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Infection and Immunity, September 1994, p. 3633-3639, Vol. 62, No. 9
0019-9567/1994/$04.00+0     DOI:

research-article

Molecular cloning, nucleotide sequence, and occurrence of a 16.5-kilodalton outer membrane protein of Brucella abortus with similarity to pal lipoproteins.

A Tibor, V Weynants, P Denoel, B Lichtfouse, X De Bolle, E Saman, J N Limet, and J J Letesson

Laboratoire de Microbiologie et d'Immunologie, Facultés Universitaires Notre-Dame de la Paix, Belgium.

ABSTRACT

Recombinant lambda gt11 phages were selected by screening a genomic library of Brucella abortus DNA with monoclonal antibodies specific for a 16.5-kDa Brucella outer membrane protein (Omp16). The corresponding gene, named pal, was subcloned on a 0.7-kb AluI fragment. Immunoblotting confirmed the expression of a recombinant Omp16 in the transformants. DNA sequence analysis revealed an open reading frame of 168 codons. The deduced amino acid sequence agrees with an internal peptide sequence of native Omp16 and contains a potential lipoprotein signal peptide cleavage site, giving rise to a predicted mature protein of 144 amino acids. The predicted sequence of Omp16 also shows a remarkable degree of similarity to the sequences of three peptidoglycan-associated bacterial lipoproteins. In immunoblotting with a monoclonal antibody specific for Omp16, we demonstrated that Omp16 was expressed in the 34 Brucella strains tested, representing all six species and known biovars.

Infection and Immunity, September 1994, p. 3633-3639, Vol. 62, No. 9
0019-9567/1994/$04.00+0     DOI:




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