TAILIEUCHUNG - Báo cáo Y học: In vivo activation of plasma membrane H+-ATPase hydrolytic activity by complex lipid-bound unsaturated fatty acids in Ustilago maydis

As an adaptation process to the growth retardation provoked by the presence of nonlethal concentrations of ergosterol biosynthesis inhibitors, Ustilago maydis alters the ratio of linoleic to oleic acid bound to plasma membrane ´ complex lipids [Hernandez, A., Cooke, ., Lewis, M. & Clarkson, . (1997) Microbiology 143, 3165–3174]. This alteration increases plasma membrane H+-ATPase hydrolytic activity. | Eur. J. Biochem. 269 1006-1011 2002 FEBS 2002 In vivo activation of plasma membrane H -ATPase hydrolytic activity by complex lipid-bound unsaturated fatty acids in Ustilago maydis Agustin Hernandez1 David T. Cooke2 and David T. Clarkson1 1IACR-Long Ashton Research Station Department of Agricultural Sciences University of Bristol Long Ashton UK department of Biological Sciences University of Bristol Bristol UK As an adaptation process to the growth retardation provoked by the presence of nonlethal concentrations of ergosterol biosynthesis inhibitors Ustilago maydis alters the ratio of linoleic to oleic acid bound to plasma membrane complex lipids Hernandez A. Cooke . Lewis M. Clarkson . 1997 Microbiology 143 3165-3174 . This alteration increases plasma membrane H -ATPase hydrolytic activity. Activation of H -ATPase by the linoleic oleic acid proportion is noncompetitive nonessential and only involves changes in the maximum velocity of the pump. Optimum pH affinity to MgATP and constants for the inhibition by vanadate and erythrosin B remain unchanged. This all indicates that activation of plasma membrane H -ATPase by unsaturated fatty acids differs clearly from glucose-induced activation observed in yeast. Also it is a physiologically relevant event similar to other as yet uncharacterized changes in plasma membrane H -ATPase hydrolytic activity observed in plants and fungi as part of an adaptation process to different stress conditions. Keywords enzyme activation H -ATPase unsaturated fatty acid Ustilago maydis xenobiotic stress. Several physiological factors have been reported to influence plasma membrane H -ATPase enzyme activity. In fungi these include salt stress 1 glucose 2 acid pH during growth 3 nitrogen starvation 4 carbon starvation 5 ethanol 6 and copper 7 . In plants other factors have been shown to alter enzyme activity for example auxin 8 turgor 9 hormones 10 growth temperature 11 and toxic compounds such as heavy metals or xenobiotics 12 . .

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