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. 1978 Mar 7;17(5):911-5.
doi: 10.1021/bi00598a026.

Phase transitions of the purple membranes of Halobacterium halobium

M B Jackson, J M Sturtevant

Phase transitions of the purple membranes of Halobacterium halobium

M B Jackson et al. Biochemistry. .

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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