Lumenal gating mechanism revealed in calcium pump crystal structures with phosphate analoguesToyoshima, C., Nomura, H., Tsuda, T.
(2004) Nature 432: 361-368
- PubMed: 15448704
- DOI: 10.1038/nature02981
- Primary Citation of Related Structures:
- Also Cited By: 2ZBG, 2ZBF, 2ZBE, 2EAU, 2EAT, 2EAS, 2EAR, 2DQS
- PubMed Abstract:
- Crystal structure of the calcium pump with a bound ATP analogue
Toyoshima, C.,Mizutani, T.
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Takahashi, M.,Kondou, Y.,Toyoshima, C.
(2007) Proc.Natl.Acad.Sci.Usa 104: 5800
- Structural role of countertransport revealed in Ca(2+) pump crystal structure in the absence of Ca(2+)
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- Structural changes in the calcium pump accompanying the dissociation of calcium
Toyoshima, C.,Nomura, H.
(2002) Nature 418: 605
P-type ion transporting ATPases are ATP-powered ion pumps that establish ion concentration gradients across biological membranes. Transfer of bound cations to the lumenal or extracellular side occurs while the ATPase is phosphorylated. Here we report ...
P-type ion transporting ATPases are ATP-powered ion pumps that establish ion concentration gradients across biological membranes. Transfer of bound cations to the lumenal or extracellular side occurs while the ATPase is phosphorylated. Here we report at 2.3 A resolution the structure of the calcium-ATPase of skeletal muscle sarcoplasmic reticulum, a representative P-type ATPase that is crystallized in the absence of Ca2+ but in the presence of magnesium fluoride, a stable phosphate analogue. This and other crystal structures determined previously provide atomic models for all four principal states in the reaction cycle. These structures show that the three cytoplasmic domains rearrange to move six out of ten transmembrane helices, thereby changing the affinity of the Ca2+-binding sites and the gating of the ion pathway. Release of ADP triggers the opening of the lumenal gate and release of phosphate its closure, effected mainly through movement of the A-domain, the actuator of transmembrane gates.
Institute of Molecular and Cellular Biosciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-0032, Japan. email@example.com