Structural changes in the calcium pump accompanying the dissociation of calciumToyoshima, C., Nomura, H.
(2002) Nature 418: 605-611
- PubMed: 12167852
- DOI: 10.1038/nature00944
- Also Cited By: 2ZBG, 2ZBF, 2ZBE, 2ZBD, 2Z9R, 2EAU, 2EAT, 2EAS, 2EAR, 2DQS
- PubMed Abstract:
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Kutschabsky, L.,Kretschmer, R.-G.,Ripperger, H.
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- Crystal structure of the calcium pump of sarcoplasmic reticulum at 2.6 A resolution
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Christensen, S.B.,Andersen, A.,Smitt, U.W.
(1997) Fortschr.Chem.Org.Naturst. 71: 129
In skeletal muscle, calcium ions are transported (pumped) against a concentration gradient from the cytoplasm into the sarcoplasmic reticulum, an intracellular organelle. This causes muscle cells to relax after cytosolic calcium increases during exci ...
In skeletal muscle, calcium ions are transported (pumped) against a concentration gradient from the cytoplasm into the sarcoplasmic reticulum, an intracellular organelle. This causes muscle cells to relax after cytosolic calcium increases during excitation. The Ca(2+) ATPase that carries out this pumping is a representative P-type ion-transporting ATPase. Here we describe the structure of this ion pump at 3.1 A resolution in a Ca(2+)-free (E2) state, and compare it with that determined previously for the Ca(2+)-bound (E1Ca(2+)) state. The structure of the enzyme stabilized by thapsigargin, a potent inhibitor, shows large conformation differences from that in E1Ca(2+). Three cytoplasmic domains gather to form a single headpiece, and six of the ten transmembrane helices exhibit large-scale rearrangements. These rearrangements ensure the release of calcium ions into the lumen of sarcoplasmic reticulum and, on the cytoplasmic side, create a pathway for entry of new calcium ions.
Institute of Molecular and Cellular Biosciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-0032, Japan. email@example.com