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Journal of Integrative Agriculture  2017, Vol. 16 Issue (11): 2573-2585    DOI: 10.1016/S2095-3119(17)61670-8
Animal Science · Veterinary Medicine Advanced Online Publication | Current Issue | Archive | Adv Search |
Critical role of cytochrome c1 and its cleavage in porcine reproductive and respiratory syndrome virus nonstructural protein 4-induced cell apoptosis via interaction with nsp4
ZHANG Feng, GAO Peng, GE Xin-na, ZHOU Lei, GUO Xin, YANG Han-chun
Key Laboratory of Animal Epidemiology of the Ministry of Agriculture, College of Veterinary Medicine, State Key Laboratory of Agrobiotechnology, China Agricultural University, Beijing 100193, P.R.China
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Abstract      Porcine reproductive and respiratory syndrome virus (PRRSV) actively induces cell apoptosis both in vitro and in vivo, which can contribute critically to viral pathogenesis.  Previous studies have shown that the PRRSV nonstructural protein 4 (nsp4) is an important mediator of this process, but the underlying molecular details remain poorly understood.  In this study, we found that the PRRSV nsp4 interacted with the mitochondrial inner membrane protein cytochrome c1 (cyto.c1) and induced its proteolytic cleavage.  Interestingly, the cleaved N-terminal fragment of cyto.c1 was found to exert apoptotic activity, which could cause mitochondrial fragmentation, resulting in apoptotic cell death.  And RNA interference (RNAi) silencing experiments further confirmed the crucial role which cyto.c1 played in nsp4- and PRRSV-induced cell apoptosis.  Thus, our data provide an important piece of mechanistic clues for PRRSV-induced cell apoptosis and also elucidate a novel mechanism for the 3C-like proteases in this finding. 
Keywords:  PRRSV        nonstructural protein4 (nsp4)        cytochrome c1 (cyto.c1)        interaction        cleavage        apoptosis  
Received: 09 March 2017   Accepted:
Fund: 

This study was supported by the National 973 Program of China (2014CB542700), the National Natural Science Foundation of China (31330077, 31540004), and the earmarked fund for China Agriculture Research System (CARS-36).

Corresponding Authors:  Correspondence YANG Han-chun, Tel/Fax: +86-10-62731296, E-mail: yanghanchun1@cau.edu.cn   
About author:  ZHANG Feng, Tel: +86-10-62733962, E-mail: xhz-111@163.com

Cite this article: 

ZHANG Feng, GAO Peng, GE Xin-na, ZHOU Lei, GUO Xin, YANG Han-chun. 2017. Critical role of cytochrome c1 and its cleavage in porcine reproductive and respiratory syndrome virus nonstructural protein 4-induced cell apoptosis via interaction with nsp4. Journal of Integrative Agriculture, 16(11): 2573-2585.

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