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The Penaeus stylirostris densovirus capsid interacts with Litopenaeus vannamei troponin I.
Fish & Shellfish Immunology 2019 March
The Penaeus stylirostris densovirus (PstDNV) (also known as infectious hypodermal and hematopoietic necrosis virus, IHHNV), a very small DNA virus, is a major shrimp pathogen. The PstDNV genome encodes only two nonstructural proteins and one capsid protein. This virus is thus an ideal, simple model for the investigation of virus-host interactions. To explore the role of the PstDNV capsid in viral infections, a yeast two-hybrid (Y2H) cDNA library was constructed based on Pacific white shrimp, Litopenaeus vannamei mRNA. The Y2H library was then screened, using the PstDNV capsid protein as bait. We identified a host protein that interacted strongly with the PstDNV capsid as L. vannamei troponin I (LvTnI). An in vitro co-immunoprecipitation experiment further supported this interaction. In addition, an in vivo neutralization experiment showed that the vaccination with anti-LvTnI significantly reduced PstDNV copies in PstDNV-challenged shrimp, indicating that the interaction between the PstDNV capsid and cellular LvTnI is essential for PstDNV infection. This result has important implications for our understanding of the mechanisms by which PstDNV infects shrimp.
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