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Fig. 3. Analysis of GFP-Kv2.1-loopBAD
C mobility on the cell surface. HEK cells expressing a GFP-Kv2.1-loopBAD channel without the C-terminal 318 amino acids (
C) were enzymatically biotinylated and tagged with streptavidin-labeled 655 quantum dots as described in the Materials and Methods. (A) Non-clustered cell surface distribution of this mutant channel in three dimensions. (B) The Qdot single-particle track used to generate the MSD plot indicated in C. In this case a diffusion coefficient of 0.10 µm2/second was calculated from the initial slope. Overall the mean diffusion coefficient equalled 0.07±0.04 µm2/second, n=10, for these mutant channels incapable of forming surface clusters. Cells were imaged every 0.55 seconds.