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. 2011 Sep 12;2:50. doi: 10.3389/fpls.2011.00050

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Copyright © 2011 Facchinelli and Weber.

This is an open-access article subject to a non-exclusive license between the authors and Frontiers Media SA, which permits use, distribution and reproduction in other forums, provided the original authors and source are credited and other Frontiers conditions are complied with.

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Characterized and putative metabolite transporters of the glaucophaye Cyanophora paradoxa (A) and the rhodophyte Galdieria sulphuraria (B). Proposed model of carbon export from C. paradoxa based on uptake experiments with isolated cyanelles. The identity of the transporter responsible for the TPT activity is not elucidated yet (A). Characterized metabolite transporters of G. sulphuraria and their substrate specificities. The GsTPT, unlike for the green plant chloroplasts, is unable to transport 3-PGA pointing to the presence of an alternate reduction shuttle in the red algae (B). Abbreviations: ADP-Glc, ADP-glucose; ETC, electron transport chain; Glc 1-P, glucose 1-phosphate; Glc 6-P, glucose 6-phosphate; GPT, glucose 6-phosphate/phosphate translocator; NTT, nucleoside triphosphate transporter; OPPP, oxidative pentose phosphate pathway; 3-PGA, 3-phosphoglyceric acid; PEP, phosphoenolpyruvate; Pi, inorganic phosphate; PPT, PEP/phosphate translocator; TP, triose phosphate; TPT, triose phosphate/phosphate translocator; UDP-Glc, UDP-glucose; UDP-Gal, UDP-galactose.