Chimeric Rem/Gem analyses of determinants required for α1C-binding-dependent CaV1.2 inhibition. (A) FRET detection of interactions between YFP-α1CNT and CFP-tagged Rem/Gem constructs. *P < 0.05 compared with CFP-FRB using one-way ANOVA and Bonferroni tests. Data are means ± SEM. (B) Left, Jpeak─V relationships for α1C + β2a (▪, n = 6) and α1C + β2a + Gem-r (О, n = 4) channels. Data for α1C + β2a + Rem is reproduced for comparison (red line). Right, Jpeak─V relationships for α1C + β2aTM (▪, n = 9) and α1C + β2aTM + Gem-r (О, n = 8) channels. Data for α1C + β2aTM + Rem is reproduced for comparison (red line). (C) Left, Jpeak─V relationships for α1C + β2a (▪, n = 6) (data are same as in (B)) and α1C + β2a + r-Gem-r (▿, n = 7) channels. Data for α1C + β2a + Rem is reproduced for comparison (red line). Right, Jpeak─V relationships for α1C + β2aTM (▪, n = 9) and α1C + β2aTM + r-Gem-r (▿, n = 10) channels. Data for α1C + β2aTM + Rem is reproduced for comparison (red line). (D) Left, Jpeak─V relationships for α1C + β2a (▪, n = 6) (data are same as in (B)) and α1C + β2a + g-Rem (◊, n = 9) channels. Data for α1C + β2a + Rem is reproduced for comparison (red line). Right, Jpeak─V relationships for α1C + β2aTM (▪, n = 9) (data are same as in (C)) and α1C + β2aTM + g-Rem (◊, n = 8) channels. Data for α1C + β2aTM + Rem is reproduced for comparison (red line). Data are means ± SEM.