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- W1848896918 abstract "A microsomal fatty acid elongase activity measured in epidermis of rapidly expanding leek (Allium porrum L.) was 10-fold higher in specific activity than preparations from store-bought leek. These preparations elongated acyl chains effectively using endogenous or supplied primers. Elongation of C20:0 was specifically inhibited by 2 [mu]M cerulenin, and labeling experiments with [3H]cerulenin labeled two polypeptides (65 and 88 kD). ATP was required for maximal elongase activity in expanding leaves but was lost in nonexpanding tissues. Both [14C]stearoyl-coenzyme A (CoA) and [14C]stearate were maximally elongated in the presence of ATP. Addition of fully reduced CoA, however, inhibited [14C]stearate elongation, suggesting that stearoyl-CoA synthesis was not a prerequisite for elongation. Furthermore, microsomes preincubated with [14C]stearoyl-CoA plus ATP resulted in loss of radiolabel from the acyl-CoA pool without a corresponding loss in elongating activity. The lack of correlation between elongating activity and the label retained in the putative acyl-CoA substrate pool suggests that acyl-CoAs may not be the immediate precursors for elongation and that ATP plays a critical, yet undefined, role in the elongation process. We propose that an ATP-dependent elongating activity may generate the long-chain fatty acids required for wax biosynthesis." @default.
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- W1848896918 date "1995-10-01" @default.
- W1848896918 modified "2023-09-30" @default.
- W1848896918 title "Fatty Acid-Elongating Activity in Rapidly Expanding Leek Epidermis" @default.
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- W1848896918 doi "https://doi.org/10.1104/pp.109.2.707" @default.
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