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Description of Schizochytrium
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Schizochytrium is a genus of unicellular protists, one of several that make up the thraustochytrids. . These organisms were once thought of as a kind of fungus, but are now assigned to the stramenopiles, a group that also contains kelp and an array of micro-algae. Several different forms occur in the life cycle. The feeding form typically has a stiff rounded body producing cellular extensions with which they feed and occasionally transforming into a mobile flagellated organism (flagella have stiff tripartite hairs typical of stramenopiles). They may encyst. Excysting cells grow and divide to form a cluster of cells each of which may become a sorus that produce biflagellate flagellates stages (zoospores). Not very speciose Schizochytrium was described by Goldstein & Belsky in 1964 from coastal marine habitats. Members of the genus produce significant amounts of docosahexaenoic acid, are now grown commercially as a source of this oil for biofeeds, biomass and as the basis of biofuels.
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Schizochytrium
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Schizochytrium is a genus of unicellular eukaryotes in the family Thraustochytriaceae, which are found in coastal marine habitats. They are assigned to the Stramenopiles (heterokonts), a group which also contains kelp and various microalgae.

Lifecycle

Several stages occur in its lifecycle. The feeding form has a stiff, rounded body with cellular extensions used in feeding. Cells can transform into mobile flagellated cells with stiff tripartite hairs typical of the Stramenopiles. Cells can also grow and divide to form a cluster of cells which may become a sorus that produces biflagellated zoospores.

Relation to humans

Certain species produce large amounts of docosahexaenoic acid (DHA)[4] and are grown commercially for production of this oil for animal feeds, biomass, biofuels and direct human consumption in supplements and additives.[5]

In 2016, juvenile Nile tilapia were given a feed containing dried Schizochytrium in place of fish oil. When compared to a control group raised on regular feed, they exhibited higher weight gain and better feed conversion, and their flesh was higher in omega-3 fatty acids.[6][7]

DHA synthesis in Schizochytrium

DHA synthesis in Schizochytrium does not involve membrane-bound desaturases or fatty acid elongation enzymes such as those described for other eukaryotes.[8][9] Instead it is thought that DHA synthesis in Schizochytrium occurs via a Polyketide synthase (PKS)-based pathway, although the primary structures of the Polyketide synthases do not conform to any known class of PKS proteins.[8][10] Homology between Shewanella and Schizochytrium PKS genes suggests that the genes involved in this pathway underwent lateral gene transfer.[8]

References

  1. ^ Rinka Yokoyama & Daiske Honda (2007). "Taxonomic rearrangement of the genus Schizochytrium sensu lato based on morphology, chemotaxonomic characteristics, and 18S rRNA gene phylogeny (Thraustochytriaceae, Labyrinthulomycetes): emendation for Schizochytrium and erection of Aurantiochytrium and Oblongichytrium gen. nov". Mycoscience. 48 (4): 199–211. doi:10.1007/s10267-006-0362-0..mw-parser-output cite.citation{font-style:inherit}.mw-parser-output q{quotes:"""""'"'"}.mw-parser-output code.cs1-code{color:inherit;background:inherit;border:inherit;padding:inherit}.mw-parser-output .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Lock-green.svg/9px-Lock-green.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-limited a,.mw-parser-output .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2.svg/9px-Lock-gray-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2.svg/9px-Lock-red-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration{color:#555}.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration span{border-bottom:1px dotted;cursor:help}.mw-parser-output .cs1-hidden-error{display:none;font-size:100%}.mw-parser-output .cs1-visible-error{font-size:100%}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-right{padding-right:0.2em}
  2. ^ a b UniProt
  3. ^ Honda, Daiske; Yokochi, Toshihiro; Nakahara, Toro; Erata, Mayumi; Higashihara, Takanori (April 1998). "Schizochytrium limacinum sp. nov., a new thraustochytrid from a mangrove area in the west Pacific Ocean". Mycological Research. 102 (4): 439–448. doi:10.1017/S0953756297005170.
  4. ^ Yue Jiang, King-Wai Fan, Raymond Tsz-Yeung Wong & Feng Chen (2004). "Fatty acid composition and squalene content of the marine microalga Schizochytrium mangrovei". Journal of Agricultural and Food Chemistry. 52 (5): 1196–1200. doi:10.1021/jf035004c. PMID 14995120.CS1 maint: Multiple names: authors list (link)
  5. ^ Whoriskey, Peter (5 June 2017). "How millions of cartons of 'organic' milk contain an oil brewed in industrial vats of algae". The Washington Post. Retrieved 9 June 2017.
  6. ^ Coxworth, Ben (June 6, 2016). "Scientists take the fish out of fish food". www.gizmag.com. Retrieved 2016-06-08.
  7. ^ Sarker, Pallab K.; Kapuscinski, Anne R.; Lanois, Alison J.; Livesey, Erin D.; Bernhard, Katie P.; Coley, Mariah L. (2016-06-03). "Towards Sustainable Aquafeeds: Complete Substitution of Fish Oil with Marine Microalga Schizochytrium sp. Improves Growth and Fatty Acid Deposition in Juvenile Nile Tilapia ( Oreochromis niloticus )". PLOS ONE. 11 (6): e0156684. doi:10.1371/journal.pone.0156684. ISSN 1932-6203. PMC 4892564. PMID 27258552.
  8. ^ a b c Metz, James G.; Roessler, Paul; Facciotti, Daniel; Levering, Charlene; Dittrich, Franziska; Lassner, Michael; Valentine, Ray; Lardizabal, Kathryn; Domergue, Frederic (2001-07-13). "Production of Polyunsaturated Fatty Acids by Polyketide Synthases in Both Prokaryotes and Eukaryotes". Science. 293 (5528): 290–293. doi:10.1126/science.1059593. ISSN 0036-8075. PMID 11452122.
  9. ^ Matsuda, Takanori; Sakaguchi, Keishi; Hamaguchi, Rie; Kobayashi, Takumi; Abe, Eriko; Hama, Yoichiro; Hayashi, Masahiro; Honda, Daiske; Okita, Yuji (2012-06-01). "Analysis of Δ12-fatty acid desaturase function revealed that two distinct pathways are active for the synthesis of PUFAs in T. aureum ATCC 34304". Journal of Lipid Research. 53 (6): 1210–1222. doi:10.1194/jlr.M024935. ISSN 0022-2275. PMC 3351828. PMID 22368282.
  10. ^ Huang, Jianzhong; Jiang, Xianzhang; Zhang, Xiaowei; Chen, Weihua; Tian, Baoyu; Shu, Zhengyu; Hu, Songnian (2008). "Expressed sequence tag analysis of marine fungus Schizochytrium producing docosahexaenoic acid". Journal of Biotechnology. 138 (1–2): 9–16. doi:10.1016/j.jbiotec.2008.07.1994.


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Schizochytrium: Brief Summary
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Schizochytrium is a genus of unicellular eukaryotes in the family Thraustochytriaceae, which are found in coastal marine habitats. They are assigned to the Stramenopiles (heterokonts), a group which also contains kelp and various microalgae.

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