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Structure-function relationships of E1-E2 transitions and cation binding in Na,K-pump protein

P L Jorgensen1, J M Nielsen, J H Rasmussen

  • 1Biomembrane Research Center, August Krogh Institute, University of Copenhagen, Denmark. PLJorgense@AKI.KU.DK

Biochimica Et Biophysica Acta
|August 7, 1998
PubMed
Summary

Researchers identified key residues in the sodium-potassium pump (Na,K-ATPase) that control ion binding and conformational changes. These findings reveal a molecular switch mechanism essential for enzyme function and ion transport.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Membrane Protein Research

Background:

  • The Na,K-ATPase is a crucial transmembrane protein responsible for maintaining electrochemical gradients in animal cells.
  • Understanding the molecular mechanisms of ion transport and conformational changes in Na,K-ATPase is vital for cellular physiology.

Purpose of the Study:

  • To investigate the roles of specific amino acid residues in the function of Na,K-ATPase.
  • To elucidate the molecular basis of ion binding and conformational transitions (E1-E2) in Na,K-ATPase.

Main Methods:

  • Expression of fully active Na,K-ATPase and mutant variants in yeast cells.
  • Characterization of ATP binding, ion occlusion, and phosphorylation.
  • Determination of affinity constants and conformational equilibrium constants.

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Main Results:

  • A mutation at Asp369Ala revealed higher intrinsic ATP binding affinity and shifted equilibrium towards the E2 form.
  • Substitutions in transmembrane segments 4, 5, and 6 (Glu327, Glu779, Asp804, Asp808) impaired K+ occlusion and Na+ binding.
  • Asn776 is crucial for both K+ and Na+ binding, while Thr774 and Ser775 act as specific determinants for Na+ and K+ binding, respectively, forming a molecular switch.

Conclusions:

  • Specific residues, including Thr774 and Ser775, form a molecular switch controlling Na+ and K+ binding.
  • Helix rotation or tilting during the E1-E2 transition likely regulates the position of this switch.
  • These findings provide insights into the intricate mechanism of ion transport by Na,K-ATPase.