title: Dynamic behavior of tea catechins interacting with lipid membranes as determined by NMR spectroscopy.
abstract: Interaction between tea catechins, such as epicatechin gallate (ECg) and epigallocatechin gallate (EGCg), and isotropic bicelle model lipid membranes was investigated by solution NMR techniques. (1)H NMR measurements provided signals from the B-ring and the galloyl moiety in ECg and EGCg that were obviously shifted, and whose proton T1 relaxation times were shortened upon interaction of the catechins with the bicelles. These results indicate that the B-ring and the galloyl moiety play an important role in this interaction. Nuclear Overhauser effect spectrometry experiments demonstrated that the B-ring and the galloyl moiety are located near the gamma-H in the phospholipid trimethylammonium group. On the basis of these findings, we propose that ECg and EGCg interact with the surface of lipid membranes via the choline moiety.
authors.affiliation: Laboratory of Functional Food Science and Global COE Program, School of Food and Nutritional Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan.
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Uekusa
authors.forename: Miya
authors.initials: M
authors.lastname: Kamihira
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Nakayama
mesh_terms: D002392:Catechin / Q000031:analogs & derivatives / Q000032:analysis / Q000737:chemistry*; D008051:Lipid Bilayers / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D013329:Structure-Activity Relationship; D013662:Tea / Q000737:chemistry*
chemical_list: D008051:Lipid Bilayers; D013662:Tea; D002392:Catechin; C062669:epicatechin gallate; C045651:epigallocatechin gallate