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A trans-synaptic IgLON adhesion molecular complex directly contacts and clusters a nicotinic receptor

Morgane Mialon, Liubov Patrash, Alexis Weinreb

    Biorxiv : the Preprint Server for Biology
    |September 24, 2024
    PubMed

    Insights

    Researchers discovered a new way ionotropic acetylcholine receptors (AChRs) are localized at synapses. This involves direct interaction with IgLON family cell adhesion molecules, a mechanism conserved across species and potentially relevant to brain diseases.

    Area of Science:

    • Neuroscience
    • Molecular Biology
    • Cell Biology

    Background:

    • Synaptic transmission relies on precise neurotransmitter receptor localization.
    • Ionotropic acetylcholine receptors (AChRs) are crucial for synaptic function.

    Purpose of the Study:

    • To identify novel mechanisms governing synaptic localization of ionotropic acetylcholine receptors (AChRs).
    • To investigate the role of IgLON family proteins in AChR synaptic targeting.

    Main Methods:

    • Utilized *C. elegans* as a model organism.
    • Investigated interactions between IgLON proteins (RIG-5, ZIG-8) and an AChR subunit (ACR-16).
    • Analyzed protein interactions using *in vivo* and domain-specific analyses.

    Main Results:

    • Identified a novel synaptic localization mechanism for AChRs.
    • Demonstrated direct interaction between IgLON proteins (RIG-5 and ZIG-8) and the ACR-16 AChR subunit.
    • Showcased a specific *cis*-interaction involving IgLON Ig domains and the AChR extracellular domain.

    Conclusions:

    • A novel paradigm for synaptic localization of ionotropic acetylcholine receptors (AChRs) involves direct interaction with IgLON family cell adhesion molecules.
    • This conserved mechanism may extend to mammalian nervous systems and IgLON-associated brain diseases.

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