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Sci Rep September 21, 2015; 5 12241.

Effects of Nt-truncation and coexpression of isolated Nt domains on the membrane trafficking of electroneutral Na+/HCO3- cotransporters.

Wang DK , Liu Y , Myers EJ , Guo YM , Xie ZD , Jiang DZ , Li JM , Yang J , Liu M , Parker MD , Chen LM .

The SLC4 genes are all capable of producing multiple variants by alternative splicing or using alternative promoters. The physiological consequences of such diversity are of great interest to investigators. Here, we identified two novel variants of the electroneutral Na(+)/HCO3- cotransporter NBCn1, one full-length starting with "MIPL" and the other Nt-truncated starting with "MDEL". Moreover, we identified a new promoter of Slc4a10 encoding NBCn2 and a novel type of Nt-truncated NBCn2 starting with "MHAN". When heterologously expressed, the new NBCn1 variants were well localized to the plasma membrane and exhibited characteristic NBCn1 activity. However, MHAN-NBCn2 was poorly localized on the plasma membrane. By deletion mutations, we identified the Nt regions important for the surface localization of NBCn2. Interestingly, coexpressing the full-length NBCn2 greatly enhances the surface abundance of the Nt-truncated NBCn2. Co-immunoprecipitation and bimolecular fluorescence complementation studies showed that the full-length and Nt-truncated NBCn2 interact with each other to form heterodimers in neuro-2A cells. Finally, we showed that the isolated Nt domain interacts with and enhances the surface abundance of the Nt-truncated NBCn2. The present study expands our knowledge of the NBCn1 and NBCn2 transcriptome, and provides insights into how the Nt domain could affect transporter function by regulating its membrane trafficking.

PubMed ID: 26192895
PMC ID: PMC4507446
Article link: Sci Rep

Species referenced: Xenopus laevis
Genes referenced: cyp26a1 myc slc4a10 slc4a7 tbl1x tdgf1.2 tdgf1.3 ttn
GO keywords: sodium ion transport [+]

Article Images: [+] show captions
References [+] :
Alper, The SLC26 gene family of anion transporters and channels. 2013, Pubmed