Journal
ANNUAL REVIEW OF BIOCHEMISTRY
Volume 73, Issue -, Pages 269-292Publisher
ANNUAL REVIEWS
DOI: 10.1146/annurev.biochem.73.011303.073700
Keywords
membrane protein; crystal structure; active transport; Ca2+ binding; P-type ATPase
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Funding
- NATIONAL HEART, LUNG, AND BLOOD INSTITUTE [P01HL027867] Funding Source: NIH RePORTER
- NHLBI NIH HHS [HL27867] Funding Source: Medline
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The structures of the Ca2+-ATPase (SERCA1a) have been determined for five different states by X-ray crystallography. Detailed comparison of the structures in the Ca2+ bound form and unbound (but thapsigargin bound) form reveals that very large rearrangements of the transmembrane helices take place accompanying Ca2+ dissociation and binding and that they are mechanically linked with equally large movements of the cytoplasmic domains. The meanings of the rearrangements of the transmembrane helices and those of the cytoplasmic domains as well as the mechanistic roles of phosphorylation are now becoming clear. Furthermore, the roles of critical amino acid residues identified by extensive mutagenesis studies are becoming evident in terms of atomic structure.
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