- Development of a Chimeric Strain of Porcine Reproductive and Respiratory Syndrome Virus with an Infectious Clone and a Korean Dominant Field Strain
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Jung-Ah Lee , Nak-Hyung Lee , Sang-Won Lee , Seung-Yong Park , Chang-Seon Song , In-Soo Choi , Joong-Bok Lee
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J. Microbiol. 2014;52(4):345-349. Published online March 29, 2014
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DOI: https://doi.org/10.1007/s12275-014-4074-4
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Abstract
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The K418 chimeric virus of porcine reproductive and respiratory syndrome virus (PRRSV) was engineered by replacing the genomic region containing structure protein genes of an infectious clone of PRRSV, FL12, with the same region obtained
from a Korean dominant field strain, LMY. The K418 reached 106 TCID50/ml of viral titer with similar growth kinetics to those of parental strains and had a cross-reactive
neutralizing antibody response to field serum from the entire country. The chimeric clone pK418 can be used as a practical tool for further studying the molecular characteristics of PRRSV proteins through genetic manipulation. Furthermore,
successful construction of the K418 will allow for the development of customized vaccine candidates against PRRSV, which has evolved rapidly in Korea.
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- Antiviral Effect of Flavonol Glycosides Isolated from the Leaf of Zanthoxylum piperitum on Influenza Virus
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Song-Yi Ha , Hana Youn , Chang-Seon Song , Se Chan Kang , Jong Jin Bae , Hee Tae Kim , Kwang Min Lee , Tae Hoon Eom , In Su Kim , Jong Hwan Kwak
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J. Microbiol. 2014;52(4):340-344. Published online March 29, 2014
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DOI: https://doi.org/10.1007/s12275-014-4073-5
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Abstract
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The ethanol extract of Zanthoxylum piperitum (L.) DC. showed in vitro antiviral activity against influenza A virus. Three flavonol glycosides were isolated from the EtOAc fraction of Z. piperitum leaf by means of activity-guided chromatographic separation. Structures of isolated compounds were identified as quercetin 3-O-β-D-galactopyranoside (1), quercetin 3-O-α-L-rhamnopyranoside (2), kaempferol
3-O-α-L-rhamnopyranoside (3) by comparing their spectral data with literature values. The anti-influenza viral activity of isolates was evaluated using a plaque reduction assay against influenza A/NWS/33 (H1N1) virus. The compounds also were subjected to neuraminidase inhibition assay in influenza A/NWS/33 virus. Compounds 1-3 exhibited antiviral activity against an influenza A virus in vitro, and inhibited the neuraminidase activity at relatively high concentrations.
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