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Infection and Immunity, July 1999, p. 3533-3541, Vol. 67, No. 7
0019-9567/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Identification and Characterization of TspA, a Major CD4+ T-Cell- and B-Cell-Stimulating Neisseria-Specific Antigen

Goksel Kizil,1 Ian Todd,1 Mustafa Atta,1 S. Peter Borriello,2 Kamel Ait-Tahar,1 and Dlawer A. A. Ala'Aldeen1,*

Meningococcal Research Group, Divisions of Microbiology and Immunology, School of Clinical Laboratory Sciences, University of Nottingham Faculty of Medicine and Health Sciences, University Hospital, Nottingham NG7 2UH,1 and Central Public Health Laboratory, London NW9 5HT,2 United Kingdom

Received 9 December 1998/Returned for modification 16 February 1999/Accepted 6 April 1999

In search for novel T-cell immunogens involved in protection against invasive meningococcal disease, we screened fractionated proteins of Neisseria meningitidis (strain SD, B:15:P1.16) by using peripheral blood mononuclear cells (PBMCs) and specific T-cell lines obtained from normal individuals and patients convalescing from N. meningitidis infection. Proteins of iron-depleted meningococci produced higher PBMC proliferation indices than proteins of iron-replete organisms, indicating that iron-regulated proteins are T-cell immunogens. Insoluble proteins of the iron-depleted cells, which produced better T-cell stimulation than soluble ones, were fractionated by using sodium dodecyl sulfate-polyacrylamide gels and recovered as five fractions (F1 to F5) corresponding to decreasing molecular weight ranges. The proteins were purified (by elution and precipitation) or electroblotted onto nitrocellulose membranes (dissolved and precipitated) before use in further T-cell proliferation assays. One of the fractions (F1), containing high-molecular-mass proteins (>130 kDa), consistently showed the strongest T-cell proliferation responses in all of the T-cell lines examined. F1 proteins were subdivided into four smaller fractions (F1A to F1D) which were reexamined in T-cell proliferation assays, and F1C induced the strongest responses in patients' T-cell lines. Rabbit polyclonal antibodies to F1C components were used to screen a genomic expression library of N. meningitidis. Two major clones (C1 and C24) of recombinant meningococcal DNA were identified and fully sequenced. Sequence analysis showed that C24 (1,874 bp) consisted of a single open reading frame (ORF), which was included in clone C1 (2,778 bp). The strong CD4+ T-cell-stimulating effect of the polypeptide product of this ORF (named TspA) was confirmed, using a patient T-cell line. Immunogenicity for B cells was confirmed by showing that convalescent patients' serum antibodies recognized TspA on Western blots. Additional genetic sequence downstream of C24 was obtained from the meningococcal genomic sequence database (Sanger Centre), enabling the whole gene of 2,761 bp to be reconstructed. The DNA and deduced amino acid sequence data for tspA failed to show significant homology to any known gene, except for a corresponding (uncharacterized) gene in Neisseria gonorrhoeae genome sequences, suggesting that tspA is unique to the genus Neisseria. The DNA and deduced amino acid sequence of the second ORF of clone C1 showed significant homology to gloA, encoding glyoxalase I enzyme, of Salmonella typhimurium and Escherichia coli. Thus, we have identified a novel neisserial protein (TspA) which proved to be a strong CD4+ T-cell- and B-cell-stimulating immunogen with potential as a possible vaccine candidate.

* Corresponding author. Mailing address: Meningococcal Research Group, Division of Microbiology, School of Clinical Laboratory Sciences, A Floor West Block, University Hospital, Nottingham NG7 2UH, United Kingdom. Phone: (44) (115) 924-9924, ext. 44952. Fax: (44) (115) 970 9233. E-mail: daa{at}nottingham.ac.uk.

Infection and Immunity, July 1999, p. 3533-3541, Vol. 67, No. 7
0019-9567/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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