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-Structure paper
タイトル | Cryo-electron tomography of eel sperm flagella reveals a molecular "minimum system" for motile cilia. |
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ジャーナル・号・ページ | Mol Biol Cell, Vol. 36, Issue 2, Page ar15, Year 2025 |
掲載日 | 2025年2月1日 |
![]() | Jason R Schrad / Gang Fu / Whitney E Hable / Alexandra M Tayar / Kenneth Oliveira / Daniela Nicastro / ![]() |
PubMed 要旨 | Cilia and flagella play a crucial role in the development and function of eukaryotes. The activity of thousands of dyneins is precisely regulated to generate flagellar motility. The complex proteome ...Cilia and flagella play a crucial role in the development and function of eukaryotes. The activity of thousands of dyneins is precisely regulated to generate flagellar motility. The complex proteome (600+ proteins) and architecture of the structural core of flagella, the axoneme, have made it challenging to dissect the functions of the different complexes, like the regulatory machinery. Previous reports suggested that the flagellum of American eel sperm lacks many of the canonical axonemal complexes yet is still motile. Here, we use cryo-electron tomography for molecular characterization of this proposed "minimal" motile flagellum. We observed different diameters for the eel sperm flagellum: narrow at the base and wider toward the flagellar tip. Subtomogram averaging revealed the three-dimensional (3D) structure of the eel sperm flagellum. As expected, major complexes were missing, for example, outer dynein arms, radial spokes, and the central pair complex, but we found molecular remnants of most complexes. We also identified bend direction-specific patterns in the inter-DMT distance in actively beating eel sperm flagella and we propose a model for the regulation of dynein activity during their motility. Together, our results shed light on the structure and function of the eel sperm flagellum and provide insight into the minimum requirements for ciliary beating. |
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手法 | EM (サブトモグラム平均) |
解像度 | 20.0 - 23.0 Å |
構造データ | ![]() EMDB-45870: Ciliary 96-nm repeat unit from active and EHNA-inhibited sperm cells of the American eel (Anguilla rostrata) ![]() EMDB-45871: Ciliary 96-nm repeat unit from active sperm cells of the American eel (Anguilla rostrata) ![]() EMDB-45872: Ciliary 96-nm repeat unit from EHNA-inhibited sperm cells of the American eel (Anguilla rostrata) |
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