ArticleNature communications2026
Glycoprotein-induced phase separation drives unconventional secretion of galectin-3.
Article in Nature communications, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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17 authors.
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Abstract
The mechanism of unconventional protein secretion remains an unresolved issue. Here, we describe an unconventional protein secretion pathway for galectin-3 that is mediated by phase separation and condensation. Using four lysosomal damage models, we observed a rapid, pronounced release of galectin-3 in large, non-exosomal particles. This secretion is driven by glycoprotein-induced galectin-3 phase separation and is independent of pyroptosis and secretory autophagy. During phase separation, the S-face of galectin-3 carbohydrate recognition domain binds glycoproteins that triggers galectin-3 N-terminal tail release and condensation. These condensates then recruit ALG-2 via the exposed N-terminal tail. ALG-2 directs the condensates to the endoplasmic reticulum-late endosome interface. After translocation into late endosomes, galectin-3 condensates are secreted into the extracellular milieu by SNARE-dependent vesicular transport. This mechanism of exporting phase-separated protein condensates may serve as a clean-up response to membrane damage.
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