Interactions between lipids and proteins are critical for organization of plasma membrane-ordered domains in tobacco BY-2 cells

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TitreInteractions between lipids and proteins are critical for organization of plasma membrane-ordered domains in tobacco BY-2 cells
Type de publicationJournal Article
Year of Publication2018
AuteursGrosjean K, Der C, Robert F, Thomas D, Mongrand S, Simon-Plas F, Gerbeau-Pissot P
JournalJOURNAL OF EXPERIMENTAL BOTANY
Volume69
Pagination3545-3557
Date PublishedJUL 10
Type of ArticleArticle
ISSN0022-0957
Mots-clésCell wall, cytoskeleton, di-4-ANEPPDHQ, Lipid raft, membrane organization, ordered domains, protein-lipid interactions
Résumé

The laterally heterogeneous plant plasma membrane (PM) is organized into finely controlled specialized areas that include membrane-ordered domains. Recently, the spatial distribution of such domains within the PM has been identified as playing a key role in cell responses to environmental challenges. To examine membrane order at a local level, BY-2 tobacco suspension cell PMs were labelled with an environment-sensitive probe (di-4-ANEPPDHQ). Four experimental models were compared to identify mechanisms and cell components involved in short-term (1 h) maintenance of the ordered domain organization in steady-state cell PMs: modulation of the cytoskeleton or the cell wall integrity of tobacco BY-2 cells; and formation of giant vesicles using either a lipid mixture of tobacco BY-2 cell PMs or the original lipid and protein combinations of the tobacco BY-2 cell PM. Whilst inhibiting phosphorylation or disrupting either the cytoskeleton or the cell wall had no observable effects, we found that lipids and proteins significantly modified both the abundance and spatial distribution of ordered domains. This indicates the involvement of intrinsic membrane components in the local physical state of the plant PM. Our findings support a major role for the `lipid raft' model, defined as the sterol-dependent ordered assemblies of specific lipids and proteins in plant PM organization.

DOI10.1093/jxb/ery152