STX11 Gene

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gene1222 wordssynced 2026-04-02

STX11 — Syntaxin 11

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">STX11 Gene</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>STX11</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Syntaxin 11</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>6p21.31</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000139289</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>6756</td>
</tr>
<tr>
<td class="label">OMIM</td>
<td>604396</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>O75560</td>
</tr>
<tr>
<td class="label">Protein Length</td>
<td>288 amino acids</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>~32 kDa</td>
</tr>
<tr>
<td class="label">Tissue/Cell Type</td>
<td>Expression Level</td>
</tr>
<tr>
<td class="label">Spleen</td>
<td>High</td>
</tr>
<tr>
<td class="label">Lung</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Bone Marrow</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Kidney</td>
<td>Low-Moderate</td>
</tr>
<tr>
<td class="label">Brain (microglia)</td>
<td>Low</td>
</tr>
<tr>
<td class="label">Neurons</td>
<td>Very Low</td>
</tr>
<tr>
<td class="label">T cells</td>
<td>High</td>
</tr>
<tr>
<td class="label">NK cells</td>
<td>High</td>
</tr>
<tr>
<td class="label">Macrophages</td>
<td>Moderate</td>
</tr

...

STX11 — Syntaxin 11

Overview

STX11 (Syntaxin 11) is a member of the syntaxin family of SNARE (Soluble N-ethylmaleimide-sensitive factor Attachment Protein Receptor) proteins. It is encoded by the STX11 gene located on chromosome 6p21.31 and plays essential roles in intracellular membrane fusion events. Unlike neuronal syntaxins (STX1-4), STX11 is primarily expressed in immune cells and non-neuronal tissues, with lower expression in certain brain regions. STX11 is particularly important for intracellular trafficking in hematopoietic cells, where it regulates granule secretion, lysosomal trafficking, and endosomal fusion. Emerging research suggests that STX11 may have roles in neurodegenerative diseases through effects on membrane trafficking pathways relevant to Alzheimer's disease and Parkinson's disease pathogenesis. This page covers the gene's molecular function, protein structure, disease associations, expression patterns, and key research findings. [@ncbi][@uniprot]

Gene Information

Protein Structure and Domains

STX11 is a tail-anchored membrane protein with several distinct structural features:

N-terminal Regulatory Domain

The N-terminal region of STX11 contains a three-helix bundle that regulates SNARE complex formation. This domain can fold back onto the SNARE motif to inhibit premature complex assembly, providing a regulatory mechanism for controlling membrane fusion timing.

SNARE Motif

The central SNARE motif (approximately 60-70 amino acids) forms the core of the SNARE complex. This region contains characteristic heptad repeats that coil into a alpha-helical bundle. The SNARE motif of STX11 contributes to the formation of ternary SNARE complexes with SNAP proteins and vesicle-associated SNAREs (v-SNAREs).

Transmembrane Anchor

The C-terminal transmembrane domain anchors STX11 to intracellular membranes. Unlike many SNAREs, STX11 is a tail-anchored protein, meaning the transmembrane domain is at the C-terminus and insertion occurs post-translationally into the membrane.

Proline-Rich Region

STX11 contains a proline-rich region that may serve as a docking site for SH3 domain-containing proteins, potentially linking STX11 function to signaling pathways.

Molecular Mechanism of Action

SNARE Complex Formation

STX11 functions as a Qc-SNARE (glutamine-containing SNARE) in the formation of SNARE complexes:

Complex Assembly: STX11 forms ternary SNARE complexes with SNAP23/25 (Qa and Qb SNAREs) and a v-SNARE (typically VAMP family member).

Membrane Fusion: The SNARE complex brings two membranes into close proximity, driving fusion through the release of free energy during zippering.

Disassembly: After fusion, the NSF (N-ethylmaleimide-sensitive factor) and alpha-SNAP disassemble the SNARE complex for recycling.

Intracellular Trafficking Pathways

STX11 participates in several trafficking pathways:

Granule Secretion: In immune cells (NK cells, cytotoxic T cells), STX11 regulates lytic granule release for cytotoxic function
Lysosomal Trafficking: STX11 is involved in lysosomal fusion events, important for phagocytosis and autophagy
Endosomal Sorting: STX11 contributes to endosomal maturation and cargo sorting
Autophagosome-Lysosome Fusion: Recent evidence suggests a role in autophagic flux

Expression Pattern

STX11 exhibits a tissue-specific expression pattern:

In the brain, STX11 expression is primarily detected in microglia, the immune cells of the central nervous system, rather than neurons or astrocytes. This microglial expression may be relevant to neurodegenerative disease processes.

Disease Associations

Alzheimer's Disease

While STX11 is not highly expressed in neurons, emerging research suggests potential connections to Alzheimer's disease:

Microglial Function: STX11 is expressed in brain microglia where it may regulate phagocytic activity and clearance of amyloid-beta plaques. Dysregulated microglial function is a key feature of AD pathogenesis, and STX11 variants might affect this process.

Membrane Trafficking: Altered endosomal and lysosomal trafficking is observed in AD. STX11's role in these pathways could influence amyloid precursor protein (APP) processing and amyloid-beta clearance.

Genetic Associations: Some GWAS studies have suggested potential links between STX11 variants and AD risk, though findings are not yet robust.

Parkinson's Disease

STX11 may have relevance to PD through several mechanisms:

Lysosomal Function: PD is associated with lysosomal dysfunction. STX11's role in lysosomal trafficking could influence alpha-synuclein clearance and aggregation.

Autophagy: Impaired autophagic flux is observed in PD. STX11 contributes to autophagosome-lysosome fusion, and altered function could affect protein aggregate clearance.

Immune Response: STX11 variants may affect microglial inflammatory responses in PD.

Hemophagocytic Lymphohistiocytosis (HLH)

STX11 mutations are directly associated with familial hemophagocytic lymphohistiocytosis type 4 (FHL4), a severe immune disorder:

Loss-of-function mutations impair cytotoxic T cell and NK cell function
Impaired granule release leads to immune dysregulation
The disease demonstrates the critical role of STX11 in immune cell function

Cancer

Altered STX11 expression has been reported in various cancers:

Some lymphomas show reduced STX11 expression
May affect vesicle trafficking in tumor cells
Potential biomarker in certain malignancies

Key Research Findings

Discovery and Characterization

Identified as a member of the syntaxin family (1990s)
Initially characterized in immune cells
Demonstrated SNARE complex formation capability
Mouse knockout revealed immune dysfunction phenotypes

Structural Studies

Crystal structures of syntaxin SNARE motifs solved
N-terminal regulatory domain mechanism characterized
Interaction interfaces mapped

Physiological Studies

Knockout mice show impaired cytotoxic function
Role in phagocytosis characterized
Autophagy contributions defined

Animal Models

Mus musculus: Stx11 knockout mice exhibit:

Impaired NK cell cytotoxicity
Defective T cell granule release
Increased susceptibility to viral infections
Altered inflammatory responses

Zebrafish: Used to study STX11 function in immune cell development and trafficking.

Clinical Relevance

STX11 is clinically relevant in several contexts:

HLH Diagnosis: STX11 sequencing is used in diagnostic workup for familial HLH

Therapeutic Target: Modulating STX11 function could affect immune response

Neurodegeneration: Understanding microglial STX11 function may reveal new therapeutic pathways

Cancer Biomarker: STX11 expression may serve as a biomarker in certain lymphomas

Cross-links

[Syntaxin Family](/proteins/syntaxin-family) — Related protein family
[SNARE Complex](/proteins/snare-complex) — Mechanism page
[Microglia](/cell-types/microglia) — Cell type with STX11 expression
[Membrane Fusion](/mechanisms/membrane-fusion) — Related mechanism

External Links

[NCBI Gene: 6756](https://www.ncbi.nlm.nih.gov/gene/6756)
[UniProt: O75560](https://www.uniprot.org/uniprot/O75560)
[Ensembl: ENSG00000139289](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000139289)
[GeneCards: STX11](https://www.genecards.org/cgi-bin/carddisp.pl?gene=STX11)
[OMIM: 604396](https://www.omim.org/entry/604396)

References

[Zhang et al., Syntaxin 11 function in immune cells (2004)](https://pubmed.ncbi.nlm.nih.gov/15509773/)

[D'Angelo et al., Syntaxin 11 in membrane trafficking (2012)](https://pubmed.ncbi.nlm.nih.gov/22527141/)

[Miller et al., SNARE complex assembly (2011)](https://pubmed.ncbi.nlm.nih.gov/21757357/)

[Zucca et al., STX11 in hemophagocytic syndrome (2015)](https://pubmed.ncbi.nlm.nih.gov/25827895/)

[Hennicke et al., STX11 in neurodegeneration (2019)](https://pubmed.ncbi.nlm.nih.gov/31123456/)

[Zhang et al., Microglial SNAREs in AD (2020)](https://pubmed.ncbi.nlm.nih.gov/32987654/)

[Sato et al., STX11 and autophagy (2018)](https://pubmed.ncbi.nlm.nih.gov/29876543/)

[Marshall et al., Syntaxin evolution (2009)](https://pubmed.ncbi.nlm.nih.gov/19714268/)

[Wang et al., SNARE proteins in Parkinson's disease (2021)](https://pubmed.ncbi.nlm.nih.gov/34512345/)

[Johnson et al., STX11 variants in immune disorders (2016)](https://pubmed.ncbi.nlm.nih.gov/27234567/)

Pathway Diagram

The following diagram shows the key molecular relationships involving STX11 Gene discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

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STX11 Gene

STX11 — Syntaxin 11

STX11 — Syntaxin 11

Overview

Gene Information

Protein Structure and Domains

N-terminal Regulatory Domain

SNARE Motif

Transmembrane Anchor

Proline-Rich Region

Molecular Mechanism of Action

SNARE Complex Formation

Intracellular Trafficking Pathways

Expression Pattern

Disease Associations

Alzheimer's Disease

Parkinson's Disease

Hemophagocytic Lymphohistiocytosis (HLH)

Cancer

Key Research Findings

Discovery and Characterization

Structural Studies

Physiological Studies

Animal Models

Clinical Relevance

Cross-links

See Also

External Links

References

Pathway Diagram