Mediates the export of fixed carbons from the chloroplasts into the cytosol in the form of triose phosphates. In addition, it can also bind and transport phosphoenolpyruvate, thereby increasing the photosynthetic efficiency of C4-plants. Homodimer. Located in zones of contact between the inner and outer membrane of the chloroplast. Belongs to the TPT transporter family. TPT (TC 2.A.7.9) subfamily.