Cu2+ Binds to Phosphatidylethanolamine and Increases Oxidation in Lipid Membranes

Matthew F. Poyton, Anne M. Sendecki, Xiao Cong, Paul S. Cremer

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Herein, we demonstrate that Cu2+ binds bivalently to phosphatidylethanolamine (PE), the second most abundant lipid in mammalian cells. The apparent equilibrium dissociation constant, KDApp, for the Cu2+-PE complex at physiological pH is approximately 2 μM and is insensitive to the concentration of PE in the membrane. By contrast, at pH 10.0, where PE lipids bear a negative charge, KDApp decreases with increasing PE content and has a value of 150 nM for bilayers containing 70 mol % PE. The oxidation of double bonds in PE-containing bilayers can be monitored in the presence of Cu2+. Strikingly, it was found that the oxidation rate is 8.2 times faster at pH 7.4 for bilayers containing 70 mol % PE than for pure phosphatidylcholine (PC) bilayers upon exposure of both to 70 μM Cu2+ and 10 mM hydrogen peroxide. The rate of oxidation increases linearly with the PE content in the membrane. These results may help explain the high level of lipid oxidation in PE-containing membranes for neurodegenerative diseases and autism where the Cu2+ concentration in the body is abnormally high.

Original languageEnglish (US)
Pages (from-to)1584-1590
Number of pages7
JournalJournal of the American Chemical Society
Volume138
Issue number5
DOIs
StatePublished - Feb 17 2016

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Membrane Lipids
Lipids
Oxidation
Membranes
Neurodegenerative diseases
Hydrogen peroxide
Cells
phosphatidylethanolamine
Dissociative Disorders
Autistic Disorder
Phosphatidylcholines
Neurodegenerative Diseases
Hydrogen Peroxide

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

Poyton, Matthew F. ; Sendecki, Anne M. ; Cong, Xiao ; Cremer, Paul S. / Cu2+ Binds to Phosphatidylethanolamine and Increases Oxidation in Lipid Membranes. In: Journal of the American Chemical Society. 2016 ; Vol. 138, No. 5. pp. 1584-1590.
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Cu2+ Binds to Phosphatidylethanolamine and Increases Oxidation in Lipid Membranes. / Poyton, Matthew F.; Sendecki, Anne M.; Cong, Xiao; Cremer, Paul S.

In: Journal of the American Chemical Society, Vol. 138, No. 5, 17.02.2016, p. 1584-1590.

Research output: Contribution to journalArticle

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