Supramolecular Chemistry of Cyclodextrin-Peptide Hybrids: Azobenzene-Tagged Peptides |
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Authors: | Akihiko Ueno Tomoko Shimizu Hisakazu Mihara Keita Hamasaki K Pitchumani |
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Institution: | (1) Department of Chemistry, School of Chemistry, M.K. University, 625 021 Madurai Tamil Nadu, India |
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Abstract: | AC17, which is composed of 17 amino acids and has an azobenzene moiety but has no cyclodextrin (CD) unit in the side chain, exhibits 54% helix content. However, AC17, which has both trans-azobenzene and -CD, shows 82% helix content. This result suggests that the helix structure is stabilized by host (CD)-guest (azobenzene) bridge in the side chain of the peptide. The helix content changed by trans-cis photoisomerization as shown by 64% helix content for AC17 in its cis form. This result suggests that cis-azobenzene unit is excluded from the -CD cavity, thus resulting in the smaller helix content. The helix contents for AC17, which has both azobenzene and -CD, are 94% in the cis form and 87% in the trans form, suggesting that the cis form is included in the -CD cavity. Azobenzene-tagged CD-peptide hybrids with histidine unit were also prepared and photoregulation of catalytic activity in ester hydrolysis was examined. |
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Keywords: | -helix" target="_blank">gif" alt="agr" align="BASELINE" BORDER="0">-helix azobenzene cis-trans photoisomerization cyclodextrin peptide sensor supramolecular chemistry |
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