Fig. 3: Ca2+- and BChl a-binding sites in the Alc. vinosum LH1 complex. | Communications Biology

Fig. 3: Ca2+- and BChl a-binding sites in the Alc. vinosum LH1 complex.

From: High-resolution structure and biochemical properties of the LH1–RC photocomplex from the model purple sulfur bacterium, Allochromatium vinosum

Fig. 3

a Tilted view of the cofactor arrangement with the periplasm above and the cytoplasm below. b A typical Ca2+-binding site in the pair of α1/β3-polypeptides. c Hydrogen-bonding network (black dashed lines) formed by water molecules (cyan balls) around the Ca2+-binding site. A salt-bridge is formed between α1-Asp47 and β3-Arg44 (red dotted line). d A typical BChl a-binding site in an α1/β3 subunit showing that α1-Trp44 and β3-Trp46 coordinate to Ca2+ with their mainchain oxygens and form hydrogen bonds through their sidechains with the BChl a C3-acetyl groups.

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