Modulation of non-bilayer lipid phases and the structure and functions of thylakoid membranes: effects on the water-soluble enzyme violaxanthin de-epoxidase.

Abstract:

:The role of non-bilayer lipids and non-lamellar lipid phases in biological membranes is an enigmatic problem of membrane biology. Non-bilayer lipids are present in large amounts in all membranes; in energy-converting membranes they constitute about half of their total lipid content-yet their functional state is a bilayer. In vitro experiments revealed that the functioning of the water-soluble violaxanthin de-epoxidase (VDE) enzyme of plant thylakoids requires the presence of a non-bilayer lipid phase. 31P-NMR spectroscopy has provided evidence on lipid polymorphism in functional thylakoid membranes. Here we reveal reversible pH- and temperature-dependent changes of the lipid-phase behaviour, particularly the flexibility of isotropic non-lamellar phases, of isolated spinach thylakoids. These reorganizations are accompanied by changes in the permeability and thermodynamic parameters of the membranes and appear to control the activity of VDE and the photoprotective mechanism of non-photochemical quenching of chlorophyll-a fluorescence. The data demonstrate, for the first time in native membranes, the modulation of the activity of a water-soluble enzyme by a non-bilayer lipid phase.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Dlouhý O,Kurasová I,Karlický V,Javornik U,Šket P,Petrova NZ,Krumova SB,Plavec J,Ughy B,Špunda V,Garab G

doi

10.1038/s41598-020-68854-x

subject

Has Abstract

pub_date

2020-07-20 00:00:00

pages

11959

issue

1

issn

2045-2322

pii

10.1038/s41598-020-68854-x

journal_volume

10

pub_type

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