Host origin of plastid solute transporters in the first photosynthetic eukaryotes |
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Authors: | Heather M Tyra Marc Linka Andreas PM Weber Debashish Bhattacharya |
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Affiliation: | Department of Biological Sciences and Roy J Carver Center for Comparative Genomics, 446 Biology Building, University of Iowa, Iowa City, IA 52242-1324, USA. heather-tyra@uiowa.edu |
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Abstract: | Background It is generally accepted that a single primary endosymbiosis in the Plantae (red, green (including land plants), and glaucophyte algae) common ancestor gave rise to the ancestral photosynthetic organelle (plastid). Plastid establishment necessitated many steps, including the transfer and activation of endosymbiont genes that were relocated to the nuclear genome of the 'host' followed by import of the encoded proteins into the organelle. These innovations are, however, highly complex and could not have driven the initial formation of the endosymbiosis. We postulate that the re-targeting of existing host solute transporters to the plastid fore-runner was critical for the early success of the primary endosymbiosis, allowing the host to harvest endosymbiont primary production. |
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