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. 1991 Feb;29(2):346–354. doi: 10.1128/jcm.29.2.346-354.1991

Genus-specific epitope on the 60-kilodalton Legionella heat shock protein recognized by a monoclonal antibody.

I Steinmetz 1, C Rheinheimer 1, I Hübner 1, D Bitter-Suermann 1
PMCID: PMC269765  PMID: 1706730

Abstract

A monoclonal antibody (MAb) immunoglobulin G2a (2125) was produced against a 60-kDa Legionella heat shock protein (HSP), recognizing a unique epitope common to all species of the genus Legionella. The antibody reacted in the immunoblot with 59 Legionella species and serogroups that were tested and showed no cross-reactivity with other bacteria, including Acinetobacter spp., Bordetella spp., Pseudomonas spp., Mycobacterium spp., and Escherichia coli. Two other MAbs (2122 and 2130) reacted with the 60-kDa Legionella protein as well but showed different cross-reactivities with other gram-negative bacteria in the same molecular mass range. The genus-specific MAb 2125 as well as the cross-reacting MAbs 2122 and 2130 were shown to be reactive with the expressed protein of the cloned gene of the 60-kDa HSP of Legionella micdadei and Legionella pneumophila. These antibodies demonstrate that Legionella-specific and nonspecific epitopes are present on this protein. A sandwich enzyme-linked immunosorbent assay (ELISA) in which the genus-specific MAb is used both as a capture antibody and as a biotinylated second antibody has been established. With this test it is possible to detect Legionella whole cells, sonicated cells, and cell fractions containing the 60-kDa HSP. The main part of the 60-kDa HSP is found in the cytoplasmic fraction. The sandwich ELISA can be used to demonstrate the increased expression of the 60-kDa protein in Legionella cells following heat shock as well as marked differences in the detection of the 60-kDa HSP on whole cells of different Legionella strains. The high specificity and sensitivity of the sandwich ELISA for sonicated cells might be very useful to screen on a genus level for Legionella cells or the 60-kDa antigen in environmental isolates or body fluids of patients.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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