Journal
ISCIENCE
Volume 25, Issue 5, Pages -Publisher
CELL PRESS
DOI: 10.1016/j.isci.2022.104281
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Funding
- Fundacao para a Ciencia e a Tecnologia [DRIVER-LISBOA-01-0145-FEDER-030751, SFRH/BD/113750/2015, PD/BD/114036/2015, DL57/2016/CP1451/CT0010]
- `` la Caixa'' Foundation [HR17/52150010]
- Calouste Gulbenkian Foundation
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The UIS4 protein interacts with host cell actin, suppressing filamentous actin formation to avoid parasite elimination. Host cell actin dynamics increase around UIS4-deficient parasites, leading to parasite elimination.
Parasite-derived PVM-resident proteins are critical for complete parasite development inside hepatocytes, although the function of most of these proteins remains unknown. Here, we show that the upregulated in infectious sporozoites 4 (UIS4) protein, resident at the PVM, interacts with the host cell actin. By suppressing filamentous actin formation, UIS4 avoids parasite elimination. Host cell actin dynamics increases around UIS4-deficient parasites, which is associated with subsequent parasite elimination. Notably, parasite elimination is impaired significantly by the inhibition of host myosin-II, possibly through relieving the compression generated by actomyosin complexes at the host-parasite interface. Together, these data reveal that UIS4 has a critical role in the evasion of host defensive mechanisms, enabling hence EEF survival and development.
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