DNA sequence and expression of the 36-kilodalton outer membrane protein gene of Brucella abortus.

Infection and Immunity
T A FichtL G Adams

Abstract

The cloning of the gene(s) encoding a 36-kilodalton (kDa) cell envelope protein of Brucella abortus has been previously described (T. A. Ficht, S. W. Bearden, B. A. Sowa, and L. G. Adams, Infect, Immun. 56:2036-2046, 1988). In an attempt to define the nature of the previously described duplication at this locus we have sequenced 3,500 base pairs of genomic DNA encompassing this region. The duplication represented two similar open reading frames which shared more than 85% homology at the nucleotide level but differed primarily because of the absence of 108 nucleotides from one of the two gene copies. These two genes were read from opposite strands and potentially encoded proteins which are 96% homologous. The predicted gene products were identical over the first 100 amino acids, including 22-amino-acid-long signal sequences. The amino acid composition of the predicted proteins was similar to that obtained for the Brucella porin isolated by Verstreate et al. (D. R. Verstreate, M. T. Creasy, N. T. Caveney, C. L. Baldwin, M. W. Blab, and A. J. Winter, Infect. Immun. 35:979-989, 1982) and presumably represented two copies of the porin gene, tentatively identified as omp 2a (silent) and omp 2b (expressed). The homology between the tw...Continue Reading

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