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Clinical and Vaccine Immunology, May 2006, p. 594-597, Vol. 13, No. 5
1071-412X/06/$08.00+0     doi:10.1128/CVI.13.5.594-597.2006
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

Production of an Anti-Severe Acute Respiratory Syndrome (SARS) Coronavirus Human Monoclonal Antibody Fab Fragment by Using a Combinatorial Immunoglobulin Gene Library Derived from Patients Who Recovered from SARS

Department of Medical Microbiology and Parasitology, Fudan University School of Medicine,¹ Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China,² Van Andel Research Institute, Grand Rapids, Michigan,³ Department of Infectious Diseases, Tokai University School of Medicine, Isehara, Japan⁴

Received 27 July 2005/ Returned for modification 17 October 2005/ Accepted 24 February 2006

A combinatorial human immunoglobulin gene library was constructed from the peripheral lymphocytes of two patients who recovered from severe acute respiratory syndrome (SARS). The library was screened for the production of Fab antibody fragments to a recombinant spike protein of SARS-associated coronavirus (SARS-CoV). One Fab clone, AS3-3, reacted with the spike protein in an enzyme-linked immunosorbent assay. The dissociation constant of AS3-3 was 1.98 x 10^–8 M. Immunofluorescent microscopy revealed that it reacted with SARS-CoV-infected cells. The library seems to be a potent tool for the production of human antibodies to SARS-CoV.

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