A dominant antigenic epitope on SARS-CoV spike protein identified by an avain single-chain variable fragment (scFv)-variable fragment phage

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Taipei Medical University Institutional Repository > 醫學院 > 醫學系 > 微生物免疫學科 > 期刊論文 > Item 987654321/1048

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題名:	A dominant antigenic epitope on SARS-CoV spike protein identified by an avain single-chain variable fragment (scFv)-variable fragment phage
作者:	呂思潔 Lee YC;Leu SJ;Hung HC;Wu HH;Huang IJ;Hsieh WS;Chiu WT;Hsieh MS;Cheng TF;Yang YY
貢獻者:	醫學系微生物與免疫學科
日期:	2007
上傳時間:	2009-08-14 10:37:35 (UTC+8)
摘要:	Severe acute respiratory syndrome (SARS) is a newly emergent human disease, which requires rapid diagnosis and effective therapy. Among antibody sources, immunoglobulin Y (IgY) is the major antibody found in chicken eggs and can be used as an alternative to mammalian antibodies normally used in research and immunotherapy. In this study, phage-expressing chicken monoclonal scFv antibody was chosen and characterized with phage display antibody technology. Truncated fragments of SARS-CoV spike protein were cloned in pET-21 vector and expressed in BL-21 Escherichia coli (E. coli) cells. After purification, the purity of these recombinant spike proteins was examined on SDS–PAGE and their identity verified with Western blot analysis using anti-his antibodies and sera from convalescent stage SARS-CoV-infected patients. Using these bacteria-derived proteins to immunize chickens, it was found that polyclonal IgY antibodies in the egg yolk and sera were highly reactive to the immunogens, as shown by Western blot and immunocytochemical staining analysis. A phage displaying scFv library was also established from spleen B cells of immunized chicken with 5 × 107 clones. After four panning cycles, the eluted phage titer showed a 10-fold increase. In sequence analysis with chicken germline gene, five phage clones reacted, with large dissimilarities of between 31 and 62%, in the complementarity-determining regions, one dominant phage 4S1 had strong binding to fragment Se-e, located between amino acid residues 456–650 of the spike protein and this particular phage had significantly strong binding to SARS-CoV-infected Vero E6 cells. Based on the results, we conclude that generating specific scFv-expressing phage binders with the phage display system can be successfully achieved and that this knowledge can be applied in clinical or academic research.
關聯:	Veterinary Immunology and Immunopathology.(117):75-85.
資料類型:	article
顯示於類別:	[微生物免疫學科] 期刊論文

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