- Methyltransferase of a cell culture-adapted hepatitis E inhibits the MDA5 receptor signaling pathway
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Jinjong Myoung , Jeong Yoon Lee , Kang Sang Min
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J. Microbiol. 2019;57(12):1126-1131. Published online November 22, 2019
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DOI: https://doi.org/10.1007/s12275-019-9478-8
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Abstract
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Hepatitis E virus (HEV) is a causative agent of acute hepatitis
and jaundice. The number of human infections is approximated
to be over 20 million cases per year. The transmission
is mainly via the fecal-oral route and contaminated water and
food are considered to be a major source of infection. As a
mouse model is not available, a recent development of a cell
culture-adapted HEV strain (47832c) is considered as a very
important tools for molecular analysis of HEV pathogenesis
in cells. Previously, we demonstrated that HEV-encoded methyltransferase
(MeT) encoded by the 47832c strain inhibits
MDA5- and RIG-I-mediated activation of interferon β (IFN-β)
promoter. Here, we report that MeT impairs the phosphorylation
and activation of interferon regulatory factor 3 and the
p65 subunit of NF-κB in a dose-dependent manner. In addition,
the MeT encoded by the 47832c, but not that of HEV
clinical or field isolates (SAR-55, Mex-14, KC-1, and ZJ-1),
displays the inhibitory effect. A deeper understanding of MeTmediated
suppression of IFN-β expression would provide
basis of the cell culture adaptation of HEV.
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Citations
Citations to this article as recorded by 
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Sojung Bae, Jeong Yoon Lee, Jinjong Myoung Journal of Microbiology and Biotechnology.2020; 30(12): 1801. CrossRef - Zika Virus-Encoded NS2A and NS4A Strongly Downregulate NF-κB Promoter Activity
Jeong Yoon Lee, Thi Thuy Ngan Nguyen, Jinjong Myoung Journal of Microbiology and Biotechnology.2020; 30(11): 1651. CrossRef
- Middle East respiratory syndrome coronavirus-encoded ORF8b strongly antagonizes IFN-β promoter activation: its implication for vaccine design
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Jeong Yoon Lee , Sojung Bae , Jinjong Myoung
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J. Microbiol. 2019;57(9):803-811. Published online August 27, 2019
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DOI: https://doi.org/10.1007/s12275-019-9272-7
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Abstract
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Middle East respiratory syndrome coronavirus (MERS-CoV)
is a causative agent of severe-to-fatal pneumonia especially
in patients with pre-existing conditions, such as smoking and
chronic obstructive pulmonary disease (COPD). MERS-CoV
transmission continues to be reported in the Saudi Arabian
Peninsula since its discovery in 2012. However, it has rarely
been epidemic outside the area except one large outbreak
in South Korea in May 2015. The genome of the epidemic
MERS-CoV isolated from a Korean patient revealed its homology
to previously reported strains. MERS-CoV encodes
5 accessory proteins and generally, they do not participate
in the genome transcription and replication but rather are involved
in viral evasion of the host innate immune responses.
Here we report that ORF8b, an accessory protein of MERSCoV,
strongly inhibits both MDA5- and RIG-I-mediated activation
of interferon beta promoter activity while downstream
signaling molecules were left largely unaffected. Of
note, MDA5 protein levels were significantly down-regulated
by ORF8b and co-expression of ORF4a and ORF4b. These
novel findings will facilitate elucidation of mechanisms of
virus-encoded evasion strategies, thus helping design rationale
antiviral countermeasures against deadly MERS-CoV
infection.
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