Fig. 4: Comparison of interfaces between the last incorporated subunit and the chaperone FimC in complexes FimDHGFA_nC, FimDHGFA_nIC_His and FimDHGFC.

a Overview of interactions between subunit FimA_n and FimC in the FimDHGFA_nC complex (model (IV)). Hydrogen bonds are displayed as dashed blue lines. Most of the hydrogen bonds are found between the G1 strand of FimC and the neighboring F and A2 strands of FimA_n. A second interface displayed in the inset can be found between residues of the A1’ strand of FimC and the A’ strand of FimA_n. b Overview of interactions between subunit FimI and FimC in the FimDHGFA_nIC_His complex (model (XIII)). Hydrogen bonds are displayed as dashed blue lines. Again, most of the hydrogen bonds are found between the G1 strand of FimC and the neighboring F and A2 strands of FimI. A second interface (inset) can be found between residues of the A1’ and B1 strand of FimC and the A’ strand of FimI. c Overview of interactions between subunit FimF and FimC in the FimDHGFC complex (PDB-ID 6E14²²). Hydrogen bonds are displayed as dashed blue lines. Again, most of the hydrogen bonds are found between the G1 strand of FimC and the neighboring F strand of FimF. A second interface (inset) can be found between residues of the A1’ strand of FimC and the A’ strand of FimF.