Sphingomonas

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Sphingomonas
Scientific classification
Kingdom: Bacteria
Phylum: Proteobacteria
Class: Alphaproteobacteria
Order: Sphingomonadales
Family: Sphingomonadaceae
Genus: Sphingomonas
Species

Sphingomonas abaci
Sphingomonas adhaesiva
Sphingomonas aerolata
Sphingomonas aestuarii
Sphingomonas alaskensis
Sphingomonas alpina
Sphingomonas aquatilis
Sphingomonas aromaticivorans
Sphingomonas asaccharolytica
Sphingomonas astaxanthinifaciens
Sphingomonas aurantiaca
Sphingomonas azotifigens
Sphingomonas baekryungensis
Sphingomonas capsulata
Sphingomonas changbaiensis
Sphingomonas chlorophenolica
Sphingomonas chungbukensis
Sphingomonas cloacae
Sphingomonas cynarae
Sphingomonas desiccabilis
Sphingomonas dokdonensis
Sphingomonas echinoides
Sphingomonas elodea
Sphingomonas endophytica
Sphingomonas faeni
Sphingomonas fennica
Sphingomonas formosensis
Sphingomonas ginsengisoli
Sphingomonas ginsenosidimutans
Sphingomonas glacialis
Sphingomonas haloaromaticamans
Sphingomonas hankookensis
Sphingomonas herbicidovorans
Sphingomonas histidinilytica
Sphingomonas indica
Sphingomonas insulae
Sphingomonas japonica
Sphingomonas jaspsi
Sphingomonas jejuensis
Sphingomonas jinjuensis
Sphingomonas kaistensis
Sphingomonas koreensis
Sphingomonas laterariae
Sphingomonas leidyi
Sphingomonas macrogoltabidus
Sphingomonas mali
Sphingomonas melonis
Sphingomonas molluscorum
Sphingomonas mucosissima
Sphingomonas natatoria
Sphingomonas oligophenolica
Sphingomonas oryziterrae
Sphingomonas panni
Sphingomonas parapaucimobilis
Sphingomonas paucimobilis
Sphingomonas phyllosphaerae
Sphingomonas pituitosa
Sphingomonas polyaromaticivorans
Sphingomonas pruni
Sphingomonas rosa
Sphingomonas roseiflava
Sphingomonas rubra
Sphingomonas sanguinis
Sphingomonas sanxanigenens
Sphingomonas sediminicola
Sphingomonas soli
Sphingomonas starnbergensis
Sphingomonas stygia
Sphingomonas subarctica
Sphingomonas suberifaciens
Sphingomonas subterranea
Sphingomonas taejonensis
Sphingomonas terrae
Sphingomonas trueperi
Sphingomonas ursincola
Sphingomonas wittichii
Sphingomonas xenophaga
Sphingomonas yabuuchiae
Sphingomonas yanoikuyae
Sphingomonas yunnanensis

Sphingomonas was defined in 1990 as a group of Gram-negative, rod-shaped, chemoheterotrophic, strictly aerobic bacteria. They possess ubiquinone 10 as their major respiratory quinone, contain glycosphingolipids (GSLs) instead of lipopolysaccharide (LPS) in their cell envelopes, and typically produce yellow-pigmented colonies.[1]

By 2001, the genus included more than 20 species that were quite diverse in terms of their phylogenetic, ecological, and physiological properties. As a result, the Sphingomonas were subdivided into four genera: Sphingomonas, Sphingobium, Novosphingobium, Sphingosinicella, and Sphingopyxis. These genera are commonly referred to collectively as sphingomonads. The sphingomonads are widely distributed in nature, having been isolated from many different land and water habitats, as well as from plant root systems, clinical specimens, and other sources; this is due to their ability to survive in low concentrations of nutrients, as well as to metabolize a wide variety of carbon sources. Numerous strains have been isolated from environments contaminated with toxic compounds, where they display the ability to utilize the contaminants as nutrients.[1]

Some of the sphingomonads (especially Sphingomonas paucimobilis) also play a role in human disease, primarily by causing a range of mostly nosocomial, non-life-threatening infections that typically are easily treated by antibiotic therapy.[2][3]

Due to their biodegradative and biosynthetic capabilities, sphingomonads have been utilised for a wide range of biotechnological applications, from bioremediation of environmental contaminants to production of extracellular polymers such as sphingans (e.g., gellan, welan, and rhamsan) used extensively in the food and other industries[citation needed]. The shorter carbohydrate moiety of GSL compared to that of LPS results in the cell surface being more hydrophobic than that of other Gram-negative bacteria, probably accounting for both Sphingomonas' sensitivity to hydrophobic antibiotics and its ability to degrade hydrophobic polycyclic aromatic hydrocarbons.[1] One strain, Sphingomonas sp. 2MPII, can degrade 2-methylphenanthrene.[4] In May 2008, Daniel Burd, a 16-year-old Canadian, won the Canada-Wide Science Fair in Ottawa after discovering that Sphingomonas can degrade over 40% of the weight of plastic bags (Polyethylene) in less than three months.[5]

A Sphingomonas sp. strain BSAR-1 expressing a high activity alkaline phosphatase (PhoK) has also been applied for bioprecipitation of uranium from alkaline solutions. The precipitation ability was enhanced by overexpressing PhoK protein in E. coli. This is the first report of bioprecipitation of uranium under alkaline conditions.[6]

References[edit]

  1. ^ a b c Sphingomonas, Microbewiki
  2. ^ Sphingomonas paucimobilis: a persistent Gram-negative nosocomial infectious organism., Ryan MP, Adley CC., J Hosp Infect. 2010 Jul;75(3):153-7. doi: 10.1016/j.jhin.2010.03.007.
  3. ^ Sphingomonas paucimobilis Bloodstream Infections Associated with Contaminated Intravenous Fentanyl, Lisa L. Maragakis, Romanee Chaiwarith, Arjun Srinivasan, Francesca J. Torriani, Edina Avdic, Andrew Lee, Tracy R. Ross, Karen C. Carroll, and Trish M. Perl, Emerging Infectious Diseases Vol. 15, No. 1, January 2009
  4. ^ G.M. Ni'matuzahroh, M. Gilewicz, M. Guiliano & J.C. Bertrand (May 1999). "In-vitro study of interaction between photooxidation and biodegradation of 2-methylphenanthrene by Sphingomonas sp 2MPII". Chemosphere 38 (11): 2501–2507. doi:10.1016/S0045-6535(98)00456-1. ISSN 0045-6535. PMID 10204235. 
  5. ^ TheRecord.com—CanadaWorld—WCI student isolates microbe that lunches on plastic bags
  6. ^ K.S. Nilgiriwala, A. Alahari, A. S. Rao & S.K. Apte (Sept 2008). "Cloning and Overexpression of Alkaline Phosphatase PhoK from Sphingomonas sp. Strain BSAR-1 for Bioprecipitation of Uranium from Alkaline Solutions". Applied and Environmental Microbiology 74 (17): 5516–5523. doi:10.1128/AEM.00107-08. ISSN 1098-5336. PMC 2546639. PMID 18641147. 

External links[edit]