Interaction of epicatechin gallate with phospholipid membranes as revealed by solid-state NMR spectroscopy

Yoshinori Uekusa, Miya Kamihira-Ishijima, Osamu Sugimoto, Takeshi Ishii, Shigenori Kumazawa, Kozo Nakamura, Ken Ichi Tanji, Akira Naito, Tsutomu Nakayama

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38 Citations (Scopus)

Abstract

Epicatechin gallate (ECg), a green tea polyphenol, has various physiological effects. Our previous nuclear Overhauser effect spectroscopy (NOESY) study using solution NMR spectroscopy demonstrated that ECg strongly interacts with the surface of phospholipid bilayers. However, the dynamic behavior of ECg in the phospholipid bilayers has not been clarified, especially the dynamics and molecular arrangement of the galloyl moiety, which supposedly has an important interactive role. In this study, we synthesized [ 13C]-ECg, in which the carbonyl carbon of the galloyl moiety was labeled by 13C isotope, and analyzed it by solid-state NMR spectroscopy. Solid-state 31P NMR analysis indicated that ECg changes the gel-to-liquid-crystalline phase transition temperature of DMPC bilayers as well as the dynamics and mobility of the phospholipids. In the solid-state 13C NMR analysis under static conditions, the carbonyl carbon signal of the [13C]-ECg exhibited an axially symmetric powder pattern. This indicates that the ECg molecules rotate about an axis tilting at a constant angle to the bilayer normal. The accurate intermolecular-interatomic distance between the labeled carbonyl carbon of [13C]-ECg and the phosphorus of the phospholipid was determined to be 5.3 ± 0.1 Å by 13C-31P rotational echo double resonance (REDOR) measurements. These results suggest that the galloyl moiety contributes to increasing the hydrophobicity of catechin molecules, and consequently to high affinity of galloyl-type catechins for phospholipid membranes, as well as to stabilization of catechin molecules in the phospholipid membranes by cation-π interaction between the galloyl ring and quaternary amine of the phospholipid head-group.

Original languageEnglish
Pages (from-to)1654-1660
Number of pages7
JournalBiochimica et Biophysica Acta - Biomembranes
Volume1808
Issue number6
DOIs
Publication statusPublished - 2011 Jun 1
Externally publishedYes

Keywords

  • Cationπ interaction
  • ECg
  • Interaction
  • Phospholipid membranes
  • REDOR
  • Solid-state NMR

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Cell Biology

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  • Cite this

    Uekusa, Y., Kamihira-Ishijima, M., Sugimoto, O., Ishii, T., Kumazawa, S., Nakamura, K., Tanji, K. I., Naito, A., & Nakayama, T. (2011). Interaction of epicatechin gallate with phospholipid membranes as revealed by solid-state NMR spectroscopy. Biochimica et Biophysica Acta - Biomembranes, 1808(6), 1654-1660. https://doi.org/10.1016/j.bbamem.2011.02.014