Abstract
Phosphoenolpyruvate carboxylase (PEPC) is the primary acceptor of carbon dioxide in C4 photosynthesis. Three isozymes of PEPC: PEPC1, PEPC2, and PEPC3, in the single cell, C4 plant Bienertiasinuspersici Akhani were determined in this study. Differential expressions of these isoforms were observed at different stages of leaf development. Amino acid sequence alignment revealed that PEPC1, PEPC2, and PEPC3 had characteristics of C3-C4 PEPC type, C4 PEPC, and C3 PEPC, respectively. Gene expression profiles showed that PEPC3 was highly expressed in young leaves while PEPC1 and PEPC2 were more expressed in intermediate and mature leaves, respectively. Using immunoblotting, we also assessed tissue-specific expression and post-translational modifications (PTMs) of PEPC in B. sinuspersici. During leaf maturation, phosphorylation at Ser 11 and monoubiquitination at Lys 629 were highly increased. The phosphorylation pattern on PEPC was diurnally regulated but monoubiquitination was not. Moreover, dimorphic chloroplasts from B. sinuspersici chlorenchyma cell of mature leaf were isolated to study spatial localization of PEPC by PTM. Monoubiquitinated PEPC were specifically interacting with peripheral chloroplasts. These results indicated that phosphorylation and monoubiquitination on PEPC were mutually exclusive as well as affecting spatial localization in single cell C4 plants.
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ACKNOWLEDGMENTS
We thank Dr. Plaxton for the antisera against PEPC and phospho-PEPC and Dr. Offermann for some helpful discussion.
Funding
This work was carried out with the support of “Cooperative Research Program for Agriculture Science and Technology Development” (project no. PJ01095306) Rural Development Administration, Republic of Korea.
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The authors declare that they have no conflict of interest. This article does not contain any studies involving animals or human participants performed by any of the authors.
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Abbreviations: CC—central cell; PC—peripheral cell; PEPC—phosphoenolpyruvate carboxylase; PTM—post-translational modification; PPDK—phosphoenolpyruvate dikinase.
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Caburatan, L., Kim, J. & Park, J. Expression Profiles and Post-Translational Modifications of Phosphoenolpyruvate Carboxylase Isozymes of Bienertia sinuspersici during Leaf Development. Russ J Plant Physiol 66, 738–747 (2019). https://doi.org/10.1134/S1021443719050042
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DOI: https://doi.org/10.1134/S1021443719050042