TY  - JOUR
A1  - Küken, Anika
A1  - Sommer, Frederik
A1  - Yaneva-Roder, Liliya
A1  - Mackinder, Luke C. M.
A1  - Hoehne, Melanie
A1  - Geimer, Stefan
A1  - Jonikas, Martin C.
A1  - Schroda, Michael
A1  - Stitt, Mark
A1  - Nikoloski, Zoran
A1  - Mettler-Altmann, Tabea
T1  - Effects of microcompartmentation on flux distribution and metabolic pools in Chlamydomonas reinhardtii chloroplasts
JF  - eLife
N2  - Cells and organelles are not homogeneous but include microcompartments that alter the spatiotemporal characteristics of cellular processes. The effects of microcompartmentation on metabolic pathways are however difficult to study experimentally. The pyrenoid is a microcompartment that is essential for a carbon concentrating mechanism (CCM) that improves the photosynthetic performance of eukaryotic algae. Using Chlamydomonas reinhardtii, we obtained experimental data on photosynthesis, metabolites, and proteins in CCM-induced and CCM-suppressed cells. We then employed a computational strategy to estimate how fluxes through the Calvin-Benson cycle are compartmented between the pyrenoid and the stroma. Our model predicts that ribulose-1,5-bisphosphate (RuBP), the substrate of Rubisco, and 3-phosphoglycerate (3PGA), its product, diffuse in and out of the pyrenoid, respectively, with higher fluxes in CCM-induced cells. It also indicates that there is no major diffusional barrier to metabolic flux between the pyrenoid and stroma. Our computational approach represents a stepping stone to understanding microcompartmentalized CCM in other organisms.
Y1  - 2018
U6  - https://doi.org/10.7554/eLife.37960
SN  - 2050-084X
VL  - 7
PB  - eLife Sciences Publications
CY  - Cambridge
ER  -