5-Cyanotryptophan As an Infrared Probe of Local Hydration Status of Proteins

Overview

Journal Chem Phys Lett

Date 2010 Feb 18

PMID 20161057

Citations 40

Authors

Matthias M Waegele

Matthew J Tucker

Feng Gai

Affiliations

Soon will be listed here.

Abstract

The nitrile (C≡N) stretching vibration is sensitive to environment, making nitrile-derivatized amino acids an increasingly utilized tool to study various biological processes. Herein, we show that the bandwidth of the C≡N stretching vibration of 5-cyanotryptophan is particularly sensitive to water, rendering it an attractive infrared probe of local hydration status. We confirm the utility of this probe in biological applications by using it to examine how the hydration status of individual tryptophan sidechains of an antimicrobial peptide, indolicidin, changes upon peptide binding to model membranes. Furthermore, we show that p-cyanophenylalanine and 5-cyanotryptophan constitute a useful fluorescence energy transfer pair.

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