Bowman, JP, Methylococcaceae, Bergey's Manual of Systematics of Archaea and Bacteria, John Wiley & Sons, Inc and Bergey's Manual Trust, WB Whitman et al (ed), United Kingdom, pp. 1-8. ISBN 9781118960608 (2018) [Revised Book Chapter]
Me.thy.lo.coc.ca.ce'ae. N.L. masc. n. Methylococcus type genus of the family; ‐aceae ending to denote a family; N.L. gem. pl. n. Methylococcaceae the Methylococcus family.
Proteobacteria / Gammaproteobacteria / Methylococcales / Methylococcaceae
Cells are Gram‐negative, cocci to rods, 0.5–4.0 × 0.5–2.0 μm. Some species appear as sheathed filaments up to 2 cm long and 1–6 µm wide. Species may be motile via a single, unsheathed polar flagellum or nonmotile. Form type I intracytoplasmic membranes appearing as stacks of vesicular discs. Cells usually contain polyhydroxyalkanoate and polyphosphate granules. Some species form cyst‐like resting bodies that provide different degrees of desiccation resistance but not heat resistance. Do not form spores or exospores. Some species are mildly thermophilic, while some others are psychrophilic. Most described species are mesophiles. Most species grow best around neutral pH. Occur widely in terrestrial and marine environments that receive methane flux. Marine species require Na+ ions for growth. Do not occur in hypersaline environments. Strictly aerobic. Some species grow best at low O2 tensions. Most species are catalase and oxidase positive. Type I (type Ia and Ib) methanotrophs. Usually only utilize methane and methanol as sole sources of carbon and energy. Methane is always oxidized by particulate methane monooxygenase. Soluble methane monooxygenase activity is rare. Carbon is mainly assimilated via the ribulose monophosphate pathway. Some strains can couple methanotrophy to denitrification (forming nitrous oxide) when at low O2 tensions. Some strains can fix CO2 via ribulose 1,5‐diphosphate carboxylase. Several species can fix atmospheric nitrogen. Most species can use both inorganic and organic forms of nitrogen. Main fatty acids include saturated and monounsaturated fatty acids of C14 or C16 chain lengths with type depending on the genus and species. Main lipoquinones are either ubiquinone‐8 or 18‐methylene‐ubiquinone‐8. Main polar lipids include phosphatidylglycerol and/or phosphatidylethanolamine.
DNA G + C content (mol%): 40–69 (Tm, HPLC, genome analysis).
Type genus: Methylococcus Foster and Davis 1966, 1929AL emend. Bowman, Sly, Nichols and Hayward 1993, 748VP.
|Item Type:||Revised Book Chapter|
|Keywords:||Methylococcales methane bacteria taxonomy|
|Research Division:||Biological Sciences|
|Research Field:||Microbial ecology|
|Objective Division:||Expanding Knowledge|
|Objective Group:||Expanding knowledge|
|Objective Field:||Expanding knowledge in the environmental sciences|
|UTAS Author:||Bowman, JP (Associate Professor John Bowman)|
|Deposited By:||TIA - Research Institute|
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