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Cellular localization of the K+ -dependent Na+ -Ca2+ exchanger NCKX5 and the role of the cytoplasmic loop in its distribution in pigmented cells.

Pigment Cell Melanoma Res. 2019 Jan;32(1):55-67. doi:10.1111/pcmr.12723. Epub 2018 Jul 25
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摘要


NCKX5 is a bidirectional K+ -dependent Na+ -Ca2+ exchanger, which belongs to the SLC24A gene family. In particular, the A111T mutation of NCKX5 has been associated with reduced pigmentation in European populations. In contrast to other NCKX isoforms, which function in the plasma membrane (PM), NCKX5 has been shown to localize either in the trans-Golgi network (TGN) or in melanosomes. Moreover, sequences responsible for retaining its intracellular localization are unknown. This study addresses two major questions: (i) clarification of intracellular location of NCKX5 and (ii) identification of sequences that retain NCKX5 inside the cell. We designed a set of cDNA constructs representing NCKX5 loop deletion mutants and NCKX2-NCKX5 chimeras to address these two questions after expression in pigmented MNT1 cells. Our results show that NCKX5 is not a PM resident and is exclusively located in the TGN. Moreover, the large cytoplasmic loop is the determinant for retaining NCKX5 in the TGN.

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