| First Author | Jeong J | Year | 2019 |
| Journal | Proc Natl Acad Sci U S A | Volume | 116 |
| Issue | 24 | Pages | 12035-12044 |
| PubMed ID | 31138690 | Mgi Jnum | J:276565 |
| Mgi Id | MGI:6314626 | Doi | 10.1073/pnas.1821775116 |
| Citation | Jeong J, et al. (2019) PSD-95 binding dynamically regulates NLGN1 trafficking and function. Proc Natl Acad Sci U S A 116(24):12035-12044 |
| abstractText | PSD-95 is a scaffolding protein that regulates the synaptic localization of many receptors, channels, and signaling proteins. The NLGN gene family encodes single-pass transmembrane postsynaptic cell adhesion molecules that are important for synapse assembly and function. At excitatory synapses, NLGN1 mediates transsynaptic binding with neurexin, a presynaptic cell adhesion molecule, and also binds to PSD-95, although the relevance of the PSD-95 interaction is not clear. We now show that disruption of the NLGN1 and PSD-95 interaction decreases surface expression of NLGN1 in cultured neurons. Furthermore, PKA phosphorylates NLGN1 on S839, near the PDZ ligand, and dynamically regulates PSD-95 binding. A phosphomimetic mutation of NLGN1 S839 significantly reduced PSD-95 binding. Impaired NLGN1/PSD-95 binding diminished synaptic NLGN1 expression and NLGN1-mediated synaptic enhancement. Our results establish a phosphorylation-dependent molecular mechanism that regulates NLGN1 and PSD-95 binding and provides insights into excitatory synaptic development and function. |
