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Swine Promyelocytic Leukemia Isoform II Inhibits Pseudorabies Virus Infection by Suppressing Viral Gene Transcription in Promyelocytic Leukemia Nuclear Bodies

文献类型： 外文期刊

作者： Yu, Cuilian 1 ; Xu, Aotian 1 ; Lang, Yue 1 ; Qin, Chao 1 ; Wang, Mengdong 1 ; Yuan, Xiufang 2 ; Sun, Shengfu 3 ; Feng, We 1 ;

作者机构： 1.China Agr Univ, Coll Vet Med, Beijing, Peoples R China

2.Zhejiang Acad Agr Sci, Inst Anim Husb & Vet Sci, Hangzhou, Peoples R China

3.Shandong Prov Ctr Anim Dis Control & Prevent, Jinan, Peoples R China

4.China Agr Univ, Coll Biol Sci, State Key Lab Agrobiotechnol, Beijing, Peoples R China

5.China Agr Univ, Coll Biol Sci, Dept Microbiol & Immunol, Beijing, Peoples R China

关键词： PML-NBs; alphaherpesviruses; pseudorabies virus; swine PML isoform II; transcription repressor

期刊名称：JOURNAL OF VIROLOGY （ 影响因子：5.103； 五年影响因子：5.078 ）

ISSN： 0022-538X

年卷期： 2020 年 94 卷 18 期

页码：

收录情况： SCI

摘要： Promyelocytic leukemia nuclear bodies (PML-NBs) possess an important intrinsic antiviral activity against alphaherpesvirus infection. PML is the structural backbone of NBs, comprising different isoforms. However, the contribution of each isoform to alphaherpesvirus restriction is not well understood. Here, we report the role of PML-NBs and swine PML (sPML) isoforms in pseudorabies virus (PRV) infection in its natural host swine cells. We found that sPML-NBs exhibit an anti-PRV activity in the context of increasing the expression level of endogenous sPML. Of four sPML isoforms cloned and examined, only isoforms sPML-II and -IIa, not sPML-I and -IVa, expressed in a sPML knockout cells inhibit PRV infection. Both the unique 7b region of sPML-II and the sumoylation-dependent normal formation of PML-NBs are required. 7b possesses a transcriptional repression activity and suppresses viral gene transcription during PRV infection with the cysteine residues 589 and 599 being critically involved. We conclude that sPML-NBs inhibit PRV infection partly by repressing viral gene transcription through the 7b region of sPML-II. IMPORTANCE PML-NBs are nuclear sites that mediate the antiviral restriction of alphaherpesvirus gene expression and replication. However, the contribution of each PML isoform to this activity of PML-NBs is not well characterized. Using PRV and its natural host swine cells as a system, we have discovered that the unique C terminus of sPML isoform II is required for PML-NBs to inhibit PRV infection by directly engag ing in repression of viral gene transcription. Our study not only confirms in swine cells that PML-NBs have an antiviral function but also presents a mechanism to sug gest that PML-NBs inhibit viral infection in an isoform specific manner.

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