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Phosphoinositides and PIPs

Phosphoinositides and PIPs

Phosphoinositides are a group of phospholipids containing a glycerol backbone with two fatty acid chains and a phosphate attached to a myoinositol sugar ring. The inositol head group extends into the cytoplasm, where it is modified by adding phosphate groups to form phosphatidylinositol phosphates or PIPs.
Different phosphoinositides are synthesized and recruited on the cytosolic face of the plasma membrane. The localization of specific phosphoinositides concentrated in separate membrane...

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Region-Specific Phosphorylation Determines Neuroligin-3 Localization to Excitatory Versus Inhibitory Synapses.

Bekir Altas¹, Liam P Tuffy², Annarita Patrizi³

¹Department of Pharmacology, University of Maryland School of Medicine, Baltimore, Maryland.

Biological Psychiatry

|December 28, 2023

Summary

Neuroligin-3 shows region-specific synapse localization in the brain, determined by phosphorylation. This discovery offers new insights into neurological conditions affecting excitation-inhibition balance.

Keywords:

Autism Excitatory synapse Inhibitory synapse Neuroligin Phosphorylation Scaffolding protein

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Area of Science:

Neuroscience
Molecular Biology
Synaptic Plasticity

Background:

Neuroligin-3 is a postsynaptic adhesion molecule crucial for synapse development and function.
It is implicated in autism spectrum disorder and glioma progression.
The synapse-type specificity of neuroligin-3 remains largely uncharacterized.

Purpose of the Study:

To investigate the region-specific synaptic localization of neuroligin-3 in the brain.
To identify the molecular mechanisms regulating neuroligin-3's localization to different synapse types.
To understand the role of neuroligin-3 phosphorylation in synapse specificity.

Main Methods:

Validated antibody specificity in knockout animals for mouse and human brain samples.
Employed phospho-specific neuroligin antibody, phosphoproteomics, and cell-based assays.
Utilized in utero CRISPR/Cas9 knockout and gene replacement techniques.

Main Results:

Neuroligin-3 displayed region-dependent synapse specificity: excitatory in cortical regions, inhibitory in subcortical regions (mice and humans).
Cortical neuroligin-3 phosphorylation at a key binding site disrupted inhibitory synapse recruitment.
Phosphomimetic mutants localized to excitatory synapses, while phospho-null mutants localized to inhibitory synapses.

Conclusions:

Neuroligin-3 exhibits unexpected region-specific synapse localization.
Phosphorylation-dependent mechanisms regulate neuroligin-3 recruitment to excitatory or inhibitory synapses.
Findings contribute to understanding neuroligin-3's role in conditions affecting excitation-inhibition balance.