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4-hydroxynonenal inhibits Na(+)-K(+)-ATPase

W G Siems1, S J Hapner, F J van Kuijk

  • 1Department of Chemistry and Biochemistry, Montana State University, Bozeman 59717, USA.

Free Radical Biology & Medicine
|January 1, 1996
PubMed
Summary
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4-Hydroxynonenal (HNE) irreversibly inhibits Na(+)-K(+)-ATPase by binding to sulfhydryl groups, leading to significant enzyme activity loss. Recovery is limited, suggesting HNE adducts form at inaccessible sites or with other amino acids.

Area of Science:

  • Biochemistry
  • Enzymology
  • Cellular Biology

Background:

  • Na(+)-K(+)-ATPase is a crucial ion pump involved in maintaining cellular homeostasis.
  • Oxidative stress generates reactive aldehydes like 4-hydroxynonenal (HNE).
  • HNE is known to modify proteins, potentially affecting enzyme function.

Purpose of the Study:

  • To investigate the interaction between 4-hydroxynonenal (HNE) and Na(+)-K(+)-ATPase.
  • To determine the impact of HNE binding on enzyme activity and structure.
  • To explore the reversibility of HNE-induced inhibition.

Main Methods:

  • Enzyme inhibition assays measuring Na(+)-K(+)-ATPase activity.
  • Quantification of sulfhydryl groups.
  • Treatment with reducing agents (beta-mercaptoethanol, hydroxylamine) to assess reversibility.

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Main Results:

  • 4-Hydroxynonenal (HNE) rapidly binds to Na(+)-K(+)-ATPase, decreasing sulfhydryl groups and enzyme activity (I50 = 120 microM).
  • While beta-mercaptoethanol partially restored activity, a combination with hydroxylamine achieved 85% recovery, indicating significant irreversible inhibition.
  • Evidence suggests HNE adducts form at beta-mercaptoethanol-inaccessible sites and with other amino acids like lysine.

Conclusions:

  • 4-Hydroxynonenal binding causes irreversible inhibition of Na(+)-K(+)-ATPase.
  • HNE modification of critical sulfhydryl groups and potentially lysine residues underlies the functional impairment.
  • These findings highlight HNE as a potent inhibitor of Na(+)-K(+)-ATPase, with implications for cellular function during oxidative stress.