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 Repjournal_title
Scientific reportsauthors
Dlouhý O,Kurasová I,Karlický V,Javornik U,Šket P,Petrova NZ,Krumova SB,Plavec J,Ughy B,Špunda V,Garab Gdoi
10.1038/s41598-020-68854-xsubject
Has Abstractpub_date
2020-07-20 00:00:00pages
11959issue
1issn
2045-2322pii
10.1038/s41598-020-68854-xjournal_volume
10pub_type
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