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. 1990 Sep;58(9):2912–2918. doi: 10.1128/iai.58.9.2912-2918.1990

Identification of mip-like genes in the genus Legionella.

N P Cianciotto 1, J M Bangsborg 1, B I Eisenstein 1, N C Engleberg 1
PMCID: PMC313586  PMID: 2387627

Abstract

The mip gene of Legionella pneumophila serogroup 1 strain AA100 encodes a 24-kilodalton surface protein (Mip) and enhances the abilities of L. pneumophila to parasitize human macrophages and to cause pneumonia in experimental animals. To determine whether this virulence factor is conserved in the genus Legionella, a large panel of Legionella strains was examined by Southern hybridization and immunoblot analyses for the presence and expression of mip-related sequences. Strains representing all 14 serogroups of L. pneumophila contained a mip gene and expressed a 24-kilodalton Mip protein. Although the isolates of the 29 other Legionella species did not hybridize with mip DNA probes under high-stringency conditions, they did so at reduced stringency. In support of the notion that these strains possess mip-like genes, these species each expressed a protein (24 to 31 kilodaltons in size) that reacted with specific Mip antisera. Moreover, the cloned mip analog from Legionella micdadei encoded the cross-reactive protein. Thus, mip is conserved and specific to L. pneumophila, but mip-like genes are present throughout the genus, perhaps potentiating the intracellular infectivity of all Legionella species.

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