- EMDB-52691: Cryo-electron tomogram of the tip of Candidatus Arthromitus sp. S... -
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データベース: EMDB / ID: EMD-52691
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Cryo-electron tomogram of the tip of Candidatus Arthromitus sp. SFB-rat-Yit (intracellular offspring containing intracellular plate-like structures) grown in rats
ジャーナル: Nat Commun / 年: 2025 タイトル: Segmented filamentous bacteria undergo a structural transition at their adhesive tip during unicellular to filament development. 著者: Ana Raquel Cruz / Benedikt H Wimmer / Teck Hui Teo / Gérard Pehau-Arnaudet / Jean-Marie Winter / Anastasia D Gazi / Pierre Lafaye / Sébastien Brier / Agnès Legrand / Anna Dubrovsky-Gaupp / ...著者: Ana Raquel Cruz / Benedikt H Wimmer / Teck Hui Teo / Gérard Pehau-Arnaudet / Jean-Marie Winter / Anastasia D Gazi / Pierre Lafaye / Sébastien Brier / Agnès Legrand / Anna Dubrovsky-Gaupp / Marion Bérard / Gabriel Aymé / Anna Sartori-Rupp / Ohad Medalia / Pamela Schnupf / 要旨: Segmented filamentous bacteria (SFB) are intestinal commensals that promote immune system development and pathogen protection through intimate attachment to the ileal epithelium. Attachment occurs ...Segmented filamentous bacteria (SFB) are intestinal commensals that promote immune system development and pathogen protection through intimate attachment to the ileal epithelium. Attachment occurs via the tip of unicellular teardrop-shaped SFB, called intracellular offsprings (IOs), before outgrowth into filaments. To characterize this critical stage of the SFB life cycle, we imaged SFB using cryo-electron microscopy and tomography. IOs were surrounded by a repetitive surface (S)-layer that became replaced by disordered hair-like structures specifically at the IO tip. During outgrowth into filaments, the S-layer was exchanged for a morphologically distinct repetitive hair-like layer. The bacterial structures and morphological transition were conserved across SFB from mouse and rat origin, while growth of mouse-SFB under non-attachment conditions in a heterologous host affected the SFB tip length and relative proportion of the tip stages. Moreover, a major Th17 and B cell antigen, while being a ubiquitous cell wall-associated protein, was immunologically accessible only at the filament tip, underscoring the unique properties of the tip structure. This study identifies an IO-specific S-layer and reveals a conserved developmental transition of the SFB tip surface including the transient appearance of structures consistent in location and timing with being involved in host cell attachment.
アルゴリズム: BACK PROJECTION / ソフトウェア - 名称: IMOD (ver. 4.11.X) 詳細: SIRT-like filter also applied for the final reconstruction. Topaz denoise applied on the reconstructed tomogram using the default 10A/pixel model. 使用した粒子像数: 35