Figure 1 - full size

 

Figure 1.
Structure of the ternary complex HasA∼HasR∼heme. HasA (red) and HasR (cork domain beginning with residue Asn-113 in orange; barrel domain beginning at residue Lys-241 in blue) are indicated as a ribbon model. The first 5 strands and the loops L1–L3 of HasR are omitted to allow a view into the barrel interior. The heme is indicated as a wire frame model (green). The extracellular loops 6–11 are labeled. Yellow parts of or near L6, L8, and L9 mark positions of 6 residue deletions that have been found to abolish HasA binding to the receptor.