Listeria welshimeri serovar 6b str. SLCC5334

Names Listeria welshimeri serovar 6b str. SLCC5334
Accession numbers NC_008555
Background Listeria are Gram-positive, motile, facultative anaerobic bacteria; L.welshimeri (serovar 6b) is one of 4 nonpathogenic members of the genus. There are 2 pathogenic members, L.monocytogenes (also fully sequenced) and L.ivanovii. L.welshimeri was first isolated from decaying plants. Biochemical properties such as presence of catalase activity, absence of oxidase activity and acid production from fermentation of D-xylose or alpha-methyl-D-mannoside but not from L-rhamnose or D-mannitol are used to distinguish it from other Listeria. Comparisons between the 4 currently fully-sequenced genomes L.welshimeri, L.innocua (another non-pathogenic Listeria) and L.monocytogenes indicate that the non-pathogenic Listeria probably evolved from a virulent ancestor by loss of the virulence gene cluster region. Genes lost include those coding for virulence, general intracellular survival genes, surface-associated LPXTG- and LRR-containing proteins and proteins involved in survival at elevated temperatures. L.welshimeri has undergone further gene loss (233 genes compared to L.innocua and L.monocytogenes) and acquired other novel genes (311 genes compared to L.innocua and L.monocytogenes), probably as a result of horizontal gene transfer. Genes exclusively present in L.welshimeri include those for uptake and utilization systems for plant energy sources, indicating an adaptation to a plant saprophytic lifestyle. It contains a single putative prophage inserted in a region that in the related pathogen L.ivanovii has pathogenicity island. (EBI Integr8)
Strain SLCC5334
Complete Yes
Sequencing centre (10-MAY-2006) Hain T., Institute for Medical Microbiology, Justus-Liebig-University, Frankfurter Strasse 107,
(30-OCT-2006) National Center for Biotechnology Information, NIH, Bethesda, MD 20894, USA
Sequencing quality Level 6: Finished
Sequencing depth NA
Sequencing method NA
Isolation site decaying plant material
Isolation country USA
Number of replicons 1
Gram staining properties Positive
Shape Bacilli
Mobility No
Flagellar presence Yes
Number of membranes 1
Oxygen requirements Facultative
Optimal temperature NA
Temperature range Mesophilic
Habitat Multiple
Biotic relationship Free living
Host name NA
Cell arrangement Chains, Singles
Sporulation Nonsporulating
Metabolism NA
Energy source Chemoorganotroph
Diseases NA
Pathogenicity No