Crystal Structure of Na+, K+-ATPase in the Na+-Bound State
2013 (English)In: Science, ISSN 0036-8075, E-ISSN 1095-9203, Vol. 342, no 6154, 123-127 p.Article in journal (Refereed) Published
The Na+, K+-adenosine triphosphatase (ATPase) maintains the electrochemical gradients of Na+ and K+ across the plasma membrane-a prerequisite for electrical excitability and secondary transport. Hitherto, structural information has been limited to K+-bound or ouabain-blocked forms. We present the crystal structure of a Na+-bound Na+, K+-ATPase as determined at 4.3 angstrom resolution. Compared with the K+-bound form, large conformational changes are observed in the a subunit whereas the beta and gamma subunit structures are maintained. The locations of the three Na+ sites are indicated with the unique site III at the recently suggested IIIb, as further supported by electrophysiological studies on leak currents. Extracellular release of the third Na+ from IIIb through IIIa, followed by exchange of Na+ for K+ at sites I and II, is suggested.
Place, publisher, year, edition, pages
2013. Vol. 342, no 6154, 123-127 p.
IdentifiersURN: urn:nbn:se:kth:diva-133524DOI: 10.1126/science.1243352ISI: 000325126100060ScopusID: 2-s2.0-84885653302OAI: oai:DiVA.org:kth-133524DiVA: diva2:662406
FunderSwedish Research CouncilEU, European Research Council, 209825 250322Science for Life Laboratory - a national resource center for high-throughput molecular bioscienceSwedish e‐Science Research Center
QC 201311072013-11-072013-11-062013-11-07Bibliographically approved