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Université de Fribourg

Raft-like lipid microdomains drive autophagy initiation via AMBRA1-ERLIN1 molecular association within MAMs

Manganelli, Valeria ; Matarrese, Paola ; Antonioli, Manuela ; Gambardella, Lucrezia ; Vescovo, Tiziana ; Gretzmeier, Christine ; Longo, Agostina ; Capozzi, Antonella ; Recalchi, Serena ; Riitano, Gloria ; Misasi, Roberta ; Dengjel, Jörn ; Malorni, Walter ; Fimia, Gian Maria ; Sorice, Maurizio ; Garofalo, Tina

In: Autophagy, 2020, p. 1-21

Mitochondria-associated membranes (MAMs) are essential communication subdomains of the endoplasmic reticulum (ER) that interact with mitochondria. We previously demonstrated that, upon macroautophagy/autophagy induction, AMBRA1 is recruited to the BECN1 complex and relocalizes to MAMs, where it regulates autophagy by interacting with raft-like components. ERLIN1 is an endoplasmic reticulum...

Université de Fribourg

Protein complexes and neighborhoods driving autophagy

Siva Sankar, Devanarayanan ; Dengjel, Jörn

In: Autophagy, 2020, vol. 0, no. 0, p. 1–17

Autophagy summarizes evolutionarily conserved, intracellular degradation processes targeting cytoplasmic material for lysosomal degradation. These encompass constitutive processes as well as stress responses, which are often found dysregulated in diseases. Autophagy pathways help in the clearance of damaged organelles, protein aggregates and macromolecules, mediating their recycling and ...

Università della Svizzera italiana

Virus-like particles and nanoparticles for vaccine development against HCMV

Perotti, Michela ; Perez, Laurent

In: Viruses, 2020, vol. 12, no. 1, p. 17 p

Human cytomegalovirus (HCMV) infects more than 70% of the human population worldwide. HCMV is responsible for high morbidity and mortality in immunocompromised patients and remains the leading viral cause of congenital birth defects. Despite considerable efforts in vaccine and therapeutic development, HCMV infection still represents an unmet clinical need and a life-threatening disease in...

Università della Svizzera italiana

Proteasomal and lysosomal clearance of faulty secretory proteins : ER-associated degradation (ERAD) and ER-to-lysosome-associated degradation (ERLAD) pathways

Fregno, Ilaria ; Molinari, Maurizio

In: Critical reviews in biochemistry and molecular biology, 2019, vol. 54, no. 2, p. 153-163

About 40% of the eukaryotic cell’s proteins are inserted co- or post-translationally in the endoplasmic reticulum (ER), where they attain the native structure under the assistance of resident molecular chaperones and folding enzymes. Subsequently, these proteins are secreted from cells or are transported to their sites of function at the plasma membrane or in organelles of the secretory and ...

Université de Fribourg

Initial viral inoculum determines kinapse-and synapse-like t cell motility in reactive lymph nodes

Sivapatham, Sujana ; Ficht, Xenia ; Albuquerque, Juliana Barreto de ; Page, Nicolas ; Merkler, Doron ; Stein, Jens V.

In: Frontiers in Immunology, 2019, vol. 10, p. -

T cell activation in lymphoid tissue occurs through interactions with cognate peptide- major histocompatibility complex (pMHC)-presenting dendritic cells (DCs). Intravital imaging studies using ex vivo peptide-pulsed DCs have uncovered that cognate pMHC levels imprint a wide range of dynamic contacts between these two cell types. T cell—DC interactions vary between transient,...

Università della Svizzera italiana

Endoplasmic reticulum turnover : ER-phagy and other flavors in selective and non-selective ER clearance

Fregno, Ilaria ; Molinari, Maurizio

In: F1000Research, 2018, vol. 7, p. 454

The endoplasmic reticulum (ER) is a highly dynamic organelle in eukaryotic cells. It is deputed to lipid and protein biosynthesis, calcium storage, and the detoxification of various exogenous and endogenous harmful compounds. ER activity and size must be adapted rapidly to environmental and developmental conditions or biosynthetic demand. This is achieved on induction of thoroughly studied...

Università della Svizzera italiana

Crystal structure and size-dependent neutralization properties of HK20, a human monoclonal antibody binding to the highly conserved heptad repeat 1 of gp41

Sabin, Charles ; Corti, Davide ; Buzon, Victor ; Seaman, Mike S. ; Hulsik, David Lutje ; Hinz, Andreas ; Vanzetta, Fabrizia ; Agatic, Gloria ; Silacci, Chiara ; Mainetti, Lara ; Scarlatti, Gabriella ; Sallusto, Federica ; Weiss, Robin ; Lanzavecchia, Antonio ; Weissenhorn, Winfried

In: Plos pathogens, 2010, vol. 6, no. 11, p. e1001195

The human monoclonal antibody (mAb) HK20 neutralizes a broad spectrum of primary HIV-1 isolates by targeting the highly conserved heptad repeat 1 (HR1) of gp41, which is transiently exposed during HIV-1 entry. Here we present the crystal structure of the HK20 Fab in complex with a gp41 mimetic 5-Helix at 2.3 A° resolution. HK20 employs its heavy chain CDR H2 and H3 loops to bind into a...