ATP2C2
Function
ATP-driven pump that supplies the Golgi apparatus with Ca(2+) and Mn(2+) ions, both essential cofactors for processing and trafficking of newly synthesized proteins in the secretory pathway (PubMed:15677451, PubMed:15831496, PubMed:16332677, PubMed:30923126). Within a catalytic cycle, acquires Ca(2+) or Mn(2+) ions on the cytoplasmic side of the membrane and delivers them to the lumenal side. The transfer of ions across the membrane is coupled to ATP hydrolysis and is associated with a transient phosphorylation that shifts the pump conformation from inward-facing to outward-facing state (PubMed:15831496, PubMed:16332677). Induces Ca(2+) influx independently of its ATP-driven pump function. At the basolateral membrane of mammary epithelial cells, interacts with Ca(2+) channel ORAI1 and mediates Ca(2+) entry independently of the Ca(2+) content of endoplasmic reticulum or Golgi stores. May facilitate transepithelial transport of large quantities of Ca(2+) for milk secretion via activation of Ca(2+) influx channels at the plasma membrane and active Ca(2+) transport at the Golgi apparatus (PubMed:20887894, PubMed:23840669).
Sequence Similarities
Belongs to the cation transport ATPase (P-type) (TC 3.A.3) family. Type IIA subfamily.
Tissue Specificity
Highly expressed in the gastrointestinal and respiratory tracts, prostate, thyroid, salivary, and mammary glands (PubMed:15831496). Expressed in colon epithelial cells (at protein level). Expressed in brain and testis (at protein level) (PubMed:15677451).
Cellular localization
- Golgi apparatus
- trans-Golgi network membrane
- Multi-pass membrane protein
- Cell membrane
- Multi-pass membrane protein
- Basolateral cell membrane
- Multi-pass membrane protein
Alternative names
KIAA0703, SPCA2, ATP2C2, Calcium-transporting ATPase type 2C member 2, ATPase 2C2, Ca(2+)/Mn(2+)-ATPase 2C2, Secretory pathway Ca(2+)-transporting ATPase type 2