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. Author manuscript; available in PMC: 2013 Mar 14.
Published in final edited form as: J Am Chem Soc. 2012 Mar 6;134(10):4753–4761. doi: 10.1021/ja210535w

Figure 4. Crystal structures showing the orientation of Y244 and Y129.

Figure 4

(Left) Crystal structure showing the orientation of Y244 and His240. The Cα—Cβ bond is 31.3° to the plane of the phenol ring. Assuming sp3 geometry, the β-methylene protons are calculated to be 61.3° and 58.7° to the perpendicular axis to the phenol plane. (Right) Crystal structure showing the orientation of Y129. The Cα—Cβ bond is 0.3° to the plane of the phenol ring, and the β-methylene protons are 30.3° and 29.7° to the perpendicular axis of the phenol plane. The inset defines the positions on the tyrosine.