Molecular cloning, expression and functional analysis of B-cell activating factor (BAFF) in yellow grouper, Epinephelus awoara

•We first report the cloning and characterization of the yellow grouper BAFF.•EasBAFF was efficiently expressed and purified.•WST-8 assay indicated that EasBAFF could promote the survival/proliferation of yellow grouper splenic lymphocytes.•The role of BAFF may be useful for understanding the anti-b...

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Published inMolecular immunology Vol. 59; no. 1; pp. 64 - 70
Main Authors Xiao, Wen, Long, Wei, Liu, Gui-you, Sui, Chun-liang, Guo, Xi-rong, Tian, Aiying, Ji, Chen-bo, Cui, Xian-wei, Zhang, Shuang-Quan
Format Journal Article
LanguageEnglish
Published England Elsevier Ltd 01.05.2014
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Summary:•We first report the cloning and characterization of the yellow grouper BAFF.•EasBAFF was efficiently expressed and purified.•WST-8 assay indicated that EasBAFF could promote the survival/proliferation of yellow grouper splenic lymphocytes.•The role of BAFF may be useful for understanding the anti-bacteria immunity in fish. B cell activating factor (BAFF), a ligand belonging to the tumor necrosis factor (TNF) family is critical to B cell survival, proliferation, maturation and immunoglobulin secretion. In this study, the yellow grouper (Epinephelus awoara) BAFF (designated EaBAFF) gene was cloned using RT-PCR and RACE (rapid amplification of cDNA ends) techniques. The full-length EaBAFF was 1442bp and contained an open reading frame of 780bp encoding a putative protein of 259 amino acids. Amino acids sequence comparison indicated that EaBAFF possessed the TNF signature. The soluble BAFF (EasBAFF) had been cloned into pET28a. SDS-PAGE and Western blotting analysis confirmed that the soluble fusion protein His-EasBAFF was efficiently expressed in Escherichia coli BL21 (DE3). In vitro, the WST-8 assay indicated that EasBAFF was not only able to promote the survival/proliferation of yellow grouper splenic lymphocytes but also able to promote the survival/proliferation of mouse splenic B cells. Our findings may provide valuable information for research into the immune system of E. awoara and EasBAFF may serve as a potential immunologic factor for enhancing immunological efficacy in fish.
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ISSN:0161-5890
1872-9142
DOI:10.1016/j.molimm.2014.01.005