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. 2017 Nov 30;8:2060. doi: 10.3389/fpls.2017.02060

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Copyright © 2017 Chatterjee, Huma, Shaw and Kundu.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Activity of the chloroplastic malate valve, cytosolic GAPDH and PGK and mitochondrial electron transport chain (ETC) at V_c/V_o = 1 and V_c/V_o = 3. Activity of the chloroplastic malate valve, cytosolic GAPDH, PGK and mitochondrial ETC at (A) V_c/V_o = 1 and (B) normal air condition, V_c/V_o = 3. Reactions names in blue indicate the reactions which showed variation in flux; reaction names in green indicate reactions which showed no variation in flux; reaction names in pink are the ones which were not active at V_c/V_o = 1. Down arrow in red represents decrease in flux of the respective reaction. The flux through the chloroplastic triose phosphate transporters (TPT; ‘chl_PGA_tx’, ‘chl_GAP_tx’, and ‘chl_DHAP_tx’) increased at V_c/V_o = 3. (C) Flux plot for reactions catalyzed by PGK (PHOSGLYPHOS -RXN), GAPDH (GAPOXNPHOSPHN -RXN), GAPN (1.2.1.9-RXN), chloroplastic malate dehydrogenase (chl_MalDH), chloroplastic malate-oxaloacetate shuttle (chl_MalOxAc_tx), mitochondrial complex V (mit_Complex_V), and mitochondrial ATP transporter (mit_ATP_tx). The mit_Complex_V, mit_ATP_tx, PHOSGLYPHOS –RXN, GAPOXNPHOSPHN-RXN, chl_MalDH, and chl_MalOxAc_tx carried varying flux while GAPN carried the same flux. PGA, 3-phosphoglycerate; BPGA, 1,3-bisphosphoglycerate; Mal, malate; OAA, oxaloacetic acid; Pyr, pyruvate; GAP, glyceraldehyde-3-phosphate; Cyt_red, reduced cytochrome; Cyt_Ox, oxidized cytochrome. PGK, phosphoglycerate kinase (EC 2.7.2.3); G3PDH, glyceraldehyde-3-phosphate dehydrogenase (EC 1.2.1.13); GAPN, glyceraldehyde-3-phosphate dehydrogenase (NADP+) (EC 1.2.1.9); GAPDH, glyceraldehyde-3-phosphate dehydrogenase (EC 1.2.1.12); TPI, triose-phosphate isomerase (EC 5.3.1.1); NADP-MDH, NADP-dependent malate dehydrogenase (EC 1.1.1.82); NAD-MDH, NAD-dependent malate dehydrogenase (EC 1.1.1.37).