[The biology and osmoadaptation of haloalkaliphilic methanotrophs].
There is increasing evidence for the presence and activity of methanotrophic bacteria in saline and alkaline aquatic environments located in different ecogeographical regions. Alkalitolerant halophilic and alkaliphilic halotolerant methanotrophs of type I were found to be able to utilize methane and methanol, to oxidize ammonium ions, and to transform various organic compounds in a wide range of water salinities (up to 12% NaCl) and pH values (from 5 to 11). The ecophysiological importance of methanotrophs in microbial communities inhabiting saline and alkaline aquatic environments is due to their involvement in the global cycles of methane and major bioelements (C, N, and S). Specific cyto- and biochemical properties of haloalkaliphilic methanotrophs--the synthesis of osmoprotectants (ectoine, 5-hydroxyproline, and sucrose), the accumulation of potassium ions, the formation of glycoprotein S layers on the outer surface of their cell walls, and the modification of the chemical composition of their membranes--allow them to adapt to highly saline and alkaline habitats. Due to their specific properties, haloalkaliphilic methanotrophs may become of use in modern biotechnology.
Trotsenko
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IuA
Skryabin Institute of Biochemistry and Physiology of Microorganisms, Russian Academy of Sciences, pr. Nauki 5, Pushchino, Moscow Oblast, 142290 Russia.
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D000222:Adaptation, Physiological; D000473:Alkanes / Q000378:metabolism*; D000599:Amino Acids, Diamino / Q000096:biosynthesis; D005618:Fresh Water / Q000382:microbiology; D006090:Gram-Negative Bacteria / Q000166:cytology* / Q000378:metabolism / Q000502:physiology*; D006219:Halogens / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D006909:Hydroxyproline / Q000096:biosynthesis; D008565:Membrane Proteins / Q000378:metabolism; D008697:Methane / Q000378:metabolism*; D000432:Methanol / Q000378:metabolism; D009995:Osmosis; D011188:Potassium / Q000378:metabolism; D000644:Quaternary Ammonium Compounds / Q000378:metabolism; D012965:Sodium Chloride; D013395:Sucrose / Q000378:metabolism; D014871:Water Microbiology
D000473:Alkanes; D000599:Amino Acids, Diamino; D006219:Halogens; D008565:Membrane Proteins; D000644:Quaternary Ammonium Compounds; D012965:Sodium Chloride; D013395:Sucrose; C045628:ectoine; D008697:Methane; D006909:Hydroxyproline; D011188:Potassium; D000432:Methanol