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Characterization and expression analysis of a chitinase gene (PmChi-5) from black tiger shrimp (Penaeus monodon) under pathogens infection and ambient ammonia-N stress
- Zhou, Falin, Zhou, Kaimin, Huang, Jianhua, Yang, Qibin, Jiang, Song, Qiu, Lihua, Yang, Lishi, Jiang, Shigui
- Fish & shellfish immunology 2018 v.72 pp. 117-123
- Penaeus monodon, Streptococcus agalactiae, Vibrio harveyi, amino acids, ammonium nitrogen, chitinase, complementary DNA, digestion, genes, hepatopancreas, immune response, larvae, messenger RNA, metamorphosis, molecular weight, molting, open reading frames, pathogens, tissues, viruses
- Chitinases are crucial enzymes for crustaceans. Previous researches had already revealed that chitinases play important roles in digestion, molting and defense against viruses. In the present study, a chitinase cDNA was identified from black tiger shrimp (Penaeus monodon) and designated as PmChi-5. The full-length PmChi-5 cDNA was 2860 bp in size, containing an open reading frame (ORF) of 1731 bp that encoded a protein of 576 amino acids with a deduced molecular weight of 64.8 kDa. Expression of the PmChi-5 mRNA was ubiquitously detected in all selected tissues, with the highest level in the gill and hepatopancreas. PmChi-5 was expressed throughout the whole larvae stages, and the highest level at Mysis3 stage, which indicated that PmChi-5 may be involved in larval metamorphosis. After challenged with Streptococcus agalactiae and Vibrio harveyi, the transcripts of PmChi-5 were found to be up-regulated significantly both in hepatopancreas and gill. Besides, the ammonia nitrogen stress treatment was also carried out, PmChi-5 transcripts were significantly changed in hepatopancreas and gill. The results showed that PmChi-5 may be involved in molting, larval metamorphosis, the immune defenses to pathogens infection and ammonia-N stress.