- EMDB-26206: The 3D structure and in situ arrangements (Forward slash) of CatS... -
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Basic information
Entry
Database: EMDB / ID: EMD-26206
Title
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
Map data
Sample
Organelle or cellular component: sperm flagella from efcab9 mutant mouse
Biological species
Mus musculus (house mouse)
Method
subtomogram averaging / cryo EM / Resolution: 21.7 Å
National Institutes of Health/Eunice Kennedy Shriver National Institute of Child Health & Human Development (NIH/NICHD)
R01HD096745
United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R01GM083122
United States
Cancer Prevention and Research Institute of Texas (CPRIT)
RR140082
United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R01GM111802
United States
Department of Energy (DOE, United States)
DE-AC02-O5CH11231
United States
German Research Foundation (DFG)
2344/9-3
Germany
Citation
Journal: Nat Commun / Year: 2022 Title: 3D structure and in situ arrangements of CatSper channel in the sperm flagellum. 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 ...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 / 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.
Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 1.75 e/Å2
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
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Image processing
Extraction
Number tomograms: 19 / Number images used: 268
Final angle assignment
Type: OTHER
Final reconstruction
Applied symmetry - Point group: C2 (2 fold cyclic) / Algorithm: BACK PROJECTION / Resolution.type: BY AUTHOR / Resolution: 21.7 Å / Resolution method: OTHER Details: Gold standard but resolution was reported at two cut-offs: 21.7 (0.143), 32.1 (0.5). Number subtomograms used: 536
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