Figure 3.
Fig. 3. Representative section of the electron density map.
Stereoview of the final 3F[obs]-2F[calc] electron density map
(blue) at a resolution of 2.7 Å is contoured at 1.5 , showing
the ferrichrome-iron binding site, including water molecules.
The ferrichrome-iron molecule is shown in yellow, and the iron
atom is indicated as a large red sphere. Select side-chain
residues (Glu98, Gly99, and Gln100 from apex B; Tyr116 from apex
C; Tyr244 and Trp246 from L3; Phe^313 from 7; Phe^391
from 9; and
Phe^702 from 21) and the
two water molecules (Wat151 and Wat154) found in the binding
site are labeled (34) and colored white and red, respectively.
, showing
the ferrichrome-iron binding site, including water molecules.
The ferrichrome-iron molecule is shown in yellow, and the iron
atom is indicated as a large red sphere. Select side-chain
residues (Glu98, Gly99, and Gln100 from apex B; Tyr116 from apex
C; Tyr244 and Trp246 from L3; Phe^313 from 
7; Phe^391
from