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J. Microbiol. Biotechnol. 1998; 8(4): 369-377

Published online August 28, 1998

Copyright © The Korean Society for Microbiology and Biotechnology.

cDNA Cloning and Expression of Human Rotavirus Outer Capsid Protein VP7 in Insect Cells

Kang, Du kyung , Ki wan Kim , Pyeung-hyun Kim 1, Seung yong Seoung 2, Yong hee Kim 2, Ick chan Kwon 2, Seo young Jeong 2, Eui-yeol Choi 3, Kyung mee Lee 3, Hyun sook Kim 4, Eui chong Kim 5, Sai ick Joo 5 and Jai myung Yang 5*

Department of Life Science, Sogang Unversity, Seoul 121-742, Korea, 1Department of Microbiology, Kangwon National Unmiversity, Chunchon 200-701, Korea, 2Biomedical Research Center, KIST, Seoul 136-791, Korea, 3Department of Genetic Engineering, Hallym University, Chunchon 200-702, Korea, 4Department of Clinical Pathology, College of Medicine, Yonsei University, Seoul 120-752, 5Department of Clinical Pathology, College of Medicine, Seoul national Unversity, Seoul 110-744, Korea

Abstract

Rotavirus is a major cause of severe gastroenteritis in young children and animals throughout the world. The VP7 of rotavirus is thought to induce the synthesis of neutralizing antibodies and to be responsible for determining viral serotypes. The cDNA coding for the VP7 capsid protein of human rotavirus, obtained from Korean patients (HRV-Y14), was cloned and its nucleotide sequence was determined. Comparative analysis of the nucleotide sequences between VP7 of Y14 and that of other foreign isolates showed $92.7~95.2\%$ homology to G1 serotypes (RV-4, KU, K8, WA), $74.2\%$ homolgy to G2 serotype HU-5, $76.4\%$ homology to G3 serotype SA-11, and $77.6\%$ homology to G4 serotype A01321. These data suggest that HRV-Y14 can be classified as a G1 serotype. cDNA coding for VP7 of HRV-YI4 was subcloned into the baculovirus vector and the VP7 glycoprotein was expressed in insect cells. The expressed proteins in Sf9 cell extract and tissue culture fluid were separated on SDS-PAGE, and Western blot analysis with monoclonal antibody raised against the synthetic peptide containing 21 amino acids within the VP7 conserved region was performed. The molecular weight of recombinant VP7 was estimated to be 36 kDa which is about the same size as the native VP7. Addition of tunicamycin in the culture media caused a reduction of the molecular weight of the recombinant VP7 indicating that the expressed protein was glycosylated.

Keywords: Rotavirus, VP7, homology, baculovirus, glycosylation