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. Author manuscript; available in PMC: 2012 Jul 1.
Published in final edited form as: J Photochem Photobiol B. 2011 Mar 17;104(1-2):60–71. doi: 10.1016/j.jphotobiol.2011.01.026

Figure 4.

Figure 4

Structure of a beta hairpin peptide, IMDRYRVRNGDRIHIRLR, in which a tyrosine-histidine pi-pi interaction lowers the tyrosine redox potential and a PCET reaction occurs between tyrosine and histidine. (A) shows the primary sequence and some of the predicted hydrogen bonds and cross strand interactions; (B) is the overlap of the 20 lowest energy 2-D NMR structures, with only five amino acid side chains shown (see part A, green); and (C) is the redox active tyrosine and its immediate environment in the averaged, minimized NMR structure. Predicted hydrogen bonds are shown with dashed lines. Reprinted with permission from [112]. Copyright year 2007 American Chemical Society.