Expression profiles of selenium dependent glutathione peroxidase and glutathione S-transferase from Exopalaemon carinicauda in response to Vibrio anguillarum and WSSV challenge
文献类型: 外文期刊
作者: Duan, Yafei 1 ; Liu, Ping 1 ; Li, Jitao 1 ; Li, Jian 1 ; Chen, Ping 1 ;
作者机构: 1.Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst, Minist Agr, Key Lab Sustainable Dev Marine Fisheries, Qingdao 266071, Peoples R China
2.Shanghai Ocean Univ, Coll Fisheries & Life Sci, Shanghai 201306, Peoples R China
关键词: Exopalaemon carinicauda;Glutathione peroxidase (GPx);Glutathione S-transferases (GST);Gene cloning;Expression
期刊名称:FISH & SHELLFISH IMMUNOLOGY ( 影响因子:4.581; 五年影响因子:4.851 )
ISSN:
年卷期:
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收录情况: SCI
摘要: A selenium-dependent glutathione peroxidase cDNA was obtained from the ridgetail white prawn Exopalaemon carinicauda (EcGPx) by rapid amplification of cDNA ends (RACE) methods. The full-length cDNA of EcGPx was 946 bp, which contains a 5'-untranslated region (UTR) of 105 bp, 3'-UTR of 280 bp with a poly (A) tail, an open reading frame (ORF) of 561 bp, encoding a 186 amino-acid polypeptide with the predicted molecular weight of 21.35 kDa and estimated isoelectric point of 7.65. It involves a putative selenocysteine (U-39) residue which is encoded by an opal codon, (220)TGA(222), and forms an active site with residues Q(73) and W-141. Sequence analysis revealed that a GPx signature motif 2 ((63)LAFPCNQF(76)), an extra active site motif ((WNFEKF156)-W-151), two putative N-glycosylation site ((NNT77)-N-75 and (107)NGS(109)), and two arginine residues (R-89 and R-167) were observed in the EcGPx sequence. Comparison of amino acid sequences showed that white shrimp GPx is more closely related to GPx1 and GPx2 subgroups. Quantitative real-time RT-PCR analysis indicated that two glutathione antioxidant enzymes of E. carinicauda, glutathione peroxidase (designated EcGPx) and glutathione S-transferase (designated EcGST) were widely expressed in all the tested tissues, but showed different expression patterns. After Vibrio anguillarum and WSSV challenge, EcGPx and EcGST transcripts both in hemocytes and hepatopancreas increased in the first 6 h and 3 h, respectively. The results suggested that EcGPx and EcGST might be associated with the immune defenses to V anguillarum and WSSV in E. carinicauda. Crown Copyright (C) 2013 Published by Elsevier Ltd. All rights reserved.
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