Ultrafast Excited-State Dynamics of the Photoswitchable Protein Dronpa

Dronpa is a photoswitchable protein from the family of green fluorescent proteins (GFPs). Photoswitching involves forward and backward proton transfer between a bright deprotonated form (B) and a dark protonated form (A2). We have used femtosecond transient absorption spectroscopy to determine the k...

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Veröffentlicht in:Journal of the American Chemical Society 2007-04, Vol.129 (16), p.4870-4871
Hauptverfasser: Fron, Eduard, Flors, Cristina, Schweitzer, Gerd, Habuchi, Satoshi, Mizuno, Hideaki, Ando, Ryoko, De Schryver, Frans C, Miyawaki, Atsushi, Hofkens, Johan
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container_end_page 4871
container_issue 16
container_start_page 4870
container_title Journal of the American Chemical Society
container_volume 129
creator Fron, Eduard
Flors, Cristina
Schweitzer, Gerd
Habuchi, Satoshi
Mizuno, Hideaki
Ando, Ryoko
De Schryver, Frans C
Miyawaki, Atsushi
Hofkens, Johan
description Dronpa is a photoswitchable protein from the family of green fluorescent proteins (GFPs). Photoswitching involves forward and backward proton transfer between a bright deprotonated form (B) and a dark protonated form (A2). We have used femtosecond transient absorption spectroscopy to determine the kinetics of the first step of the photoconversion from the dark to the bright form, which we have measured as 4 ps. The 2-fold isotope effect on the kinetics of this process shows that excited-state proton transfer (ESPT) is involved in this step. It was also demonstrated that the acid-induced protonated form A1 and the photoconverted protonated form A2 are two distinct spectroscopic species.
doi_str_mv 10.1021/ja069365v
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subjects Animals
Anthozoa - metabolism
Green Fluorescent Proteins - chemistry
Photochemistry
Spectrum Analysis
title Ultrafast Excited-State Dynamics of the Photoswitchable Protein Dronpa
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