Lipid polymorphism of plant thylakoid membranes. The dynamic exchange model – facts and hypotheses

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61988987%3A17310%2F25%3AA2603AWC" target="_blank" >RIV/61988987:17310/25:A2603AWC - isvavai.cz</a>

Result on the web

<a href="https://onlinelibrary.wiley.com/doi/10.1111/ppl.70230" target="_blank" >https://onlinelibrary.wiley.com/doi/10.1111/ppl.70230</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1111/ppl.70230" target="_blank" >10.1111/ppl.70230</a>

Result language

angličtina

Original language name

Lipid polymorphism of plant thylakoid membranes. The dynamic exchange model – facts and hypotheses

Original language description

The light reactions of oxygenic photosynthesis are performed by protein complexes embedded in the lipid bilayer of thylakoid membranes (TMs). Bilayers provide optimal conditions for the build‐up of the proton motive force (pmf) and ATP synthesis. However, functional plant TMs, besides the bilayer, contain an inverted hexagonal (H<jats:sub>II</jats:sub>) phase and isotropic phases, a lipid polymorphism due to their major, non‐bilayer lipid species, monogalactosyldiacylglycerol (MGDG). The lipid phase behavior of TMs is explained within the framework of the Dynamic Exchange Model (DEM), an extension of the fluid‐mosaic model. DEM portrays the bilayer phase as inclusions between photosynthetic supercomplexes – characterized by compromised membrane impermeability and restricted sizes inflicted by the segregation propensity of lipid molecules, safe‐guarding the high protein density of TMs. Isotropic phases mediate membrane fusions and are associated with the lumenal lipocalin‐like enzyme, violaxanthin de‐epoxidase. Stromal‐side proteins surrounded by lipids give rise to the H<jats:sub>II</jats:sub> phase. These features instigate experimentally testable hypotheses: (i) non‐bilayer phases mediate functional sub‐compartmentalization of plant chloroplasts – a quasi‐autonomous energization and ATP synthesis of each granum‐stroma TM assembly; and (ii) the generation and utilization of pmf depend on hydrated protein networks and proton‐conducting pathways along membrane surfaces – rather than on strict impermeability of the bilayer.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10610 - Biophysics

Project

<a href="/en/project/GA23-07744S" target="_blank" >GA23-07744S: Identification and characterization of structural entities associated with different lipid phases of plant thylakoid membranes</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

PHYSIOL PLANTARUM

ISSN

0031-9317

e-ISSN

1399-3054

Volume of the periodical

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Issue of the periodical within the volume

2

Country of publishing house

DK - DENMARK

Number of pages

13

Pages from-to

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UT code for WoS article

001469757600001

EID of the result in the Scopus database

2-s2.0-105003121158