Université de Neuchâtel

A novel method for prenylquinone profiling in plant tissues by ultra-high pressure liquid chromatography-mass spectrometry

Martinis, Jacopo ; Kessler, Felix ; Glauser, Gaétan

In: Plant Methods, 2011, vol. 7, no. 1, p. Article 23

BACKGROUND: Prenylquinones are key compounds of the thylakoid membranes in chloroplasts. To understand the mechanisms involved in the response of plants to changing conditions such as high light intensity, the comprehensive analysis of these apolar lipids is an essential but challenging step. Conventional methods are based on liquid chromatography coupled to ultraviolet and fluorescence...

Université de Neuchâtel

A Chloroplast ABC1-like Kinase Regulates Vitamin E Metabolism in Arabidopsis

Martinis, Jacopo ; Glauser, Gaétan ; Valimareanu, Sergiu ; Kessler, Felix

In: Plant Physiology, 2013, vol. 162, no. 2, p. 652-662

In bacteria and mitochondria, ABC1 (for Activity of bc1 complex)-like kinases regulate ubiquinone synthesis, mutations causing severe respiration defects, including neurological disorders in humans. Little is known about plant ABC1-like kinases; in Arabidopsis (Arabidopsis thaliana), five are predicted in mitochondria but, surprisingly, six are located at lipid droplets in...

Université de Neuchâtel

ABC1K1/PGR6 kinase: a regulatory link between photosynthetic activity and chloroplast metabolism

Martinis, Jacopo ; Glauser, Gaétan ; Valimareanu, Sergiu ; Stettler, Michaela ; Zeeman, Samuel C ; Yamamoto, Hiroshi ; Shikanai, Toshiharu ; Kessler, Felix

In: The Plant Journal, 2014, vol. 77, no. 2, p. 269–283

Arabidopsis proton gradient regulation (pgr) mutants have high chlorophyll fluorescence and reduced non-photochemical quenching (NPQ) caused by defects in photosynthetic electron transport. Here, we identify PGR6 as the chloroplast lipid droplet (plastoglobule, PG) kinase ABC1K1 (activity of bc1 complex kinase 1). The members of the ABC1/ADCK/UbiB family of atypical kinases regulate...

Université de Neuchâtel

Functional characterization of three ABC1-like kinases found in the plastoglobule proteome

Martinis, Jacopo ; Kessler, Felix (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2012.

In bacteria and mitochondria, the members of the ABC1/ADCK/UbiB family regulate ubiquinone synthesis, and their mutations cause severe respiration defects, including progressive neurological disorders in humans. Little is known about plant ABC1-like kinases: in Arabidopsis thaliana five are predicted in mitochondria, but surprisingly six are located at lipid droplets (plastoglobules) in...