Legionella cherrii
| Legionella cherrii | |
|---|---|
| Scientific classification | |
| Kingdom: | Bacteria |
| Phylum: | Proteobacteria |
| Class: | γ-proteobacteria |
| Order: | Legionellales |
| Family: | Legionellaceae |
| Genus: | Legionella |
| Species: | L. cherrii |
| Binomial name | |
|
Legionella cherrii |
|
| Type strain | |
| ATCC 35252, BCRC 17044, CCRC 17044, CCUG 29666, CIP 103842, DSM 19213, NCTC 11976, ORW | |
Legionella cherrii is an aerobic, flagellated, Gram-negative bacterium from the genus Legionella. It was isolated from a heated water sample in Minnesota.L. cherrii is similar to another Legionella species, L. pneumophila, and is believed to cause major respiratory problems.
The bacterium was first discovered in 1982 by R. L. Tyndall and C. B. Duncan, who were a part of D.J. Brenner's team that discovered ten new species of Legionella. The isolation process initiated after collecting water samples and transferring them into guinea pig tissues before plating them onto buffered charcoal yeast extract agar. Afterwords, L. cherrii strains were cultured around 36 °C in an environment containing 2.5% carbon dioxide.
The genus Legionella is named after the 1976 pneumonia (Legionella pneumophila) outbreak at the American Legion convention at the Bellevue-Stratford Hotel in Philadelphia. The genus was previously unknown, but it was established three years later. The specific term cherrii is derived from the scientist William B. Cherry due to his contributions on the studies of Legionellae.
L. cherrii is rod-shaped and considered an oxidase-negative bacterium since it lacks c oxidase and does not use oxygen in its electron transport chain.L. cherrii also has the ability to autofluoresce a bluish-white color which was tested by placing the specimen under a Woods lamp-a mechanism that uses backlight to highlight bacteria-and measured under 366 nm wavelengths.L. cherrii lacks the ability to reduce nitrate, does not contain a urease, and does not convert D-glucose to acid. However, L. cherrii can hydrolyze gelatin. When on a yeast extract agar plate, L. cherrii forms a dissolvable brown pigment containing tyrosine. One or a few flagella aid them in their motility.Legionella organisms’ dependence on L-cysteine and their unique fatty acids and isoprenoid ubiquinone distinguish them from other aerobic bacteria. Like other Legionella species, L. cherrii does not form spores and is an aerobic, Gram-negative bacterium. The genome size was sequenced using Illumina HiSeq 2000 and found to be 3.7 Mb. Scaffold assembly was conducted using whole genome shotgun sequencing and 13 scaffolds were found in the complete genome. The G/C content for this particular species of Legionella is 38.8 mol%. About 3,111 protein coding genes, four rRNA genes, and 36 tRNA genes were also discovered in the genome.
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