Effects of Pressure and Temperature on the M412 Intermediate of the Bacteriorhodopsin Photocycle. Implications for the Phase Transition of the Purple Membrane

Overview

Journal Biophys J

Publisher Cell Press

Specialty Biophysics

Date 1983 Nov 1

PMID 6652216

Citations 7

Authors

M Tsuda

R Govindjee

T G Ebrey

Affiliations

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Abstract

The effects of pressure and temperature on the decay kinetics of the M412 (M) intermediate in the photocycle of bacteriorhodopsin were studied to provide information about the phase transitions of the purple membrane lipids. The activation volume (delta V++) for the decay of M is expected to be different below and above a phase transition. However, no abrupt change in delta V++ was found from 3.5 degrees to 60 degrees C. But a sharp break was observed in a plot of the logarithm of the rate of M decay vs. pressure. Extrapolation of this break point to standard atmospheric pressure gives a temperature of -42 degrees C, which probably corresponds to the phase transition of the purple membrane lipids. This conclusion is supported by studies of the effect of pressure on the M kinetics of bacteriorhodopsin incorporated into dimyristoylphosphatidylcholine vesicles, whose phase transition has previously been characterized.

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