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Journal of Clinical Microbiology, January 2000, p. 369-374, Vol. 38, No. 1
0095-1137/0/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Molecular Cloning and Characterization of the 120-Kilodalton Protein Gene of Ehrlichia canis and Application of the Recombinant 120-Kilodalton Protein for Serodiagnosis of Canine Ehrlichiosis

Xue-jie Yu, Jere W. McBride, C. Marcela Diaz, and David H. Walker*

Department of Pathology, WHO Collaborating Center for Tropical Diseases, University of Texas Medical Branch, Galveston, Texas 77555-0609

Received 11 December 1998/Returned for modification 2 April 1999/Accepted 24 August 1999

The 120-kDa outer membrane protein (p120) is a potential adhesin of Ehrlichia chaffeensis, and recombinant p120 is very useful for serodiagnosis of human monocytotropic ehrlichiosis. The analogous gene of p120 in Ehrlichia canis was cloned, sequenced, and expressed. Like the E. chaffeensis p120, the E. canis p120 contains tandem repeat units. However, neither the repeat number nor the amino acid sequences in the repeats are identical in the two Ehrlichia species. The repeat units are hydrophilic and by probability analysis are predicted to be surface exposed in both species. The repeat regions of the p120s of the two species have common amino acid sequences that are predicted to be surface exposed. The overall amino acid sequence of the E. canis p120 is 30% homologous to that of E. chaffeensis p120. Protein immunoblotting demonstrated that the recombinant E. canis p120 reacted with convalescent sera from dogs with canine ehrlichiosis. These results indicate that the recombinant p120 is a potential antigen for the serodiagnosis of canine ehrlichiosis.

* Corresponding author. Mailing address: Department of Pathology, 301 University Blvd., University of Texas Medical Branch, Galveston, TX 77555-0609. Phone: (409) 772-2856. Fax: (409) 772-2500. E-mail: dwalker{at}utmb.edu.

Journal of Clinical Microbiology, January 2000, p. 369-374, Vol. 38, No. 1
0095-1137/0/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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