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An E3 ubiquitin ligase TRIM9 is involved in WSSV infection via interaction with β-TrCP.

  • Mingzhe Sun‎ et al.
  • Developmental and comparative immunology‎
  • 2019‎

The TRIpartite Motif (TRIM) proteins are known to play key roles in cell differentiation, apoptosis, development, autophagy and innate immunity. In the present study, a TRIM9 homolog (named LvTRIM9) was identified from the transcriptome of the Pacific whiteleg shrimp Litopenaeus vannamei. The deduced amino acid sequence of LvTRIM9 possessed typical features of TRIMs, consisting of a RING domain, two B-boxes, a coiled-coil domain, a FN3 domain, and a SPRY domain. The transcript of LvTRIM9 was detected in most tissues of the shrimp. Its expression level was obviously up-regulated at 3, 12 and 24 h post white spot syndrome virus (WSSV) infection. Knockdown of LvTRIM9 gene expression by double-strand RNA mediated interference could lead to a decrease of virus copy number in WSSV-infected shrimp. Yeast two-hybrid analysis showed that LvTRIM9 could directly interact with beta-transducin repeat-containing protein of shrimp (Lvβ-TrCP), an inhibitor of NF-κB pathway. Meanwhile, knockdown of LvTRIM9 could also up-regulate the expression levels of LvRelish and downstream production of antimicrobial peptides in the intestine of shrimp. These data indicated that WSSV might hijack the LvTRIM9 for its propagation through inhibition of NF-κB pathway and downstream antimicrobial peptides production via interaction of LvTRIM9 with Lvβ-TrCP in shrimp. The study improved our understanding about the impact of E3 ubiquitin ligases on the innate immune signaling pathway of shrimp and its role during WSSV infection.


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