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. Author manuscript; available in PMC: 2013 Nov 6.
Published in final edited form as: Biochemistry. 2012 Oct 29;51(44):8755–8763. doi: 10.1021/bi301115c

Figure 5.

Figure 5

Structure of alternative substrate 4NC bound in the active site of the Y257F variant (PDB 4GHE). (A) Interactions between bound 4NC and residues in the active site (subunit C). Red dashed lines show hydrogen bonds (Å). Gray dashed lines indicate bonds or potential bonds to iron (Å). Additional distances are given in Table S3. Atom color code: gray, carbon (enzyme); yellow, carbon (4NC); blue, nitrogen; red, oxygen; purple, iron (Y257F). (B) Comparison of active site environments in the FeHPCD-4NC (PDB 4GHH) and Y257F-4NC (PDB 4GHE) complexes. Atom color code: gray, carbon (FeHPCD); yellow, carbon (Y257F); blue, nitrogen; dark red, oxygen (FeHPCD); red, oxygen (Y257F); bronze, iron (FeHPCD); purple, iron (Y257F). Additional rotated view for structure overlay in panel B is shown in Figure S3B.