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. 2021 May 26;9:685913. doi: 10.3389/fcell.2021.685913

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Copyright © 2021 Yao, Xu, Zhou, Wu, Zou, Chen, Chen and Peng.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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TgROP18_I targets host TRIM21 for immune escape. 1. Host IFN-γ-induced factor TRIM21 restricted T. gondii replication through NF-κB activation and TRIM21 overexpression suppressed the p65-IκB-α interaction to activate NF-κB pathway. 2. TgROP18_I which was discharged by T. gondii, interacted with the PRY-SPRY domain of human TRIM21, promoted TRIM21 phosphorylation, and induced TRIM21 degradation via lysosomal pathway. 3. IFN-γ induced ubiquitin labeling on the CEP PVM which resulted in PV acidification and death of parasites, but this labeling was relieved by TRIM21 knockdown regardless of IFN-γ simulation or not.