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Infection and Immunity, July 1999, p. 3257-3266, Vol. 67, No. 7
0019-9567/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Comparative Analysis and Immunological Characterization of the Borrelia Bdr Protein Family

Wolfram R. Zückert,1,* Jürg Meyer,2 and Alan G. Barbour1,*

Departments of Microbiology & Molecular Genetics and Medicine, University of California Irvine, Irvine, California 92697,1 and Institute of Preventive Dentistry and Oral Microbiology, University of Basel Dental Center, CH-4056 Basel, Switzerland2

Received 5 February 1999/Returned for modification 17 March 1999/Accepted 12 April 1999

Multiple circular and linear plasmids of Lyme disease and relapsing fever Borrelia spirochetes carry genes for members of the Bdr (Borrelia direct repeat) protein family. To define their common and divergent attributes, we first comprehensively compared the known homologs. Bdr proteins with predicted sizes ranging from 10.7 to 30.6 kDa formed five homology groups, based on variable numbers of short direct repeats in a central domain and diverse N- and C-terminal domains. In a further characterization, Western blots were probed with rabbit antisera raised against either of two purified recombinant Bdr proteins from Borrelia burgdorferi B31. The results showed that antibodies cross-react and several Bdr paralogs 19.5 to 30.5 kDa in size are expressed by cultured strain B31 in a temperature-independent manner. In situ proteolysis, immunofluorescence, and growth inhibition assays indicated that Bdr proteins are not surface exposed. Distinct patterns of cross-reacting proteins of 17.5 to 33 kDa were also detected in other B. burgdorferi, Borrelia garinii, and Borrelia afzelii strains as well as in relapsing fever spirochetes Borrelia hermsii and Borrelia turicatae. Last, we examined whether these proteins are antibody targets during Lyme disease. Analysis of 47 Lyme disease patient sera by immunoblotting and enzyme-linked immunosorbent assays showed that 24 (51%) and 20 (43%), respectively, had detectable antibodies to one or more of the Bdr proteins. Together, these data indicate that Bdr proteins constitute a family of cross-reactive Borrelia proteins which are expressed in the course of Lyme disease and in vitro.

* Corresponding author. Mailing address: Department of Microbiology and Molecular Genetics, University of California Irvine, B240 Medical Sciences I, Irvine, CA 92697. Phone: (949) 824-3737. Fax: (949) 824-8598. E-mail for Wolfram R. Zückert: wzuecker{at}uci.edu. E-mail for Alan G. Barbour: abarbour{at}uci.edu.

Infection and Immunity, July 1999, p. 3257-3266, Vol. 67, No. 7
0019-9567/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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