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By Ngu T. T. V.

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E. from endogenous CO2 fixation by chloroplasts or from photosynthates produced in leaves. The two main MGDG molecular species found in chloroplasts have (a) 18:3 at both the sn-1 and sn-2 positions of the glycerol backbone, and (b) 18:3 and 16:3 respectively at the sn-1 and sn-2 positions of the glycerol backbone. The occurrence of such structures within plastid membranes reflects the existence of different pathways for the biosynthesis of these two types of molecules. Sulfolipid and phosphatidylglycerol molecular species also contain the typical structure of prokaryotic lipids with C16 fatty acids at the sn-2 position of glycerol.

All together, these observations provide evidence for an extraplastidial location of UDP-galactose synthesis and accumulation. However, this raises the question of the availability of UDP-galactose for MGDG synthesis in plastids. , 1983b), a membrane shown to be impermeable to UDP-galactose (Heber, 1974). Therefore, there is no need for UDP-galactose to accumulate in the plastid stroma only if MGDG synthesis occurs on the outer surface of the inner envelope membrane, but this remains to be demonstrated.

1992). Using isolated intact chloroplasts, Malherbe et al. e. in presence of UDP-galactose or at the early stages of acetate incorporation) and (b) decreased when diacylglycerol levels increased. In vivo, the steady state activity of phosphatidate phosphatase is therefore sensitive to the diacylglycerol/phosphatidic acid molar ratio. Feedback inhibition of phosphatidate phosphatase (and consequently of galactolipid and sulfolipid synthesis) by diacylglycerol might lead to accumulation of phosphatidic acid and therefore will favor phosphatidylglycerol synthesis (see Fig.

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