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ATPases , -ATPase, HCO3-ATPase, adenosine triphosphatase] are a class of enzymes that catalyze the decomposition of ATP into ADP and a free phosphate ion or the inverse reaction. This dephosphorylation reaction releases energy, which the enzyme harnesses to drive other chemical reactions that would not otherwise occur. This process is widely used in all known forms of life.
Some such enzymes are integral membrane proteins , and move solutes across the membrane, typically against their concentration gradient. These are called transmembrane ATPases.
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