- Peptide (C)SGVKNSLKEANHD, corresponding to amino acid residues 12-24 of human PMCA1 (Accession P20020). Intracellular, N-terminus.
- Western blot analysis of rat (lanes 1 and 3) and mouse (lanes 2 and 4) brain lysates:1,2. Anti-PMCA1 Antibody (#ACP-005), (1:200).
3,4. Anti-PMCA1 Antibody, preincubated with PMCA1 Blocking Peptide (#BLP-CP005).
- Expression of PMCA1 in mouse hippocampusImmunohistochemical staining of perfusion-fixed frozen rat brain sections using Anti-PMCA1 Antibody (#ACP-005), (1:300), followed by goat anti-rabbit-AlexaFluor-488 antibody. PMCA1 staining (green) appears in the stratum radiatum (SR) and oriens (OR) layers but not in the pyramidal (Pyr) layer of hippocampal CA1 region (arrows). Nuclei are labeled with DAPI (blue).
The plasma membrane calcium ATPase (PMCA) is a transport protein in the plasma membrane of cells responsible for removing calcium (Ca2+) from the cell. This pump is vital for regulating the amount of Ca2+ within cells1.
PMCA and the sodium/calcium exchanger (NCX) are together the main regulators of intracellular Ca2+ concentrations2.
Since it transports Ca2+ into the extracellular space, PMCA is also an important regulator of the Ca2+ concentration in the extracellular space3.
The PMCA belongs to a family of P-type primary ion transport ATPases, and is expressed in a variety of tissues, including the brain4.
The pump is powered by the hydrolysis of adenosine triphosphate (ATP), with a stoichiometry of one Ca2+ ion removed for each molecule of ATP hydrolyzed. It binds to Ca2+ ions with a high affinity (a Km of 100 to 200 nM) but does not remove Ca2+ at a very fast rate. This is in contrast to the NCX, which has a low affinity and a high capacity. Thus, the PMCA is effective at binding Ca2+ even when its concentration within the cell is very low, and so is suited to maintaining Ca2+ at its normally very low levels. The NCX is better suited to removing large amounts of Ca2+ quickly, as it is needed in neurons after an action potential. Thus the activities of the two types of pump complement each other5.
Species reactivity key:
Alomone Labs is pleased to offer a highly specific antibody directed against an epitope of the human Plasma membrane calcium-transporting ATPase 1. Anti-PMCA1 Antibody (#ACP-005) can be used in western blot and immunohistochemistry applications. It has been designed to recognize PMCA1 from mouse, rat, and human samples.