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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-Arias, Mónica Alexandra ; Kessler, Felix (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2017.

The chloroplast constitutes the site of photosynthesis and is an essential organelle in plant cells. An endosymbiotic event was at the origin of the chloroplast, an ancestral eukaryotic cell engulfing a photosynthetic cyanobacterium. During evolution, the majority of ancestral chloroplast genes were lost or transferred to the nucleus. The protein products of the successfully transferred genes are...

Consortium of Swiss Academic Libraries

Starch mobilization in leaves

Smith, Alison M. ; Zeeman, Samuel C. ; Thorneycroft, David ; Smith, Steven M.

In: Journal of Experimental Botany, 2003, vol. 54, no. 382, p. 577-583

Consortium of Swiss Academic Libraries

Nitrogen metabolism and remobilization during senescence

Hörtensteiner, Stefan ; Feller, Urs

In: Journal of Experimental Botany, 2002, vol. 53, no. 370, p. 927-937

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

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...

Université de Neuchâtel

Plastoglobules : a new destination for recombinant proteins produced in transplastomic plants and characterization of plastidial At-SOUL heme binding protein

Venkatasalam, Shanmugabalaji ; Kessler, Felix (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2012.

Plastoglobules (PG) are lipid droplets existing in most types of plastids. Plastoglobulins (PGL) also known as fibrillins (FBN) are evolutionary conserved proteins present at the surface of PG, but to various extents also at the thylakoid membrane. PGLs are thought to have a structural function in PG, and it is known that almost the complete protein is required for PGLs to assemble on PG. Here,...

Université de Neuchâtel

Intersection of the tocopherol and plastoquinol metabolic pathways at the plastoglobule

Zbierzak, Anna Maria ; Kanwischer, Marion ; Wille, Christina ; Vidi, Pierre-Alexandre ; Giavalisco, Patrick ; Lohmann, Antje ; Briesen, Isabel ; Porfirova, Svetlana ; Bréhélin, Claire ; Kessler, Felix ; Dörmann, Peter

In: Biochemical Journal, 2010, vol. 425, p. 389-399

Plastoglobules, lipid–protein bodies in the stroma of plant chloroplasts, are enriched in non-polar lipids, in particular prenyl quinols. In the present study we show that, in addition to the thylakoids, plastoglobules also contain a considerable proportion of the plastidial PQ-9 (plastoquinol-9), the redox component of photosystem II, and of the cyclized product of PQ-9, PC-8...