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A designed protein binding-pocket to control excited-state intramolecular proton transfer fluorescence

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Abstract

Excited-state intramolecular proton transfer involves a photochemical isomerization and creates the opportunity for the emission of two distinct wavelengths of light from a single fluorophore. The selectivity between these two wavelengths of emission is dependent on the environment around the fluorophore and suggests the possibility for ratiometric monitoring of protein microenvironments. Unfortunately, nonspecific binding of ESIPT fluorophores does not often lead to dramatic changes in the ratio between the two wavelengths of emission. A protein binding pocket was designed to selectively discriminate between the two channels of emission available to an ESIPT fluorophore. This work is significant because it demonstrates that specific interactions between the protein and the fluorophore are essential to realize strong ratiometric differences between the two possible wavelengths of emission. The design strategies proposed here lead to an ESIPT fluorophore that can discern subtle differences in the interface between two proteins.

Graphical abstract: A designed protein binding-pocket to control excited-state intramolecular proton transfer fluorescence

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Publication details

The article was received on 29 Oct 2018, accepted on 26 Nov 2018 and first published on 28 Nov 2018


Article type: Paper
DOI: 10.1039/C8OB02673D
Citation: Org. Biomol. Chem., 2019, Advance Article
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    A designed protein binding-pocket to control excited-state intramolecular proton transfer fluorescence

    B. J. Lampkin, C. Monteiro, E. T. Powers, P. M. Bouc, J. W. Kelly and B. VanVeller, Org. Biomol. Chem., 2019, Advance Article , DOI: 10.1039/C8OB02673D

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