Fluorescence resonance energy transfer in a novel cyclodextrin-peptide conjugate for detecting steroid molecules |
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Authors: | Hossain Mohammed Akhter Mihara Hisakazu Ueno Akihiko |
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Affiliation: | Department of Bioengineering, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8501, Japan |
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Abstract: | A novel cyclodextrin conjugated peptide, 1, having two different fluorophores, coumarin and pyrene, in the side chains has been designed and synthesized. The circular dichroism study reveals that 1 shows typical -helix pattern, and forms intramolecular inclusion complex with coumarin. The fluorescence emission study shows that the peptide exhibits intramolecular fluorescence resonance energy transfer (FRET) without quenching of two fluorophores. We have determined the binding constants of 1 for various biologically important steroid molecules as guests using the guest-responsive variation in the fluorescence emission intensity of coumarin. |
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