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Figure 5.
FIGURE 5. Crystal structure of E. coli NapA. A, view of
NapA from E. coli with the different domains colored as follows:
domain I (residues 1–59, 492–520, and 590–630) in red;
domain II (residues 60–138, 375–491, and 521–589) in
green; domain III (residues 139–374) in yellow; and domain IV
(residues 631–791) in blue. The regions colored gray are the
extra loop regions not present in the D. desulfuricans NAP (9).
The [4Fe-4S] cluster and the Mo-bis-MGD cofactors are shown in
ball and stick format and are colored black. B, view of the
4Fe4S cluster and Mo-bis-MGD cofactor showing the conserved
water molecule that is coordinated by Lys-47 and one of the MGD
moieties.
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