White spot syndrome virus (WSSV) is a devastating viral pathogen of cultured shrimp worldwide. Previous studies have shown that the intact virion consists of at least 39 structural proteins and, among them, six were identified as envelope proteins involved in the virus infection. In this paper, the structural proteins VP36A, VP36B and VP31 (J Virol 2004; 78: 11360–11370), containing the RGD motif, were expressed in Escherichia coli and used to produce specific antibodies. Western blot confirmed that VP36A is a newly reported envelope protein. A neutralization assay with these three antibodies demonstrated that VP36A, VP36B and VP31 could significantly delay the initial infection of crayfish, but mortality still reached 100% at day 11 post-injection. However, a neutralization assay with the combination of antibodies against different envelope proteins showed that a combination of VP36B and VP31 antibodies could strongly inhibit WSSV infection in crayfish. These results revealed that multiple envelope proteins are involved in WSSV infection in crayfish and that VP36B and VP31 play a key role during this process.
Archives of Virology – Springer Journals
Published: Jul 1, 2006
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