The Ca2+-ATPase of the Scallop Sarcoplasmic Reticulum Is of a Cold-adapted Type

The Ca2+-ATPase of the Scallop Sarcoplasmic Reticulum Is of a Cold-adapted Type At 0 to 20°C, the Ca2+-ATPase activity of the scallop sarcoplasmic reticulum (SR) was observed to be 7–60% of the peak activity at 30°C, while the ATPase activity of the rabbit SR was 0–7% of its peak at 55°C. The relative rabbit ATPase activity (0.7–7.0%) at 7–20°C became higher (6–15 times) and lower (1/4–1/2), respectively, by the solubilization of the rabbit ATPase with a detergent, dodecyloctaethylenglycol monoether, and by the reconstitution of the ATPase with asolectin (soybean lecithin). No activity at 0°C remained irrespective of these treatments. The relative scallop ATPase activity at 0–20°C was, however, scarcely affected by such solubilization and reconstitution. In contrast to the rabbit ATPase, the scallop ATPase seems to be capable of operating independently without the help of the membrane lipid at low temperature. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The Journal of Membrane Biology Springer Journals

The Ca2+-ATPase of the Scallop Sarcoplasmic Reticulum Is of a Cold-adapted Type

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Publisher
Springer-Verlag
Copyright
Copyright © 2003 by Springer-Verlag New York Inc.
Subject
Philosophy
ISSN
0022-2631
eISSN
1432-1424
D.O.I.
10.1007/s00232-003-0622-2
Publisher site
See Article on Publisher Site

Abstract

At 0 to 20°C, the Ca2+-ATPase activity of the scallop sarcoplasmic reticulum (SR) was observed to be 7–60% of the peak activity at 30°C, while the ATPase activity of the rabbit SR was 0–7% of its peak at 55°C. The relative rabbit ATPase activity (0.7–7.0%) at 7–20°C became higher (6–15 times) and lower (1/4–1/2), respectively, by the solubilization of the rabbit ATPase with a detergent, dodecyloctaethylenglycol monoether, and by the reconstitution of the ATPase with asolectin (soybean lecithin). No activity at 0°C remained irrespective of these treatments. The relative scallop ATPase activity at 0–20°C was, however, scarcely affected by such solubilization and reconstitution. In contrast to the rabbit ATPase, the scallop ATPase seems to be capable of operating independently without the help of the membrane lipid at low temperature.

Journal

The Journal of Membrane BiologySpringer Journals

Published: Jan 1, 2003

References

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