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• W2062620587 abstract "The capacity of intact chloroplasts to synthesize long chain fatty acids from acetate depends on the stroma pH in Spinacia oleracea, U. S. hybrid 424. The pH optimum is close to 8.5. Lowering of the stroma pH leads to a reduction of acetate incorporation but does not suffice to eliminate fatty acid synthesis completely. Chain elongation from palmitic to oleic acid shows the same pH dependence. Fatty acid synthesis is activated in the dark upon the simultaneous addition of dihydroxyacetone phosphate and orthophosphate supplying ATP and oxaloacetate for reoxidation of NADPH in the stroma. Under these conditions both dark fatty acid synthesis and synthesis of oleate from palmitate show the same pH dependence as in the light. Dark fatty acid synthesis is further stimulated by increasing the stromal Mg2+ concentration with the ionophore A 23187. In contrast to CO2 fixation, dark fatty acid synthesis is considerably reduced by dithiothreitol (DTT). This observation may be due to an acetyl-CoA deficiency, caused by a nonenzymic acylation of DTT, and a competition for ATP between DTT-activated CO2 fixation and fatty acid synthesis. Because d,l-glyceraldehyde as inhibitor of CO2 fixation compensates the DTT effect on dark fatty acid synthesis, reducing equivalents may be involved in the light dependence of acetate activation." @default.
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• W2062620587 date "1983-09-01" @default.
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• W2062620587 title "On the Light Dependence of Fatty Acid Synthesis in Spinach Chloroplasts" @default.
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• W2062620587 doi "https://doi.org/10.1104/pp.73.1.11" @default.
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