Phase Transitions of the Purple Membranes of Halobacterium Halobium

Overview

Journal Biochemistry

Specialty Biochemistry

Date 1978 Mar 7

PMID 629940

Citations 33

Authors

M B Jackson

J M STURTEVANT

Affiliations

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Abstract

Purple membranes of Halobacterium halobium were studied by differential scanning calorimetry. No transition was detected at temperatures below 70 degrees C. A small endothermic transition was seen at about 80 degrees C and a larger one at 100 degrees C. The larger transition is the irreversible denaturation of bacteriorhodopsin. The smaller transition is accompanied by a change in the visible absorption spectrum and is believed to be reversible, involving a cooperative change in crystalline structure of the membrane.

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