GTP-binding protein RAD (RRAD)

May play a significant role in cardiac antiarrhythmia via the strong reduction of voltage-gated L-type Ca(2+) currents. Regulates voltage-dependent L-type calcium channel subunit alpha- 1C trafficking to the cell membrane (By similarity).

Inhibits cardiac hypertrophy during the calmodulin-dependent kinase II (CaMKII) pathway. Inhibits phosphorylation and activation of CAMK2D.