Figure 3 - full size

 

Figure 3.
FIG. 3. The least squares superimposed structures of wild-type human Mn-SOD (purple) and H30N/Y166F Mn-SOD (yellow) showing residues in the active site. Similar to Asn171(B) in the single mutant, this side chain turned toward subunit A in the double mutant, but there is no hydrogen bond between Asn171(B) and Asn30(A). Instead, the N -2 of Asn30 formed a weak hydrogen bond with the phenolic OH of Tyr34.

The above figure is reprinted by permission from the ASBMB: J Biol Chem (2004, 279, 5861-5866) copyright 2004.