Calcium-binding protein that modulates excitation-contraction coupling in the heart. Contributes to calcium homeostasis in the heart sarcoplasmic reticulum. Modulates the activity of RYR2 calcium channels (By similarity).
Subcellular locations: Cytoplasm, Sarcoplasmic reticulum membrane
Relocates to the sarcoplasmic reticulum membrane in response to elevated calcium levels.