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. 2014 May 28;12(6):3218–3230. doi: 10.3390/md12063218

Figure 3.

Figure 3

The scheme of the putative polar lipids and eicosapentaenoic acid (EPA) synthesis pathway in Fistulifera solaris. The plastid in this strain is considered to be surrounded by four membranes. Fatty acids and the prokaryotic lipids are de novo synthesized in the primary plastid. The eukaryotic lipids are de novo synthesized in the endoplasmic reticulum. The EPA was synthesized through the sequential desaturation of C18 fatty acid on PC. The acyl-editing and head group exchange processes on PC could not only provide EPA-CoA and EPA containing DAGs for the synthesis of other EPA-containing lipids but also promote the synthesis of the PC species maintain two C16 fatty acids. TAG in this figure is specified as the EPA-containing prokaryotic TAG. Arrow-headed lines represent synthesis, while dashed arrow-headed line represents transportation. OB, oil body; PS, periplastidal space; FAS, fatty acid synthesis; PLA, phospholipase A; LPCAT, acyl-CoA, lyso-phosphatidylcholine acyltransferase; PDCT, phosphatidylcholine diacylglycerol cholinephosphotransferase; FFA, free fatty acid; PDAT, phospholipid, diacylglycerol actyltransferase; DGAT, acyl-CoA, diacylglycerolacyltransferase; ELO,elongase.