Reimport of carbon from cytosolic and vacuolar sugar pools into the Calvin-Benson cycle explains photosynthesis labeling anomalies.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 35259011.
- Also identified by DOI 10.1073/pnas.2121531119 and PMC identifier 8931376.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
SignificancePhotosynthesis metabolites are quickly labeled when <sup>13</sup>CO<sub>2</sub> is fed to leaves, but the time course of labeling reveals additional contributing processes involved in the metabolic dynamics of photosynthesis. The existence of three such processes is demonstrated, and a metabolic flux model is developed to explore and characterize them. The model is consistent with a slow return of carbon from cytosolic and vacuolar sugars into the Calvin-Benson cycle through the oxidative pentose phosphate pathway. Our results provide insight into how carbon assimilation is integrated into the metabolic network of photosynthetic cells with implications for global carbon fluxes.
Medical subject headings
- Carbon
- Metabolic Networks and Pathways
- Photosynthesis
- Sugars