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Structural basis for STAT2 suppression by flavivirus NS5.

Abstract：

:Suppressing cellular signal transducers of transcription 2 (STAT2) is a common strategy that viruses use to establish infections, yet the detailed mechanism remains elusive, owing to a lack of structural information about the viral-cellular complex involved. Here, we report the cryo-EM and crystal structures of human STAT2 (hSTAT2) in complex with the non-structural protein 5 (NS5) of Zika virus (ZIKV) and dengue virus (DENV), revealing two-pronged interactions between NS5 and hSTAT2. First, the NS5 methyltransferase and RNA-dependent RNA polymerase (RdRP) domains form a conserved interdomain cleft harboring the coiled-coil domain of hSTAT2, thus preventing association of hSTAT2 with interferon regulatory factor 9. Second, the NS5 RdRP domain also binds the amino-terminal domain of hSTAT2. Disruption of these ZIKV NS5-hSTAT2 interactions compromised NS5-mediated hSTAT2 degradation and interferon suppression, and viral infection under interferon-competent conditions. Taken together, these results clarify the mechanism underlying the functional antagonism of STAT2 by both ZIKV and DENV.

journal_name

Nat Struct Mol Biol

journal_title

Nature structural & molecular biology

authors

Wang B,Thurmond S,Zhou K,Sánchez-Aparicio MT,Fang J,Lu J,Gao L,Ren W,Cui Y,Veit EC,Hong H,Evans MJ,O'Leary SE,García-Sastre A,Zhou ZH,Hai R,Song J

doi

10.1038/s41594-020-0472-y

subject

Has Abstract

pub_date

2020-10-01 00:00:00

pages

875-885

issue

10

eissn

1545-9993

issn

1545-9985

pii

10.1038/s41594-020-0472-y

journal_volume

27

pub_type

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