Human ATP2B1 (PMCA1) knockout HeLa cell lysate

Supplementary info

This supplementary information is collated from multiple sources and compiled automatically.

Activity summary

The plasma membrane calcium ATPase 1 (PMCA1) also known by its gene name ATP2B1 is an essential protein responsible for the regulation of intracellular calcium levels. Mechanically PMCA1 functions as a calcium pump actively transporting calcium ions out of the cell using ATP hydrolysis. This protein has a molecular mass of approximately 135 kDa. PMCA1 is widely expressed in many tissues but shows higher expression in excitable cells such as neurons and muscle cells where rapid calcium signaling is critical.

Biological function summary

PMCA1 plays a fundamental role in maintaining calcium homeostasis which is important for many cellular processes including muscle contraction nerve impulse transmission and cell signaling. It functions independently but in some contexts it may interact with other proteins to modulate its activity. The protein helps prevent toxic accumulation of calcium inside cells therefore protecting cellular integrity and function.

Pathways

PMCA1 is integral to the calcium signaling pathway where it helps regulate cellular responses to fluctuating calcium levels. It interacts with other key proteins such as calmodulin which can enhance its activity in response to increased intracellular calcium. PMCA1 also links to the phosphatidylinositol signaling pathway where its function assists in the propagation of signaling cascades that manage processes like growth and metabolism.

Associated diseases and disorders

PMCA1 has associations with conditions impacting calcium regulation such as hypertension and cardiovascular diseases. Dysfunctional regulation of PMCA1 can lead to abnormal calcium homeostasis contributing to such disorders. Furthermore PMCA1's interaction with proteins like the sodium-calcium exchanger (NCX) suggests a complex regulatory network that when disrupted may trigger or exacerbate disease states.