Fig. 2
From: Cryo-EM structure of the RC-LH core complex from an early branching photosynthetic prokaryote
Architecture of the reaction center. a The cartoon presentation of the L and M subunits in side view (left) and top view (right), and the cofactors are shown as spheres. b The topology diagram of L and M subunits. The TM7 (light pink) is an independent transmembrane helix in the current complex. c The cofactors in L and M subunits. To highlight the cofactors, the apoprotein of L- and M subunits are shown as 70% transparency. The amino acids coordinate the BChl, and iron ion are shown in sticks and labeled. d, e The cartoon (d) and topology (e) diagram of the Cyt c subunit, the hemes are shown as red sticks. f Structural comparison of the Cyt c subunit from T. tepidum (gray) and R. castenholzii (wheat). g The residues that coordinate heme 4 are different between T. tepidum (gray, accession code 3WMM) and R. castenholzii (wheat). The color codes for R. castenholzii are the same as Fig. 1
