Fig 3. Binding interface between complement FH19-20 (chain F, grey cartoon) and OspE of Borrelia burgdorferi (chain I, pink surface).

Interface is shown from two directions about 180° apart with the interacting residues shown in ball-and-stick. Binding is mediated via domain 20 of FH19-20. 13 hydrogen bonds in the interface are marked with dashed lines. Residues involved are annotated using a bold font for the amino acids from OspE and normal font for FH.