In situ ultrastructures of two evolutionarily distant apicomplexan rhoptry secretion systems.
In situ ultrastructures of two evolutionarily distant apicomplexan rhoptry secretion systems.
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两种进化远处的Apicomplexan Rhoptry分泌系统的原位超微结构。
DOI:
10.1038/s41467-021-25309-9
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发表时间:
2021-08-17
影响因子:
16.6
通讯作者:
Chang YW
中科院分区:
文献类型:
--
作者:
Mageswaran SK;Guérin A;Theveny LM;Chen WD;Martinez M;Lebrun M;Striepen B;Chang YW
Parasites of the phylum Apicomplexa cause important diseases including malaria, cryptosporidiosis and toxoplasmosis. These intracellular pathogens inject the contents of an essential organelle, the rhoptry, into host cells to facilitate invasion and infection. However, the structure and mechanism of this eukaryotic secretion system remain elusive. Here, using cryo-electron tomography and subtomogram averaging, we report the conserved architecture of the rhoptry secretion system in the invasive stages of two evolutionarily distant apicomplexans, Cryptosporidium parvum and Toxoplasma gondii. In both species, we identify helical filaments, which appear to shape and compartmentalize the rhoptries, and an apical vesicle (AV), which facilitates docking of the rhoptry tip at the parasite’s apical region with the help of an elaborate ultrastructure named the rhoptry secretory apparatus (RSA); the RSA anchors the AV at the parasite plasma membrane. Depletion of T. gondii Nd9, a protein required for rhoptry secretion, disrupts the RSA ultrastructure and AV-anchoring. Moreover, T. gondii contains a line of AV-like vesicles, which interact with a pair of microtubules and accumulate towards the AV, leading to a working model for AV-reloading and discharging of multiple rhoptries. Together, our analyses provide an ultrastructural framework to understand how these important parasites deliver effectors into host cells. The rhoptry is an apical secretory organelle of apicomplexan parasites that is essential for host cell invasion. Here, Mageswaran et al. provide in situ ultrastructures of rhoptries from two pathogens, revealing a conserved architecture including luminal filaments and a distinct docking mechanism.
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影响因子:
10.5
作者:
Blader IJ;Coleman BI;Chen CT;Gubbels MJ
通讯作者:
Gubbels MJ
影响因子:
4.8
作者:
Bradley, PJ;Ward, C;Boothroyd, JC
通讯作者:
Boothroyd, JC
影响因子:
1.3
作者:
BARTA, JR;BOULARD, Y;DESSER, SS
通讯作者:
DESSER, SS
DOI:
10.1083/jcb.69.1.126
发表时间:
1976-04
期刊:
The Journal of cell biology
影响因子:
--
作者:
Beisson J;Lefort-Tran M;Pouphile M;Rossignol M;Satir B
通讯作者:
Satir B
影响因子:
4.5
作者:
Froissard, M;Keller, AM;Cohen, J
通讯作者:
Cohen, J