Function
Reversibly inhibits the activity of ATP2A1 in sarcoplasmic reticulum by decreasing the apparent affinity of the ATPase for Ca(2+). Modulates calcium re-uptake during muscle relaxation and plays an important role in calcium homeostasis in muscle (PubMed:21697544, PubMed:26816378). Required for muscle-based, non-shivering thermogenesis (PubMed:22961106).