Figure 6.

Zoomed-in view of the crystal structure of a model Fc domain (PDB: 3AVE). The backbone amide hydrogen is depicted in blue and the carbonyl oxygen is depicted in red. Glycans (Man3GlcNAc4Fuc1) are depicted as yellow sticks. The glycosylation site N300 is highlighted with light blue sticks, residues D268 and E297 are highlighted with magenta sticks and K249 is highlighted with red sticks. Green dotted lines represent stable H-bonds identified by Swiss PDB Viewer with default values. Note that Protein Data Bank file 3AVE has a different amino acid numbering. Subtracting 3 from the number used here corresponds to the numbering in 3AVE.