Fig. 2: Cofactor arrangement of the ETC in the CabRC viewed along the membrane plane and from the periplasmic side.
From: Structure of the Acidobacteria homodimeric reaction center bound with cytochrome c
The center-to-center distances between the cofactors (black dotted lines) are given in Å. The boxed areas show the coordinating environments for all cofactors in the ETC. The cofactors Heme1, Heme2, P840, Acc, A0, and Fe4S4 (FX, FA, and FB) are colored orange, salmon red, green, light blue, cyan, and orange/yellow, respectively. The backbone carbon atoms of PME1002 are colored magenta. Calcium ions (Ca2+) and water molecules (Wat) are shown as spheres and colored gray and red, respectively. For clarity, the tail of PME1002 is omitted in the boxed areas.
