bioRxiv Science⌕ Search
Home/Archive/bioRxiv

bioRxiv · 10.1101/2021.04.08.439013

Snazarus and its human ortholog SNX25 regulate autophagic flux by affecting VAMP8 endocytosis

Lauzier, A.·Bossanyi, M.-F.·Ugrankar, R.·Henne, M.·Jean, S.
View original source ↗Export metadata ↓

Abstract

Autophagy, the degradation and recycling of cytosolic components in the lysosome, is an essential cellular mechanism. It is a membrane-mediated process that is linked to vesicular trafficking events. The sorting nexin (SNX) protein family controls the sorting of a large array of cargoes, and various SNXs can impact autophagy. To gain a better understanding of their functions in vivo under nutrient starvation, we screened all Drosophila SNXs by RNAi in the fat body. Significantly, depletion of snazarus (snz) strongly impacted autolysosome formation and led to decreased autophagic flux. Interestingly, we observed altered distribution of Vamp7-positive vesicles with snz depletion and snz roles were conserved in human cells. SNX25 is the closest ortholog to snz, and we demonstrate a role for it in VAMP8 trafficking. We found that this activity was dependent on the SNX25 PX domain, and independent of SNX25 anchoring at the ER. We also demonstrate that differentially spliced forms of SNX14 and SNX25 are present in cancer cells. This work identifies a conserved role for snz/SNX25 as regulators of autophagic flux, and show differential isoform expression between orthologs.

Explore related subjects

cell biologyPreprint

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

Lauzier, A., Bossanyi, M.-F., Ugrankar, R., Henne, M., Jean, S.. 2021-04-08. Snazarus and its human ortholog SNX25 regulate autophagic flux by affecting VAMP8 endocytosis. https://doi.org/10.1101/2021.04.08.439013

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related preprints

bioRxiv2026

HUH-tag conjugation enables accessible, site-specific functionalization of DNA origami with signaling-competent proteins

DNA origami enables precise nanometer scale control over the number, spacing, and geometry of biomolecules, making it a powerful tool for dissecting spatially organized biological processes such as receptor signaling. However, functionalizing origami with proteins remains a bottleneck restricting the technology to specialized laboratories. Here we show that viral-derived HUH endonuclease tags, small (~10 kDa) domains that form a covalent phosphotyrosine bond with short unmodified ssDNA, provide a simple and cost-effective route to decorating DNA origami with functional proteins. Using interleukin-1{beta} (IL-1{beta}) as a model ligand, we generated recombinant IL-1{beta}-HUH, achieved efficient site-specific conjugation to unmodified ssDNA within minutes, and coupled the conjugates to a DNA origami pegboard with tunable stoichiometry. IL-1{beta}-functionalized origami triggered ligand-dependent signalling in living cells and allowed visualization of the recruitment of downstream signaling molecules, confirming that HUH-tag conjugation preserves functionality. Because this strategy requires only standard molecular biology equipment and unmodified DNA, it lowers a technical and financial barrier to DNA origami-based experimentation, opening the approach to a broader range of biological questions and laboratories outside the DNA nanotechnology field.

cell biology↗
bioRxiv2026

Global mapping of VEGF-A driven changes in the RNA bound phospho-proteome reveals a molecular switch to coordinate angiogenesis in endothelial cells

RNA binding proteins (RBPs) serve as upstream master regulators of cellular fate transitions at the post-transcriptional level. RBP-RNA interactions are dynamically regulated by post-translational modifications to coordinate cellular responses. We hypothesised that changes in RBP phosphorylation will play a key role in coordinating angiogenesis, the formation of new blood vessels, in endothelial cells (ECs). Therefore, we used phospho-proteomic analysis of the mRNA bound proteome to identify global phosphorylation changes in mouse cardiac ECs during acute and prolonged VEGF-A stimulation. Of the differentially phosphorylated RBPs, we found that the phosphorylation of serine 199 within mRNA bound Phf6 (PHD finger protein 6) was consistently increased following VEGF-A stimulation. Phf6 phosphorylation at this specific site was sufficient and required to induce a pro-angiogenic phenotype, facilitating a change in Phf6 conformation promoting interaction with distinct RNAs. We show here that Phf6 phosphorylation at serine 199, downstream of VEGF-A, acts as a molecular switch to differentially coordinate a decrease of anti-angiogenic RNAs (i.e. extracellular matrix genes) and an increase in pro-angiogenesis related RNAs, in part by differentially regulating their stability, to promote angiogenesis.

cell biology↗
bioRxiv2026

Metaplasia Orchestrates Tissue Recovery and Immune Remodeling Through CD73 in Chronic Pancreatitis

Chronic inflammatory injury promotes epithelial metaplasia, and progression from metaplasia to dysplasia is a recognized initiating event in carcinogenesis, as metaplastic cells exhibit heightened susceptibility to genetic alterations. In the pancreas, persistent acinar-to-ductal metaplasia (ADM) can progress to pancreatic intraepithelial neoplasia (PanIN), yet the mechanisms that determine whether ADM resolves or persists with fibrosis and sustained inflammation remain poorly defined. Here, we identify CD73 as a central regulator of ADM fate, tissue repair, and immune microenvironment remodeling during chronic pancreatic injury. Analysis of previously published single-cell RNA sequencing dataset from chronic pancreatitis (CP) tissues identified enrichment of Nt5e, which encodes CD73, within Hnf1{beta} ADM populations. Hnf1bCreERT2 and CD73fl/fl;Hnf1bCreERT2 mice were treated with caerulein for 4 weeks to induce pancreatitis and ADM prior to tamoxifen-induced deletion of CD73 in HNF1B-expressing metaplastic epithelial cells. Histologic phenotyping and immune profiling were performed using immunohistochemistry and imaging mass cytometry. Metaplasia-specific CD73 deletion exacerbated pancreatic injury and fibrosis, impaired epithelial proliferation and recovery of the acinar compartment, and altered the abundance and spatial organization of inflammatory cells. Ex vivo ADM assays further demonstrated that CD73 loss increased ADM formation and the production of MCP-1 and TIMP-1. These findings identify CD73 as a context-dependent checkpoint linking epithelial plasticity and immune modulation during chronic pancreatic injury and tissue repair.

cell biology↗