1887

Abstract

The 27.8 kDa protein in flounder gill (FG) cells was previously proved to be a receptor specific for lymphocystis disease virus (LCDV) entry and infection. In this paper, a 32 kDa viral attachment protein (VAP) of LCDV specifically binding to the 27.8 kDa receptor (27.8R) was found by far-Western blotting coupled with monoclonal antibodies (MAbs) against 27.8R. The 32 kDa protein was confirmed to be encoded by the open reading frame (ORF) 038 gene in LCDV-C, and predicted to contain a putative transmembrane region, multiple N-myristoylation and glycosylation sites and phosphorylation motifs. The expression plasmid of pET-32a-ORF038 was constructed and the recombinant VAP (rVAP) was obtained. Rabbit polyclonal antibodies against the rVAP were prepared and could recognize the rVAP and 32 kDa protein in LCDV. Immunogold electron microscopy showed that the 32 kDa protein was located on the surface of LCDV particles. Immunofluorescence assay demonstrated that the rVAP could bind to the 27.8R on the cell membrane of the FG monolayer and the anti-27.8R MAbs could block the rVAP binding. Pre-incubation of the rVAP with FG cells before LCDV infection, or pre-incubation of LCDV with the antibodies against the rVAP, could significantly decrease the LCDV copy numbers (<0.05) and delay the emergence of cytopathic effects in FG cells in a dose-dependent manner. These results indicated for the first time that the 32 kDa protein functioned as an attachment protein for the initial attachment and entry of LCDV, and the interaction of the 32 kDa VAP with the 27.8R-initiated LCDV infection.

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2017-06-01
2020-01-24
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