Fig. 4: Interactions between the Cyt subunit and LH1 α-polypeptides. | Communications Biology

Fig. 4: Interactions between the Cyt subunit and LH1 α-polypeptides.

From: An LH1–RC photocomplex from an extremophilic phototroph provides insight into origins of two photosynthesis proteins

Fig. 4

a Left panel shows a top view of interactions from the periplasmic side between the Rpi. globiformis α-polypeptides (chain 3, orange; chain S, red; chain U, yellow; chain W, turquoise blue) and the Cyt subunit (transparent cyan); arrow heads indicate the overlapping C-terminal regions between the Rpi. globiformis α-polypeptides and the Alc. tepidum α3-polypeptide (PDB: 7VRJ, gray) and the α2- or α4-polypeptide of Trv. strain 970 (PDB: 7C9R, black). Other color scheme: LH1-α, green; LH1-β, slate blue. Right panel is a side view showing the four Rpi. globiformis α-polypeptides (colored) interacting with the Cyt subunit. For comparison, the Alc. tepidum α3-polypeptide and the α2- or α4-polypeptide of Trv. strain 970 are shown by gray and black cartoons, respectively. b Alignment of the C-terminal amino acid sequences of the α-polypeptides between Rpi. globiformis, Alc. tepidum and Trv. strain 970. Bold letters indicate residues in the overlapping regions of the structures. Symbol scheme: identical (*), conservative (:), semi-conservative (.). Upper colored bars represent regions of the Rpi. globiformis α-polypeptides that interact with the Cyt subunit. The color code is the same as in a.

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