Translationally controlled tumor protein is required for the fast growth of Toxoplasma gondii and maintenance of its intracellular development

文献类型： 外文期刊

第一作者： Zheng, Jun

作者： Zheng, Jun;Chen, Yaping;Li, Zhaoran;Cao, Shinuo;Zhang, Zhaoxia;Jia, Honglin

作者机构：

关键词： TCTP;knockout;invasion;replication;egress

期刊名称：FASEB JOURNAL （ 影响因子：5.191； 五年影响因子：5.955 ）

ISSN： 0892-6638

年卷期： 2018 年 32 卷 2 期

页码：

收录情况： SCI

摘要： Translationally controlled tumor protein (TCTP) is a highly conserved, multifunctional protein that has been implicated in a range of cell physiologic processes, especially cell growth and development. ATCTP-like gene has been identified in the Toxoplasma genome [Toxoplasma gondii TCTP (TgTCTP)], although its function remains unknown. The sequence analysis of TgTCTP indicated that it is a highly conserved protein in eukaryotes. We found that the expression level of TgTCTP in the virulent RH strain was significantly higher than that in the avirulent PLK strain. Indirect immunofluorescence showed that TgTCTP was expressed in the parasite cytoplasm. The localization of TgTCTP was unchanged during the replication of the parasite. We expressed a functional recombinant TgTCTP (rTgTCTP) protein in Escherichia coli and found that the recombinant protein could form a multimer. We then evaluated the function of TgTCTP using the clustered regularly interspaced short palindromic repeats (CRISPR)/CRISPR-associated protein 9 knockout (KO) system. Phenotypic analysis of the KO strain (Delta TgTCTP) revealed that TgTCTP is required for the robust growth of the parasites. TgTCTP deficiency also led to early egress of the parasites and subsequent impairment in their invasion and attachment abilities. We subsequently found that the multimer formof TgTCTP might not be necessary for the growth and replication of the parasite. Then the expression profiling of genes in the Delta TgTCTP and complement strains were analyzed. The results revealed that 988 genes were regulated in Delta TgTCTP compared with the complement strain. Overall, although not essential, TgTCTP is required for the fast growth of Tg and maintenance of its intracellular development.

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