Complexin-2 Protein

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Complexin-2 Protein

Introduction

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">Complexin-2 Protein</th>
</tr>
<tr>
<td class="label">Protein Name</td>
<td>Complexin-2</td>
</tr>
<tr>
<td class="label">Gene</td>
<td>CPLX2</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>O75178</td>
</tr>
<tr>
<td class="label">PDB ID</td>
<td>1GID, 2N0P</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>14.5 kDa</td>
</tr>
<tr>
<td class="label">Subcellular Localization</td>
<td>Cytosolic (presynaptic terminal)</td>
</tr>
<tr>
<td class="label">Protein Family</td>
<td>Complexin family (CPLX1-4)</td>
</tr>
<tr>
<td class="label">Approach</td>
<td>Target</td>
</tr>
<tr>
<td class="label">Small molecule modulators</td>
<td>CPLX2-SNARE interaction</td>
</tr>
<tr>
<td class="label">Gene therapy</td>
<td>AAV-CPLX2 for neuroprotection</td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>

Complexin 2 Protein is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

Overview

...

Complexin-2 Protein

Introduction

Complexin 2 Protein is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

Overview

Mermaid diagram (expand to render)

Complexin-2 (CPLX2) is a 129-amino acid soluble protein that regulates synaptic vesicle fusion by binding to the SNARE complex. It modulates both spontaneous and evoked neurotransmitter release. [@giraud1998]

Protein Information

Structure

Complexin-2 contains:

N-terminal domain: Binds to assembled SNARE complexes
Central α-helical domain: The spine that interacts with SNARE bundle
C-terminal domain: Membrane attachment via hydrophobic interactions

Normal Function

Complexin-2 regulates neurotransmitter release:

SNARE Binding: Binds to assembled SNARE complexes
Release Modulation: Facilitates both spontaneous and evoked release
Fusion Clamp: Prevents premature fusion while vesicles are docked
Synaptic Plasticity: Regulates short-term plasticity (facilitation/depression)
Neuroprotection: Has neuroprotective roles in various models

Role in Disease

Alzheimer's Disease

CPLX2 levels reduced in [hippocampus](/brain-regions/hippocampus) in AD
Involved in [Aβ](/proteins/amyloid-beta)-induced synaptic dysfunction
May contribute to memory impairment

Parkinson's Disease

Altered SNARE regulation affects dopaminergic transmission
CPLX2 may protect against degeneration

Epilepsy

Mutations affect release probability and seizure threshold
CPLX2 dysregulation in epileptic tissue

Schizophrenia

CPLX2 expression altered in prefrontal [cortex](/brain-regions/cortex)
Associated deficits

Huntington with cognitive's Disease

Mutant [huntingtin](/proteins/huntingtin-protein) affects complexin function
Contributes to synaptic dysfunction

Therapeutic Targeting

Key Publications

Complexin structure and function - Nat Struct Biol (2001) - PMID: 11354656(https://pubmed.ncbi.nlm.nih.gov/11354656/)

CPLX2 in Alzheimer's disease - J Neurosci (2009) - PMID: 19244523(https://pubmed.ncbi.nlm.nih.gov/19244523/)

Complexin and synaptic plasticity - [Neuron](/entities/neurons) (2012) - PMID: 22958824(https://pubmed.ncbi.nlm.nih.gov/22958824/)

CPLX2 in Huntington's disease - Proc Natl Acad Sci (2014) - PMID: 25278599(https://pubmed.ncbi.nlm.nih.gov/25278599/)

Background

The study of Complexin 2 Protein has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.

Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.

Disease Associations

Complexin-2 has been implicated in several neurological conditions:

Alzheimer's Disease: CPLX2 levels are reduced in AD brains, correlating with cognitive decline. The protein plays a protective role against amyloid-beta-induced synaptic toxicity[@mcmahon1995].
Parkinson's Disease: Altered complexin-2 function affects dopaminergic synaptic vesicle release, contributing to motor deficits[@giraud1998].
Schizophrenia: CPLX2 expression is downregulated in schizophrenic brains, affecting inhibitory synapse function[@rosenmund2003].
Huntington's Disease: Mutant huntingtin disrupts complexin-2 function, impairing synaptic vesicle priming[@liu2019].

Therapeutic Implications

Targeting complexin-2 may offer therapeutic benefits:

Synaptic Stabilizers: Compounds that enhance complexin-2 function could protect against synaptic loss in neurodegeneration[@dhara2018].
Gene Therapy: AAV-mediated CPLX2 delivery shows promise in preclinical models[@bera2021].
SNARE Complex Modulators: Understanding complexin-SNARE interactions enables targeted drug development[@cho2010].

Research Directions

Current research areas include:

Structure-function studies of complexin domains
Development of small molecules targeting complexin-SNARE interactions
Investigation of complexin-1 vs complexin-2 functional differences
Role in asynchronous neurotransmitter release

Animal Models

CPLX2 Knockout Mice: Viable but show enhanced spontaneous release and impaired synchrony[@rizo2018].
Double KO (CPLX1/2): Severe deficits in synchronous release[^9].
Transgenic overexpression: Enhanced synaptic plasticity and memory[^10].

References

CPLX2 Ge- SNAP25 Protein
STX1A Protein
Synaptic Dysfunction Pathway

External Links

[UniProt: CPLX2](https- [GeneCards: C

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