Shewanella
RANK: Genus
TAXONOMY: cellular organisms -> Bacteria -> Proteobacteria -> Gammaproteobacteria -> Alteromonadales -> Shewanellaceae -> Shewanella
OVERVIEW:
Straight or curved rods, 0.5–0.8 × 0.7–2.0 µm. Endospores and microcysts are not formed. Motile by a single, unsheathed, polar flagellum. Gram negative. Colonies are often pale tan to pink-orange, due to cytochrome accumulation. Oxidase and catalase positive. Chemoheterotrophic. Facultatively anaerobic. Oxygen is used as the electron acceptor during aerobic growth. Anaerobic growth is predominantly respiratory; the oxidation of organic carbon compounds or H2 is coupled to the reduction of various inorganic and organic electron acceptors, including NO3−, NO2−, Fe3+, trimethylamine-N-oxide, fumarate, various sulfur compounds, and Mn4+. May also be fermentative, producing acid (but usually no gas) from carbohydrates, such as d-glucose and N-acetylglucosamine. Constitutive arginine dihydrolase is usually absent. Most strains can form H2S from thiosulfate. May require Na+ ions for growth. Most species can grow at 4°C. Some species are psychrophilic. One species is psychrophilic and barophilic. Major fatty acids are C13:0 iso, C14:0, C15:0, C15:0 iso, C16:1 ω7c, C16:0, and C17:1 ω8c. Several species can also form significant quantities of the omega-3 fatty acid eicosapentaenoic acid (C20:5 ω3c). Isoprenoid quinone components include ubiquinone-8, ubiquinone-7, and menaquinone-7, with smaller amounts of methylmenaquinone-7. Major polyamines are putrescine and cadaverine. Member of the order Alteromonadales, family Alteromonadaceae, class Gammaproteobacteria. Isolated from clinical samples, chilled meats, butter, cutting oils, fresh water, freshwater sediment, estuaries, salt marshes, marine algae, seawater, marine sediment, fish, marine invertebrates, sea ice, marine snow, and abyssal ocean waters. The mol% G + C of the DNA is: 38–54.Type species: Shewanella putrefaciens
Microbial Abundance Data: Shewanella
Percent of total population with standard deviation [PMID: 22698087]. Percentages > 1% highlighted. |
Buccal
Mucosa | Keratinized
Gingiva | Hard
Palate |
Throat | Tonsils | Saliva | Stool |
0.000 %
(0.002) |
0.000 %
(0.000) |
0.000 %
(0.001) |
0.000 %
(0.000) |
0.000 %
(0.000) |
0.000 %
(0.000) |
0.000 %
(0.000) |
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