ArticleThe Journal of cell biology2025
The pathway of unconventional protein secretion involves CUPS and a modified trans-Golgi network.
Article in The Journal of cell biology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 7 papers.
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Who cites it
7 citing papers in PubMed.
- Beyond ER-Golgi trafficking: unconventional protein secretion as a new design frontier for synthetic secretion switches in mammalian cells.Communications biology · 2026Review
- The ER-Golgi intermediate compartment: a central hub integrating membrane trafficking and stress responses.EMBO reports · 2026Review
- Dual-Organelle Secretome Conjugation and Organ-Uptake Tracking (DuO-SCOUT) Enables Deep and Sensitive Mapping of the Secreted Proteins.Advanced science (Weinheim, Baden-Wurttemberg, Germany) · 2026Article
- Review
- Unconventional Protein Transport Across the Golgi Ribbon.Sub-cellular biochemistry · 2026Review
- Beyond the Secretory Pathway: New Insights Into Protein Release.Traffic (Copenhagen, Denmark) · 2025Review
- A Sensitive and Versatile Cell-Based Assay Combines Luminescence and Trapping Approaches to Monitor Unconventional Protein Secretion.Traffic (Copenhagen, Denmark) · 2025Article
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Authors and funding
6 authors.
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Abstract
Compartment for unconventional protein secretion (CUPS), a compartment for secretion of signal sequence-lacking proteins, forms through COPI-independent extraction of membranes from early Golgi cisternae, lacks Golgi-specific glycosyltransferases, and requires phosphatidylinositol 4-phosphate (PI4P) for biogenesis, as well as phosphatidylinositol 3-phosphate for stability. Our findings demonstrate that Drs2, a PI4P effector from the trans-Golgi network (TGN), is essential for CUPS formation, specifically through its interaction with Rcy1, and Rcy1 is crucial for the unconventional secretion. Using 4D super-resolution confocal live imaging microscopy, we observed that CUPS interact with a modified TGN that contains Drs2 in addition to proteins Tlg2 and Snc2, which are necessary for membrane fusion. Notably, while CUPS remain stable, the modified TGN undergoes remodeling during the later stages of unconventional secretion. In summary, we suggest that CUPS and the modified TGN, without the function of COPII and COPI, participate in collecting and sorting unconventionally secreted proteins, reflecting the role of Golgi membranes in receiving cargo from the ER during conventional secretion.
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