Plastoglobular protein 18 is involved in chloroplast function and thylakoid formation.
Synechocystis
Arabidopsis
chloroplast
plastoglobules
thylakoid membrane
Journal
Journal of experimental botany
ISSN: 1460-2431
Titre abrégé: J Exp Bot
Pays: England
ID NLM: 9882906
Informations de publication
Date de publication:
07 08 2019
07 08 2019
Historique:
received:
02
01
2019
accepted:
02
04
2019
pubmed:
13
4
2019
medline:
21
7
2020
entrez:
13
4
2019
Statut:
ppublish
Résumé
Plastoglobules are lipoprotein particles that are found in different types of plastids. They contain a very specific and specialized set of lipids and proteins. Plastoglobules are highly dynamic in size and shape, and are therefore thought to participate in adaptation processes during either abiotic or biotic stresses or transitions between developmental stages. They are suggested to function in thylakoid biogenesis, isoprenoid metabolism, and chlorophyll degradation. While several plastoglobular proteins contain identifiable domains, others provide no structural clues to their function. In this study, we investigate the role of plastoglobular protein 18 (PG18), which is conserved from cyanobacteria to higher plants. Analysis of a PG18 loss-of-function mutant in Arabidopsis thaliana demonstrated that PG18 plays an important role in thylakoid formation; the loss of PG18 results in impaired accumulation, assembly, and function of thylakoid membrane complexes. Interestingly, the mutant accumulated less chlorophyll and carotenoids, whereas xanthophyll cycle pigments were increased. Accumulation of photosynthetic complexes is similarly affected in both a Synechocystis and an Arabidopsis PG18 mutant. However, the ultrastructure of cyanobacterial thylakoids is not compromised by the lack of PG18, probably due to its less complex architecture.
Identifiants
pubmed: 30976809
pii: 5447334
doi: 10.1093/jxb/erz177
pmc: PMC6685665
doi:
Substances chimiques
Arabidopsis Proteins
0
Chlorophyll
1406-65-1
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
3981-3993Informations de copyright
© The Author(s) 2019. Published by Oxford University Press on behalf of the Society for Experimental Biology.
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