Plastoglobular protein 18 is involved in chloroplast function and thylakoid formation

Author:

Espinoza-Corral Roberto1,Heinz Steffen1,Klingl Andreas1,Jahns Peter2,Lehmann Martin1,Meurer Jörg1,Nickelsen Jörg1,Soll Jürgen13,Schwenkert Serena1ORCID

Affiliation:

1. Department Biologie I, Botanik, Ludwig-Maximilians-Universität, Planegg-Martinsried, Germany

2. Plant Biochemistry, Heinrich-Heine-University Düsseldorf, Düsseldorf, Germany

3. Munich Center for Integrated Protein Science CiPSM, Ludwig-Maximilians-Universität München, Munich, Germany

Abstract

Abstract 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.

Funder

DAAD/BECAS Chile

Deutsche Forschungsgemeinschaft

Publisher

Oxford University Press (OUP)

Subject

Plant Science,Physiology

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