8to0
48-nm repeating structure of doublets from mouse sperm flagella48-nm repeating structure of doublets from mouse sperm flagella
Structural highlights
FunctionCFA95_MOUSE Microtubule inner protein (MIP) part of the dynein-decorated doublet microtubules (DMTs) in cilia axoneme, which is required for motile cilia beating.[UniProtKB:Q32L77] Publication Abstract from PubMedTo understand the molecular mechanisms of cellular pathways, contemporary workflows typically require multiple techniques to identify proteins, track their localization, and determine their structures in vitro. Here, we combined cellular cryoelectron tomography (cryo-ET) and AlphaFold2 modeling to address these questions and understand how mammalian sperm are built in situ. Our cellular cryo-ET and subtomogram averaging provided 6.0-A reconstructions of axonemal microtubule structures. The well-resolved tertiary structures allowed us to unbiasedly match sperm-specific densities with 21,615 AlphaFold2-predicted protein models of the mouse proteome. We identified Tektin 5, CCDC105, and SPACA9 as novel microtubule-associated proteins. These proteins form an extensive interaction network crosslinking the lumen of axonemal doublet microtubules, suggesting their roles in modulating the mechanical properties of the filaments. Indeed, Tekt5 -/- sperm possess more deformed flagella with 180 degrees bends. Together, our studies presented a cellular visual proteomics workflow and shed light on the in vivo functions of Tektin 5. De novo protein identification in mammalian sperm using in situ cryoelectron tomography and AlphaFold2 docking.,Chen Z, Shiozaki M, Haas KM, Skinner WM, Zhao S, Guo C, Polacco BJ, Yu Z, Krogan NJ, Lishko PV, Kaake RM, Vale RD, Agard DA Cell. 2023 Oct 19:S0092-8674(23)01038-3. doi: 10.1016/j.cell.2023.09.017. PMID:37865089[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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