|
Ca2+ ATPase is a form of P-ATPase that transfers calcium after a muscle has contracted. The calcium ATPase are:〔(nlm.nih.gov )〕 *Plasma membrane Ca2+ ATPase (PMCA) *Sarcoplasmic reticulum Ca2+ ATPase (SERCA) == Plasma membrane Ca2+ ATPase (PMCA) == (詳細はtransport protein in the plasma membrane of cells that serves to remove calcium (Ca2+) from the cell. It is vital for regulating the amount of Ca2+ within cells. In fact, the PMCA is involved in removing Ca2+ from all eukaryotic cells. There is a very large transmembrane electrochemical gradient of Ca2+ driving the entry of the ion into cells, yet it is very important for cells to maintain low concentrations of Ca2+ for proper cell signalling; thus it is necessary for the cell to employ ion pumps to remove the Ca2+. The PMCA and the sodium calcium exchanger (NCX) are together the main regulators of intracellular Ca2+ concentrations.〔 Since it transports Ca2+ into the extracellular space, the PMCA is also an important regulator of the calcium concentration in the extracellular space. The PMCA belongs to a family of P-type primary ion transport ATPases that form an aspartyl phosphate intermediate.〔 The PMCA is expressed in a variety of tissues, including the brain.〔 〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Calcium ATPase」の詳細全文を読む スポンサード リンク
|