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A unique sorting nexin regulates trafficking of potassium channels via a PDZ domain interaction
Abstract
G protein-gated potassium (Kir3) channels are important for controlling neuronal excitability in the brain. Using a proteomics approach, we have identified a unique rodent intracellular protein, sorting nexin 27 (SNX27), which regulates the trafficking of Kir3 channels. Like most sorting nexins, SNX27 possesses a functional PX domain that selectively binds the membrane phospholipid phosphatidylinositol-3-phosphate (PI3P) and is important for trafficking to the early endosome. SNX27, however, is the only sorting nexin to contain a PDZ domain. This PDZ domain discriminates between channels with similar class I PDZ-binding motifs, associating with the C-terminal end of Kir3.3 and Kir3.2c (-ESKV), but not with that of Kir2.1 (-ESEI) or Kv1.4 (-ETDV). SNX27 promotes the endosomal movement of Kir3 channels, leading to reduced surface expression, increased degradation and smaller Kir3 potassium currents. The regulation of endosomal trafficking via sorting nexins reveals a previously unknown mechanism for controlling potassium channel surface expression.
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Both SNX17 and SNX27 can interact with PI(3)P through their PX domains.
“both interact with the signaling lipid PI(3)P via their PX domains”
From PI(3)P coordinates SNX17- and SNX27-dependent protein recycling for long-term synaptic plasticity (2025) · cites this paper as Lunn et al., 2007
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Metadata
- Authors
- Lunn, M.-L., Nassirpour, R., Arrabit, C., Tan, J., Mcleod, I., Arias, C. M., Sawchenko, P. E., Yates, J. R., & Slesinger, P. A.
- Venue
- Nature Neuroscience
- Published
- 2007-09-02
- Volume
- 10
- Issue
- 10
- Pages
- 1249-1259
- ISSN
- 1097-6256
- 1546-1726
- Cited by
- 151
- References
- 1
- Language
- en
- Licence
- www.springer.com/tdm (tdm)
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