Abstract
The avian influenza virus (AIV) PA protein contributes to viral replication and pathogenicity; however, its interaction with innate immunity is not well understood. Here, we report that the H5 subtype AIV PA protein strongly suppresses host antiviral defense by interacting with and degrading a key protein in interferon (IFN) signaling, Janus kinase 1 (JAK1). Specifically, the AIV PA protein catalyzes the K48-linked polyubiquitination and degradation of JAK1 at lysine residue 249. Importantly, the AIV PA protein harboring 32T/550L degrades both avian and mammalian JAK1, while the AIV PA protein with residues 32M/550I degrades avian JAK1 only. Furthermore, the residues 32T/550L in PA protein confer optimum polymerase activity and AIV growth in mammalian cells. Notably, the replication and virulence of the AIV PA T32M/L550I mutant are attenuated in infected mice. Collectively, these data reveal an interference role for H5 subtype AIV PA protein in host innate immunity, which can be targeted for the development of specific and effective anti-influenza therapeutics.
Funder
the National Key R&D Project
the National Natural Science Foundation of China
the Jiangsu Provincial Natural Science Fund for Excellent Young Scholars
Jiangsu Province University Outstanding Science and Technology Innovation Team Project
the Postgraduate Research&Practice Innovation Program of Jiangsu Province
the Agricultural Science and Technology Independent Innovation Fund of Jiangsu Province
Yangzhou University International Academic Exchange Fund
the 2020 Interdisciplinary Project of Yangzhou University Veterinary Special Zone
the Priority Academic Program Development of Jiangsu Higher Education
the Jiangsu Qinglan Project
Publisher
Public Library of Science (PLoS)
Subject
Virology,Genetics,Molecular Biology,Immunology,Microbiology,Parasitology
Cited by
1 articles.
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