Dataset Information

Toxoplsama Gondii whole proteome study

ABSTRACT: MS/MS dataset for proteogenomics study of Toxoplasma gondii. The dataset was searched against the official v9 gene model from ToxoDB, and the alternate panels of proteins predicted from RNA-SEQ evidences.

INSTRUMENT(S): LTQ Orbitrap

ORGANISM(S): Toxoplasma Gondii Rh

SUBMITTER: Ritesh Krishna

LAB HEAD: Andrew Jones

PROVIDER: PXD000297 | Pride | 2015-02-09

REPOSITORIES: Pride

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Publications

A large-scale proteogenomics study of apicomplexan pathogens-Toxoplasma gondii and Neospora caninum.

Krishna Ritesh R Xia Dong D Sanderson Sanya S Shanmugasundram Achchuthan A Vermont Sarah S Bernal Axel A Daniel-Naguib Gianluca G Ghali Fawaz F Brunk Brian P BP Roos David S DS Wastling Jonathan M JM Jones Andrew R AR

Proteomics 20150515 15

Proteomics data can supplement genome annotation efforts, for example being used to confirm gene models or correct gene annotation errors. Here, we present a large-scale proteogenomics study of two important apicomplexan pathogens: Toxoplasma gondii and Neospora caninum. We queried proteomics data against a panel of official and alternate gene models generated directly from RNASeq data, using several newly generated and some previously published MS datasets for this meta-analysis. We identified ...[more]

PMID: 25867681

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Project description:Toxoplasma gondii is an obligate intracellular protozoan of severe threat to humans and livestock. Macrophages are the cell type preferentially infected by T. gondii in vivo. Protein phosphorylation is an important post-translational modification involved in diverse cellular functions. ARAF is member of the RAF family of serine/threonine protein kinases that is necessary for MAPK activation. Limited information is available about the level of protein phosphorylation variations and the roles of ARAF in macrophages with T. gondii infection, although our previous research found that ARAF knockout could reduce the apoptosis of porcine alveolar macrophages (3D4/21 cells) caused by T. gondii infection. Here, we used IMAC in combination with LC-MS/MS to profile the changes of phosphorylation in 3D4/21 cells and 3D4/21-ΔAraf cells upon Toxoplasma infection, respectively. A total of 1647 differentially expressed phosphorylated proteins (DEPPs) with 3876 differentially phosphorylated sites (DPSs) were identified in 3D4/21 cells with Toxoplasma infection (p3T group) when comparing 3D4/21 cells without parasite infection (pho3 group), and 959 DEPPs with1540 DPSs when comparing 3D4/21-ΔAraf cells with parasite infection (p3KT group). In addition, 552 DPSs corresponding to 406 DEPPs with the same phosphorylated sites were screened in the comparison p3T/pho3 vs. p3T/p3KT, which was identified as the DPSs and DEPPs related with ARAF. Remarkable functional properties of the DEPPs were discovered by GO analysis, KEGG pathway analysis, and STRING analysis. Of 406 DEPPs related with ARAF, 40 DEPPs corresponding to 57 DPSs involved in the apoptosis of 3D4/21 cells during Toxoplasma infection. Further analysis showed that the phosphorylation levels of MED1at serine1418, JUN at serine 73, MYC at serine 154, MCL1 at serine 65, and BAD at serine115 were upregulated in p3T, but downregulated in p3KT, suggesting that ARAF regulate phosphorylation of these sites to modulate the apoptosis of macrophages induced by Toxoplasma infection. These results revealed distinct responses of macrophages to Toxoplasma infection and the potential roles of ARAF in fighting against infection via phosphorylation of crucial proteins.

Project description:Toxoplasma gondii transmitted via various route and rapidly duplicated during the acute infection, which caused the important zoonosis regarding to medicine and veterinary, toxoplasmosis. T. gondii possessed innate capability of producing nitric oxide (NO) and nitric oxide derivatives and S-nitrosylation not only participated in their signaling transduction, but also was a regulatory mechanism of protein post-translation. To date, S-nitrosylation proteome of T .gondii remains a mystery. In present study, we reported the first S-nitrosylated proteomic profile in T. gondii using mass spectrometry in combination with resin-assisted enrichment. 637 proteins were found to be S-nitrosylated and more than half of these S-nitrosylated proteins were localized in nucleus or cy-toplasm. Motif analysis identified seven motifs including five motifs containing lysine and two motif harboring isoleucine. GO enrichment revealed that S-nitrosylated proteins were mainly lo-cated in the mitochondrial inner membrane and organelle inner membrane in the cell. Those S-nitrosylated proteins were related with diverse biological and metabolic processes including or-ganic acid binding, carboxylic acid binding ribose and phosphate biosynthetic process. Glycoly-sis/gluconeogenesis and aminoacyl-tRNA biosynthesis were two remarkable pathways in which T. gondii S-nitrosylated proteins engaged. Twenty seven ribosomal proteins and eleven microneme proteins out of 22 secretory proteins were identified as S-nitrosylated proteins, which suggested that proteins in ribosome and microneme were S-nitrosylated with high proportion. PPI analysis identified three subnetworks with high relevancy ribosome, RNA transport and chaperonin com-plex component. These results implied that S-nitrosylated proteins in T. gondii were associated with protein translation in ribosome, gene transcription, invasion and proliferation of T. gondii. Our research firstly identified the S-nitrosylated proteomic profile of T. gondii and will provide a valuable resource for deep-going investigation of the functions of S-nitrosylation in T. gondii.

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