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Issue 14, 2010

Photodetachment of tryptophan anion: an optical probe of remote electron

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Abstract

The UV photoexcitation spectrum of deprotonated tryptophan anion is presented. Singly deprotonated amino-acid tryptophan has been produced in an electrospray ionization source, isolated in a quadrupole ion trap and photoexcited with a UV tunable laser, resulting in the photodetachment of the excess electron. Whereas no influence of the proton on the UV spectrum of tryptophan was previously reported (Phys. Chem. Chem. Phys., 2004, 6, 2633; J. Chem. Phys., 2005, 122, 074310), we observe a strong bathochromism due to the presence of the negatively charged group in the vicinity of the chromophore. An excellent agreement with TD-DFT (time dependent density functional theory) predictions for the absorption spectrum of the lowest energy conformer is found. The sensitivity of the tryptophan chromophore to the presence of a remote negative charge offers new perspectives for charge mapping in large biomolecules.

Graphical abstract: Photodetachment of tryptophan anion: an optical probe of remote electron

Supplementary files

Article information


Submitted
27 Oct 2009
Accepted
22 Dec 2009
First published
27 Jan 2010

Phys. Chem. Chem. Phys., 2010,12, 3399-3403
Article type
Paper

Photodetachment of tryptophan anion: an optical probe of remote electron

I. Compagnon, A. Allouche, F. Bertorelle, R. Antoine and P. Dugourd, Phys. Chem. Chem. Phys., 2010, 12, 3399 DOI: 10.1039/B922514P

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