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J. Bacteriol., 06 1995, 3036-3044, Vol 177, No. 11
M Theisen, M Borre, MJ Mathiesen, B Mikkelsen, AM Lebech and K Hansen
The genes coding for outer surface protein OspC from 22 Borrelia
burgdorferi strains isolated from patients with Lyme borreliosis were
cloned and sequenced. For reference purposes, the 16S rRNA genes from 17 of
these strains were sequenced after being cloned. The deduced OspC amino
acid sequences were aligned with 12 published OspC sequences and revealed
the presence of 48 conserved amino acids. On the basis of the alignment,
OspC could be divided into an amino-terminal relatively conserved region
and a relatively variable region in the central portion. The distance tree
obtained divided the ospC sequences into three groups. The first group
contained ospC alleles from all (n = 13) sensu stricto strains, the second
group contained ospC alleles from seven Borrelia afzelii strains, and the
third group contained ospC alleles from five B. afzelii and all (n = 9)
Borrelia garinii strains. The ratio of the mean number of synonymous (dS)
and nonsynonymous (dN) nucleotide substitutions per site calculated for B.
burgdorferi sensu stricto, B. garinii, and B. afzelii ospC alleles
suggested that the polymorphism of OspC is due to positive selection
favoring diversity at the amino acid level in the relatively variable
region. On the basis of the comparison of 16S rRNA gene sequences, Borrelia
hermsii is more closely related to B. afzelii than to B. burgdorferi sensu
stricto and B. garinii. In contrast, the phylogenetic tree obtained for the
B. hermsii variable major protein, Vmp33, and 18 OspC amino acid sequences
suggested that Vmp33 and OspC from B. burgdorferi sensu stricto strains
share a common evolutionary origin.
Copyright © 1995, American Society for Microbiology
Evolution of the Borrelia burgdorferi outer surface protein OspC
Statens Seruminstitut, Department of Infection-Immunology, Copenhagen, Denmark.
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