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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 13.4. Structure of SR CA2+ ATPase.

Figure 13.4Structure of SR CA2+ ATPase

Figure 13.4. Structure of SR CA2+ ATPase. This enzyme, the calcium pump of the sarcoplasmic reticulum, comprises a membrane-spanning domain of 10 α helices and a cytoplasmic headpiece consisting of three domains (N, P, and A). Two calcium ions (green) bind within the membrane-spanning region. The aspartate residue characteristic of this protein family is indicated.

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