Journal
TRENDS IN PLANT SCIENCE
Volume 18, Issue 12, Pages 673-679Publisher
ELSEVIER SCIENCE LONDON
DOI: 10.1016/j.tplants.2013.09.006
Keywords
endosymbiosis; metabolite transport; plastid evolution
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Funding
- French Ministry of Education
- Centre National de in Recherche Scientifique (CNRS)
- Agence Nationale pour la recherche (Menage a Trois)
- Deutsche Forschungsgemeinschaft [EXC 1028, SFB TR1]
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The endosymbiont hypothesis proposes that photosynthate from the cyanobiont was exported to the cytosol of the eukaryote host and polymerized from ADP-glucose into glycogen. Chlamydia-like pathogens are the second major source of foreign genes in Archaeplastida, suggesting that these obligate intracellular pathogens had a significant role during the establishment of endosymbiosis, likely through facilitating the metabolic integration between the endosymbiont and the eukaryotic host. In this opinion article, we propose that a hexose phosphate transporter of chlamydial origin was the first transporter responsible for exporting photosynthate out of the cyanobiont. This connection pre-dates the recruitment of the host-derived carbon translocators on the plastid inner membranes of green and red algae, land plants, and photosynthetic organisms of higher order endosymbiotic origin.
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