Crystal structure of the calcium pump with a bound ATP analogue.Toyoshima, C., Mizutani, T.
(2004) Nature 430: 529-535
- PubMed: 15229613
- DOI: 10.1038/nature02680
- Also Cited By: 2ZBG, 2ZBF, 2ZBE, 2ZBD, 2Z9R, 2EAU, 2EAT, 2EAS, 2EAR, 2DQS, 2AGV, 1WPG, 1WPE
- PubMed Abstract:
- Crystal structure of the calcium pump of sarcoplasmic reticulum at 2.6 A resolution.
Toyoshima, C.,Nakasako, M.,Nomura, H.,Ogawa, H.
(2000) Nature 405: 647
- Structural changes in the calcium pump accompanying the dissociation of calcium.
Toyoshima, C.,Nomura, H.
(2002) Nature 418: 605
- Structural basis of ion pumping by Ca(2+)-ATPase of sarcoplasmic reticulum.
Toyoshima, C.,Nomura, H.,Sugita, Y.
(2003) FEBS Lett. 555: 106
P-type ATPases are ATP-powered ion pumps that establish ion concentration gradients across cell and organelle membranes. Here, we describe the crystal structure of the Ca2+ pump of skeletal muscle sarcoplasmic reticulum, a representative member of th ...
P-type ATPases are ATP-powered ion pumps that establish ion concentration gradients across cell and organelle membranes. Here, we describe the crystal structure of the Ca2+ pump of skeletal muscle sarcoplasmic reticulum, a representative member of the P-type ATPase superfamily, with an ATP analogue, a Mg2+ and two Ca2+ ions in the respective binding sites. In this state, the ATP analogue reorganizes the three cytoplasmic domains (A, N and P), which are widely separated without nucleotide, by directly bridging the N and P domains. The structure of the P-domain itself is altered by the binding of the ATP analogue and Mg2+. As a result, the A-domain is tilted so that one of the transmembrane helices moves to lock the cytoplasmic gate of the transmembrane Ca2+-binding sites. This appears to be the mechanism for occluding the bound Ca2+ ions, before releasing them into the lumen of the sarcoplasmic reticulum.
Institute of Molecular and Cellular Biosciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-0032, Japan. email@example.com