992,025
edits
Changes
m
KS update 1.1
{{Distinguish|slime mould}}
{{Taxobox
| color = lightgrey
| name = Myxobacteria
| image = Myxococcus xanthus.png
| image_caption = ''[[Myxococcus xanthus]]''
| image_width = 300px
| regnum = [[Bacteria]]
| phylum = [[Proteobacteria]]
| classis = Delta Proteobacteria
| ordo = '''Myxococcales'''}}
The '''myxobacteria''' ("'''slime bacteria'''") are a group of [[bacteria]] that usuallly live in the [[soil]]. They feed on insoluble organic substances. They have very large [[genome]]s compared to other bacteria.<ref>''[[Sorangium cellulosum]]'' has the largest bacterial genome at 13.0 million nucleotides. {{cite journal | author=Schneiker S |display-authors = etal | title=Complete genome sequence of the myxobacterium ''Sorangium cellulosum'' | journal=Nature Biotechnology | year=2007 | pages=1281–1289 | volume=25 | issue=11 | doi=10.1038/nbt1354 | pmid=17965706}}</ref> Myxobacteria are included in the [[deltaproteobacteria|delta group]] of [[proteobacteria]], a large group of [[Gram-negative]] forms.
Myxobacteria move by [[gliding]] on the surface. They travel in ''[[swarm]]s'' with many [[Cell (biology)|cell]]s kept together by intercellular molecular [[Signal transduction|signals]]. The swarm puts out extracellular [[enzyme]]s to digest food. This increases feeding efficiency.
== Life cycle ==
When [[nutrients]] are scarce, myxobacterial cells aggregate into ''fruiting bodies''.<ref name=Kiskowski_2004>{{cite journal | author=Kiskowski MA, Jiang Y, Alber MS | title=Role of streams in myxobacteria aggregate formation | journal=Phys Biol | year=2004 | pages=173–83 | volume=1 | issue=3–4 | pmid=16204837 | doi=10.1088/1478-3967/1/3/005}}</ref><ref name=Sozinova_2005>{{cite journal | author=Sozinova O. |display-authors = etal | title=A three-dimensional model of myxobacterial aggregation by contact-mediated interactions | journal=Proc Natl Acad Sci USA | year=2005 | pages=11308–12 | volume=102 | issue=32 | pmid=16061806 |url=http://www.pnas.org/cgi/content/full/102/32/11308 | doi=10.1073/pnas.0504259102 | pmc=1183571}}</ref> These fruiting bodies are different shapes and colours, depending on the species.
Inside the fruiting bodies, cells develop into rounded myxo[[spores]] with thick cell walls. These myxospores, like [[spore]]s in other organisms, survive until nutrients are more plentiful. Then [[cell growth]] is restarted with a group (swarm) of myxobacteria, not just isolated cells. Similar life cycles have developed among the [[amoebae]] called cellular [[slime mould]]s.
== Uses ==
Myxobacteria produce a number of biomedically and industrially useful chemicals, such as [[antibiotic]]s, and export those chemicals outside of the cell.<ref name=Reichenbach_2001>{{cite journal | author=Reichenbach H | title=Myxobacteria, producers of novel bioactive substances | journal=J Ind Microbiol Biotechnol | year=2001 | pages=149–56 | volume=27 | issue=3 | pmid=11780785 | doi=10.1038/sj.jim.7000025 }}</ref> Some myxobacteria are used as [[model organism]]s for the study of development. At a molecular level, initiation of fruiting body development is regulated by [[Pxr sRNA]].<ref name ="Yu10">{{cite journal |author=Yu Y.T; Yuan X. & Velicer G.J. |title=Adaptive evolution of an sRNA that controls Myxococcus development |journal=Science |volume=328 |issue=5981 |pages=993 |date=2010 |pmid=20489016 |doi=10.1126/science.1187200 |url=http://www.sciencemag.org/cgi/pmidlookup?view=long&pmid=20489016 |accessdate=2010-07-22 |pmc=3027070}}</ref><ref name="Fie06">{{cite journal |author=Fiegna F. |display-authors = etal |title=Evolution of an obligate social cheater to a superior cooperator |journal=Nature |volume=441 |issue=7091 |pages=310–4 |date=2006 |pmid=16710413 |doi=10.1038/nature04677}}</ref>
== References ==
{{reflist}}
[[Category:Gram-negative bacteria]]
{{Taxobox
| color = lightgrey
| name = Myxobacteria
| image = Myxococcus xanthus.png
| image_caption = ''[[Myxococcus xanthus]]''
| image_width = 300px
| regnum = [[Bacteria]]
| phylum = [[Proteobacteria]]
| classis = Delta Proteobacteria
| ordo = '''Myxococcales'''}}
The '''myxobacteria''' ("'''slime bacteria'''") are a group of [[bacteria]] that usuallly live in the [[soil]]. They feed on insoluble organic substances. They have very large [[genome]]s compared to other bacteria.<ref>''[[Sorangium cellulosum]]'' has the largest bacterial genome at 13.0 million nucleotides. {{cite journal | author=Schneiker S |display-authors = etal | title=Complete genome sequence of the myxobacterium ''Sorangium cellulosum'' | journal=Nature Biotechnology | year=2007 | pages=1281–1289 | volume=25 | issue=11 | doi=10.1038/nbt1354 | pmid=17965706}}</ref> Myxobacteria are included in the [[deltaproteobacteria|delta group]] of [[proteobacteria]], a large group of [[Gram-negative]] forms.
Myxobacteria move by [[gliding]] on the surface. They travel in ''[[swarm]]s'' with many [[Cell (biology)|cell]]s kept together by intercellular molecular [[Signal transduction|signals]]. The swarm puts out extracellular [[enzyme]]s to digest food. This increases feeding efficiency.
== Life cycle ==
When [[nutrients]] are scarce, myxobacterial cells aggregate into ''fruiting bodies''.<ref name=Kiskowski_2004>{{cite journal | author=Kiskowski MA, Jiang Y, Alber MS | title=Role of streams in myxobacteria aggregate formation | journal=Phys Biol | year=2004 | pages=173–83 | volume=1 | issue=3–4 | pmid=16204837 | doi=10.1088/1478-3967/1/3/005}}</ref><ref name=Sozinova_2005>{{cite journal | author=Sozinova O. |display-authors = etal | title=A three-dimensional model of myxobacterial aggregation by contact-mediated interactions | journal=Proc Natl Acad Sci USA | year=2005 | pages=11308–12 | volume=102 | issue=32 | pmid=16061806 |url=http://www.pnas.org/cgi/content/full/102/32/11308 | doi=10.1073/pnas.0504259102 | pmc=1183571}}</ref> These fruiting bodies are different shapes and colours, depending on the species.
Inside the fruiting bodies, cells develop into rounded myxo[[spores]] with thick cell walls. These myxospores, like [[spore]]s in other organisms, survive until nutrients are more plentiful. Then [[cell growth]] is restarted with a group (swarm) of myxobacteria, not just isolated cells. Similar life cycles have developed among the [[amoebae]] called cellular [[slime mould]]s.
== Uses ==
Myxobacteria produce a number of biomedically and industrially useful chemicals, such as [[antibiotic]]s, and export those chemicals outside of the cell.<ref name=Reichenbach_2001>{{cite journal | author=Reichenbach H | title=Myxobacteria, producers of novel bioactive substances | journal=J Ind Microbiol Biotechnol | year=2001 | pages=149–56 | volume=27 | issue=3 | pmid=11780785 | doi=10.1038/sj.jim.7000025 }}</ref> Some myxobacteria are used as [[model organism]]s for the study of development. At a molecular level, initiation of fruiting body development is regulated by [[Pxr sRNA]].<ref name ="Yu10">{{cite journal |author=Yu Y.T; Yuan X. & Velicer G.J. |title=Adaptive evolution of an sRNA that controls Myxococcus development |journal=Science |volume=328 |issue=5981 |pages=993 |date=2010 |pmid=20489016 |doi=10.1126/science.1187200 |url=http://www.sciencemag.org/cgi/pmidlookup?view=long&pmid=20489016 |accessdate=2010-07-22 |pmc=3027070}}</ref><ref name="Fie06">{{cite journal |author=Fiegna F. |display-authors = etal |title=Evolution of an obligate social cheater to a superior cooperator |journal=Nature |volume=441 |issue=7091 |pages=310–4 |date=2006 |pmid=16710413 |doi=10.1038/nature04677}}</ref>
== References ==
{{reflist}}
[[Category:Gram-negative bacteria]]