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. 2021 Mar 26;33(6):2072–2091. doi: 10.1093/plcell/koab092

Figure 7.

Figure 7

The ferredoxin bridge of Arabidopsis complex I. In the closed conformation, subunit B14 of the peripheral arm forms a bridge with the ACP (also designated SDAP2; purple) and the complex I ferredoxin C1-FDX (pink). Ferredoxin connects ACP with the membrane arm (ND2) near the gamma carbonic anhydrase domain (orange). The ND1 loop linking TMH5 and TMH6 of the ND1 subunit in the membrane arm (white) is down. The angle between the membrane and peripheral arms is set to 106°. In the open conformation, the bridge seems to be disrupted; the ACP (light pink) and F1-FDX (orange) subunits are disordered or (partially) absent; the ND1 loop flips to the “up” position, and the angle between the two complex I arms relaxes to 112°. Membrane, gray.