Depolarization of the plasma membrane during neurotransmitter release or muscle excitation/contraction involves increases in intracellular
Ca2+. Homeostasis is reestablished through the action of various enzymes, including ion pumps. PMCAs (Plasma Membrane Calcium
ATPases) belong to the P-type family of transport ATPases which couple ATP hydrolysis to the export of intracellular Ca2+. They are
characterized by large molecular mass, high affinity for Ca2+, and direct regulation by interaction with Ca2+/calmodulin. Four different genes
(PMCA 1-4) and independent alternative splice sites combine to generate multiple PMCA isoforms. PMCA 1-4 are highly homologous, but
differ substantially in their N-terminal regions. PMCA1 and 4 are ubiquitously expressed and perform housekeeping roles. However, PMCA2
and 3 exhibit tissue-specific expression and perform more specialized functions. Although PMCA2 and 3 are both expressed to some degree in
muscle, PMCA2 is primarily found in the cerebellum. There, it accounts for the majority of neural pump protein. Thus, PMCA2 is thought to
be the principal ATPase that functions to maintain Ca2+ homeostasis in response to neural excitation.
原厂资料：
注意事项：
1.Since applications vary, each investigator should titrate the reagent to obtain optimal results.
2.Caution: Sodium azide yields highly toxic hydrazoic acid under acidic conditions. Dilute azide compounds in running water before discarding to avoid accumulation of potentially explosive deposits in plumbing.
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