Streptomyces
Streptomyces | |
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Slide culture of a Streptomyces species | |
Scientific classification ![]() | |
Domain: | Bacteria |
Phylum: | Actinomycetota |
Class: | Actinomycetia |
Order: | Streptomycetales |
Family: | Streptomycetaceae |
Genus: | Streptomyces Waksman and Henrici 1943 (Approved Lists 1980) |
Diversity | |
About 550 species | |
Synonyms[1] | |
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![](https://upload.wikimedia.org/wikipedia/commons/thumb/f/f7/Streptomyces_mycelial_sheets.webp/254px-Streptomyces_mycelial_sheets.webp.png)
Streptomyces is the largest genus of Actinomycetota and the type genus of the family Streptomycetaceae.[3] Over 500 species of Streptomyces bacteria have been described.[4] As with the other Actinomycetota, streptomycetes are gram-positive, and have genomes with high GC content.[5] Found predominantly in soil and decaying vegetation, most streptomycetes produce spores, and are noted for their distinct "earthy" odor that results from production of a volatile metabolite, geosmin.
Streptomycetes are characterised by a complex secondary metabolism.[5] They produce over two-thirds of the clinically useful antibiotics of natural origin (e.g., neomycin, cypemycin, grisemycin, bottromycins and chloramphenicol).[6][7] The antibiotic streptomycin takes its name directly from Streptomyces. Streptomycetes are infrequent pathogens, though infections in humans, such as mycetoma, can be caused by S. somaliensis and S. sudanensis, and in plants can be caused by S. caviscabies, S. acidiscabies, S. turgidiscabies and S. scabies.
Taxonomy
Streptomyces is the type genus of the family Streptomycetaceae[8] and currently covers close to 576 species with the number increasing every year.[9] Acidophilic and acid-tolerant strains that were initially classified under this genus have later been moved to Kitasatospora (1997) [10] and Streptacidiphilus (2003).[11] Species nomenclature are usually based on their color of hyphae and spores.
Saccharopolyspora erythraea was formerly placed in this genus (as Streptomyces erythraeus).
Morphology
The genus Streptomyces includes aerobic, Gram-positive, filamentous bacteria that produce well-developed vegetative hyphae (between 0.5-2.0 µm in diameter) with branches. They form a complex substrate mycelium that aids in scavenging organic compounds from their substrates.[12] Although the mycelia and the aerial hyphae that arise from them are amotile, mobility is achieved by dispersion of spores.[12] Spore surfaces may be hairy, rugose, smooth, spiny or warty.[13] In some species, aerial hyphae consist of long, straight filaments, which bear 50 or more spores at more or less regular intervals, arranged in whorls (verticils). Each branch of a verticil produces, at its apex, an umbel, which carries from two to several chains of spherical to ellipsoidal, smooth or rugose spores.[12] Some strains form short chains of spores on substrate hyphae. Sclerotia-, pycnidia-, sporangia-, and synnemata-like structures are produced by some strains.
Genomics
The complete genome of "S. coelicolor strain A3(2)" was published in 2002.[14] At the time, the "S. coelicolor" genome was thought to contain the largest number of genes of any bacterium.[14] The chromosome is 8,667,507 bp long with a GC-content of 72.1%, and is predicted to contain 7,825 protein-encoding genes.[14] In terms of taxonomy, "S. coelicolor A3(2)" belongs to the species S. violaceoruber, and is not a validly described separate species; "S. coelicolor A3(2)" is not to be mistaken for the actual S. coelicolor (Müller), although it is often referred to as S. coelicolor for convenience.[15] The transcriptome and translatome analyses of the strain A3(2) were published in 2016.[16]
The first complete genome sequence of S. avermitilis was completed in 2003.[17] Each of these genomes forms a chromosome with a linear structure, unlike most bacterial genomes, which exist in the form of circular chromosomes.[18] 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. At 10.1 Mbp long and encoding 9,107 provisional genes, it is the largest known Streptomyces genome sequenced, probably due to the large pathogenicity island.[18][19]
Biotechnology
In recent years, biotechnology researchers have begun using Streptomyces species for heterologous expression of proteins. Traditionally, Escherichia coli was the species of choice to express eukaryotic genes, since it was well understood and easy to work with.[20][21] Expression of eukaryotic proteins in E. coli may be problematic. Sometimes, proteins do not fold properly, which may lead to insolubility, deposition in inclusion bodies, and loss of bioactivity of the product.[22] Though E. coli strains have secretion mechanisms, these are of low efficiency and result in secretion into the periplasmic space, whereas secretion by a Gram-positive bacterium such as a Streptomyces species results in secretion directly into the extracellular medium. In addition, Streptomyces species have more efficient secretion mechanisms than E.coli. The properties of the secretion system is an advantage for industrial production of heterologously expressed protein because it simplifies subsequent purification steps and may increase yield. These properties among others make Streptomyces spp. an attractive alternative to other bacteria such as E. coli and Bacillus subtilis.[22]
Plant pathogenic bacteria
So far, ten species belonging to this genus have been found to be pathogenic to plants:[9]
- S. scabiei
- S. acidiscabies
- S. europaeiscabiei
- S. luridiscabiei
- S. niveiscabiei
- S. puniciscabiei
- S. reticuliscabiei
- S. stelliscabiei
- S. turgidiscabies (scab disease in potatoes)
- S. ipomoeae (soft rot disease in sweet potatoes)
Medicine
Streptomyces is the largest antibiotic-producing genus, producing antibacterial, antifungal, and antiparasitic drugs, and also a wide range of other bioactive compounds, such as immunosuppressants.[23] Almost all of the bioactive compounds produced by Streptomyces are initiated during the time coinciding with the aerial hyphal formation from the substrate mycelium.[12]
Antifungals
Streptomycetes produce numerous antifungal compounds of medicinal importance, including nystatin (from S. noursei), amphotericin B (from S. nodosus),[24] and natamycin (from S. natalensis).
Antibacterials
Members of the genus Streptomyces are the source for numerous antibacterial pharmaceutical agents; among the most important of these are:
- Chloramphenicol (from S. venezuelae)[25]
- Daptomycin (from S. roseosporus)[26]
- Fosfomycin (from S. fradiae)[27]
- Lincomycin (from S. lincolnensis)[28]
- Neomycin (from S. fradiae)[29]
- Nourseothricin[citation needed]
- Puromycin (from S. alboniger)[30]
- Streptomycin (from S. griseus)[31]
- Tetracycline (from S. rimosus and S. aureofaciens)[32]
- Oleandomycin (from S. antibioticus)[33][34][35]
- Tunicamycin (from S. torulosus)[36]
- Mycangimycin (from Streptomyces sp. SPB74 and S. antibioticus)[37]
- Boromycin (from S. antibioticus)[38]
- Bambermycin (from S. bambergiensis and S. ghanaensis, the active compound being moenomycins A and C)[39]
- Vulgamycin[40]
Clavulanic acid (from S. clavuligerus) is a drug used in combination with some antibiotics (like amoxicillin) to block and/or weaken some bacterial-resistance mechanisms by irreversible beta-lactamase inhibition. Novel antiinfectives currently being developed include Guadinomine (from Streptomyces sp. K01-0509),[41] a compound that blocks the Type III secretion system of Gram-negative bacteria.
Antiparasitic drugs
S. avermitilis is responsible for the production of one of the most widely employed drugs against nematode and arthropod infestations, avermectin,[42] and thus its derivatives including ivermectin.
Other
Less commonly, streptomycetes produce compounds used in other medical treatments: migrastatin (from S. platensis) and bleomycin (from S. verticillus) are antineoplastic (anticancer) drugs; boromycin (from S. antibioticus) exhibits antiviral activity against the HIV-1 strain of HIV, as well as antibacterial activity. Staurosporine (from S. staurosporeus) also has a range of activities from antifungal to antineoplastic (via the inhibition of protein kinases).
S. hygroscopicus and S. viridochromogenes produce the natural herbicide bialaphos.
Saptomycins are chemical compounds isolated from Streptomyces.[43]
Symbiosis
Sirex wasps cannot perform all of their own cellulolytic functions and so some Streptomyces do so in symbiosis with the wasps.[44] Book et al. have investigated several of these symbioses.[44] Book et al., 2014 and Book et al., 2016 identify several lytic isolates.[44] The 2016 study isolates Streptomyces sp. Amel2xE9 and Streptomyces sp. LamerLS-31b and finds that they are equal in activity to the previously identified Streptomyces sp. SirexAA-E.[44]
See also
- Antimycin A – Chemical compound produced by Stroptomyces used as a piscicide
- Geosmin – Chemical compound responsible for the characteristic odour of earth
- Streptomyces isolates
References
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- ^ Kim SB, Lonsdale J, Seong CN, Goodfellow M (2003). "Streptacidiphilus gen. nov., acidophilic actinomycetes with wall chemotype I and emendation of the family Streptomycetaceae (Waksman and Henrici (1943)AL) emend. Rainey et al. 1997". Antonie van Leeuwenhoek. 83 (2): 107–16. doi:10.1023/A:1023397724023. PMID 12785304. S2CID 12901116.
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- ^ Holmes TC, May AE, Zaleta-Rivera K, Ruby JG, Skewes-Cox P, Fischbach MA, et al. (October 2012). "Molecular insights into the biosynthesis of guadinomine: a type III secretion system inhibitor". Journal of the American Chemical Society. 134 (42): 17797–806. doi:10.1021/ja308622d. PMC 3483642. PMID 23030602.
- ^ Martín, Juan F; Rodríguez-García, Antonio; Liras, Paloma (2017-03-15). "The master regulator PhoP coordinates phosphate and nitrogen metabolism, respiration, cell differentiation and antibiotic biosynthesis: comparison in Streptomyces coelicolor and Streptomyces avermitilis". The Journal of Antibiotics. Japan Antibiotics Research Association (Nature Portfolio). 70 (5): 534–541. doi:10.1038/ja.2017.19. ISSN 0021-8820. PMID 28293039. S2CID 1881648.
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- ^ a b c d Li, Hongjie; Young, Soleil E.; Poulsen, Michael; Currie, Cameron R. (2021-01-07). "Symbiont-Mediated Digestion of Plant Biomass in Fungus-Farming Insects". Annual Review of Entomology. Annual Reviews. 66 (1): 297–316. doi:10.1146/annurev-ento-040920-061140. ISSN 0066-4170. OSTI 1764729. PMID 32926791. S2CID 221724225.
Further reading
- Baumberg S (1991). Genetics and Product Formation in Streptomyces. Kluwer Academic. ISBN 978-0-306-43885-1.
- Gunsalus IC (1986). Bacteria: Antibiotic-producing Streptomyces. Academic Press. ISBN 978-0-12-307209-2.
- Hopwood DA (2007). Streptomyces in Nature and Medicine: The Antibiotic Makers. Oxford University Press. ISBN 978-0-19-515066-7.
- Dyson P, ed. (2011). Streptomyces: Molecular Biology and Biotechnology. Caister Academic Press. ISBN 978-1-904455-77-6.
External links
- "Current research on Streptomyces coelicolor". Norwich Research Park. 3 January 2018.
- "Some current Streptomyces Research & Methods / Protocols / Resources". www.openwetware.org.
- "S. avermitilis genome homepage". Kitasato Institute for Life Sciences.
- "S. coelicolor A3(2) genome homepage". Sanger Institute.
- "Streptomyces.org.uk homepage". John Innes Centre.
- "StrepDB - the Streptomyces genomes annotation browser".
- "Streptomyces Genome Projects". Genomes OnLine Database.Error: "Q1144013" is not a valid Wikidata entity ID.
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