National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
GM118106
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
GM118099
米国
The Pew Charitable Trusts
Pew Biomedical Scholar Award
米国
引用
ジャーナル: Nat Struct Mol Biol / 年: 2023 タイトル: In situ cryo-electron tomography reveals the asymmetric architecture of mammalian sperm axonemes. 著者: Zhen Chen / Garrett A Greenan / Momoko Shiozaki / Yanxin Liu / Will M Skinner / Xiaowei Zhao / Shumei Zhao / Rui Yan / Zhiheng Yu / Polina V Lishko / David A Agard / Ronald D Vale / 要旨: The flagella of mammalian sperm display non-planar, asymmetric beating, in contrast to the planar, symmetric beating of flagella from sea urchin sperm and unicellular organisms. The molecular basis ...The flagella of mammalian sperm display non-planar, asymmetric beating, in contrast to the planar, symmetric beating of flagella from sea urchin sperm and unicellular organisms. The molecular basis of this difference is unclear. Here, we perform in situ cryo-electron tomography of mouse and human sperm, providing the highest-resolution structural information to date. Our subtomogram averages reveal mammalian sperm-specific protein complexes within the microtubules, the radial spokes and nexin-dynein regulatory complexes. The locations and structures of these complexes suggest potential roles in enhancing the mechanical strength of mammalian sperm axonemes and regulating dynein-based axonemal bending. Intriguingly, we find that each of the nine outer microtubule doublets is decorated with a distinct combination of sperm-specific complexes. We propose that this asymmetric distribution of proteins differentially regulates the sliding of each microtubule doublet and may underlie the asymmetric beating of mammalian sperm.