Mollicutes is a class of bacteria[2] distinguished by the absence of a cell wall. The word "Mollicutes" is derived from the Latin mollis (meaning "soft" or "pliable"), and cutis (meaning "skin"). Individuals are very small, typically only 0.2–0.3 μm (200-300 nm) in size and have a very small genome size. They vary in form, although most have sterols that make the cell membrane somewhat more rigid. Many are able to move about through gliding, but members of the genus Spiroplasma are helical and move by twisting. The best-known genus in the Mollicutes is Mycoplasma.
Mollicutes are parasites of various animals and plants, living on or in the host's cells. Many cause diseases in humans, attaching to cells in the respiratory or urogenital tracts, particularly species of Mycoplasma and Ureaplasma. Phytoplasma and Spiroplasma are plant pathogens associated with insect vectors.
Whereas formerly the trivial name "mycoplasma" has commonly denoted any member of the class Mollicutes, it now refers exclusively to a member of the genus Mycoplasma.
Mollicutes | |
---|---|
Scientific classification | |
Domain: | Bacteria |
Phylum: | Tenericutes |
Class: | Mollicutes Edward and Freundt 1967[1] |
Orders | |
Acholeplasmatales |
https://en.wikipedia.org/wiki/Mollicutes
Tenericutes (tener cutis: soft skin) is a phylum of bacteria that contains the class Mollicutes. The name was validated in 1984 as a new division (phylum).[3][4][5] Notable genera include Mycoplasma, Spiroplasma, Ureaplasma, and Phytoplasma.
https://en.wikipedia.org/wiki/Tenericutes
At first, all members of the class Mollicutes were generally named "mycoplasma" or pleuropneumonia-like organism (PPLO). Mollicutes other than some members of genus Mycoplasma were still unidentified. The first species of Mycoplasma/Mollicutes, that could be isolated was Mycoplasma mycoides. This bacterium was cultivated by Nocard and Roux in 1898.[4]
In 1962, R.G.E. Murray proposed to divide the kingdom Bacteria into three divisions (= phyla) on the basis of the cell wall types:
- Gram-negative Gracilicutes, with a thin cell wall and little peptidoglycan;
- Gram-positive "Firmacutes", with a thicker cell wall and more peptidoglycan (the name was later changed in "Firmicutes"), and
- the "Mollicutes", without a cell wall.[6]
https://en.wikipedia.org/wiki/Mollicutes
https://nikiyaantonbettey.blogspot.com/search?q=extrachromosomal+DNA
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