Membrane lipid modification and stearoyl-coenzyme A desaturase activity in L-M cells

Add time:08/11/2019    Source:sciencedirect.com

The stearoyl-coenzyme A desaturase system of L-M cells, grown as monolayers, was examined in microsomal membranes that contained 8.2% phosphatidylisopropylethanolamine, an unnatural phospholipid analog. Desaturation of both [1-14C]stearic acid by whole cells and [1-14C]stearoyl-coenzyme A by cell-free homogenates, or microsomes, was decreased to about 40% of control levels in cells that had been grown for 24 h in the presence of 10 mmN-isopropylethanolamine. No decrease in microsomal NADH- or NADPH-dependent cytochrome c reductase activities or the level of cytochrome b5 was found in the L-M cells that had been treated for 24 h with N-isopropylethanolamine. Although amino acid transport into L-M cells was not affected by treatment with N-isopropylethanolamine, protein synthesis was decreased by about 30%. These results indicate that the decrease in stearoyl-coenzyme A desaturation in the modified membranes is specifically associated with the terminal oxidase activity (cyanide-sensitive factor) of the desaturase enzyme complex.

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