Publication: Fusion protein of Salmonella typhi flagellin as antigen for diagnosis of typhoid fever
Issued Date
1994-01-01
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ISSN
0125877X
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2-s2.0-0028110170
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Mahidol University
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SCOPUS
Bibliographic Citation
Asian Pacific Journal of Allergy and Immunology. Vol.12, No.1 (1994), 21-25
Suggested Citation
T. Sukosol, S. Sarasombath, S. Songsivilai, P. Ekpo, B. Rungpitarangsi, T. Pang Fusion protein of Salmonella typhi flagellin as antigen for diagnosis of typhoid fever. Asian Pacific Journal of Allergy and Immunology. Vol.12, No.1 (1994), 21-25. Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/9592
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Title
Fusion protein of Salmonella typhi flagellin as antigen for diagnosis of typhoid fever
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Abstract
We previously established the specific 52 kDa antigen of Salmonella typhi, detected by our monoclonal antibodies, which was a flagellin protein. Comparison of the nucleotide sequences of phase-1 flagellin of Salmonella species available through GenBank database showed high homology at both ends of the genes with lower degree of homology in the middle portion which contained the antigenically variable regions. Thus, proteins from the central regions of flagellin genes should be species specific and could be used as specific antigens for the immunodiagnostic tests. In this report, recombinant protein derived from the central region of S. typhi flagellin was produced as a fusion protein with glutathione-S-transferase. This fusion protein was used as specific S. typhi antigen for the immunodiagnostic test to detect IgM antibodies in sera using enzyme-linked immunosorbent assay. The sensitivity, specificity, accuracy, positive predictive value and negative predictive value of this test were 53.5, 98.0, 91.5, 82.1 and 92.4%, respectively.