Fig. 3
From: Cryo-EM structure of the RC-LH core complex from an early branching photosynthetic prokaryote
Structure of the light-harvesting antenna. a Two side views with 90° increment presenting an LHαβ-heterodimer of R. castenholzii with cofactors. The neighboring α-apoprotein and B800 are shown with 70% transparency. The BChls (purple), keto-γ-carotene molecules (orange), and their coordinating residues are shown in sticks. b An LHαβ-heterodimer of R. castenholzii (purple) is compared with the LH1 of T. tepidum (blue, accession code 3WMM) and Rhodops. palustris (cyan, accession code 1PYH). A zoom-in view of the B800 coordination is shown in the inset. c An LHαβ-heterodimer of R. castenholzii (purple) is compared with the LH2 of Rhodospirillum molischianum (wheat, accession code 1LGH) and LH2 (orange, accession code 1NKZ) and LH3 (pale green, accession code 1IJD) of Rhodopseudomonas acidophila. The inset shows a zoom-in view of the B800 coordination. d The distances between each B880 pigment and the central plane of B880 pigments ring-array are calculated and plotted to show the planarity of the B880 pigment arrangement for different core complexes, rcRC–LH (purple), ttRC–LH1 (blue), and rpRC–LH1 (cyan)
