Figure 4. STAC1 and STAC2 display different degrees of colocalization with CaV1.1 and CaV1.2 in skeletal myotubes.
(A) Domain structures of STAC1, STAC2, and STAC3. (B) STAC1 fails to show triad targeting in dysgenic myotubes expressing CaV1.1, but co-clusters with the channel in about half of the myotubes expressing CaV1.2 (51.8 ± 4.2%, N = 4, n = 120). Color overlay: 4X of blue rectangle. Scale bars: 10 μm and 5 μm. (C) Only STAC3 co-clusters with CaV1.1, while the three STAC proteins display different degrees of co-clustering with CaV1.2 (mean ± s.e.; N = 4, n = 120).