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Identification and Characterization of a Novel Apical Membrane Antigen 3 in Eimeria tenella

文献类型： 外文期刊

作者： Qingjie Wang;Shunhai Zhu;Qiping Zhao;Bing Huang;Shuilan Yu;Yu Yu;Shanshan Liang;Haixia Wang;Huanzhi Zhao;Hongyu Han;Hui Dong

作者机构：

关键词： Apicomplexa; invasion; microneme

期刊名称： J. Eukaryotic Microbiol.

ISSN： 1066-5234

年卷期： 2021 年 68 卷 2 期

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收录情况： JCR（2021版）

摘要： Eimeria tenella is an obligate intracellular parasite in the phylum Apicomplexa. As described for other members of Apicomplexa, apical membrane antigen 1 (AMA1) has been shown to be critical for sporozoite invasion of host cells by E. tenella. Recently, an E. tenella paralogue of AMA1 (EtAMA1), dubbed sporoAMA1 (EtAMA3), was identified in proteomic and transcriptomic analyses of E. tenella, but not further characterized. Here, we show that EtAMA3 is a type I integral membrane protein that has 24% −38% identity with other EtAMAs. EtAMA3 has the same pattern of Cys residues in domains I and II of AMA1 orthologs from apicomplexan parasites, but high variance in domain III, with all six invariant Cys residues absent. EtAMA3 expression was developmentally regulated at the mRNA and protein levels. EtAMA3 protein was detected in sporulated oocysts and sporozoites, but not in the unsporulated oocysts or second-generation merozoites. EtAMA3 is secreted by micronemes and is primarily localized to the apical end of sporozoites during host-cell invasion. Additionally, pretreatment of sporozoites with rEtAMA3-specific antibodies substantially impeded their invasion into host cells. These results suggest EtAMA3 is a sporozoite-specific protein that is involved in host-cell sporozoite invasion. © 2020 International Society of Protistologists

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