Structural characterization of core-bradavidin in complex with biotin
Fig 2
Comparison (stereo view) of the biotin-binding residues (sticks) of core-bradavidin (orange; bold labels) [PDB:4BBO] and chicken Avd (cyan; labels in brackets) [PDB:1AVD].
The Cα traces were superimposed. Trp99 (Trp110 in Avd) is shown from subunit III; other residues are from subunit I. The bound biotin ligands are drawn as thick sticks. Nitrogen atoms are shown in blue, oxygen atoms in red and sulfur atoms in yellow. Water molecules are drawn as red spheres and H-bonds for core-bradavidin as grey dashed lines (distances in Ångströms; * = 2.8 Å).