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. 1995 Jan 3;14(1):58–67. doi: 10.1002/j.1460-2075.1995.tb06975.x

The C-terminal 165 amino acids of the plasma membrane Ca(2+)-ATPase confer Ca2+/calmodulin sensitivity on the Na+,K(+)-ATPase alpha-subunit.

T Ishii 1, K Takeyasu 1
PMCID: PMC398052  PMID: 7828596

Abstract

The C-terminal 165 amino acids of the rat brain plasma membrane (PM) Ca(2+)-ATPase II containing the calmodulin binding auto-inhibitory domain was connected to the C-terminus of the ouabain sensitive chicken Na+,K(+)-ATPase alpha 1 subunit. Expression of this chimeric molecule in ouabain resistant mouse L cells was assured by the high-affinity binding of [3H]ouabain. In the presence of Ca2+/calmodulin, this chimeric molecule exhibited ouabain inhibitable Na+,K(+)-ATPase activity; the putative chimeric ATPase activity was absent in the absence of Ca2+/calmodulin and activated by Ca2+/calmodulin in a dose-dependent manner. Furthermore, this chimeric molecule could bind monoclonal IgG 5 specific to the chicken Na+,K(+)-ATPase alpha 1 subunit only in the presence of Ca2+/calmodulin, suggesting that the epitope for IgG 5 in this chimera is masked in the absence of Ca2+/calmodulin and uncovered in their presence. These results propose a direct interaction between the calmodulin binding auto-inhibitory domain of the PM Ca(2+)-ATPase and the specific regions of the Na+,K(+)-ATPase alpha 1 subunit that are structurally homologous to the PM Ca(2+)-ATPase. A comparison of the deduced amino acid sequences revealed several possible regions within the Na+,K(+)-ATPase that might interact with the auto-inhibitory domain of the PM Ca(2+)-ATPase.

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Selected References

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