1. Academic Validation
  2. A picorna-like virus suppresses the N-end rule pathway to inhibit apoptosis

A picorna-like virus suppresses the N-end rule pathway to inhibit apoptosis

  • Elife. 2017 Dec 12;6:e30590. doi: 10.7554/eLife.30590.
Zhaowei Wang  # 1 2 Xiaoling Xia  # 1 2 3 Xueli Yang 1 Xueyi Zhang 1 2 Yongxiang Liu 1 2 Di Wu 1 2 Yuan Fang 1 2 Yujie Liu 1 2 Jiuyue Xu 2 Yang Qiu 2 Xi Zhou 1 2
Affiliations

Affiliations

  • 1 State Key Laboratory of Virology, College of Life Sciences, Wuhan University, Wuhan, China.
  • 2 State Key Laboratory of Virology, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan, China.
  • 3 Guangzhou Key Laboratory of Insect Development Regulation and Application Research, Institute of Insect Science and Technology & School of Life Sciences, South China Normal University, Guangzhou, China.
  • # Contributed equally.
Abstract

The N-end rule pathway is an evolutionarily conserved proteolytic system that degrades proteins containing N-terminal degradation signals called N-degrons, and has emerged as a key regulator of various processes. Viruses manipulate diverse host pathways to facilitate viral replication and evade Antiviral defenses. However, it remains unclear if viral Infection has any impact on the N-end rule pathway. Here, using a picorna-like virus as a model, we found that viral Infection promoted the accumulation of caspase-cleaved Drosophila inhibitor of Apoptosis 1 (DIAP1) by inducing the degradation of N-terminal amidohydrolase 1 (NTAN1), a key N-end rule component that identifies N-degron to initiate the process. The virus-induced NTAN1 degradation is independent of polyubiquitylation but dependent on Proteasome. Furthermore, the virus-induced N-end rule pathway suppression inhibits Apoptosis and benefits viral replication. Thus, our findings demonstrate that a virus can suppress the N-end rule pathway, and uncover a new mechanism for virus to evade Apoptosis.

Keywords

D. melanogaster; Drosophila C virus; N-end rule pathway; apoptosis; immunology; infectious disease; microbiology.

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