Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0023241 (Legionella)
 6,990 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The region flanking the transposon in a Tn1545-induced lecithinase-negative mutant of Listeria monocytogenes EGD was cloned and sequenced. The transposon had inserted in ORF D, the open reading frame previously identified downstream from hlyA, the gene encoding listeriolysin O. The complete sequence of ORF D from strain EGD has been determined as well as that of two other strains: LO28, a clinical isolate; and LM8, an epidemic strain. ORF D is 1,533 bp long and encodes a protein highly homologous to metalloproteases of bacilli, Serratia sp., Legionella pneumophila, and Pseudomonas aeruginosa. It was renamed prtA. Northern RNA blot analysis indicated that prtA is the first gene of a 6-kb operon, suggesting that the lecithinase-negative phenotype of the mutant might be due to a polar effect of the transposon insertion.
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PMID:Identification of a new operon involved in Listeria monocytogenes virulence: its first gene encodes a protein homologous to bacterial metalloproteases. 170 39

The gene encoding a protein that reacted with antibodies specific for Legionella pneumophila macrophage infectivity potentiator (LpMip) was cloned from Coxiella burnetii, the obligate intracellular rickettsia that causes Q fever in humans. Nucleotide sequencing analysis revealed an ORF encoding a gene product of 230 amino acids with a molecular mass of 25.5 kDa and a predicted pI of 10.7. The predicted amino acid sequence from the ORF shows similarity with Mip/Mip-like proteins of Legionella (46%) and Chlamydia (30%). Moreover, like LpMip, the amino acid sequence of the C terminus of this protein has over 35% identity to prokaryotic and eukaryotic FK506-binding proteins (FKBPs) that belong to a superfamily of immunophilins and are peptidyl-prolyl cis-trans isomerases (PPIases). When overproduced in Escherichia coli, the C. burnetii protein also exhibited PPIase activity. Taken together, these results demonstrate that C. burnetii encodes a Mip analogue (CbMip). A putative leader peptide at the N terminus of CbMip was detected by computer analysis. Furthermore, TnphoA mutagenesis demonstrated that in E. coli CbMip was secreted. In view of the role of Mip/Mip-like proteins in the pathogenesis of Legionella and Chlamydia, CbMip may be a C. burnetii virulence factor.
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PMID:Molecular cloning of a Coxiella burnetii gene encoding a macrophage infectivity potentiator (Mip) analogue. 853 14

Transposon mutagenesis was used to identify a new locus required for twitching motility in Pseudomonas aeruginosa. Four Tn5-B21 mutants which lacked twitching motility and a fifth which exhibited impaired motility were found to map to the same KPN:I restriction fragment at approximately 40 min on the P. aeruginosa genome. Cloning and sequencing studies showed that all five transposon insertions occurred within the same 2.8 kb ORF, which was termed fimV. The product of this gene has a putative peptidoglycan-binding domain, predicted transmembrane domains, a highly acidic C terminus and anomalous electrophoretic migration, indicating unusual primary or secondary structure. The P. aeruginosa genome also possesses a paralogue of fimV. Homologues of fimV were also found in the sequenced genomes of the other type-IV-fimbriated bacteria Neisseria gonorrhoeae, Neisseria meningitidis, Legionella pneumophila and Vibrio cholerae, but not in those of other bacteria which lack type IV fimbriae. A fimV homologue was also found in the genome sequence of Shewanella putrefaciens, along with many other homologues of type IV fimbrial genes, indicating that this bacterium is also likely to produce type IV fimbriae. Wild-type twitching motility was restored to fimV mutants by complementation in a dosage-dependent manner. Overexpression of fimV resulted in an unusual phenotype where the cells were massively elongated and migrated in large convoys at the periphery of the colony. It is suggested that FimV may be involved in remodelling of the peptidoglycan layer to enable assembly of the type IV fimbrial structure and machinery.
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PMID:Identification of a novel gene, fimV, involved in twitching motility in Pseudomonas aeruginosa. 1084 11

The genome of the bacterium Xylella fastidiosa contains four ORFs (XF2721, XF2725, XF2739 and XF0295) related to the restriction modification type I system, ordinarily named R-M. This system belongs to the DNA immigration control region (ICR). Each ORF is related to different operon structures, which are homologues among themselves and with subunit Hsd R from the endonuclease coding genes. In addition, these ORFs are highly homologous to genes in Pseudomonas aeruginosa, Methylococcus capsulatus str. Bath, Legionella pneumophila, Helicobacter pylori, Xanthomonas oryzae pv. Oryzae and Silicibacter pomeroyi, as well as to genes from X. fastidiosa strains that infect grapevine, almond and oleander plants. This study was carried out on R-M ORFs from forty-three X. fastidiosa strains isolated from citrus, coffee, grapevine, periwinkle, almond and plum trees, in order to assess the genetic diversity of these loci through PCR-RFLP. PCR-RFLP analysis of the four ORFs related to the R-M system from these strains enabled the detection of haplotypes for these loci. When the haplotypes were defined, wide genetic diversity and a large range of similar strains originating from different hosts were observed. This analysis also provided information indicating differences in population genetic structures, which led to detection of different levels of gene transfer among the groups of strains.
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PMID:Strain variability in the DNA immigration control region (ICR) of Xylella fastidiosa. 1612 7

Approximately 85% of cases of Legionnaires' disease are caused by Legionella pneumophila serogroup 1. In this study, we analyzed the distribution of lag-1 alleles, ORF 7 and ORF 8 genes of lipopolysaccharide (LPS) and sequence-based types of 616 L. pneumophila serogroup 1 strains isolated in Japan (206 clinical, 225 environmental) and China (13 clinical and 172 environmental). The lag-1 gene was harbored by significantly more of the clinical isolates compared with the environmental isolates (90.3 vs. 19.1% and 61.6 vs. 3.0%, respectively; both P < 0.001). ORF 7 genes were detected in 51.0% of Japanese clinical and 36.0% of Japanese environmental (P = 0.001) isolates, as well as 15.3% of Chinese clinical and 9.9% of Chinese environmental isolates (P = 0.544). ORF 8 genes were detected in 12.1% of Japanese clinical and 5.8% of Japanese environmental (P = 0.017) isolates, as well as 7.7% of Chinese clinical and 3.4% of Chinese environmental isolates (P = 0.388). The Japanese and Chinese isolates were assigned to 203 and 36 different sequence-types (ST), respectively. ST1 was predominant. Most isolates with the same ST also had the same lag-1, ORF 7, and ORF 8 gene subgroups. In conclusion, the lag-1 was present in most of the clinical isolates, but was absent from most of the environmental isolates from both China and Japan, regardless of the water source and SBT type. PCR-based serotyping and subgrouping methods can be used to define a hierarchy of virulence genotypes that require stringent surveillance to prevent human disease.
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PMID:Distribution of lag-1 Alleles, ORF7, and ORF8 Genes of Lipopolysaccharide and Sequence-Based Types Among Legionella pneumophila Serogroup 1 Isolates in Japan and China. 3144 41