Ground-state Proton Transfer in the Photoswitching Reactions of the Fluorescent Protein Dronpa

Overview

Journal Nat Commun

Specialty Biology

Date 2013 Feb 14

PMID 23403562

Citations 16

Authors

Mark M Warren

Marius Kaucikas

Ann Fitzpatrick

Paul Champion

J Timothy Sage

Jasper J van Thor

Affiliations

Soon will be listed here.

Abstract

The reversible photoswitching between the 'on' and 'off' states of the fluorescent protein Dronpa involves photoisomerization as well as protein side-chain rearrangements, but the process of interconversion remains poorly characterized. Here we use time-resolved infrared measurements to monitor the sequence of these structural changes, but also of proton transfer events, which are crucial to the development of spectroscopic contrast. Light-induced deprotonation of the chromophore phenolic oxygen in the off state is a thermal ground-state process, which follows ultrafast (9 ps) trans-cis photoisomerization, and so does not involve excited-state proton transfer. Steady-state infrared difference measurements exclude protonation of the imidazolinone nitrogen in both the on and off states. Pump-probe infrared measurements of the on state reveal a weakening of the hydrogen bonding between Arg66 and the chromophore C=O, which could be central to initiating structural rearrangement of Arg66 and His193 coinciding with the low quantum yield cis-trans photoisomerization.

Citing Articles

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