National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)
R01AI147131
米国
Other private
Hirschl Career Scientist Award
The Pew Charitable Trusts
PEW-00033055
米国
Other government
NIH Common Fund Transformative High Resolution Cryo-Electron Microscopy, U24 GM129539
Simons Foundation
SF349247
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
9 P41 GM103310
米国
引用
ジャーナル: bioRxiv / 年: 2024 タイトル: Cryo-ET reveals the architecture of the polar tube invasion apparatus from microsporidian parasites. 著者: Mahrukh Usmani / Nicolas Coudray / Margot Riggi / Rishwanth Raghu / Harshita Ramchandani / Daija Bobe / Mykhailo Kopylov / Ellen D Zhong / Janet H Iwasa / Damian C Ekiert / Gira Bhabha 要旨: Microsporidia are divergent fungal pathogens that employ a harpoon-like apparatus called the polar tube (PT) to invade host cells. The PT architecture and its association with neighboring organelles ...Microsporidia are divergent fungal pathogens that employ a harpoon-like apparatus called the polar tube (PT) to invade host cells. The PT architecture and its association with neighboring organelles remain poorly understood. Here, we use cryo-electron tomography to investigate the structural cell biology of the PT in dormant spores from the human-infecting microsporidian species, . Segmentation and subtomogram averaging of the PT reveal at least four layers: two protein-based layers surrounded by a membrane, and filled with a dense core. Regularly spaced protein filaments form the structural skeleton of the PT. Combining cryo-electron tomography with cellular modeling, we propose a model for the 3-dimensional organization of the polaroplast, an organelle that is continuous with the membrane layer that envelops the PT. Our results reveal the ultrastructure of the microsporidian invasion apparatus , laying the foundation for understanding infection mechanisms.