9IJJ

In situ structure of the central apparatus in mouse sperm axoneme.

This is a non-PDB format compatible entry.

Summary for 9IJJ

• Entry DOI: 10.2210/pdb9ijj/pdb
• EMDB information: 60633
• Descriptor: Spermatogenesis-associated protein 4, Coiled-coil domain containing 180, Cilia- and flagella-associated protein 54, ... (45 entities in total)
• Functional Keywords: microtubules, axoneme, sperm, filament, protein transport
• Biological source: Mus musculus (house mouse); More
• Total number of polymer chains: 464
• Total formula weight: 28871568.75

Authors

Zhu, Y.,Yin, G.,Sun, F. (deposition date: 2024-06-23, release date: 2025-06-04, Last modification date: 2025-09-10)

Primary citation

Zhu, Y.,Lin, T.,Yin, G.,Tai, L.,Chen, L.,Ma, J.,Huang, G.,Lu, Y.,Zhang, Z.,Wang, B.,Chen, S.,Sun, F.
In situ structure of the mouse sperm central apparatus reveals mechanistic insights into asthenozoospermia.
Cell Res., 35:551-567, 2025

PubMed Abstract: The central apparatus (CA) within the sperm axoneme is vital for sperm motility, yet its molecular architecture and functional mechanisms remain incompletely understood. Combining cryo-electron tomography and AlphaFold2, we resolved the in-cell structure of mouse sperm CA at a subnanometer resolution and built a near-complete atomic model. Our analysis identified 39 CA-associated proteins, including eight previously unreported components. By presenting the full-length structures of CFAP47 and HYDIN, we elucidate their molecular roles in tethering the C1 and C2 microtubules within the CA. Specifically, HYDIN forms a semicircular chain that encircles C1 and C2, with its N-terminal half driving the C1-C2 connection and its C-terminal half providing axial support in C2. CFAP47, the core structural component of the bridge, binds C1 through its N-terminal domains, interacts with HYDIN via its central CFAP47-ring, and anchors to C2 through its C-terminal region. The significantly reduced sperm motility and impaired CA structure observed in Cfap47-knockout mice confirmed the important role of CFAP47. Furthermore, genetic analysis of infertile Chinese men with asthenozoospermia identified previously unreported mutations in the CFAP47. The CA structural model elucidates the pathogenic mechanisms of these mutations, establishing a direct link between CFAP47 dysfunction and impaired sperm motility. Therefore, our study provides mechanistic insights into CA-related fertility disorders.

PubMed: 40473901
DOI: 10.1038/s41422-025-01135-2

Experimental method

ELECTRON MICROSCOPY (7.7 Å)