Betaine, a compatible solute in the extremely halophilic phototrophic bacteriumEctothiorhodospira halochloris
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چکیده
منابع مشابه
Betaine is the main compatible solute of halophilic eubacteria.
A number of moderately halophilic bacteria of diverse taxonomic groups have been studied to determine the intracellular concentrations of organic compounds at various salt concentrations. Betaine was accumulated in all of these organisms in proportion to the salinity of the medium, suggesting that this compound plays a major role in osmoregulation.
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Halorhodospira halochloris is an extremely halophilic bacterium isolated from hypersaline Wadi Nantrun lakes in Egypt. Here we report the draft genome sequence of this gammaproteobacteria (GI number: 589289709, GenBank Accession number: CP007268). The 3.5-Mb genome encodes for photosynthesis and biosynthesis of organic osmoprotectants. Comparison with the genome of H.halophila promises to yield...
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Many bacteria can accumulate glycine betaine for osmoprotection and catabolize it as a growth substrate, but how they regulate these opposing roles is poorly understood. In Pseudomonas syringae B728a, expression of the betaine catabolism genes was reduced by an osmotic upshift to an intermediate stress level, consistent with betaine accumulation, but was increased by an upshift to a high stress...
متن کاملGlycine betaine transport in the obligate halophilic archaeon Methanohalophilus portucalensis.
Transport of the osmoprotectant glycine betaine was investigated using the glycine betaine-synthesizing microbe Methanohalophilus portucalensis (strain FDF1), since solute uptake for this class of obligate halophilic methanogenic Archaea has not been examined. Betaine uptake followed a Michaelis-Menten relationship, with an observed K(t) of 23 microM and a V(max) of 8 nmol per min per mg of pro...
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ژورنال
عنوان ژورنال: FEMS Microbiology Letters
سال: 1982
ISSN: 0378-1097,1574-6968
DOI: 10.1111/j.1574-6968.1982.tb08287.x