Characterization of two Ca-ATPases in gill epithelium from the killifish (Fundulus heteroclitus) |
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| Authors: | M J Paul C J Burdick |
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| Institution: | Physiology Department, Tulane Medical School, New Orleans, Louisiana 70112. |
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| Abstract: | 1. Two Ca-ATPases in the gill microsomal fraction from the killifish (Fundulus heteroclitus) have been characterized. 2. A (Ca2+ + Mg2+)-ATPase which has a high affinity for Ca2+, requires Mg2+ for activity and may be stimulated by calmodulin. 3. A (Ca2+ + Na+)-ATPase which has a low affinity for Ca2+ requires Na+ for activity, does not require Mg2+ and is probably not stimulated by calmodulin. 4. These enzymes may play a physiological role in killifish calcium regulation. |
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