Phosphatidylethanolamine accelerates aggregation of the amyloidogenic N-terminal fragment of apoA-I.

Naoko Kurimitsu, Chiharu Mizuguchi, Kaho Fujita, Suzuno Taguchi, Takashi Ohgita, Kazuchika Nishitsuji, Toshinori Shimanouchi, Hiroyuki Saito

FEBS letters 2020 May

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Membrane lipid composition is known to influence aggregation and fibril formation of many amyloidogenic proteins. Here, we found that phosphatidylethanolamine (PE) accelerates aggregation of the N-terminal 1-83 fragment of an amyloidogenic G26R variant of apoA-I on lipid membranes. Circular dichroism and isothermal titration calorimetry measurements demonstrated that PE does not affect the α-helical structure and lipid binding property of apoA-I 1-83/G26R. Rather, fluorescence measurements indicated that PE induces more ordered lipid packing at the interfacial and acyl chain regions, providing more hydrophobic environments especially around the highly amyloidogenic regions in apoA-I on the membrane surface. These results suggest that PE promotes aggregation of the amyloidogenic N-terminal fragment of apoA-I on lipid membranes by inducing hydrophobic membrane environments. © 2020 Federation of European Biochemical Societies.

Citation

Naoko Kurimitsu, Chiharu Mizuguchi, Kaho Fujita, Suzuno Taguchi, Takashi Ohgita, Kazuchika Nishitsuji, Toshinori Shimanouchi, Hiroyuki Saito. Phosphatidylethanolamine accelerates aggregation of the amyloidogenic N-terminal fragment of apoA-I. FEBS letters. 2020 May;594(9):1443-1452