This magnesium-dependent enzyme catalyzes the hydrolysis of ATP coupled with the translocation of calcium from the cytosol to the sarcoplasmic reticulum lumen. Contributes to calcium sequestration involved in muscular excitation/contraction. Associated with sarcolipin (SLN) and phospholamban (PLN). Increased contractile activity leads to a decrease in SERCA1 expression, while decreased contractile activity leads to an increase in SERCA1 expression. Skeletal muscle, fast twitch muscle (type II) fibers. Reversibly inhibited by phospholamban (PLN) at low calcium concentrations. Dephosphorylated PLN decreases the apparent affinity of the ATPase for calcium. This inhibition is regulated by the phosphorylation of PLN. Belongs to the cation transport ATPase (P-type) (TC 3.A.3) family. Type IIA subfamily. 2 isoforms of the human protein are produced by alternative splicing. Note: This description may include information from UniProtKB.
Protein type: EC 126.96.36.199; Endoplasmic reticulum; Hydrolase; Membrane protein, integral; Membrane protein, multi-pass; Transporter; Transporter, ion channel
Molecular Function: calcium ion binding; calcium-transporting ATPase activity; protein binding; protein homodimerization activity
Biological Process: apoptotic mitochondrial changes; calcium ion transport; elevation of endoplasmic reticulum calcium ion concentration; elevation of mitochondrial calcium ion concentration; maintenance of mitochondrion localization; positive regulation of fast-twitch skeletal muscle contraction; reduction of endoplasmic reticulum calcium ion concentration