期刊
VIROLOGY
卷 509, 期 -, 页码 222-231出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.virol.2017.06.023
关键词
Foot-and-mouth disease virus; PKR; 3C(pro); Lysosomes
类别
资金
- National Science and Technology Ministry [2015BAD12B04]
- Gansu Science Foundation [1606RJDA313, 1606RJYA280]
The interferon-induced double-strand RNA activated protein kinase (PKR) plays important roles in host defense against viral infection. Here we demonstrate the significant antiviral role of PKR against foot-and-mouth disease virus (FMDV) and report that FMDV infection inhibits PKR expression and activation in porcine kidney (PK-15) cells. The viral nonstructural protein 3 C proteinase (3C(pro)) is identified to be responsible for this inhibition. However, it is independent of the well-known proteinase activity of 3C(Pro) or 3C(Pro)-induced shutoff of host protein synthesis. We show that 3C(Pro) induces PKR degradation by lysosomal pathway and no interaction is determined between 3C(Pro) and PKR. Together, our results indicate that PKR acts an important antiviral factor during FMDV infection, and FMDV has evolved a strategy to overcome PKR-mediated antiviral role by downregulation of PKR protein.
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