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Published on: February 15, 2017
LGI1-ADAM22 complex organizes PSD93 clustering at the axon initial segment
Wenying Zhang1,2, Shuyi Tan2, Xiaoyu Teng2
1College of Life Sciences, Beijing Normal University, Beijing 100875, China.
Journal of Cell Science
|July 8, 2026
Summary
The LGI1-ADAM22 complex organizes postsynaptic density-93 (PSD93) clustering at the axon initial segment (AIS). This interaction is crucial for assembling key neuronal proteins at the AIS membrane.
Area of Science:
- Neuroscience
- Molecular Biology
- Cell Biology
Background:
- Postsynaptic density-93 (PSD93) is a scaffolding protein crucial for synaptic and axonal membrane organization.
- PSD93's precise clustering mechanism at the axon initial segment (AIS) is not fully understood.
Purpose of the Study:
- To elucidate the molecular mechanism regulating PSD93 clustering at the AIS.
- To identify proteins involved in recruiting PSD93 to the AIS.
Main Methods:
- Localization studies of LGI1 and ADAM22 in forebrain neurons.
- Analysis of genetic knockout mice lacking LGI1 or ADAM22.
- Investigation of PSD93 recruitment to the plasma membrane via ADAM22's PDZ-binding motif.
Main Results:
- LGI1 and ADAM22 are localized at the AIS of forebrain neurons.
- LGI1 and ADAM22 are reciprocally required for their AIS clustering.
- The LGI1-ADAM22 complex is essential for PSD93 clustering at the AIS.
- ADAM22 recruits PSD93 to the plasma membrane through its PDZ-binding motif.
Conclusions:
- The LGI1-ADAM22 complex acts as a critical organizer of PSD93 clustering at the AIS.
- This interaction highlights a novel mechanism for scaffolding protein localization at neuronal compartments.
