Syntaxin-1A Protein

Syntaxin-1A Protein

Introduction

Syntaxin 1A 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.

<div class="infobox infobox-protein"> [@sheng2020]
<div class="infobox-header">Syntaxin-1A</div> [@rizo2018]
<div class="infobox-row"><strong>Gene:</strong> [STX1A](/proteins/stx1a-protein)</div> [@giraud2021]
<div class="infobox-row"><strong>UniProt ID:</strong> [P61264](https://www.uniprot.org/uniprot/P61264)</div> [@zhou2022]
<div class="infobox-row"><strong>PDB ID:</strong> [3C98](https://www.rcsb.org/structure/3C98)</div>
<div class="infobox-row"><strong>Molecular Weight:</strong> ~35.6 kDa (288 amino acids)</div>
<div class="infobox-row"><strong>Subcellular Localization:</strong> Plasma membrane, synaptic vesicles</div>
<div class="infobox-row"><strong>Protein Family:</strong> SNARE family, Q-SNARE</div>
<div class="infobox-row"><strong>Associated Diseases:</strong> [Alzheimer's Disease](/diseases/alzheimers-disease), [Parkinson's Disease](/diseases/parkinsons-disease), [ALS](/diseases/amyotrophic-lateral-sclerosis), Diabetes, Synaptic disorders</div>
</div>

Overview

Syntaxin-1A Protein

Introduction

Syntaxin 1A 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.

<div class="infobox infobox-protein"> [@sheng2020]
<div class="infobox-header">Syntaxin-1A</div> [@rizo2018]
<div class="infobox-row"><strong>Gene:</strong> [STX1A](/proteins/stx1a-protein)</div> [@giraud2021]
<div class="infobox-row"><strong>UniProt ID:</strong> [P61264](https://www.uniprot.org/uniprot/P61264)</div> [@zhou2022]
<div class="infobox-row"><strong>PDB ID:</strong> [3C98](https://www.rcsb.org/structure/3C98)</div>
<div class="infobox-row"><strong>Molecular Weight:</strong> ~35.6 kDa (288 amino acids)</div>
<div class="infobox-row"><strong>Subcellular Localization:</strong> Plasma membrane, synaptic vesicles</div>
<div class="infobox-row"><strong>Protein Family:</strong> SNARE family, Q-SNARE</div>
<div class="infobox-row"><strong>Associated Diseases:</strong> [Alzheimer's Disease](/diseases/alzheimers-disease), [Parkinson's Disease](/diseases/parkinsons-disease), [ALS](/diseases/amyotrophic-lateral-sclerosis), Diabetes, Synaptic disorders</div>
</div>

Overview

Syntaxin-1A is a neuronal Q-SNARE (Soluble N-ethylmaleimide-sensitive factor Attachment Protein REceptor) protein essential for synaptic vesicle fusion and neurotransmitter release[@sutton1998]. Encoded by the STX1A gene, this 288-amino acid protein is a critical component of the SNARE complex that mediates rapid exocytosis at synapses. Syntaxin-1A interacts with multiple proteins including SNAP-25, VAMP2, and Munc18-1 to orchestrate synaptic transmission, making it a protein of significant interest in neurodegenerative disease research.

Structure

Syntaxin-1A has a characteristic SNARE domain structure:

Domain Organization

• N-terminal Habc domain (residues 1-154): Three-helix bundle, regulates SNARE assembly
• Linker region (residues 155-189): Flexible connection
• SNARE motif (residues 190-266): Forms core SNARE complex
• Transmembrane anchor (residues 267-288): C-terminal membrane insertion

Structural Features

• Four-helix bundle in Habc domain (Habc = helical domains A, B, C)
• Polymerizable SNARE motif
• Calcium-binding site (distinct from synaptotagmin)
• Multiple protein interaction domains

Normal Function

Synaptic Vesicle Fusion

• Forms ternary SNARE complex with SNAP-25 and VAMP2
• Mediates vesicle docking and priming
• Triggers rapid fusion pore opening
• Enables synchronous neurotransmitter release

Protein Interactions

Cellular Functions

• Regulates neurotransmitter release at excitatory and inhibitory synapses
• Controls synaptic vesicle pool size
• Modulates short-term plasticity
• Participates in endocytosis

Disease Involvement

Alzheimer's Disease

• Reduced expression in affected brain regions
• Dysregulation of SNARE complex assembly
• Effects on [Aβ](/proteins/amyloid-beta)-induced synaptic dysfunction
• Potential for therapeutic targeting

Parkinson's Disease

• Altered syntaxin-1A in PD brains
• Dopaminergic synapse dysfunction
• Potential role in LRRK2 pathogenesis
• Synaptic vesicle biology relevance

Amyotrophic Lateral Sclerosis (ALS)

• Motor neuron synaptic dysfunction
• SNARE complex alterations
• Excitotoxicity mechanisms
• Therapeutic targeting potential

Diabetes

• Syntaxin-1A regulates insulin secretion from pancreatic β-cells
• Implications for metabolic aspects of neurodegeneration

Therapeutic Implications

SNARE Complex Modulators

Research Strategies

• Enhancing SNARE complex stability
• Protecting against [Aβ](/proteins/amyloid-beta) toxicity
• Modulating synaptic vesicle dynamics
• Gene therapy approaches

Research Directions

See Also

• [Proteins Index](/proteins)
• [STX1A Gene](/proteins/stx1a-protein)
• [SNAP-25 Protein](/proteins/snap-25-protein)
• [VAMP2 Protein](/proteins/vamp2-protein)
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Parkinson's Disease](/diseases/parkinsons-disease)

External Links

• [UniProt: Syntaxin-1A](https://www.uniprot.org/uniprot/P61264)
• [PDB: Syntaxin-1A](https://www.rcsb.org/structure/3C98)
• [UniProt: STX1A](https://www.uniprot.org/uniprot/Q16623)

Background

The study of Syntaxin 1A 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.

References