畜牧兽医学报 ›› 2022, Vol. 53 ›› Issue (9): 3272-3278.doi: 10.11843/j.issn.0366-6964.2022.09.041

• 研究简报 • 上一篇    

非洲猪瘟病毒MGF360-14L靶向MAVS抑制Ⅰ型干扰素的产生

王洋1, 崔帅1, 鑫婷1, 王西西2, 于海男1, 陈世钰1, 蒋亚君1, 高新桃3, 庞忠宝1, 姜一曈1, 郭晓宇1, 贾红1, 朱鸿飞1*   

  1. 1. 中国农业科学院北京畜牧兽医研究所, 北京 100193;
    2. 中国科学院微生物研究所, 北京 100080;
    3. 中国农业科学院生物技术研究所, 北京 100081
  • 收稿日期:2022-01-10 出版日期:2022-09-23 发布日期:2022-09-23
  • 通讯作者: 朱鸿飞,主要从事预防兽医学研究,E-mail:bioclub@vip.sina.com
  • 作者简介:王洋(1990-),男,吉林公主岭人,博士生,主要从事预防兽医学研究,E-mail:wang691665@126.com
  • 基金资助:
    中国农业科学院基本科研业务费专项(Y2019YJ07-05);国家重点研发计划(2021YFD1800008)

ASFV MGF360-14L Interacts with MAVS and Inhibit the Expression of Type Ⅰ Interferon

WANG Yang1, CUI Shuai1, XIN Ting1, WANG Xixi2, YU Hainan1, CHEN Shiyu1, JIANG Yajun1, GAO Xintao3, PANG Zhongbao1, JIANG Yitong1, GUO Xiaoyu1, JIA Hong1, ZHU Hongfei1*   

  1. 1. Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China;
    2. Institute of Microbiology, Chinese Academy of Sciences, Beijing 100080, China;
    3. Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China
  • Received:2022-01-10 Online:2022-09-23 Published:2022-09-23

摘要: 本研究旨在探究非洲猪瘟病毒(African swine fever virus,ASFV)多基因家族成员MGF360-14L对Ⅰ型干扰素(IFN)的抑制作用及其作用机制。通过双荧光素酶试验检测MGF360-14L对线粒体抗病毒信号蛋白(MAVS)诱导的干扰素β(IFN-β)启动子活性的影响,免疫共沉淀和激光共聚焦检测MGF360-14L与MAVS的互作关系,及Western blot分析MGF360-14L对MAVS和TRIM21诱导的TBK1和IRF3磷酸化的影响。结果表明,ASFV非结构蛋白MGF360-14L抑制MAVS诱导的IFN-β启动子活性。MGF360-14L能够与MAVS互作,并且对MAVS和TRIM21诱导的TBK1和IRF3磷酸化具有抑制作用。此外,当过表达MGF360-14L时,MGF360-14L蛋白与TRIM21竞争结合MAVS,抑制TRIM21对MAVS的泛素化作用,从而降低IFN-β的水平。综上所述,MGF360-14L可能通过竞争性结合MAVS,抑制TRIM21对MAVS的泛素化,从而下调Ⅰ型IFN的产生。研究结果为探究ASFV的免疫逃逸机制提供了新线索。

关键词: 非洲猪瘟病毒, Ⅰ型干扰素, 线粒体抗病毒信号蛋白, 泛素化, 免疫逃逸

Abstract: This study was conducted to investigate the inhibitory effect of the African swine fever virus (ASFV) MGF360-14L on type Ⅰ interferon (IFN) and its mechanism. The effects of MGF360-14L on MAVS-induced IFN-β promoter activity were detected by dual luciferase assay, and the interaction between MGF360-14L and MAVS was examined by co-immunoprecipitation and indirect immunofluorescence assays. The results showed that the viral non-structural protein MGF360-14L inhibited interferon β (IFN-β) promoter activity induced by MAVS signaling. MGF360-14L interacted with MAVS and inhibited the phosphorylation of TBK1 and IRF3 induced by MAVS and TRIM21. In addition, MGFF360-14L competed with TRIM21 to bind MAVS and inhibit the TRIM21-mediated ubiquitination of MAVS, thereby reducing IFN-β levels. In conclusion, MGF360-14L may inhibit TRIM21-mediated ubiquitination of MAVS by competitively binding MAVS, thus down-regulating the production of type Ⅰ interferon. These findings provide new insights into the mechanisms underlying ASFV immune evasion.

Key words: African swine fever virus, type Ⅰ interferon, MAVS, ubiquitination, immune evasion

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