Sorting of secretory proteins at the trans-Golgi network by human TGN46.

Secretory proteins are sorted at the trans-Golgi network (TGN) for export into specific transport carriers. However, the molecular players involved in this fundamental process remain largely elusive. Here, we identified the human transmembrane protein TGN46 as a receptor for the export of secretory cargo protein PAUF in CARTS - a class of protein kinase D-dependent TGN-to-plasma membrane carriers. We show that TGN46 is necessary for cargo sorting and loading into nascent carriers at the TGN. By combining quantitative fluorescence microscopy and mutagenesis approaches, we further discovered that the lumenal domain of TGN46 encodes for its cargo sorting function. In summary, our results define a cellular function of TGN46 in sorting secretory proteins for export from the TGN. © 2023, Lujan et al.

Citation

Pablo Lujan, Carla Garcia-Cabau, Yuichi Wakana, Javier Vera Lillo, Carmen Rodilla-Ramírez, Hideaki Sugiura, Vivek Malhotra, Xavier Salvatella, Maria F Garcia-Parajo, Felix Campelo. Sorting of secretory proteins at the trans-Golgi network by human TGN46. eLife. 2024 Mar 11;12

Mesh Tags

Substances

PMID: 38466628

search → result