| Shewanella putrefaciens | |
|---|---|
Scientific classification | |
| Domain: | Bacteria |
| Kingdom: | Pseudomonadati |
| Phylum: | Pseudomonadota |
| Class: | Gammaproteobacteria |
| Order: | Alteromonadales |
| Family: | Shewanellaceae |
| Genus: | Shewanella |
| Species: | S. putrefaciens |
| Binomial name | |
| Shewanella putrefaciens (Leeet al. 1981) MacDonell and Colwell 1986 | |
| Synonyms | |
Pseudomonas putrefaciens(Derby and Hammer 1931) Long and Hammer 1941 | |
Shewanella putrefaciens is aGram-negative pleomorphicbacterium. It has been isolated frommarine environments, as well as from anaerobic sandstone in theMorrison Formation inNew Mexico.[1]S. putrefaciens is also afacultative anaerobe with the ability toreduceiron andmanganesemetabolically; that is, it can use iron and manganese as the terminalelectron acceptor in theelectron transport chain (in contrast toobligate aerobes which must use oxygen for this purpose). It is also one of the organisms associated with the odor of rotting fish, as it is a marine organism which producestrimethylamine (hence the species name putrefaciens, fromputrid).
In both solid and liquid media,S. putrefaciens is often recognizable by its bright pink color. On solid media, the colonies are round, fast-growing, and pink. The organism is also fast-growing in liquid media, and there will give the liquid an overall pink hue. On blood agar plates, the colonies are typically convex and large, with a brown pigment, and cause “greening” of the agar around the colonies.S. putrefaciens are non-lactose fermenters on MacConkey agar. As with allShewanella, this organism produceshydrogen sulfide onTSI.[2]
Although it is very rare for it to act as a human pathogen, there have been cases of infections and bacteremia caused byS. putrefaciens.[3][4][5]
Shewanella putrefaciens is one of several species that have been shown to derive energy by reducingU(VI) to U(IV), which is thought to be important in making uranium deposits.[6] In fact, strain CN32 is very metabolically versatile and is capable of reducing metals, metalloids, and even radionuclides in place of oxygen during anaerobic growth. This is known to include (but is not necessarily limited to) Fe(III)→Fe(II), Mn(IV)→(via Mn(III) intermediate)→Mn(II),V(V)→V(IV),Tc(VII)→Tc(V/IV) and U(VI)→U(IV).[citation needed]
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