green alga
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2022 ◽  
Vol 5 (1) ◽  
Author(s):  
Yutaro Oishi ◽  
Rie Otaki ◽  
Yukari Iijima ◽  
Eri Kumagai ◽  
Motohide Aoki ◽  
...  

AbstractMembrane lipid remodeling contributes to the environmental acclimation of plants. In the green lineage, a betaine lipid, diacylglyceryl-N,N,N-trimethylhomoserine (DGTS), is included exclusively among green algae and nonflowering plants. Here, we show that the green alga Chlorella kessleri synthesizes DGTS under phosphorus-deficient conditions through the eukaryotic pathway via the ER. Simultaneously, phosphatidylcholine and phosphatidylethanolamine, which are similar to DGTS in their zwitterionic properties, are almost completely degraded to release 18.1% cellular phosphorus, and to provide diacylglycerol moieties for a part of DGTS synthesis. This lipid remodeling system that substitutes DGTS for extrachloroplast phospholipids to lower the P-quota operates through the expression induction of the BTA1 gene. Investigation of this lipid remodeling system is necessary in a wide range of lower green plants for a comprehensive understanding of their phosphorus deficiency acclimation strategies.


Author(s):  
Totsapon Pewnual ◽  
Narirat Jampapetch ◽  
Sathonkorn Saladtook ◽  
Wuttinun Raksajit ◽  
Rachaneekorn Klinsalee ◽  
...  

2021 ◽  
Author(s):  
Théo Le Moigne ◽  
Edoardo Sarti ◽  
Antonin Nourisson ◽  
Alessandra Carbone ◽  
Stéphane D. Lemaire ◽  
...  

The Calvin-Benson cycle fixes carbon dioxide into organic triosephosphates through the collective action of eleven conserved enzymes. Regeneration of ribulose-1,5-bisphosphate, the substrate of Rubisco-mediated carboxylation, requires two lyase reactions catalyzed by fructose-1,6-bisphosphate aldolase (FBA). While cytoplasmic FBA has been extensively studied in non-photosynthetic organisms, functional and structural details are limited for chloroplast FBA encoded by oxygenic phototrophs . Here we determined the crystal structure of plastidial FBA from the unicellular green alga Chlamydomonas reinhardtii (Cr). We confirm that CrFBA folds as a TIM barrel, describe its catalytic pocket and homo-tetrameric state. Multiple sequence profiling classified the photosynthetic paralogs of FBA in a distinct group from non-photosynthetic paralogs. We mapped the sites of thiol- and phospho-based post-translational modifications known from photosynthetic organisms and predict their effects on enzyme catalysis.


CYTOLOGIA ◽  
2021 ◽  
Vol 86 (4) ◽  
pp. 283-289
Author(s):  
Tsuyoshi Takeshita ◽  
Kaori Takita ◽  
Kotaro Ishii ◽  
Yusuke Kazama ◽  
Tomoko Abe ◽  
...  

2021 ◽  
Vol 60 ◽  
pp. 102535
Author(s):  
Noam Shahar ◽  
Tamar Elman ◽  
Rosalind Williams-Carrier ◽  
Oren Ben-Zvi ◽  
Iftach Yacoby ◽  
...  

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