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. 2021 May;498(1):170-176.
doi: 10.1134/S1607672921030030. Epub 2021 Jun 29.

Temperature Dependence of Tryptophan Fluorescence Lifetime as an Indicator of Its Microenvironment Dynamics

V V Gorokhov  1 , B N Korvatovsky  2 , P P Knox  2 , N P Grishanova  2 , S N Goryachev  2 , V Z Pashchenko  2 , A B Rubin  2
Affiliations

Temperature Dependence of Tryptophan Fluorescence Lifetime as an Indicator of Its Microenvironment Dynamics

V V Gorokhov et al. Dokl Biochem Biophys. 2021 May.

Abstract

The spectral-kinetic characteristics of the fluorescence of the tryptophan molecule in an aqueous solution and in the composition of a protein (albumin) were studied in the temperature range from -170 to 25°C. To explain the observed changes in the spectra and the tryptophan fluorescence lifetime with temperature, a model of transitions between the excited and ground states involving a charge-transfer state was used, which takes into account the nonlinear nature of the dynamics of these transitions. In these processes, an important role is played by the interaction of tryptophan molecules with its microenvironment, as well as rearrangements in the system of hydrogen bonds of the water-protein matrix surrounding the tryptophan molecule.

Keywords: fluorescence; hydrogen bonds; molecular dynamics; tryptophan.

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References

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