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Elucidation of photo-induced electron transfer in a loop-forming peptide: Dye-Ala-Gly-Gln-Tyr
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 Title & Authors
Elucidation of photo-induced electron transfer in a loop-forming peptide: Dye-Ala-Gly-Gln-Tyr
Lee, Hwiin; Kim, Jeongyun; Kwon, Yong-Uk; Lee, Minyung;
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 Abstract
We investigated photo-induced electron transfer (PET) in a dye-labeled peptide, fluorophore-Ala-Gly-Gln-Tyr, employing time-resolved fluorescence. As an effort to develop new functional dyes, we studied an acriflavine derivative for the electron-acceptor in the excited state from tyrosine, an electrondonor in the ground-state. The pH dependence of the fluorescence lifetime of the model peptide indicates that electron transfer between the excited dye and tyrosine occurs when the tyrosine is deprotonated. The proton-coupled electron transfer appears to be sequential rather than concerted. We also report direct time measurements on the end-to-end loop formation processes of the peptide in water.
 Keywords
acriflavine;tyrosine;fluorescence quenching;peptide conformation;proton-coupled electron transfer;
 Language
English
 Cited by
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