ATP2A2 Antibody - #DF6240

This magnesium-dependent enzyme catalyzes the hydrolysis of ATP coupled with the translocation of calcium from the cytosol to the sarcoplasmic reticulum lumen. Isoform 2 is involved in the regulation of the contraction/relaxation cycle. Acts as a regulator of TNFSF11-mediated Ca(2+) signaling pathways via its interaction with TMEM64 which is critical for the TNFSF11-induced CREB1 activation and mitochondrial ROS generation necessary for proper osteoclast generation. Association between TMEM64 and SERCA2 in the ER leads to cytosolic Ca (2+) spiking for activation of NFATC1 and production of mitochondrial ROS, thereby triggering Ca (2+) signaling cascades that promote osteoclast differentiation and activation (By similarity).

Nitrated under oxidative stress. Nitration on the two tyrosine residues inhibits catalytic activity.

Endoplasmic reticulum membrane>Multi-pass membrane protein. Sarcoplasmic reticulum membrane>Multi-pass membrane protein.

Isoform 1 is widely expressed in smooth muscle and nonmuscle tissues such as in adult skin epidermis, with highest expression in liver, pancreas and lung, and intermediate expression in brain, kidney and placenta. Also expressed at lower levels in heart and skeletal muscle. Isoforms 2 and 3 are highly expressed in the heart and slow twitch skeletal muscle. Expression of isoform 3 is predominantly restricted to cardiomyocytes and in close proximity to the sarcolemma. Both isoforms are mildly expressed in lung, kidney, liver, pancreas and placenta. Expression of isoform 3 is amplified during monocytic differentiation and also observed in the fetal heart.

Interacts with sarcolipin (SLN) (By similarity). Interacts with phospholamban (PLN) (By similarity). Interacts with myoregulin (MRLN) (By similarity). Interacts with DWORF (By similarity). Isoform 1 interacts with TRAM2 (via C-terminus). Interacts with HAX1. Interacts with S100A8 and S100A9 (By similarity). Interacts with SLC35G1 and STIM1. Interacts with TMEM203. Interacts with TMEM64 and PDIA3 (By similarity).

Ca(2+) and ATP binding cause major rearrangements of the cytoplasmic and transmembrane domains. According to the E1-E2 model, Ca(2+) binding to the cytosolic domain of the pump in the high-affinity E1 conformation is followed by the ATP-dependent phosphorylation of the active site Asp, giving rise to E1P. A conformational change of the phosphoenzyme gives rise to the low-affinity E2P state that exposes the Ca(2+) ions to the lumenal side and promotes Ca(2+) release. Dephosphorylation of the active site Asp mediates the subsequent return to the E1 conformation.

PLN and SLN both have a single transmembrane helix; both occupy a similar binding site that is situated between the ATP2A2 transmembrane helices.

Belongs to the cation transport ATPase (P-type) (TC 3.A.3) family. Type IIA subfamily.