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- W1565382010 abstract "The regulation of the nature and quantity of the fatty acids produced in vivo by Acholeplasma laidlawii B in the presence of various exogenous fatty acids has been investigated. In the presence of exogenous medium- or long-chain fatty acids, the organism appears to reduce the amounts of de novo biosynthesized fatty acids in its cellular lipid pool by two distinct mechanisms: an excretion of biosynthesized fatty acids to the growth medium as free fatty acids, and a reduction in total de novo biosynthetic output. These two mechanisms do not suffice to maintain constant total membrane lipid levels, but they do appear to significantly moderate the effect of exogenous fatty acids on the level of membrane lipid. In the presence of short-chain fatty acids, total membrane lipid levels are not elevated. Exogenous fatty acids can cause shifts in the average chain length of de novo biosynthesized fatty acids; the magnitudes and directions of these shifts can be correlated with the specificity of the exogenous species for esterification to the 1- or the 2-position of the glycerol moiety of membrane glycerolipids. As the various endogenously synthesized fatty acids differ in their positional specificity for glycerolipid esterification, we propose that the competition of an exogenous species with significant specificity for a particular position with the endogenously derived fatty acids specific for that position can selectively depress the synthesis of such endogenously derived species, thereby altering the overall product spectrum of de novo fatty acid biosynthesis in vivo." @default.
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- W1565382010 date "1977-08-01" @default.
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- W1565382010 title "Membrane lipid biosynthesis in Acholeplasma laidlawii B" @default.
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- W1565382010 doi "https://doi.org/10.1016/0003-9861(77)90526-4" @default.
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