Abstract:
:The Us11 protein of herpes simplex virus 1 (HSV-1) is an accessory factor with multiple functions. In virus-infected cells, it inhibits double-stranded RNA-dependent protein kinase (PKR), 2',5'-oligoadenylate synthetase, RIG-I, and MDA-5. However, its precise role is incompletely defined. By screening a human cDNA library, we showed that the Us11 protein targets heat shock protein 90 (Hsp90), which inactivates TANK binding kinase 1 (TBK1) and antiviral immunity. When ectopically expressed, HSV-1 Us11 precludes TBK1 from access to Hsp90 and interferon (IFN) promoter activation. Consistently, the Us11 protein, upon HSV infection, suppresses the expression of beta interferon (IFN-β), RANTES, and interferon-stimulated genes. This is mirrored by a blockade in the phosphorylation of interferon regulatory factor 3. Mechanistically, the Us11 protein associates with endogenous Hsp90 to disrupt the Hsp90-TBK1 complex. Furthermore, Us11 induces destabilization of TBK1 through a proteasome-dependent pathway. Accordingly, Us11 expression facilitates HSV growth. In contrast, TBK1 expression restricts viral replication. These results suggest that control of TBK1 by Us11 promotes HSV-1 infection.IMPORTANCE TANK binding kinase 1 plays a key role in antiviral immunity. Although multiple factors are thought to participate in this process, the picture is obscure in herpes simplex virus infection. We demonstrated that the Us11 protein of HSV-1 forms a complex with heat shock protein 90, which inactivates TANK binding kinase 1 and IFN induction. As a result, expression of the Us11 protein promotes HSV replication. These experimental data provide a new insight into the molecular network of virus-host interactions.
journal_name
J Viroljournal_title
Journal of virologyauthors
Liu X,Main D,Ma Y,He Bdoi
10.1128/JVI.00402-18subject
Has Abstractpub_date
2018-06-29 00:00:00issue
14eissn
0022-538Xissn
1098-5514pii
JVI.00402-18journal_volume
92pub_type
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