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. 2019 Aug 16;116(35):17147–17155. doi: 10.1073/pnas.1902026116

Fig. 3.

Fig. 3.

MCE domain protein TGD2 mediates PA transport in chloroplasts. The tgd1-4 genes in plant chloroplasts encode for multiple components of a PA import complex. The sn-2 position of PA differs depending on its origin: ER-derived PA has 18 carbon fatty acids, whereas plastid-derived PA has 16 carbon fatty acids, although the degree of unsaturation can vary. (Left) With the TGD1–4 system intact, the plastid is capable of both de novo synthesis and import of PA. As such, the PA precursor pool contains a roughly equivalent mixture (for A. thaliana) of both species. (Right). A deletion of any tgd1-4 genes eliminates the ability of the plastid to import PA from the ER. As such, the resultant pool of PA in the plastid is de novo-synthesized. We are depicting the deletion of tgd; however, a deletion of any individual component has been demonstrated to eliminate PA import.