Journal
APPLIED BIOCHEMISTRY AND MICROBIOLOGY
Volume 46, Issue 2, Pages 166-172Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S0003683810020079
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Methyl esters of fatty acids, free fatty acids, and hydrocarbons were found in the culture liquid and in the cellular lipids of the obligate methylotrophic bacterium Methylophilus quaylei under optimal growth conditions and osmotic stress. The main extracellular hydrophobic metabolite was methyl stearate. Exogenous free fatty acids C(16)-C(18) and their methyl esters stimulated the M. quaylei growth and survivability, as well as production of exopolysaccharide under osmotic and oxidative stress, playing the role of growth factors and adaptogens. The order of hydrophobic supplements according to the ability to stimulate bacterial growth is C(18: 1) > C(18: 0) > C(16: 0) > methyl oleate > methyl stearate > no supplements > C(14: 0) > C(12: 0). The mechanism underlying the protective action of fatty acids and their methyl esters is discussed.
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