Abstract:
Yellow head virus is a highly virulent shrimp pathogen that can cause mass
mortalities in farmed penaeid shrimp. To define the change of the protein
expression profile of YHV infection, a comparative analysis of proteomic profiles of
control and YHV-infected was performed in gill of shrimp by 2-DE. In this
proteomic analysis of gills from YHV-infected Penaeus vannamei, we identified 13
spots with up-regulated protein expression levels and 5 spots with down-regulated
levels. LC-nanoESI-MS/MS indicated that the up-regulated proteins included
enzymes in the glycolytic pathway, the TCA cycle and amino acid metabolism. The
other up-regulated proteins were arginine kinase, imaginal disc growth factor
(IDGF) and a Ras-like GTP binding protein. By contrast, expression levels were
reduced for sarcoplasmic calcium binding proteins (SCPs), actin-1, valosincontaining
protein and Rab11. The expression of SCP and enolase by Western blot
and imuno-fluorescence also revealed the change in the level of these proteins after
YHV infection corresponding to 2-DE results. However, time-course assays by
Real time RT-PCR revealed no significant increase in mRNA level of glycolytic
enzymes and arginine kinase except a significant decrease in SCP mRNA. When
screening of SCP promoter from fosmid DNA library of P. monodon, some clones
from the library possibly contained SCP promoter. The results presented here
provide preliminary data on the interaction between YHV and more insights into the
pathogenesis and mechanism of YHV infection in P. vannamei in the future.