ATP2A1 also known as SERCA1 is a member of the sarcoplasmic or endoplasmic reticulum calcium ATPase family. ATP2A1 plays a crucial role in muscle physiology by mediating the uptake of calcium ions into the sarcoplasmic reticulum, which is essential for muscle contraction and relaxation. Proper functioning of ATP2A1 is vital for maintaining low cytoplasmic calcium concentrations, thereby preventing excessive muscle contraction and ensuring efficient muscle relaxation. This regulation is particularly important in type II (fast) skeletal muscle, where ATP2A1 is exclusively expressed, allowing for rapid and powerful muscle contractions. ATP2A1′s activity is influenced by various post-translational modifications, which can affect function and stability, highlighting the importance of understanding these modifications in the context of muscle health and disease.