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0This research identifies how the parasite Toxoplasma gondii interacts with host cells by establishing membrane contact sites (MCS) with the endoplasmic reticulum (ER). Using a specialized fluorescence sensor and CRISPR-based screening, scientists discovered that the parasite protein TgROP1 acts as a physical tether to the host cell. Specifically, TgROP1 mimics a biological motif to bind with host proteins VAPA and VAPB, facilitating communication between the pathogen and the host organelle. The study demonstrates that these connections are vital for the parasite, as removing these host proteins significantly hinders pathogen growth. Furthermore, the findings suggest a competitive relationship between different organelle contacts, as ER interactions appear to limit the parasite's contact with mitochondria. Ultimately, this work reveals a sophisticated strategy where pathogens hijack host tethering mechanisms to thrive during an infection.
References:
Mehra C, Alvarado Valverde J, Matias A M N, et al. Toxoplasma effector TgROP1 establishes membrane contact sites with the endoplasmic reticulum during infection[J]. Nature microbiology, 2025, 10(12): 3331-3345.
