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Infection and Immunity, October 2007, p. 4900-4908, Vol. 75, No. 10
0019-9567/07/$08.00+0     doi:10.1128/IAI.00041-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.

Ehrlichia canis gp200 Contains Dominant Species-Specific Antibody Epitopes in Terminal Acidic Domains{triangledown}

Kimberly A. Nethery,1 C. Kuyler Doyle,1 Xiaofeng Zhang,1 and Jere W. McBride1,2,3,4*

Departments of Pathology,1 Microbiology and Immunology,2 Center for Biodefense and Emerging Infectious Diseases,3 Sealy Center for Vaccine Development, University of Texas Medical Branch, Galveston, Texas 77555-06094

Received 9 January 2007/ Returned for modification 19 March 2007/ Accepted 27 July 2007

Species-specific antibody epitopes within several major immunoreactive protein orthologs of Ehrlichia species have recently been identified and molecularly characterized. In this study, dominant B-cell epitopes within the acidic (pI 5.35) ankyrin repeat-containing 200-kDa major immunoreactive protein (gp200) of Ehrlichia canis were defined. The E. canis gp200 gene (4,263 bp; 1,421 amino acids) was cloned and expressed as four (N-terminal, 1,107 bp; N-internal, 910 bp; C-internal, 1,000 bp; and C-terminal, 1,280 bp) overlapping recombinant proteins. The N-terminal, C-internal, and C-terminal polypeptides (369, 332, and 426 amino acids, respectively) were strongly recognized by antibody, and the major epitope(s) in these polypeptides was mapped to four polypeptide regions (40 to 70 amino acids). Smaller overlapping recombinant polypeptides (14 to 15 amino acids) spanning these regions identified five strongly immunoreactive species-specific epitopes that exhibited conformational dependence. The majority of the epitopes (four) were located in two strongly acidic (pI 4 to 4.9) domains in the distal N- and C-terminal regions of the protein flanking the centralized ankyrin domain-containing region. The amino acid content of the epitope-containing domains included a high proportion of strongly acidic amino acids (glutamate and aspartate), and these domains appear to have important biophysical properties that influence the antibody response to gp200.

* Corresponding author. Mailing address: Department of Pathology, University of Texas Medical Branch, Galveston, TX 77555-0609. Phone: (409) 747-2498. Fax: (409) 747-2455. E-mail: jemcbrid{at}utmb.edu

{triangledown} Published ahead of print on 6 August 2007.

Editor: V. J. DiRita

Infection and Immunity, October 2007, p. 4900-4908, Vol. 75, No. 10
0019-9567/07/$08.00+0     doi:10.1128/IAI.00041-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.



This article has been cited by other articles:

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