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- W3107515105 abstract "Abstract Plants employ photosynthesis to produce sugars for supporting their growth. During photosynthesis, an enzyme Ribulose 1,5 bisphosphate carboxylase/oxygenase (Rubisco) combines its substrate Ribulose 1,5 bisphosphate (RuBP) with CO 2 to produce phosphoglycerate (PGA). Alongside, Rubisco also takes up O 2 and produce 2-phosphoglycolate (2-PG), a toxic compound broken down into PGA through photorespiration. Photorespiration is not only a resource-demanding process but also results in CO 2 loss which affects photosynthetic efficiency in C 3 plants. Here, we propose to circumvent photorespiration by adopting the cyanobacterial glycolate decarboxylation pathway into C 3 plants. For that, we have integrated the cyanobacterial glycolate decarboxylation pathway into a kinetic model of C 3 photosynthetic pathway to evaluate its impact on photosynthesis and photorespiration. Our results show that the cyanobacterial glycolate decarboxylation bypass model exhibits a 10% increase in net photosynthetic rate ( A ) in comparison with C 3 model. Moreover, an increased supply of intercellular CO 2 (C i ) from the bypass resulted in a 54.8% increase in PGA while reducing photorespiratory intermediates including glycolate (− 49%) and serine (− 32%). The bypass model, at default conditions, also elucidated a decline in phosphate-based metabolites including RuBP (− 61.3%). The C 3 model at elevated level of inorganic phosphate (Pi), exhibited a significant change in RuBP (+ 355%) and PGA (− 98%) which is attributable to the low availability of C i . Whereas, at elevated Pi, the bypass model exhibited an increase of 73.1% and 33.9% in PGA and RuBP, respectively. Therefore, we deduce a synergistic effect of elevation in CO 2 and Pi pool on photosynthesis. We also evaluated the integrative action of CO 2 , Pi, and Rubisco carboxylation activity (V cmax ) on A and observed that their simultaneous increase raised A by 26%, in the bypass model. Taken together, the study potentiates engineering of cyanobacterial decarboxylation pathway in C 3 plants to bypass photorespiration thereby increasing the overall efficiency of photosynthesis." @default.
- W3107515105 created "2020-12-07" @default.
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- W3107515105 date "2020-11-30" @default.
- W3107515105 modified "2023-10-03" @default.
- W3107515105 title "A cyanobacterial photorespiratory bypass model to enhance photosynthesis by rerouting photorespiratory pathway in C3 plants" @default.
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- W3107515105 doi "https://doi.org/10.1038/s41598-020-77894-2" @default.
- W3107515105 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7705653" @default.
- W3107515105 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/33257792" @default.
- W3107515105 hasPublicationYear "2020" @default.
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