UBXN3B positively regulates STING-mediated antiviral immune responses

Long Yang (), Leilei Wang, Harshada Ketkar, Jinzhu Ma, Guang Yang, Shuang Cui, Tingting Geng, Dana G. Mordue, Toyoshi Fujimoto, Gong Cheng, Fuping You, Rongtuan Lin, Erol Fikrig () and Penghua Wang ()
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Long Yang: New York Medical College
Leilei Wang: New York Medical College
Harshada Ketkar: New York Medical College
Jinzhu Ma: New York Medical College
Guang Yang: Jinan University
Shuang Cui: Peking University Health Science Center
Tingting Geng: New York Medical College
Dana G. Mordue: New York Medical College
Toyoshi Fujimoto: Nagoya University Graduate School of Medicine
Gong Cheng: Tsinghua University
Fuping You: Peking University Health Science Center
Rongtuan Lin: McGill University
Erol Fikrig: Yale University School of Medicine
Penghua Wang: New York Medical College

Nature Communications, 2018, vol. 9, issue 1, 1-12

Abstract: Abstract The ubiquitin regulatory X domain-containing proteins (UBXNs) are likely involved in diverse biological processes. Their physiological functions, however, remain largely unknown. Here we present physiological evidence that UBXN3B positively regulates stimulator-of-interferon genes (STING) signaling. We employ a tamoxifen-inducible Cre-LoxP approach to generate systemic Ubxn3b knockout in adult mice as the Ubxn3b-null mutation is embryonically lethal. Ubxn3b−/−, like Sting−/− mice, are highly susceptible to lethal herpes simplex virus 1 (HSV-1) and vesicular stomatitis virus (VSV) infection, which is correlated with deficient immune responses when compared to Ubxn3b+/+ littermates. HSV-1 and STING agonist-induced immune responses are also reduced in several mouse and human Ubxn3b−/− primary cells. Mechanistic studies demonstrate that UBXN3B interacts with both STING and its E3 ligase TRIM56, and facilitates STING ubiquitination, dimerization, trafficking, and consequent recruitment and phosphorylation of TBK1. These results provide physiological evidence that links the UBXN family with antiviral immune responses.

Date: 2018
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DOI: 10.1038/s41467-018-04759-8

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