title: Cerebellin-2 Protein <div class="infobox infobox-protein"> [@bowers2012]
| Property | Value | [@pulst1996] |----------|-------| [@vi2019] | Protein Name | Cerebellin-2 | | Gene | CBLN2 | | UniProt ID | Q9NZU5 | | Molecular Weight | ~32 kDa | | Subcellular Localization | Secreted, extracellular matrix | | Protein Family | Cerebellin family | | Aliases | CBLN2, Cerebellin-2 |
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Overview
Cerebellin-2 (CBLN2) is a member of the Cerebellin family of secreted proteins that play crucial roles in synaptic connectivity and neuronal communication in the central nervous system. Originally identified for its expression in the cerebellum, CBLN2 has emerged as an important regulator of synapse formation and function throughout the brain, with particular relevance to cerebellar circuits, hippocampal plasticity, and cortical connectivity [1][2]. The CBLN family consists of four members (CBLN1-4), with CBLN2 being widely expressed in both cerebellar and extra-cerebellar regions. CBLN2 functions as a synaptogenic molecule, promoting the formation of excitatory synapses by bridging presynaptic neurexins with postsynaptic glutamate receptors [3]. Dysregulation of CBLN2 has been implicated in neurodevelopmental disorders, particularly autism spectrum disorder (ASD), and in neurodegenerative conditions affecting cerebellar function.
Structure
CBLN2 possesses the conserved cerebellin domain characteristic of the CBLN family:
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Cerebellin-2 Protein
title: Cerebellin-2 Protein <div class="infobox infobox-protein"> [@bowers2012]
| Property | Value | [@pulst1996] |----------|-------| [@vi2019] | Protein Name | Cerebellin-2 | | Gene | CBLN2 | | UniProt ID | Q9NZU5 | | Molecular Weight | ~32 kDa | | Subcellular Localization | Secreted, extracellular matrix | | Protein Family | Cerebellin family | | Aliases | CBLN2, Cerebellin-2 |
</div>
Overview
Cerebellin-2 (CBLN2) is a member of the Cerebellin family of secreted proteins that play crucial roles in synaptic connectivity and neuronal communication in the central nervous system. Originally identified for its expression in the cerebellum, CBLN2 has emerged as an important regulator of synapse formation and function throughout the brain, with particular relevance to cerebellar circuits, hippocampal plasticity, and cortical connectivity [1][2]. The CBLN family consists of four members (CBLN1-4), with CBLN2 being widely expressed in both cerebellar and extra-cerebellar regions. CBLN2 functions as a synaptogenic molecule, promoting the formation of excitatory synapses by bridging presynaptic neurexins with postsynaptic glutamate receptors [3]. Dysregulation of CBLN2 has been implicated in neurodevelopmental disorders, particularly autism spectrum disorder (ASD), and in neurodegenerative conditions affecting cerebellar function.
Structure
CBLN2 possesses the conserved cerebellin domain characteristic of the CBLN family:
Signal Peptide: N-terminal secretory signal sequence for extracellular targeting
Dimerization Capacity: Forms homodimers and heterodimers with other CBLN family members
Post-translational Modifications: Contains potential N-glycosylation sites for extracellular stability
The three-dimensional structure reveals a beta-sheet rich fold that enables CBLN2 to function as a synaptic adhesion molecule, bridging presynaptic and postsynaptic membranes [4].
Normal Function
Synaptogenesis
CBLN2 is a potent synaptogenic molecule that promotes excitatory synapse formation:
Presynaptic Organization: Binds to presynaptic neurexin-1 isoforms to induce presynaptic differentiation
Postsynaptic Targeting: Recruits postsynaptic density proteins and glutamate receptors to synaptic sites
Synapse Maintenance: Contributes to long-term stability of established synapses