The formation of an inverted hexagonal phase from thylakoid membranes upon heating

Zoltán Kóta, Balázs Szalontai, Magdolna Droppa, Gábor Horváth, Tibor Páli

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Abstract

Barley thylakoid membranes were studied with FTIR and EPR spectroscopy. Thylakoids were exposed to elevated temperatures in order to induce structural changes. As temperatures increased through physiological to even higher levels, no features changed, but upon heating to above 45°C, the fraction of lipid acyl chain segments with gauche-type vibration increased, accompanied by a sharp drop in the membranous spin probe component. These apparently conflicting observations in fact concur with the formation of an inverted hexagonal (HII) phase, supporting its putative role in protecting the photosynthetic machinery in thylakoid membranes against thermally-induced disassembly.

Original languageEnglish
Pages (from-to)126-128
Number of pages3
JournalCellular and Molecular Biology Letters
Volume7
Issue number1
Publication statusPublished - Jan 1 2002

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Keywords

  • EPR (ESR)
  • FTIR
  • Non-bilayer lipid
  • Photosynthesis
  • Thylakoid

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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