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. 2019 Aug 13;9:11791. doi: 10.1038/s41598-019-48071-x

Figure 7.

Figure 7

Total and membrane expression of wt NALCN channel and its L509S and Y578S variants. (A) Representative cell surface biotinylation experiment. The cell surface biotinylation assay was performed in cells transfected with NLF1 alone (Mock) or along with wt NALCN, NALCN-L509S or NALCN-Y578S (GFP tagged). The Na+/K+ ATPase, a plasma membrane protein, and the calreticulin, a reticulum-resident protein, were used internal controls. (B) The expression levels of wt NALCN, NALCN-L509S and NALCN-Y578S were normalized with the Na+/K+ ATPase level from both total and membrane fractions. The total expression compared to NALCN was: L509S, 62.99 ± 8.725%, p < 0.01; Y578S, 56.24 ± 9.408%, p < 0.01, while the membrane expression compared to NALCN was: L509S, 63.94 ± 7.261%, p < 0.01; Y578S, 46.69 ± 7.412%, p < 0.001 (n = 6 independent experiments). Statistical significance was calculated with a one-way ANOVA multiple comparisons test.