title: Characterization of a Legionella micdadei mip mutant.
abstract: The pathogenesis of Legionella micdadei is dependent upon its ability to infect alveolar phagocytes. To better understand the basis of intracellular infection by this organism, we examined the importance of its Mip surface protein. In Legionella pneumophila, Mip promotes infection of both human macrophages and freshwater protozoa. Southern hybridization and immunoblot analyses demonstrated that mip sequences were present and expressed within a panel of virulent L. micdadei strains. Using allelic exchange mutagenesis, we then constructed an L. micdadei strain that completely and specifically lacked Mip. Although unimpaired in its ability to grow in bacteriologic media, this Mip mutant was defective in its capacity to infect U937 cells, a human macrophage-like cell line. Most significantly, the Mip- organism displayed a 24-fold reduction in survivability immediately after its entry into the phagocyte. Similarly, the mutant was less able to parasitize Hartmannella amoebae. Taken together, these data argue that Mip specifically potentiates intracellular growth by L. micdadei.
authors.affiliation: Department of Microbiology-Immunology, Northwestern University, Chicago, Illinois 60611, USA.
authors.forename: W A
authors.initials: WA
authors.lastname: O'Connell
authors.forename: J M
authors.initials: JM
authors.lastname: Bangsborg
authors.forename: N P
authors.initials: NP
authors.lastname: Cianciotto
mesh_terms: D000818:Animals; D001426:Bacterial Proteins / Q000235:genetics*; D002460:Cell Line; D003588:Cytopathogenic Effect, Viral; D004269:DNA, Bacterial / Q000235:genetics; D005798:Genes, Bacterial / Q000235:genetics; D006249:Hartmannella / Q000382:microbiology; D020104:Immunophilins; D007875:Legionella / Q000235:genetics* / Q000254:growth & development / Q000472:pathogenicity; D008264:Macrophages / Q000382:microbiology; D008565:Membrane Proteins / Q000235:genetics*; D016296:Mutagenesis; D019696:Peptidylprolyl Isomerase
chemical_list: D001426:Bacterial Proteins; D004269:DNA, Bacterial; D008565:Membrane Proteins; D020104:Immunophilins; C512922:Mip protein, Legionella pneumophila; D019696:Peptidylprolyl Isomerase