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Figure 4.
Fig. 4. Detail of the heme-binding region of NP2. The
view is from the back of the heme pocket. Hydrophobic residues
lining the distal pocket are shown along with the distal ligand
(either ammonia or water). On the proximal side of the heme, the
ligand His^57 is shown along with the hydrogen bonding network
involving Asn^67 and an intervening water molecule. Residues
hydrogen bonding with the heme propionate groups are also shown.
Oxygens are indicated by stippled spheres, and nitrogens are
indicated by larger open spheres.
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