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Virology Journal
Published in: Virology Journal 1/2011

Open Access 01-12-2011 | Research

Japanese encephalitis virus co-opts the ER-stress response protein GRP78 for viral infectivity

Authors: Yi-Ping Wu, Chung-Ming Chang, Chun-Yu Hung, Meng-Chieh Tsai, Scott C Schuyler, Robert Yung-Liang Wang

Published in: Virology Journal | Issue 1/2011

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Abstract

The serum-free medium from Japanese encephalitis virus (JEV) infected Baby Hamster Kidney-21 (BHK-21) cell cultures was analyzed by liquid chromatography tandem mass spectrometry (LC-MS) to identify host proteins that were secreted upon viral infection. Five proteins were identified, including the molecular chaperones Hsp90, GRP78, and Hsp70. The functional role of GRP78 in the JEV life cycle was then investigated. Co-migration of GRP78 with JEV particles in sucrose density gradients was observed and co-localization of viral E protein with GRP78 was detected by immunofluorescence analysis in vivo. Knockdown of GRP78 expression by siRNA did not effect viral RNA replication, but did impair mature viral production. Mature viruses that do not co-fractionate with GPR78 displayed a significant decrease in viral infectivity. Our results support the hypothesis that JEV co-opts host cell GPR78 for use in viral maturation and in subsequent cellular infections.
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Metadata
Title
Japanese encephalitis virus co-opts the ER-stress response protein GRP78 for viral infectivity
Authors
Yi-Ping Wu
Chung-Ming Chang
Chun-Yu Hung
Meng-Chieh Tsai
Scott C Schuyler
Robert Yung-Liang Wang
Publication date
01-12-2011
Publisher
BioMed Central
Published in
Virology Journal / Issue 1/2011
Electronic ISSN: 1743-422X
DOI
https://doi.org/10.1186/1743-422X-8-128

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