Dimer-1 (Red) Dimer-2 (Yellow) Bond forming atoms of residues of Dimer-1 Bond forming atoms of residues of Dimer-2 Bond-Distance (Å) Ileu 48 Ileu45 CD1 CD1 2.2 Leu51 Ileu45 CD1 CG2 1.3 Val54 Met90 CG1 CE 2.9 Tyr84 Ala92 OH CB 3.8 Tyr84 Val93 O CG1 3.9 Gln46 Ileu97 NE2 CD1 2.2 Ileu 97 Leu100 CG2 CD1 1.5 leu91 Gln46 O NE2 4.8

Table 3: Detail of bond formation by interacting atoms and residue of the CagC dimers with another CagC dimers for formation of quaternary complex.