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Updated: May 3, 2026

A High-content Assay for Monitoring AMPA Receptor Trafficking
Published on: January 28, 2019
A role for sorting nexin 27 in AMPA receptor trafficking
Li Shen Loo1, Ning Tang2, Muthafar Al-Haddawi3
11] Institute of Molecular and Cell Biology, Singapore 138673, Singapore [2] Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore 637553, Singapore.
Abstract:
Sorting nexin 27 (SNX27), a PDZ domain-containing endosomal protein, was recently shown to modulate glutamate receptor recycling in Down's syndrome. However, the precise molecular role of SNX27 in GluA1 trafficking is unclear. Here we report that SNX27 is enriched in dendrites and spines, along with recycling endosomes. Significantly, the mobilization of SNX27 along with recycling endosomes into spines was observed. Mechanistically, SNX27 interacts with K-ras GTPase via the RA domain; and following chemical LTP stimuli, K-ras is recruited to SNX27-enriched endosomes through a Ca(2+)/CaM-dependent mechanism, which in turn drives the synaptic delivery of homomeric GluA1 receptors. Impairment of SNX27 prevents LTP and associated trafficking of AMPARs. These results demonstrate a role for SNX27 in neuronal plasticity, provide a molecular explanation for the K-ras signal during LTP and identify SNX27 as the PDZ-containing molecular linker that couples the plasticity stimuli to the delivery of postsynaptic cargo.
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