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Berg JM, Tymoczko JL, Stryer L. Biochemistry. 5th edition. New York: W H Freeman; 2002.

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Cover of Biochemistry

Biochemistry. 5th edition.

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Figure 13.5. Mechanism of P-Type ATPase Action.

Figure 13.5Mechanism of P-Type ATPase Action

The binding of Ca2+ and the phosphorylation of the ATPase (steps 1 and 2), illustrated here for the Ca2+ ATPase, lead to the eversion of the binding sites (step 3) and the release of Ca2+ to the luminal side of the membrane (step 4). Hydrolysis of phosphoaspartate (step 5) and eversion (step 6) reset the enzyme to its initial state.

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