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Toll-Like Receptor 5 of Golden PompanoTrachinotus ovatus(Linnaeus 1758): Characterization, Promoter Activity and Functional Analysis

文献类型： 外文期刊

作者： Zhu, Ke-Cheng 1 ; Wu, Meng 1 ; Zhang, Dian-Chang 1 ; Guo, Hua-Yang 1 ; Zhang, Nan 1 ; Guo, Liang 1 ; Liu, Bao-Suo 1 ; Jia 1 ;

作者机构： 1.Chinese Acad Fishery Sci, South China Sea Fisheries Res Inst, Key Lab South China Sea Fishery Resources Exploit, Minist Agr & Rural Affairs, Guangzhou 510300, Peoples R China

2.Guangdong Prov Engineer Technol Res Ctr Marine Bi, Guangzhou 510300, Peoples R China

3.Chinese Acad Fishery Sci, Trop Aquaculture Res & Dev Ctr, South China Sea Fisheries Res Inst, Sanya 572018, Peoples R China

4.Sanya Trop Fisheries Res Inst, Sanya 510300, Peoples R China

关键词： Trachinotus ovatus; promoter activity; Toll-like receptor 5; binding assay

期刊名称：INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES （ 影响因子：5.923； 五年影响因子：6.132 ）

ISSN：

年卷期： 2020 年 21 卷 16 期

页码：

收录情况： SCI

摘要： Toll-like receptors (TLRs), as important pattern recognition receptors, represent a significant component of fish immune systems and play an important role in resisting the invasion of pathogenic microorganisms. The TLR5 subfamily contains two types of TLR5, the membrane form of TLR5 (TLR5M) and the soluble form of TLR5 (TLR5S), whose detailed functions have not been completely elucidated. In the present study, we first identified two genes,TLR5M(ToTLR5M) andTLR5S(ToTLR5S), from golden pompano (Trachinotus ovatus). The full-lengthToTLR5MandToTLR5ScDNA are 3644 bp and 2329 bp, respectively, comprising an open reading frame (ORF) of 2673 bp, encoding 890 amino acids, and an ORF of 1935 bp, encoding 644 amino acids. Both theToTLR5spossess representative TLR domains; however, onlyToTLR5Mhas transmembrane and intracellular TIR domains. Moreover, the transcription of twoToTLR5swas significantly upregulated after stimulation by polyinosinic:polycytidylic acid (poly (I:C)), lipopolysaccharide (LPS), and flagellin in both immune-related tissues (liver, intestine, blood, kidney, and skin) and nonimmune-related tissue (muscle). Furthermore, the results of bioinformatic and promoter analysis show that the transcription factors GATA-1 (GATA Binding Protein 1), C/EBPalpha (CCAAT Enhancer Binding Protein Alpha), and ICSBP (Interferon (IFN) consensus sequence binding protein) may play a positive role in moderating the expression of twoToTLR5s. Overexpression ofToTLR5MandToTLR5Snotably increasesNF-kappa B(nuclear factor kappa-B) activity. Additionally, the binding assay revealed that two rToTLR5s can bind specifically to bacteria and pathogen-associated molecular patterns (PAMPs) containingVibrio harveyi,Vibrio anguillarum,Vibrio vulnificus,Escherichia coli,Photobacterium damselae,Staphylococcus aureus,Aeromonas hydrophila, LPS, poly(I:C), flagellin, and peptidoglycan (PGN). In conclusion, the present study may help to elucidate the function of ToTLR5M/S and clarify their possible roles in the fish immune response to bacterial infection.

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