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. 2009 Apr 9;48(17):3708–3716. doi: 10.1021/bi802177g

Figure 4.

Figure 4

Representative conserved nearby waters and aromatic residues of quenched Trps in HγD-Crys. (A) The two crystallographic water molecules (yellow oxygens) that most stabilize the electron transfer from the indole ring to the amide backbone of Trp68 in the HγD-Crys (PDB code 1HK0). These sites do not appear to be accessible, but Wat132 is trapped by an additional H-bond to Gln142 and/or Phe56, and Wat137 is usually also H-bonded to Ser72. (B) Representative conserved proximity of the backbone carbonyl bond of n − 3 residues before the nonfluorescent Trps (residue n) in the HγD-Crys.