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A KDEL Retrieval System for ER-Golgi Transport of Japanese Encephalitis Viral Particles

Department of Biomedical Sciences and Molecular Medicine Research Center, Chang Gung University, Taoyuan 33302, Taiwan
Graduate Institute of Biomedical Sciences, College of Medicine, Chang Gung University, Taoyuan 33302, Taiwan
Department of Food Science and Nutrition, Meiho University, Pingtung 91202, Taiwan
Division of Pediatric Infectious Diseases, Department of Pediatrics, Chang Gung Memorial and Children’s Hospital, Linkuo 33375, Taiwan
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Andrew Tai
Viruses 2016, 8(2), 44;
Received: 19 November 2015 / Revised: 22 January 2016 / Accepted: 27 January 2016 / Published: 5 February 2016
(This article belongs to the Special Issue Host Membranes and the Viral Infection Cycle)
PDF [4395 KB, uploaded 5 February 2016]


Evidence has emerged that RNA viruses utilize the host secretory pathway for processing and trafficking mature viral particles and for exiting the infected cells. Upon completing the complex assembly process, the viral particles take advantage of the cellular secretory trafficking machinery for their intracellular trafficking toward the Golgi organelle and budding or export of virions. In this study, we showed that Japanese encephalitis virus (JEV)-induced extracellular GRP78 contains no KDEL motif using an anti-KDEL-specific antibody. Overexpression of the KDEL-truncated GRP78 in the GPR78 knocked down cells significantly reduced JEV infectivity, suggesting that the KDEL motif is required for GRP78 function in the release of JE viral particles. In addition, we demonstrated the KDELR protein, an ER-Golgi retrieval system component, is associated with viral envelope proteins and is engaged in the subcellular localization of viral particles in Golgi. More importantly, accumulation of intracellular virions was observed in the KDELR knocked down cells, indicating that the KDELR protein mediated the intracellular trafficking of JE viral particles. Altogether, we demonstrated that intracellular trafficking of JE assembled viral particles was mediated by the host ER-Golgi retrieval system prior to exit by the secretory pathway. View Full-Text
Keywords: Japanese encephalitis virus; GRP78; KDEL receptor; ER-Golgi retrieval; viral particles Japanese encephalitis virus; GRP78; KDEL receptor; ER-Golgi retrieval; viral particles

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Wang, R.Y.; Wu, Y.-J.; Chen, H.-S.; Chen, C.-J. A KDEL Retrieval System for ER-Golgi Transport of Japanese Encephalitis Viral Particles. Viruses 2016, 8, 44.

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