Abstract
Besides its protective role in the maintenance of cell homeostasis, the plasma membrane is the site of exchanges between the cell interior and the extracellular medium. To circumvent the hydrophobic barrier formed by the acyl chains of the lipid bilayer, protein channels and transporters are key players in the exchange of small hydrophilic compounds such as ions or nutrients, but they hardly account for the transport of larger biological molecules. Exchange of proteins usually relies on membrane-fusion events between vesicles and the plasma membrane. In recent years, several alternative unconventional protein secretion (UPS) pathways across the plasma membrane have been characterised for a specific set of secreted substrates, some of them excluding any membrane-fusion events (Dimou and Nickel, Curr Biol 28:R406–R410, 2018). One of thesbe pathways, referred as type I UPS, relies on the direct translocation of the protein across the plasma membrane and not surprisingly, lipids are essential players in this process. In this chapter, we discuss the roles of phosphatidylinositol(4,5)bisphosphate (PI(4,5)P2) and cholesterol in unconventional pathways involving Engrailed-2 homeoprotein and fibroblast growth factor 2.
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Abbreviations
- CPP:
-
cell penetrating peptides
- EN2:
-
Engrailed-2 homeoprotein
- ER:
-
endoplasmic reticulum
- FGF2:
-
fibroblast growth factor 2
- FITC:
-
fluorescein isothiocyanate
- HIV:
-
human immunodeficiency virus
- IP:
-
inositol phosphate
- PC:
-
phosphatidylcholine
- PG:
-
phosphatidylglycerol
- PHPLC:
-
Pleckstrin homology domain of phospholipase C ∂
- PI(4)P:
-
phosphatidylinositol(4)phosphate
- PI(4,5)P2:
-
phosphatidylinositol(4,5)bisphosphate
- PS:
-
phosphatidylserine
- RUSH:
-
retention using selective hook
- SRP:
-
signal recognition particle
- UPS:
-
unconventional protein secretion
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Joliot, A. (2023). Role of PI(4,5)P2 and Cholesterol in Unconventional Protein Secretion. In: Dantsker, A.R. (eds) Cholesterol and PI(4,5)P2 in Vital Biological Functions. Advances in Experimental Medicine and Biology, vol 1422. Springer, Cham. https://doi.org/10.1007/978-3-031-21547-6_14
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DOI: https://doi.org/10.1007/978-3-031-21547-6_14
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