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Journal of Clinical Microbiology logoLink to Journal of Clinical Microbiology
. 1993 Aug;31(8):2141–2145. doi: 10.1128/jcm.31.8.2141-2145.1993

Characterization of an 18-kilodalton Brucella cytoplasmic protein which appears to be a serological marker of active infection of both human and bovine brucellosis.

F A Goldbaum 1, J Leoni 1, J C Wallach 1, C A Fossati 1
PMCID: PMC265711  PMID: 8370742

Abstract

Some anticytoplasmic protein monoclonal antibodies (MAbs) from mice immunized by infection with Brucella ovis cells have been obtained. One of these MAbs, BI24, was used to purify by immunoaffinity a protein with a pI of 5.6 and a molecular mass of 18 kDa. This protein was present in all of the rough and smooth Brucella species studied, but it could not be detected in Yersinia enterocolitica 09. Three internal peptides of this protein were partially sequenced; no homology with other bacterial proteins was found. The immunogenicity of the 18-kDa protein was studied with both human and bovine sera by a capture enzyme-linked immunosorbent assay system with MAb BI24.

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