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J Biol Chem, Vol. 273, Issue 7, 4155-4162, February 13, 1998
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From the Departments of We have isolated a novel cDNA clone from rat
cerebral cortex encoding a protein of 670 amino acids (NCKX2) that has
significant similarity to the 1199-amino acid-long Na/Ca-K exchanger of
bovine rod outer segment (NCKX1). NCKX2 transcripts are 10.5 kilobase pairs in length and are expressed abundantly in neurons throughout the
brain and with much lower abundance in selected other tissues. The
predicted topology of the rat NCKX2 protein is very similar to that of
bovine NCKX1, beginning with a solitary transmembrane segment (M0),
which is removed as a "signal peptide" in bovine NCKX1, an
extracellular loop, a cluster of five transmembrane spanning segments
(M1 to M5), a long cytoplasmic loop, and a final hydrophobic cluster
(M6 to M11). Within the hydrophobic clusters, rat NCKX2 shares 80%
identity and 91% similarity with bovine NCKX1. The two larger
hydrophilic loops are much shorter in NCKX2 than in NCKX1, accounting
largely for the difference in length between the two proteins, and are
dissimilar in sequence except for a 32-amino acid stretch with 69%
identity in the cytosolic loop. NCKX2 was epitope-tagged in the
extracellular domain and was shown to be expressed at the surface of
transfected HEK cells. Analysis of NCKX2 function by fluorescent
imaging of fura-2-loaded transfected cells demonstrated that NCKX2 is a
potassium-dependent sodium/calcium exchanger.
Medical Biochemistry and
§§ Neuroscience, University of Calgary, Calgary,
Alberta T2N 4N1, Canada and the ¶ Renal Division, Department of
Medicine, Brigham and Women's Hospital and Harvard Medical School,
Boston, Massachusetts 02115
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