A novel peroxinectin involved in antiviral and antibacterial immunity of mud crab, Scylla paramamosain

文献类型： 外文期刊

第一作者： Du, Zhi-Qiang

作者： Du, Zhi-Qiang;Ren, Qian;Ren, Qian;Huang, An-Ming;Fang, Wen-Hong;Zhou, Jun-Fang;Gao, Lu-Jiao;Li, Xin-Cang

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关键词： Sp-PX;RNA-seq;Expression pattern;White spot syndrome virus proliferation profile;Mud crab

期刊名称：MOLECULAR BIOLOGY REPORTS （ 影响因子：2.316； 五年影响因子：2.357 ）

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收录情况： SCI

摘要： Peroxinectin (PX) with cell adhesion and peroxidase activities is important in invertebrate immune responses. We identified a novel PX homolog from Scylla paramamosain (designated as Sp-PX) through transcriptome sequencing. The full-length of cDNA sequence was 3,165 bp. And there was a peroxidase domain in the deduced protein sequence. A cell-adhesive sequence (KGD motif) was also found in the N-terminus. The predicted molecular mass of the mature protein is 83.9 kDa, with an estimated pI of 6.21. At the amino acid level, Sp-PX shared much higher similarities with other crustaceans PX proteins. And Sp-PX also exhibited some similarities with other peroxidase family members. According to real-time polymerase chain reaction, Sp-PX was mainly distributed in the hemocytes. The gene expression levels in the hemocytes of the normal and white spot syndrome virus (WSSV)-challenged crabs were compared via high-throughput RNA sequencing technology, and the results showed that Sp-PX was upregulated at 48 h post-WSSV challenge. Subsequently, how Sp-PX responds to WSSV stimulus was explored through time-course experiments. The Sp-PX transcripts dramatically increased and reached the highest level at 12 h post-injection, whereas Sp-PX transcripts were recovered at 96 h post-challenge. Meanwhile, it was found that the WSSV copies proliferated significantly after a period of latent viral infection for 48 h. In addition,Sp-PX transcripts were also upregulated after Vibrio harveyi or Staphylococcus aureus challenge. Overall, Sp-PX not only participates in antibacterial immunity but also plays a crucial role in the antiviral immune responses of mud crab at the early stage of WSSV infection.

分类号： Q7

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