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- W4288077846 abstract "Abstract Modulation of export of photoassimilates from the chloroplast is essential for controlling the distribution of fixed carbon in the cell and maintaining optimum photosynthetic rates. In this study we identified chloroplast triose phosphate/phosphate translocators 2 and 3 (CreTPT2 and CreTPT3) in the green alga Chlamydomonas reinhardtii that exhibited similar substrate specificities but were differentially expressed over the diel cycle. We focused mostly on analyzing CreTPT3 because of its high level of expression and the severe phenotype exhibited by tpt3 relative to the tpt2 mutants. Null mutants for CreTPT3 had a pleiotropic phenotype that impacted growth, photosynthetic activities, metabolite profiles, carbon partitioning, and organelle-specific accumulation of H 2 O 2 . These analyses demonstrated that CreTPT3 is a dominant conduit on the chloroplast envelope for the transport of photoassimilate. In addition, CreTPT3 can serve as a safety valve that moves excess reductant out of the chloroplast and appears to be essential for preventing the cells from experiencing oxidative stress and accumulating of reactive oxygen species, even under low/moderate light intensities. Finally, our studies indicate subfunctionalization of the CreTPT transporters and suggest that there are differences in managing the export of photoassimilates from the chloroplasts of Chlamydomonas and vascular plants." @default.
- W4288077846 created "2022-07-28" @default.
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- W4288077846 date "2022-07-27" @default.
- W4288077846 modified "2023-10-03" @default.
- W4288077846 title "Chlamydomonas Mutants Null for Chloroplast Triose Phosphate Transporter3 are Metabolically Compromised and Light Sensitive" @default.
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