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 Slide culture of a Streptomyces sp.
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S. ambofaciens |
Streptomyces, the largest genus of Actinobacteria and type genus of the family Streptomycetaceae.[1] The current tally of the numbers of species is more than 500.[2] Streptomyces, along with other Actinobacteria, is a group containing Gram-positive cell wall and genomes with high GC-content bacteria.[3] Streptomycetes are found predominantly in soil and in decaying vegetation, and most produce spores. Streptomycetes are noted for their distinct "earthy" odor which results from production of a volatile metabolite, geosmin.
Streptomycetes are characterised by a complex secondary metabolism.[3] They produce over two thirds of the clinically useful antibiotics of natural origin (e.g., neomycin, chloramphenicol)[4]. The now rarely-used streptomycin takes its name directly from Streptomyces. Streptomycetes are infrequent pathogens, though infections in human such as mycetoma can be caused by S. somaliensis and S. sudanensis and in plants such as scabies can be caused by S. caviscabies and S. scabies.
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Genomics
The complete genome of one of the strain, "S. coelicolor" A3(2), was published in 2002.[5] At the time, the "S. coelicolor" genome was thought to contain the largest number of genes of any bacteriumcitation needed. The first complete genome sequence of S. avermitilis was completed in 2003.[6] Each of these genomes form a chromosome with a linear structure, unlike most bacterial genomes which exist in the form of circular chromosomes. The genome sequence of S. scabies, a member of the genus with the ability to cause potato scab disease, has been determined at the Wellcome Trust Sanger Institute and is currently in annotation, with publication scheduled for 2007.
Taxonomically, "S. coelicolor" A3(2) belongs to the species of S. violaceoruber and not a validly described separate species; "S. coelicolor" A3(2) is not to be mistaken for S. coelicolor (Müller) (ATCC 23899).
Biotechnology
In recent years, biotechnology researchers have begun to use Streptomyces spp. for production of recombinant human proteins. Traditionally, Escherichia coli was the species of choice to host eukaryotic genes since it was well understood and easy to work with.[7][8] However, E. coli introduces problems such as incorrect (or lack of) glycosylation and incorrect protein folding, resulting in insolubility and loss of bioactivity of the product.[9] Streptomyces spp. on the other hand have the ability to secrete correctly folded recombinant proteins into the medium after production simplifying the subsequent purification steps. These properties among others make Streptomyces spp. an attractive alternative to other bacteria such as E. coli and Bacillus subtiliscitation needed.
Medicine
Streptomyces is the largest antibiotic producing genus[10], producing both antibacterials and antifungals, and also a wide range of other bioactive compounds such as immunosuppressants
Some of the antifungals produced by Streptomyces spp.
- See also: polyene antimycotic
- Nystatin (from S. noursei)
- Amphotericin B (from S. nodosus)
- Natamycin (from S. natalensis)
Some of the antibiotics produced by Streptomyces spp.
- Erythromycin (from S. erythreus)
- Neomycin (from S. fradiae)
- Streptomycin (from S. griseus)
- Tetracycline (from S. rimosus)
- Vancomycin (from S. orientalis)
- Rifamycin (from S. mediterranei)
- Chloramphenicol (from S. venezuelae)
- Puromycin (from S. alboniger)
- Lincomycin (from S. lincolnensis)
Some of the Alkaloids produced by Streptomyces spp.
- Physostigmine (from S.griseofuscus)
Some of the anti-cancer compounds produced by Streptomyces spp.
- Migrastatin (from S. platensis)
References
- ^ The Family Streptomycetaceae, Part I: Taxonomy - The Prokaryotes
- ^ List of Prokaryotic names
- ^ a b Madigan M; Martinko J (editors). (2005). Brock Biology of Microorganisms, 11th ed., Prentice Hall. ISBN 0-13-144329-1.
- ^ Kieser, T., Bibb, M. J., Buttner, M. J., Chater, K. F., and Hopwood, D. A. (2000). Practical Streptomyces Genetics, 2nd edn., Norwich, UK: John Innes Foundation.
- ^ Bentley SD, et al. (2002). "Complete genome sequence of the model actinomycete "Streptomyces coelicolor" A3(2)". Nature 417: 141–147. doi:. PMID 12000953.
- ^ Ikeda H; Ishikawa J; Hanamoto A; Shinose M; Kikuchi H; Shiba T; Sakaki Y; Hattori M; Omura S (2003). "Complete genome sequence and comparative analysis of the industrial microorganism Streptomyces avermitilis". Nat. Biotechnol. 21: 526–531. doi:. PMID 12692562.
- ^ Brawner M, Poste G, Rosenberg M, Westpheling J (1991). "Streptomyces: a host for heterologous gene expression". Curr Opin Biotechnol 2 (5): 674–81. doi:. PMID 1367716.
- ^ Payne G, DelaCruz N, Coppella S (1990). "Improved production of heterologous protein from Streptomyces lividans". Appl Microbiol Biotechnol 33 (4): 395–400. doi:. PMID 1369282.
- ^ Binnie C, Cossar J, Stewart D (1997). "Heterologous biopharmaceutical protein expression in Streptomyces". Trends Biotechnol 15 (8): 315–20. doi:. PMID 9263479.
- ^ Watve MG, Tickoo R, Jog MM, Bhole BD (November 2001). "How many antibiotics are produced by the genus Streptomyces?". Arch. Microbiol. 176 (5): 386–90. doi:. PMID 11702082.
Further reading
- Baumberg S (1991). Genetics and Product Formation in Streptomyces. Kluwer Academic. ISBN 978-0306438851.
- Gunsalus IC (1986). Bacteria: Antibiotic-producing Streptomyces. Academic Press. ISBN 978-0123072092.
- Hopwood DA (2007). Streptomyces in Nature and Medicine: The Antibiotic Makers. Oxford University Press. ISBN 978-0195150667.
See also
- Antimycin A - compound produced by this bacteria used in piscicides.
External links
- Some current Streptomyces Research & Methods / Protocols / Resources
- S. avermitilis genome homepage (Kitasato Institute for Life Sciences)
- S. avermitilis is the avermectin producer.
- S. coelicolor A3(2) genome homepage (Sanger Institute)
- Streptomyces.org.uk homepage (John Innes Centre)
- StrepDB - the Streptomyces genomes annotation browser
- Streptomyces Genome Projects from Genomes OnLine Database
Wikipedia content modification information:
- This page was last modified on 5 July 2008, at 11:09.
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