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Université de Neuchâtel

The Novel Chloroplast Outer Membrane Kinase KOC1 Is a Required Component of the Plastid Protein Import Machinery

Zufferey, Mónica ; Montandon, Cyrille ; Douet, Véronique ; Demarsy, Emilie ; Agne, Birgit ; Baginsky, Sacha ; Kessler, Felix

In: Journal of biological chemistry, 2017, vol. 292, no. 17, p. 6952-6964

The biogenesis and maintenance of cell organelles such as mitochondria and chloroplasts require the import of many proteins from the cytosol, a process that is controlled by phosphorylation. In the case of chloroplasts, the import of hundreds of different proteins depends on translocons at the outer and inner chloroplast membrane (TOC and TIC, respectively) complexes. The essential protein TOC159...

Université de Neuchâtel

Lipid Antioxidant and Galactolipid Remodeling under Temperature Stress in Tomato Plants

Spicher, Livia ; Glauser, Gaétan ; Kessler, Felix

In: Frontiers in Plant Science, 2016, vol. 7, p. Article 167

Increased temperatures are a major scenario in climate change and present a threat to plant growth and agriculture. Plant growth depends on photosynthesis. To function optimally, the photosynthetic machinery at the thylakoid membrane in chloroplasts continuously adapts to changing conditions. Here, we set out to discover the most important changes arising at the lipid level under high...

Université de Neuchâtel

Dual targeting of a mature plastoglobulin/fibrillin fusion protein to chloroplast plastoglobules and thylakoids in transplastomic tobacco plants

Shanmugabalaji, Venkatasalam ; Besagni, Céline ; Piller, Lucia Eugeni ; Douet, Veronique ; Ruf, Stephanie ; Bock, Ralph ; Kessler, Felix

In: Plant Molecular Biology, 2013, vol. 81, no. 1, p. 13-25

Plastoglobules (PG) are lipid droplets in chloroplasts and other plastid types having important functions in lipid metabolism. Plastoglobulins (PGL) also known as fibrillins (FBN) are evolutionary conserved proteins present at the PG surface but also to various extents at the thylakoid membrane. PGLs are thought to have structural functions in PG formation and maintenance. The targeting of an...

Université de Neuchâtel

STAY-GREEN and Chlorophyll Catabolic Enzymes Interact at Light-Harvesting Complex II for Chlorophyll Detoxification during Leaf Senescence in Arabidopsis

Sakuraba, Yasuhito ; Schelbert, Silvia ; Park, So-Yon ; Han, Su-Hyun ; Lee, Byoung-Doo ; Besagni Andrès, Céline ; Kessler, Felix ; Hörtensteiner, Stefan ; Paek, Nam-Chon

In: The Plant Cell, 2012, vol. 24, no. 2, p. 507-518

During leaf senescence, plants degrade chlorophyll to colorless linear tetrapyrroles that are stored in the vacuole of senescing cells. The early steps of chlorophyll breakdown occur in plastids. To date, five chlorophyll catabolic enzymes (CCEs), NONYELLOW COLORING1 (NYC1), NYC1-LIKE, pheophytinase, pheophorbide a oxygenase (PAO), and red chlorophyll catabolite reductase, have been...

Université de Neuchâtel

The role of plastoglobules in thylakoid lipid remodeling during plant development

Rottet, Sarah ; Besagni, Céline ; Kessler, Felix

In: Biochimica et Biophysica Acta (BBA) - Bioenergetics, 2015, vol. 1847, no. 9, p. 889-899

Photosynthesis is the key bioenergetic process taking place in the chloroplast. The components of the photosynthetic machinery are embedded in a highly dynamic matrix, the thylakoid membrane. This membrane has the capacity to adapt during developmental transitions and under stress conditions. The galactolipids are the major polar lipid components of the thylakoid membrane conferring bilayer...

Université de Neuchâtel

Identification of Plastoglobules as a Site of Carotenoid Cleavage

Rottet, Sarah ; Devillers, Julie ; Glauser, Gaétan ; Douet, Véronique ; Besagni, Céline ; Kessler, Felix

In: Frontiers in Plant Science, 2016, vol. 7, p. Article 1855

Carotenoids play an essential role in light harvesting and protection from excess light. During chloroplast senescence carotenoids are released from their binding proteins and are eventually metabolized. Carotenoid cleavage dioxygenase 4 (CCD4) is involved in carotenoid breakdown in senescing leaf and desiccating seed, and is part of the proteome of plastoglobules (PG), which are...