Figure 4
From: Crystal structure of Escherichia coli YidC, a membrane protein chaperone and insertase

Structural mapping of substrate-contacting residues.
(A), Mapping of the substrate-contacting residues. (B), (C), Close-up views of the boxed areas in A. The residues bound to Sec-independent substrates are shown as spheres, colored green (the Pf3 coat protein), pink (MifM), brown (Foc) and dark green (both the Pf3 coat protein and Foc) and viewed from the membrane (upper) and periplasmic (lower) sides (B). The residues bound to the Sec-independent substrate, FtsQ, are shown as orange spheres (C). The P1 domain was removed for clarity.