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-Structure paper
Title | 3D structure and in situ arrangements of CatSper channel in the sperm flagellum. |
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Journal, issue, pages | Nat Commun, Vol. 13, Issue 1, Page 3439, Year 2022 |
Publish date | Jun 17, 2022 |
Authors | Yanhe Zhao / Huafeng Wang / Caroline Wiesehoefer / Naman B Shah / Evan Reetz / Jae Yeon Hwang / Xiaofang Huang / Tse-En Wang / Polina V Lishko / Karen M Davies / Gunther Wennemuth / Daniela Nicastro / Jean-Ju Chung / |
PubMed Abstract | The sperm calcium channel CatSper plays a central role in successful fertilization as a primary Ca gateway. Here, we applied cryo-electron tomography to visualize the higher-order organization of the ...The sperm calcium channel CatSper plays a central role in successful fertilization as a primary Ca gateway. Here, we applied cryo-electron tomography to visualize the higher-order organization of the native CatSper complex in intact mammalian sperm. The repeating CatSper units form long zigzag-rows along mouse and human sperm flagella. Above each tetrameric channel pore, most of the extracellular domains form a canopy that interconnects to a zigzag-shaped roof. Murine CatSper contains an additional wing-structure connected to the tetrameric channel. The intracellular domains link two neighboring channels to a diagonal array, suggesting a dimer formation. Fitting of an atomic model of isolated monomeric CatSper to the in situ map reveals supramolecular interactions and assembly of the CatSper complex. Loss of EFCAB9-CATSPERζ alters the architecture and interactions of the channels, resulting in fragmentation and misalignment of the zigzag-rows and disruption of flagellar movement in Efcab9 sperm. This work offers unique insights into the structural basis for understanding CatSper regulation of sperm motility. |
External links | Nat Commun / PubMed:35715406 / PubMed Central |
Methods | EM (subtomogram averaging) |
Resolution | 16.8 - 21.7 Å |
Structure data | EMDB-24210: The 3D structure and in situ arrangements of CatSper channel from the cryo-electron tomography and subtomographic average of mouse wild type sperm flagella EMDB-26206: The 3D structure and in situ arrangements (Forward slash) of CatSper channel from the cryo-electron tomography and subtomographic average of mouse efcab9 mutant sperm flagella EMDB-26207: The 3D structure and in situ arrangements (Backslash) of CatSper channel from the cryo-electron tomography and subtomographic average of mouse efcab9 mutant sperm flagella |
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