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Université de Fribourg

Conserved functions of ether lipids and sphingolipids in the early secretory pathway

Jiménez-Rojo, Noemi ; Leonetti, Manuel D. ; Zoni, Valeria ; Colom, Adai ; Feng, Suihan ; Iyengar, Namrata R. ; Matile, Stefan ; Roux, Aurélien ; Vanni, Stefano ; Weissman, Jonathan S. ; Riezman, Howard

In: Current Biology, 2020, vol. 30, no. 19, p. 3775-3787.e7

Sphingolipids play important roles in physiology and cell biology, but a systematic examination of their functions is lacking. We performed a genome-wide CRISPRi screen in sphingolipid-depleted human cells and identified hypersensitive mutants in genes of membrane trafficking and lipid biosynthesis, including ether lipid synthesis. Systematic lipidomic analysis showed a coordinate regulation...

Université de Fribourg

Seipin and Nem1 establish discrete ER subdomains to initiate yeast lipid droplet biogenesis

Choudhary, Vineet ; El Atab, Ola ; Mizzon, Giulia ; Prinz, William A. ; Schneiter, Roger

In: Journal of Cell Biology, 2020, vol. 219, no. 7, p. -

Lipid droplets (LDs) are fat storage organelles that originate from the endoplasmic reticulum (ER). Relatively little is known about how sites of LD formation are selected and which proteins/lipids are necessary for the process. Here, we show that LDs induced by the yeast triacylglycerol (TAG)-synthases Lro1 and Dga1 are formed at discrete ER subdomains defined by seipin (Fld1), and a...

Université de Fribourg

The yeast cell wall protein Pry3 inhibits mating through highly conserved residues within the CAP domain

Cottier, Stéphanie ; Darwiche, Rabih ; Meyenhofer, Felix ; Debelyy, Mykhaylo O. ; Schneiter, Roger

In: Biology Open, 2020, vol. 9, no. 6, p. bio053470

Members of the CAP/SCP/TAPS superfamily have been implicated in many different physiological processes, including pathogen defense, sperm maturation and fertilization. The mode of action of this class of proteins, however, remains poorly understood. The genome of Saccharomyces cerevisiae encodes three CAP superfamily members, Pry1-3. We have previously shown that Pry1 function is required...

Université de Fribourg

Metal nanoparticle–microbe interactions: synthesis and antimicrobial effects

Khan, Mujeebur R. ; Fromm, Katharina M. ; Rizvi, Tanveer F. ; Giese, Bernd ; Ahamad, Faheem ; Turner, Raymond J. ; Füeg, Michael ; Marsili, Enrico

In: Particle & Particle Systems Characterization, 2020, vol. 37, no. 5, p. 1900419

Metal nanoparticles (NPs), chalcogenides, and carbon quantum dots can be easily synthesized from whole microorganisms (fungi and bacteria) and cell‐free sterile filtered spent medium. The particle size distribution and the biosynthesis time can be somewhat controlled through the biomass/metal solution ratio. The biosynthetic mechanism can be explained through the ion‐reduction theory and...

Université de Fribourg

Metal nanoparticle–microbe interactions: synthesis and antimicrobial effects

Khan, Mujeebur R. ; Fromm, Katharina M. ; Rizvi, Tanveer F. ; Giese, Bernd ; Ahamad, Faheem ; Turner, Raymond J. ; Füeg, Michael ; Marsili, Enrico

In: Particle & Particle Systems Characterization, 2020, vol. 37, no. 5, p. 1900419

Metal nanoparticles (NPs), chalcogenides, and carbon quantum dots can be easily synthesized from whole microorganisms (fungi and bacteria) and cell‐free sterile filtered spent medium. The particle size distribution and the biosynthesis time can be somewhat controlled through the biomass/metal solution ratio. The biosynthetic mechanism can be explained through the ion‐reduction theory and...

Université de Fribourg

Proteomics-based monitoring of pathway activity reveals that blocking diacylglycerol biosynthesis rescues from alpha-synuclein toxicity

Soste, Martin ; Charmpi, Konstantina ; Lampert, Fabienne ; Gerez, Juan Atilio ; Oostrum, Marcvan ; Malinovska, Liliana ; Boersema, Paul Jonathan ; Prymaczok, Natalia Cecilia ; Riek, Roland ; Peter, Matthias ; Vanni, Stefano ; Beyer, Andreas ; Picotti, Paola

In: Cell Systems, 2019, vol. 9, no. 3, p. 309-320.e8

Proteinaceous inclusions containing alpha-synuclein (α-Syn) have been implicated in neuronal toxicity in Parkinson’s disease, but the pathways that modulate toxicity remain enigmatic. Here, we used a targeted proteomic assay to simultaneously measure 269 pathway activation markers and proteins deregulated by α-Syn expression across a panel of 33 Saccharomyces cerevisiae strains that...

Université de Fribourg

Ubiquitin release from eL40 is required for cytoplasmic maturation and function of 60S ribosomal subunits in Saccharomyces cerevisiae

Martín‐Villanueva, Sara ; Fernández‐Pevida, Antonio ; Fernández‐Fernández, José ; Kressler, Dieter ; Cruz, Jesús de la

In: The FEBS Journal, 2019, vol. 0, no. 0, p. -

Ubiquitin is generated by proteolytic cleavage of precursor proteins in which it is fused either to itself, constituting a linear polyubiquitin protein of head‐to‐tail monomers, or as a single N‐terminal moiety to one of two ribosomal proteins, eL40 (Ubi1/2 precursors) and eS31 (Ubi3 precursor). It has been proposed that the ubiquitin moiety fused to these ribosomal proteins could act...