The nucleolar protein GLTSCR2 is required for efficient viral replication.
Glioma tumor suppressor candidate region gene 2 protein (GLTSCR2) is a nucleolar protein. In the investigation of the role of GLTSCR2 that played in the cellular innate immune response to viral infection, we found GLTSCR2 supported viral replication of rhabdovirus, paramyxovirus, and coronavirus in cells. Viral infection induced translocation of GLTSCR2 from nucleus to cytoplasm that enabled GLTSCR2 to attenuate type I interferon IFN-β and support viral replication. Cytoplasmic GLTSCR2 was able to interact with retinoic acid-inducible gene I (RIG-I) and the ubiquitin-specific protease 15 (USP15), and the triple interaction induced USP15 activity to remove K63-linked ubiquitination of RIG-I, leading to attenuation of RIG-I and IFN-β. Blocking cytoplasmic translocation of GLTSCR2, by deletion of its nuclear export sequence (NES), abrogated its ability to attenuate IFN-β and support viral replication. GLTSCR2-mediated attenuation of RIG-I and IFN-β led to alleviation of host cell innate immune response to viral infection. Our findings suggested that GLTSCR2 contributed to efficient viral replication, and GLTSCR2 should be considered as a potential target for therapeutic control of viral infection.
Key Laboratory of Zoonosis of Ministry of Agriculture, China Agricultural University, Beijing, China.
Peng
P
Wang
Key Laboratory of Zoonosis of Ministry of Agriculture, China Agricultural University, Beijing, China.
Wen
W
Meng
Key Laboratory of Zoonosis of Ministry of Agriculture, China Agricultural University, Beijing, China.
Shi-Chong
SC
Han
Key Laboratory of Zoonosis of Ministry of Agriculture, China Agricultural University, Beijing, China.
Cui-Cui
CC
Li
State Key Laboratory of Veterinary Biotechnology, the Chinese Academy of Agriculture Sciences, Harbin, China.
Xiao-Jun
XJ
Wang
Key Laboratory of Zoonosis of Ministry of Agriculture, China Agricultural University, Beijing, China.
Xiao-Jia
XJ
Wang
D002467:Cell Nucleus / Q000378:metabolism*; D017934:Coronavirus / Q000502:physiology; D003593:Cytoplasm / Q000378:metabolism; D057809:HEK293 Cells; D006367:HeLa Cells; D056945:Hep G2 Cells; D006801:Humans; D007113:Immunity, Innate; D016899:Interferon-beta / Q000378:metabolism*; D010252:Paramyxoviridae / Q000502:physiology; D012328:RNA Viruses / Q000502:physiology*; D018168:Receptors, Retinoic Acid / Q000378:metabolism*; D012209:Rhabdoviridae / Q000502:physiology; D025521:Tumor Suppressor Proteins / Q000235:genetics / Q000378:metabolism*; D064570:Ubiquitin-Specific Proteases / Q000378:metabolism*; D014779:Virus Replication
C500712:NOP53 protein, human; C437968:PLAAT4 protein, human; D018168:Receptors, Retinoic Acid; D025521:Tumor Suppressor Proteins; D016899:Interferon-beta; C579226:USP15 protein, human; D064570:Ubiquitin-Specific Proteases