Publication: PmRab7 is a VP28-binding protein involved in white spot syndrome virus infection in shrimp
Issued Date
2006-11-01
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ISSN
0022538X
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2-s2.0-33750330666
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Mahidol University
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SCOPUS
Bibliographic Citation
Journal of Virology. Vol.80, No.21 (2006), 10734-10742
Suggested Citation
Kallaya Sritunyalucksana, Wanphen Wannapapho, Chu Fang Lo, Timothy W. Flegel PmRab7 is a VP28-binding protein involved in white spot syndrome virus infection in shrimp. Journal of Virology. Vol.80, No.21 (2006), 10734-10742. doi:10.1128/JVI.00349-06 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/23287
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Title
PmRab7 is a VP28-binding protein involved in white spot syndrome virus infection in shrimp
Abstract
Our aim was to isolate and characterize white spot syndrome virus (WSSV)-binding proteins from shrimp. After a blot of shrimp hemocyte membrane proteins was overlaid with a recombinant WSSV envelope protein (rVP28), the reactive bands on the blot were detected using anti-VP28 antibody. Among three membrane-associated molecules identified by liquid chromatography-tandem mass spectrometry, there was a 25-kDa protein that bound to both rVP28 and WSSV. Since it had a primary structure with high homology to the small GTP-binding protein Rab7, we named it Penaeus monodon Rab7 (PmRab7). The full-length PmRab7 cDNA was obtained, and results from a glutathione S-transferase pull-down assay confirmed specific binding to rVP28. Reverse transcriptase PCR analysis revealed PmRab7 expression in many tissues, and real-time PCR analysis revealed that expression was constitutive. Binding of PmRab7 to rVP28 or WSSV occurred in a dose-dependent manner and was inhibited by anti-Rab7 antibody. In an in vivo neutralization assay, the number of dead shrimp after challenge with WSSV plus PmRab7 (15%) or WSSV plus anti-Rab7 antibody (5%) was significantly lower than after challenge with WSSV alone (95%). In contrast to the WSSV-injected group, shrimp injected with WSSV plus PmRab7 or WSSV plus anti-Rab7 showed no WSSV-type histopathology. We conclude that PmRab7 is involved in WSSV infection in shrimp. This is the first study to identify a shrimp protein that binds directly to a major viral envelope protein of WSSV. Copyright © 2006, American Society for Microbiology. All Rights Reserved.