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Journal of Clinical Microbiology, Jan 1997, 86-91, Vol 35, No. 1
RD Gilmore Jr, KJ Kappel and BJ Johnson
Antibodies against a 35-kDa antigen of Borrelia burgdorferi are detectable
in the serum of about half of patients with early Lyme disease. The gene
encoding this antigen was isolated from a genomic library of B. burgdorferi
B31 (low passage), and full-length expression of the recombinant gene
product was achieved in Escherichia coli. Antiserum raised against the
recombinant protein was reactive with a B. burgdorferi protein of the same
molecular size as the diagnostic 35-kDa antigen cited in an earlier study
of criteria for the sero-diagnosis of early Lyme disease. Also, the
recombinant protein was reactive with serum from patients with early Lyme
disease who were seropositive for the 35-kDa antigen. DNA sequence analysis
of the gene indicated an open reading frame of 909 bp encoding a protein
with a calculated molecular mass of 34.3 kDa. This gene did not possess the
usual initiation codon ATG but rather probably used a TTG codon. The
deduced amino acid sequence of the N terminus exhibited a motif similar to
that for signal peptides of lipoproteins. Southern blotting revealed a
chromosomal location for this gene; and it was specific for B. burgdorferi,
B. afzellii, and B. garinii but not for B. hermsii, B. coriaciae, or B.
turicatae.
Copyright © 1997 by the American Society for Microbiology. All rights reserved.
Molecular characterization of a 35-kilodalton protein of Borrelia burgdorferi, an antigen of diagnostic importance in early Lyme disease
National Center for Infectious Diseases, Centers for Disease Control and Prevention, Fort Collins, Colorado 80521, USA. rbg9@cidvbil.em.cdc.gov
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