Fig. 5: Structural comparison of the monomers in the dimer.
From: Asymmetric structure of the native Rhodobacter sphaeroides dimeric LH1–RC complex
a Top view of superposition of the Cα carbons of the RC M-subunits between monomer A (colored) and monomer B (gray) shown by ribbon representations and viewed from the periplasmic side. Color scheme for the proteins in monomer A is the same as in Fig. 1. PufX (X, x) and protein-U (U, u) are indicated by their chain ID (X and U in monomer A, x and u in monomer B). The RC H-subunits are omitted for clarity. Two αβ-subunits in monomer B indicated by their chain ID 05, 06, 07, and 08 are largely deviated from the corresponding polypeptides in monomer A (chain ID 5, 6, 7 and 8). b Similar superposition between monomer A (colored) and a monomeric Rba. sphaeroides LH1–RC (gray, PDB: 7F0L) reported previously. c–e Structures of protein-U with their density maps at a contour level of 4σ in monomer A (c), monomer B (d), and the monomeric core complex (e). Dotted lines indicate the position of Phe46 of protein-U. Most parts of protein-U in monomer B are disordered.
