Molecular characterization and mRNA expression of catalase from pearl oyster Pinctada fucata

文献类型： 外文期刊

第一作者： Guo, Huayang

作者： Guo, Huayang;Zhang, Dianchang;Cui, Shuge;Chen, Mingqiang;Wu, Kaichang;Li, Youning;Su, Tianfeng;Jiang, Shigui;Guo, Huayang

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关键词： Pincatada fucata;Pearl oyster;Catalase;Reactive oxygen species;Immune response

期刊名称：MARINE GENOMICS （ 影响因子：1.71； 五年影响因子：1.969 ）

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收录情况： SCI

摘要： Catalase (EC 1.11.1.6) is an important antioxidant enzyme that protects aerobic organisms against oxidative damage by degrading hydrogen peroxide to water and oxygen. In the present study, a catalase cDNA of peal oyster Pincatada fucata (designated as PoCAT) is cloned and characterized by expressed sequence tag (EST) and rapid amplification of cDNA ends (RACE) methods. PoCAT is 2428 bp long and consists of a 5′-UTR of 140 bp, an unusually long 3′-UTR of 749 bp, and an open reading frame (ORF) of 1539 bp. The ORF of PoCAT encodes a polypeptide of 512 amino acids with molecular weight of 58.1 kDa and the theoretical isoelectric point of 8.4. PoCAT shares 62.3–82.2% identity and 73.0–92.0% similarity to other catalase amino acid sequences. Sequence alignment indicates that PoCAT contains the proximal heme-ligand signature sequence (R~(351)LFSYSDT~(358)), the proximal active site signature (F~(61)NRERIPERVVHAKGGGA~(78)), and the three catalytic amino acid residues (His~(72), Asn~(145), and Tyr~(355)). PoCAT has two potential glycosylation sites (N~(436)YS~(438) and N~(478)FS~(480)) and a peroxisome targeting signal (ASL). PoCAT mRNA was ubiquitously expressed in all detected tissues, and the expression level of PoCAT mRNA was higher in intestine and mantle. The expression profile analysis showed that the expression level of PoCAT mRNA in intestine was significantly up-regulated at 2, 4 and 12 h after Vibrio alginolyticus stimulation. These results demonstrated that PoCAT is a typical member of catalase family and might be involved in innate immune responses of pearl oyster.

分类号： Q3

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