Journal
PLANT JOURNAL
Volume 106, Issue 1, Pages 113-132Publisher
WILEY
DOI: 10.1111/tpj.15149
Keywords
chloroplast; CpSRP pathway; diatoms; gene editing; Phaeodactylum tricornutum; photosynthesis
Categories
Funding
- Research Council of Norway [267474, 239001]
- NTNU enabling technologies program
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Loss of CpSRP54 in the diatom affects the accumulation of chloroplast-encoded subunits and photophysiological responses, but the phenotype is relatively mild due to the activation of mechanisms alleviating the loss of CpSRP54. This suggests that plants, green algae, and diatoms have evolved differences in the pathways for inserting proteins into thylakoid membranes during translation and post-translation.
The chloroplast signal recognition particle 54 kDa (CpSRP54) protein is a member of the CpSRP pathway known to target proteins to thylakoid membranes in plants and green algae. Loss of CpSRP54 in the marine diatom Phaeodactylum tricornutum lowers the accumulation of a selection of chloroplast-encoded subunits of photosynthetic complexes, indicating a role in the co-translational part of the CpSRP pathway. In contrast to plants and green algae, absence of CpSRP54 does not have a negative effect on the content of light-harvesting antenna complex proteins and pigments in P. tricornutum, indicating that the diatom CpSRP54 protein has not evolved to function in the post-translational part of the CpSRP pathway. Cpsrp54 KO mutants display altered photophysiological responses, with a stronger induction of photoprotective mechanisms and lower growth rates compared to wild type when exposed to increased light intensities. Nonetheless, their phenotype is relatively mild, thanks to the activation of mechanisms alleviating the loss of CpSRP54, involving upregulation of chaperones. We conclude that plants, green algae, and diatoms have evolved differences in the pathways for co-translational and post-translational insertion of proteins into the thylakoid membranes.
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