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- W2123452666 endingPage "830" @default.
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- W2123452666 abstract "Sodium-dependent dicarboxylate transporters (NaDC) include low-affinity NaDC1 and high-affinity NaDC3. Despite high similarities structurally and functionally, both are localized to opposite surfaces of renal tubular cells. The molecular mechanisms and localization signals leading to this polarized distribution remain unknown. In this study, distribution of NaDC3 in human kidney tissue was firstly observed by immunohistochemistry and immunofluorescence. Then, EGFP-fused wild-type, NH2- and COOH-terminal deletion and point mutants of NaDC3, and chimera between NaDC3 and NaDC1, were generated and transfected into polarized renal cells lines, LLC-PK1 and MDCK. Their subcellular localizations were analyzed by laser confocal microscopy. Immunolocalization results revealed that NaDC3 was expressed at basolateral membrane of human renal proximal tubular epithelia. Confocal examinations showed that wild-type NaDC3 was targeted to the basolateral membrane of MDCK and LLC-PK1. Deletion mutations indicated that the basolateral targeting signal of NaDC3 located within a short sequence AKKVWSARR of its amino-terminal cytoplasmic domain. Addition of this sequence could redirect apical NaDC1 to the basolateral membrane of LLC-PK1. Point mutagenesis revealed that mutation of either of two hydrophobic amino acids V and W in this short sequence largely redirected NaDC3 to both apical and basolateral surfaces of LLC-PK, indicating that the two hydrophobic amino acids are critical for the basolateral targeting of NaDC3. Our studies provide direct evidence of the localization of NaDC3 at the basolateral membrane of human renal proximal tubule cells and identify a di-hydrophobic amino acid motif VW as basolateral localization signal in the N-terminal cytoplasmic domain of NaDC3." @default.
- W2123452666 created "2016-06-24" @default.
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- W2123452666 date "2005-12-05" @default.
- W2123452666 modified "2023-10-09" @default.
- W2123452666 title "Identification of basolateral membrane targeting signal of human sodium-dependent dicarboxylate transporter 3" @default.
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- W2123452666 doi "https://doi.org/10.1002/jcp.20553" @default.
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