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Journal of Clinical Microbiology, January 2001, p. 1-7, Vol. 39, No. 1
0095-1137/01/$04.00+0   DOI: 10.1128/JCM.39.1.1-7.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Enzyme-Linked Immunosorbent Assays for Detection of Antibodies to Ebola and Marburg Viruses Using Recombinant Nucleoproteins

Masayuki Saijo,1 Masahiro Niikura,1 Shigeru Morikawa,1,* Thomas G. Ksiazek,2 Richard F. Meyer,2 Clarence J. Peters,2 and Ichiro Kurane1

Special Pathogens Laboratory, Department of Virology 1, National Institute of Infectious Diseases, Gakuen 4-7-1, Musashimurayama, Tokyo 208-0011, Japan,1 and Special Pathogens Branch, National Center for Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia 303332

Received 3 May 2000/Returned for modification 16 August 2000/Accepted 16 October 2000

The full-length nucleoprotein (NP) of Ebola virus (EBO) was expressed as a His-tagged recombinant protein (His-EBO-NP) by a baculovirus system. Carboxy-terminal halves of NPs of EBO and Marburg virus (MBG) were expressed as glutathione S-transferase-tagged recombinant proteins in an Escherichia coli system. The antigenic regions on the NPs of EBO and MBG were determined by both Western blotting and enzyme-linked immunosorbent assay (ELISA) to be located on the C-terminal halves. The C-terminal 110 and 102 amino acids of the NPs of EBO and MBG, respectively, possess strong antigenicity. The full-length NP of EBO was strongly expressed in insect cells upon infection with the recombinant baculovirus, while expression of the full-length NP of MBG was weak. We developed an immunoglobulin G (IgG) ELISA using His-EBO-NP and the C-terminal halves of the NPs of EBO and MBG as antigens. We evaluated the IgG ELISA for the ability to detect IgG antibodies to EBO and MBG, using human sera collected from EBO and MBG patients. The IgG ELISA with the recombinant NPs showed high sensitivity and specificity in detecting EBO and MBG antibodies. The results indicate that ELISA systems prepared with the recombinant NPs of EBO and MBG are valuable tools for the diagnosis of EBO and MBG infections and for seroepidemiological field studies.

* Corresponding author. Mailing address: Special Pathogens Laboratory, Department of Virology 1, National Institute of Infectious Diseases, Gakuen 4-7-1, Musashimurayama, Tokyo 208-0011, Japan. Phone: 81-42-561-0771, ext. 791. Fax: 81-42-564-4881. E-mail: morikawa{at}nih.go.jp.

Journal of Clinical Microbiology, January 2001, p. 1-7, Vol. 39, No. 1
0095-1137/01/$04.00+0   DOI: 10.1128/JCM.39.1.1-7.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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