The antifungal activity of a thaumatin-like protein from oyster Crassostrea gigas

Authors

  • X Niu Liaoning Key Laboratory of Marine Animal Immunology, Dalian Ocean University, Dalian 116023, China ; Liaoning Key Laboratory of Marine Animal Immunology & Disease Control, Dalian Ocean University, Dalian 16023, China
  • Q Xu Liaoning Key Laboratory of Marine Animal Immunology, Dalian Ocean University, Dalian 116023, China ; Liaoning Key Laboratory of Marine Animal Immunology & Disease Control, Dalian Ocean University, Dalian 16023, China
  • W Wang Liaoning Key Laboratory of Marine Animal Immunology, Dalian Ocean University, Dalian 116023, China ; Liaoning Key Laboratory of Marine Animal Immunology & Disease Control, Dalian Ocean University, Dalian 16023, China
  • Z Yu Liaoning Key Laboratory of Marine Animal Immunology, Dalian Ocean University, Dalian 116023, China ; Liaoning Key Laboratory of Marine Animal Immunology & Disease Control, Dalian Ocean University, Dalian 16023, China
  • Z Liu Liaoning Key Laboratory of Marine Animal Immunology, Dalian Ocean University, Dalian 116023, China ; Liaoning Key Laboratory of Marine Animal Immunology & Disease Control, Dalian Ocean University, Dalian 16023, China
  • C Qu Liaoning Key Laboratory of Marine Animal Immunology, Dalian Ocean University, Dalian 116023, China ; Liaoning Key Laboratory of Marine Animal Immunology & Disease Control, Dalian Ocean University, Dalian 16023, China
  • Y Liu Liaoning Key Laboratory of Marine Animal Immunology, Dalian Ocean University, Dalian 116023, China ; Liaoning Key Laboratory of Marine Animal Immunology & Disease Control, Dalian Ocean University, Dalian 16023, China
  • C Gong Liaoning Key Laboratory of Marine Animal Immunology, Dalian Ocean University, Dalian 116023, China ; Liaoning Key Laboratory of Marine Animal Immunology & Disease Control, Dalian Ocean University, Dalian 16023, China
  • L Wang Liaoning Key Laboratory of Marine Animal Immunology, Dalian Ocean University, Dalian 116023, China Laboratory of Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266235, China ; Liaoning Key Laboratory of Marine Animal Immunology & Disease Control, Dalian Ocean University, Dalian 16023, China ; Dalian Key Laboratory of Disease Prevention and Control for Aquaculture Animals, Dalian Ocean University, Dalian 116023, China
  • L Song Liaoning Key Laboratory of Marine Animal Immunology, Dalian Ocean University, Dalian 116023, China Laboratory of Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266235, China ; Liaoning Key Laboratory of Marine Animal Immunology & Disease Control, Dalian Ocean University, Dalian 16023, China ; Dalian Key Laboratory of Disease Prevention and Control for Aquaculture Animals, Dalian Ocean University, Dalian 116023, China

DOI:

https://doi.org/10.25431/1824-307X/isj.v15i1.210-222

Keywords:

Crassostrea gigas, Thaumatin-like protein, Antifungal activity, Immune response

Abstract

In the present study, a thaumatin-like protein (CgTLP) was identified from the oyster Crassostrea gigas. The full-length cDNA of CgTLP was of 913 bp with a 5’ untranslated regions (UTR) of 98 bp, a 3’ UTR of 80 bp, and an open reading frame (ORF) of 735 bp encoding a polypeptide of 244 residues. The CgTLP gene was expressed ubiquitously in mantle, gonad, hemocytes, hepatopancreas, gill, and adductor muscle with the higher expression levels in adductor muscle, hemocytes, and hepatopancreas. Immunofluorescence assay indicated that CgTLP was mainly distributed in the cytoplasm of hemocytes. The mRNA expression levels of CgTLP in hemocytes were significantly up-regulated after the stimulations with mannan (13.69-fold, p < 0.05), Pichia pastoris (8.85-fold, p < 0.05) and polyinosinic-polycytidylic acid (3.62-fold, p < 0.05), but did not change significantly after stimulations with lipopolysaccharide, peptidoglycan, and Vibrio splendidus. The recombinant CgTLP protein (rCgTLP) significantly inhibited the proliferation of P. pastoris (p < 0.05), while no inhibition towards Staphylococcus aureus and V. splendidus. rCgTLP also displayed obvious β-1,3-glucanase activity, while no enzymatic activity towards chitin. These results collectively indicated that CgTLP was a homologue of TLP, which might play a vital role in defensing against fungal infection in C. gigas.

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Published

2018-06-07

Issue

Vol. 15 No. 1 (2018)

Section

Research Reports