A sialic acid-binding lectin with bactericidal and opsonic activities from Ruditapes philippinarum
文献类型： 外文期刊
作者： Zhang, Jianning 1 ; Zhang, Yifei 1 ; Zhang, Linbao 3 ; Wei, Qianyu 5 ; Liu, Xiaoli 1 ; Yang, Dinglong 4 ;
作者机构： 1.Ludong Univ, Sch Life Sci, Yantai 264025, Peoples R China
2.Ludong Univ, Coastal Resources & Environm Team Blue Yellow Are, Yantai 264025, Peoples R China
3.Chinese Acad Fisheries Sci, Guangdong Prov Key Lab Fishery Ecol & Environm, South China Sea Fisheries Res Inst, Guangzhou 510300, Guangdong, Peoples R China
4.Chinese Acad Sci, Yantai Inst Coastal Zone Res, Muping Coastal Environm Res Stn, Yantai 264003, Peoples R China
5.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao 266071, Shandong, Peoples R China
关键词： Ruditapes philippinarum; Sialic acid-binding lectin; Pattern recognition receptor; Immune recognition
期刊名称：FISH & SHELLFISH IMMUNOLOGY （ 影响因子：4.581； 五年影响因子：4.851 ）
ISSN： 1050-4648
年卷期： 2019 年 94 卷
页码：
收录情况： SCI
摘要： In the present study, a sialic acid-binding lectin was cloned and characterized from Manila clam Ruditapes philippinarum (designed as RpSabl). The open reading frame of RpSabl encoded a polypepdde of 162 amino acids with a calculated molecular mass of 17.7 kDa. Analysis of the conserved domain suggested that RpSabl was a new member of the sialic acid-binding lectins family. In non-stimulated clams, RpSabl transcripts were constitutively expressed in all five tested tissues, especially in hepatopancreas. After Vibrio anguillarum challenge, the expression of RpSabl mRNA in hepatopancreas was significantly up-regulated at 3 h (3.8-fold, P < 0.05), 6 h (4.9-fold, P < 0.05), 12 h (12.3-fold, P < 0.01) and 24 h (9.7-fold, P < 0.01), while RpSabl transcripts in hemocytes was only significantly up-regulated at 6h (8.5-Fold, P < 0.01). MAI-mediated knockdown of RpSabl transcripts affected the survival rates of Manila clam against V. anguillarum, perhaps mainly due to the inhibited expression of antibacterial effectors (e.g. lysozyme and defensin). Moreover, recombinant protein of RpSabl (rRpSabl) possessed binding activities towards lipopolysaccharides (LPS), peptidoglycan (PGN) and glucan in vitro. Coinciding with the Pathogen-associated molecular patterns (PAMPs) binding assay, rRpSabl displayed broad bacterial-agglutination properties towards Vibrio harveyi, Vibrio splendidus, V. anguillarum, Enterobacter cloacae and Aeromonas hydrophila. Meanwhile, the phagocytosis and encapsulation ability of hemocytes could be significantly enhanced by rRpSabl incubation. All these results showed that RpSabl could function as a versatile molecule involved in the innate immune responses of R. philippinarum.
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