Dataset Information

Conoid extrusion serves as gatekeeper for entry of glideosome components into the pellicular space to control motility and invasion in Apicomplexa

ABSTRACT: Members of the apicomplexans are defined by apical cytoskeletal structures and secretory or-ganelles, tailored for motility and invasion. Gliding is powered by the actomyosin-dependent rearward translocation of apically secreted transmembrane adhesins. In Toxoplasma gondii, the conoid, composed of a cone of spiraling tubulin fibers and apposed preconoidal rings (PCRs), is an enigmatic, dynamic organelle of undefined function. Here we mapped five new components of the PCRs and deduce that the structure serves as a pivotal hub for actin polymerization and glideosome assembly. F-actin produced by Formin1 on the PCRs is used by Myosin H to generate the force for conoid extrusion. A set of conserved B-box-type zinc finger domain containing proteins in Apicomplexa is indispensable for PCRs formation, co-noid extrusion and motility in Toxoplasma and Plasmodium. Conoid dynamics directs the flux of F-actin to the pellicular space, acting as dynamic gatekeeper to tightly control parasite motility during invasion and egress.

INSTRUMENT(S): LTQ Orbitrap Velos

ORGANISM(S): Toxoplasma Gondii Gt1

SUBMITTER: Oscar Vadas

LAB HEAD: Oscar Vadas

PROVIDER: PXD031816 | Pride | 2023-08-31

REPOSITORIES: Pride

ACCESS DATA

Publications

Conoid extrusion regulates glideosome assembly to control motility and invasion in Apicomplexa.

Dos Santos Pacheco Nicolas N Brusini Lorenzo L Haase Romuald R Tosetti Nicolò N Maco Bohumil B Brochet Mathieu M Vadas Oscar O Soldati-Favre Dominique D

Nature microbiology 20220915 11

Members of Apicomplexa are defined by apical cytoskeletal structures and secretory organelles, tailored for motility, invasion and egress. Gliding is powered by actomyosin-dependent rearward translocation of apically secreted transmembrane adhesins. In the human parasite Toxoplasma gondii, the conoid, composed of tubulin fibres and preconoidal rings (PCRs), is a dynamic organelle of undefined function. Here, using ultrastructure expansion microscopy, we established that PCRs serve as a hub for g ...[more]

PMID: 36109645

Similar Datasets

Project description:Toxoplasma gondii is a globally distributed obligate intracellular parasite which can cause zoonotic toxoplasmosis with great harms. The average death time of mice that infected with Toxoplasma gondii RH strain tachyzoites recovered from the liquid nitrogen was shortened after multiple generations. It has been reported that the parasite is in a state of static virulence during cryopreservation and the virulence of the protozoan parasite can be enhanced after continuous passages in hosts under laboratory conditions. However, no research has been conducted to elucidate its biological mechanism. Herein, we sequenced the T. gondii transcriptome using RNA-Seq technology and performed de novo assembly to investigated the virulence factors expression changes by comparing gene expression profiles between incipiently recovered and completely resuscitated tachyzoites. Transcriptome analysis identified 1,951 differentially expressed transcripts in infected liver, of which 1,752 were significantly downregulated and 199 upregulated. We identified many differentially expressed proteins and genes, including serine/threonine kinase, calnexin, myosin and microtubule-associated protein which have previously been reported to be either involved in cell adhesion, parasite gliding or participate in cell invasion. The great majority of the virulence factors including microneme proteins, rhoptry proteins and dense granule proteins were upregulated in fully recovered tachyzoites. The enhanced virulence of recovered Toxoplasma gondii RH strain from the liquid nitrogen is associated with the up-regulated expression of MICs, ROPs and GRAs. Our data will facilitate future genomic research and in-depth annotation of Toxoplasma gondii RH strain genomes. This study provides a profile of the candidate genes that are suspected to be involved with virulence enhancement of recovered Toxoplasma gondii RH strain tachyzoites. Many further studies should be carried out to confirm the function of the candidate genes. Moreover, the preliminary identification of genes and pathways exhibiting differential expression in complete resuscitation stage may further our general understanding of virulence enhancement in this parasite.

Dataset Information

Conoid extrusion serves as gatekeeper for entry of glideosome components into the pellicular space to control motility and invasion in Apicomplexa

Publications

Conoid extrusion regulates glideosome assembly to control motility and invasion in Apicomplexa.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure