Picosecond and Steady State, Variable Intensity and Variable Temperature Emission Spectroscopy of Bacteriorhodopsin

Overview

Journal Biophys J

Publisher Cell Press

Specialty Biophysics

Date 1978 Sep 1

PMID 698343

Citations 8

Authors

S L SHAPIRO

A J Campillo

A Lewis

G J Perreault

J P Spoonhower

R K Clayton

W Stoeckenius

Affiliations

Soon will be listed here.

Abstract

The bacteriorhodopsin emission lifetime at 77 degrees K has been obtained for different regions of the emission spectrum with single-pulse excitation. The data under all conditions yield a lifetime of 60 +/- 15 ps. Intensity effects on this lifetime have been ruled out by studying the relative emission amplitude as a function of the excitation pulse energy. We relate our lifetime to previously reported values at other temperatures by studying the relative emission quantum efficiency as a function of temperature. These variable temperature studies have indicated that an excited state with an emission maximum at 670 nm begins to contribute to the spectrum as the temperature is lowered. Within our experimental error the picosecond data seem to suggest that this new emission may arise from a minimum of the same electronic state responsible for the 77 degrees K emission at 720 nm. A correlation is noted between a 1.0-ps formation time observed in absorption by Ippen et al. (Ippen, E.P., C.V. Shank, A. Lewis, and M.A. Marcus. 1978. Subpicosecond spectroscopy of bacteriorhodopsin. Science [wash. D.C.]. 200:1279-1281 and a time extrapolated from relative quantum efficiency measurements and the 77 degrees K fluorescence lifetime that we report.

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