3ba6: Difference between revisions
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[[Category: Picard, M]] | [[Category: Picard, M]] | ||
[[Category: Winther, A M.L]] | [[Category: Winther, A M.L]] | ||
[[Category: Alternative splicing]] | |||
[[Category: Aspartyl-phosphoanhydride]] | [[Category: Aspartyl-phosphoanhydride]] | ||
[[Category: Atp-binding]] | [[Category: Atp-binding]] | ||
[[Category: Calcium]] | |||
[[Category: Calcium transport]] | [[Category: Calcium transport]] | ||
[[Category: Endoplasmic reticulum]] | [[Category: Endoplasmic reticulum]] | ||
Revision as of 10:58, 25 October 2017
Structure of the Ca2E1P phosphoenzyme intermediate of the SERCA Ca2+-ATPaseStructure of the Ca2E1P phosphoenzyme intermediate of the SERCA Ca2+-ATPase
Structural highlights
Function[AT2A1_RABIT] This magnesium-dependent enzyme catalyzes the hydrolysis of ATP coupled with the translocation of calcium from the cytosol to the sarcoplasmic reticulum lumen. Contributes to calcium sequestration involved in muscular excitation/contraction (By similarity). Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedThe sarcoplasmic reticulum Ca2+-ATPase, a P-type ATPase, has a critical role in muscle function and metabolism. Here we present functional studies and three new crystal structures of the rabbit skeletal muscle Ca2+-ATPase, representing the phosphoenzyme intermediates associated with Ca2+ binding, Ca2+ translocation and dephosphorylation, that are based on complexes with a functional ATP analogue, beryllium fluoride and aluminium fluoride, respectively. The structures complete the cycle of nucleotide binding and cation transport of Ca2+-ATPase. Phosphorylation of the enzyme triggers the onset of a conformational change that leads to the opening of a luminal exit pathway defined by the transmembrane segments M1 through M6, which represent the canonical membrane domain of P-type pumps. Ca2+ release is promoted by translocation of the M4 helix, exposing Glu 309, Glu 771 and Asn 796 to the lumen. The mechanism explains how P-type ATPases are able to form the steep electrochemical gradients required for key functions in eukaryotic cells. The structural basis of calcium transport by the calcium pump.,Olesen C, Picard M, Winther AM, Gyrup C, Morth JP, Oxvig C, Moller JV, Nissen P Nature. 2007 Dec 13;450(7172):1036-42. PMID:18075584[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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Proteopedia Page Contributors and Editors (what is this?)Proteopedia Page Contributors and Editors (what is this?)
OCA- Calcium-transporting ATPase
- Oryctolagus cuniculus
- Gyrup, C
- Moller, J V
- Morth, J P
- Nissen, P
- Olesen, C
- Oxvig, C
- Picard, M
- Winther, A M.L
- Alternative splicing
- Aspartyl-phosphoanhydride
- Atp-binding
- Calcium
- Calcium transport
- Endoplasmic reticulum
- Hydrolase
- Ion transport
- Magnesium
- Membrane protein
- Metal-binding
- Nucleotide-binding
- P-type atpase
- Phosphoenzyme
- Phosphorylation
- Sarcoplasmic reticulum
- Transmembrane
- Transport