Cell Biology
MERLIN: a novel BRET-based proximity biosensor for studying mitochondria–ER contact sitesMERLIN is a novel biosensor that generates a BRET signal with a signal-to-noise ratio that is sufficient to enable sensing the proximity between the mitochondria and the ER without forcing interaction or establishing artificial connections at the MERCs.
TspanC8 tetraspanins differentially regulate ADAM10 endocytosis and half-lifeThis study demonstrates that the tetraspanins Tspan5 and Tspan15 which directly associate with the metalloprotease ADAM10 have an opposite impact on its endocytosis and half-life.
ADAP1 promotes invasive squamous cell carcinoma progression and predicts patient survivalADAP1, a GTPase-activating protein (GAP) for the small GTPase ARF6, is a strong predictor of poor survival in early-stage squamous cell carcinoma patients and a critical mediator of TGF-β-induced invasive cell migration by facilitating basement membrane breakdown.
The role of MHC class I recycling and Arf6 in cross-presentation by murine dendritic cellsMHC-I internalization and recycling in DCs neither requires Arf6 nor provides MHC-I to the Rab11+ endocytic recycling compartment; however, cross-presentation of immune complexes depends on Arf6.
Plasticity in salt bridge allows fusion-competent ubiquitylation of mitofusins and Cdc48 recognitionMitochondrial fusion requires an alternating salt bridge between CMT2A-associated disease residues that enable GTP hydrolysis; Fzo1 ubiquitylation then licenses post-fusion recycling by Cdc48.
TMEM16A chloride channel does not drive mucus productionDespite being essential for airway hydration, TMEM16A is not required for mucus (MUC5AC) production. Cell proliferation is the main driver for TMEM16A up-regulation during inflammation.
Pseudomonas aeruginosa lectin LecB impairs keratinocyte fitness by abrogating growth factor signallingThis study provides a novel function of the bacterial lectin LecB, which dampens cell proliferation and survival by targeting the insulin-like growth factor-1 for degradation, without receptor activation.
Nrf2 signaling links ER oxidative protein folding and calcium homeostasis in health and diseaseOxidative protein folding in the ER generates ROS, leading to Nrf2-dependent feedback on protein folding via ER calcium level modulation. This feedback loop is suppressed in ALS-associated mutant astrocytes but can be rescued by dimethyl fumarate.
Oct4 mediates Müller glia reprogramming and cell cycle exit during retina regeneration in zebrafishThe rapid induction of pluripotency-inducing factor Oct4 in the injured retina necessitates the de novo induction of stem cells and their subsequent cell cycle exit.
Mechanistic insights into the protective roles of polyphosphate against amyloid cytotoxicityThis study provides novel insights into the mechanisms by which presence of polyP alters the formation, structural properties, and cytotoxic effects of α-synuclein fibers.