C-terminal region of C2CD3 localizes close to a ~100 nm luminal ring structure consisting of ~27 nodes, while its N-terminal region localizes close to a hook-like structure that attaches to the A-microtubule as it extends from the centriole interior to exterior. This hook structure is adjacent to the DISCO complex (MNR/CEP90/OFD1), which marks future appendage sites. C2CD3 depletion disrupts not only the recruitment of the DISCO complex via direct interaction with MNR but also destabilizes the luminal ring network composed of C2CD3/SFI1/centrin-2/CEP135/NA14, as well as the distal microtubule tip protein CEP162. This reveals an intricate "in-to-out" molecular hub connecting the centriolar lumen, distal microtubule cap, and appendages. Although C2CD3 loss results in shorter centrioles and appendage defects, key structural elements remain intact, permitting continued centriole duplication. We propose that C2CD3 forms the luminal ring structure and extends radially to the space between triplet microtubules, functioning as an architectural hub that scaffolds the distal end of the centriole, orchestrating its assembly and directing appendage formation.
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 {'EMS-002 RAPID IMMERSION FREEZER', 'LEICA EM PACT', 'LEICA EM PACT2', ...詳細: The value given for _em_high_pressure_freezing.instrument is Leica EM Ice. This is not in a list of allowed values {'EMS-002 RAPID IMMERSION FREEZER', 'LEICA EM PACT', 'LEICA EM PACT2', 'OTHER', 'BAL-TEC HPM 010', 'LEICA EM HPM100'} so OTHER is written into the XML file.
Cryo protectant
20% dextran
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: 2700 / 集束イオンビーム - 温度: 81 K / 集束イオンビーム - Initial thickness: 4000 / 集束イオンビーム - 最終 厚さ: 150 集束イオンビーム - 詳細: Serialized Lift-Out procedure.. The value given for _em_focused_ion_beam.instrument is Thermo Scientific Aquilos 2 cryo-FIB-SEM. This is not in a list of allowed ...集束イオンビーム - 詳細: Serialized Lift-Out procedure.. The value given for _em_focused_ion_beam.instrument is Thermo Scientific Aquilos 2 cryo-FIB-SEM. 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
TFS 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