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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

Understanding the assembly of amphiphilic additives in bulk and dispersed non-lamellar lipid-based matrices: Phosphorylation, H-bonding and ionisation

F.Etter, Marco ; Dellenbach, Daria ; Petri-Fink, Alke ; Rothen-Rutishauser, Barbara ; M.Landau, Ehud ; Fong, Wye-Khay

In: Journal of Colloid and Interface Science, 2020, vol. 562, p. 502–510

The aqueous channel size of lipidic cubic phases can be a limiting factor for certain applications. For this reason, additives have been used to exquisitely control their nanostructure. In this study, two families of primary phosphoesters have been designed, synthesised and utilised to determine the effect of the positioning of the guest additive at the interface of the host mesophase, and to...

Université de Fribourg

Structure and dynamics of the acyl chains in the membrane trafficking and enzymatic processing of lipids

Vanni, Stefano ; Riccardi, Laura ; Palermo, Giulia ; De Vivo, Marco

In: Accounts of Chemical Research, 2019, vol. 52, no. 11, p. 3087–3096

The regulatory chemical mechanisms of lipid trafficking and degradation are involved in many pathophysiological processes, being implicated in severe pain, inflammation, and cancer. In addition, the processing of lipids is also relevant for industrial and environmental applications. However, there is poor understanding of the chemical features that control lipid membrane trafficking and allow...

Université de Fribourg

Communication Accommodation Theory

Giles, Howard ; Ogay, Tania

In: Explaining communication : contemporary theories and exemplars, 2007, p. 293-310

Communication Accommodation Theory (CAT) provides a wide-ranging framework aimed at predicting and explaining many of the adjustments individuals make to create, maintain,or decrease social distance in interaction. It explores the different ways in which we accommodate our communication, our motivations for doing so, and the consequences. CAT addresses interpersonal communication issues, yet...

Université de Fribourg

Crystal Structure of Borrelia turicatae protein, BTA121, a differentially regulated gene in the tick-mammalian transmission cycle of relapsing fever spirochetes

Luo, Zhipu ; Kelleher, Alan J. ; Darwiche, Rabih ; Hudspeth, Elissa M. ; Shittu, Oluwatosin K. ; Krishnavajhala, Aparna ; Schneiter, Roger ; Lopez, Job E. ; Asojo, Oluwatoyin A.

In: Scientific Reports, 2017, vol. 7, no. 1, p. 15310

Tick-borne relapsing fever (RF) borreliosis is a neglected disease that is often misdiagnosed. RF species circulating in the United States include Borrelia turicatae, which is transmitted by argasid ticks. Environmental adaptation by RF Borrelia is poorly understood, however our previous studies indicated differential regulation of B. turicatae genes localized on the 150 kb linear...