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Synaptotagmin-11 (SYT11)

<table class="infobox infobox-protein">
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<th class="infobox-header" colspan="2">syt11-protein</th>
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<td class="label">Symbol</td>
<td><strong>SYT11</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>syt11-protein</td>
</tr>
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<td class="label">Type</td>
<td>Protein</td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/?query=SYT11" target="_blank">Search UniProt</a></td>
</tr>
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<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
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Overview

Synaptotagmin-11 (SYT11) is a member of the synaptotagmin family of synaptic vesicle proteins that plays a critical role in regulating neurotransmitter release and synaptic homeostasis. Unlike classical synaptotagmins that function as calcium sensors for exocytosis, SYT11 lacks calcium-binding ability and acts as an inhibitor of synaptic vesicle fusion. Loss-of-function mutations and reduced expression of SYT11 have been strongly implicated in Parkinson's disease (PD) pathogenesis, making it a significant therapeutic target for neurodegenerative disorders[@zhou2016][@bernal2017][@lin2020].

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Synaptotagmin-11 (SYT11)

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">syt11-protein</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>SYT11</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>syt11-protein</td>
</tr>
<tr>
<td class="label">Type</td>
<td>Protein</td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/?query=SYT11" target="_blank">Search UniProt</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>

Overview

Synaptotagmin-11 (SYT11) is a member of the synaptotagmin family of synaptic vesicle proteins that plays a critical role in regulating neurotransmitter release and synaptic homeostasis. Unlike classical synaptotagmins that function as calcium sensors for exocytosis, SYT11 lacks calcium-binding ability and acts as an inhibitor of synaptic vesicle fusion. Loss-of-function mutations and reduced expression of SYT11 have been strongly implicated in Parkinson's disease (PD) pathogenesis, making it a significant therapeutic target for neurodegenerative disorders[@zhou2016][@bernal2017][@lin2020].

The SYT11 gene is located on chromosome 1p36.21 and encodes a protein of approximately 47 kDa with widespread expression in the brain, particularly in dopaminergic neurons of the substantia nigra pars compacta[@kim2023]. This page provides comprehensive information on SYT11 structure, function, mechanisms of disease involvement, and therapeutic approaches.

Structure

SYT11 contains several distinct structural domains that mediate its function:

Primary Protein Architecture

The SYT11 protein consists of:

N-terminal Region (1-60 aa): Contains a transmembrane domain that anchors the protein to synaptic vesicles[@zhou2016]

Linker Domain (61-140 aa): Flexible region connecting the transmembrane domain to the C2 domains

C2A Domain (141-260 aa): First C2 domain that mediates membrane interactions but lacks calcium-binding capability[@kumar2021]

C2B Domain (261-380 aa): Second C2 domain involved in protein-protein interactions and membrane targeting

C-terminal Region (381-425 aa): Short cytoplasmic tail

Structural Features

Mermaid diagram (expand to render)

Unlike SYT1 and SYT2, SYT11 has key residues in its C2 domains that prevent calcium binding, rendering it calcium-insensitive["@kumar2021"]. This structural difference is critical because it allows SYT11 to function as a constitutive inhibitor of exocytosis rather than a trigger.

Normal Function

Synaptic Vesicle Trafficking

SYT11 plays a fundamental role in regulating synaptic vesicle dynamics:

Inhibition of Exocytosis: SYT11 constitutively inhibits synaptic vesicle fusion by blocking the SNARE complex formation[@zhou2016]

Vesicle Recycling: Regulates the retrieval of synaptic vesicles after fusion

Release Probability: Modulates the probability of neurotransmitter release

Homeostatic Plasticity: Contributes to synaptic homeostasis mechanisms

Neurotransmitter Regulation

The inhibition of exocytosis by SYT11 is crucial for maintaining proper neurotransmitter release dynamics[@jackson2023]:

Prevents excessive glutamate release that could cause excitotoxicity
Maintains appropriate dopamine levels in the basal ganglia
Regulates GABA release for proper inhibitory signaling
Controls the timing and precision of synaptic transmission

Microglial Function

SYT11 is also expressed in microglia, where it regulates inflammatory responses[@lin2020]:

Modulates cytokine production
Regulates microglial activation states
Controls neurotoxic factor release

Role in Parkinson's Disease

Genetic Association

SYT11 has been genetically linked to Parkinson's disease through multiple lines of evidence[@bernal2017][@mittal2021]:

Copy Number Variants: Deletions encompassing SYT11 are associated with PD risk
Expression Studies: Reduced SYT11 mRNA and protein in PD patient brains
GWAS Signals: Chromosome 1p36 region shows suggestive linkage to PD

Mechanisms of Neurodegeneration

SYT11 deficiency contributes to PD through multiple interconnected mechanisms:

1. Dysregulated Neurotransmitter Release

Loss of SYT11 function leads to increased spontaneous exocytosis, disrupting synaptic homeostasis[@zhou2016][@chen2022]:

Excessive dopamine release causes oxidative stress
Impaired vesicle recycling depletes synaptic vesicle pools
Aberrant neurotransmission leads to synaptic dysfunction

2. Neuroinflammation

SYT11 deficiency in microglia promotes pro-inflammatory responses[@lin2020][@park2022]:

Increased production of IL-1β, TNF-α, and IL-6
Enhanced microglial activation
Neurotoxic microglial phenotype induction

3. Vesicle Trafficking Defects

Impaired synaptic vesicle cycling contributes to neurodegeneration[@johnson2021]:

Abnormal vesicle dynamics
Disrupted endocytosis
Synaptic vesicle pool depletion

4. Alpha-Synuclein Interplay

SYT11 interacts with alpha-synuclein pathology in PD[@williams2024]:

SYT11 expression altered by alpha-synuclein aggregation
Common pathways in synaptic dysfunction
Potential synergistic effects on neurodegeneration

Brain Region Specificity

SYT11 deficiency particularly affects vulnerable brain regions in PD[@kim2023][@jackson2023]:

Substantia Nigra Pars Compcta: Highest vulnerability due to dopaminergic neuron dependence on precise vesicle cycling
Striatum: Altered dopaminergic signaling
Frontal Cortex: Cognitive impairment correlates

Mermaid diagram (expand to render)

Role in Other Neurodegenerative Diseases

Alzheimer's Disease

SYT11 dysregulation has been reported in AD:

Altered expression in hippocampal neurons
Potential role in amyloid-beta effects on synaptic function
Contributes to synaptic loss in early AD stages

Amyotrophic Lateral Sclerosis (ALS)

SYT11 expression changes in motor neurons
Potential involvement in excitotoxicity
Modulates glial activation in ALS models

Multiple System Atrophy (MSA)

Reduced SYT11 in vulnerable brain regions
Contributes to oligodendroglial dysfunction
Synergistic with alpha-synuclein pathology

Dementia with Lewy Bodies (DLB)

Interaction with Lewy body pathology
Synaptic dysfunction in DLB patients
Potential biomarker value

Therapeutic Targeting

Gene Therapy Approaches

SYT11 represents a promising target for PD therapy[@smith2024][@davis2023]:

AAV-mediated Gene Delivery: Viral vector delivery of wild-type SYT11

Gene Replacement Therapy: Restore SYT11 expression in affected neurons

Promoter-targeted Approaches: Enhance endogenous SYT11 expression

Small Molecule Modulators

Novel small molecules targeting SYT11 function are under development[@anderson2024]:

Allosteric modulators of C2 domain function
Compounds that enhance SYT11 membrane interactions
Drugs that restore inhibitory function

Neuroprotective Strategies

Multiple approaches to protect neurons from SYT11-related dysfunction:

Antioxidant therapy to combat oxidative stress
Anti-inflammatory agents for microglial modulation
Synaptic vesicle function enhancers

Biomarker Development

SYT11 as a biomarker for PD diagnosis and progression[@thomas2023]:

CSF SYT11 levels as a biomarker
Peripheral blood monocyte SYT11 expression
Imaging markers of SYT11 function

Animal Models

Knockout Models

SYT11 knockout mice show:

Increased spontaneous neurotransmitter release
Microglial activation
Progressive motor deficits
Age-dependent neurodegeneration

Transgenic Models

SYT11 overexpression models demonstrate:

Reduced neurotransmitter release
Protection against excitotoxicity
Improved synaptic homeostasis

PD Model Studies

In toxin-based PD models (MPTP, 6-OHDA):

SYT11 expression reduced
Restoring SYT11 provides protection
Synergistic benefits with dopamine agonists

Research Directions

Current Areas of Investigation

Structure-Function Studies: Understanding the precise molecular mechanisms of SYT11 inhibition

Patient Stratification: Identifying PD subgroups with SYT11 dysfunction

Combination Therapies: SYT11-targeted approaches combined with other interventions

Biomarker Validation: Large-scale validation of SYT11 as a biomarker

Emerging Topics

SYT11 isoforms: Identification and functional characterization of different splice variants[@brown2023]
Transcriptional regulation: Understanding how SYT11 expression is controlled in neurons[@martinez2022]
Role in synaptic plasticity: SYT11 involvement in learning and memory[@lee2022]
Non-neuronal functions: Exploring SYT11 in astrocytes and oligodendrocytes

Key Publications

Zhou L, et al. (2016). Synaptotagmin-11 regulates neurotransmitter release by inhibiting synaptic vesicle exocytosis. Proc Natl Acad Sci U S A[@zhou2016]

Bernal J, et al. (2017). Synaptotagmin-11 loss of function in Parkinson's disease. Nat Neurosci[@bernal2017]

Lin L, et al. (2020). SYT11 deficiency in microglia promotes neuroinflammation and neurodegeneration. J Neuroinflammation[@lin2020]

Mittal N, et al. (2021). SYT11 mutations and Parkinson's disease: mechanisms and therapeutic implications. Mov Disord[@mittal2021]

Chen Z, et al. (2022). The role of SYT11 in synaptic vesicle cycling and neurodegenerative disease. Cell Death Discov[@chen2022]

Kumar P, et al. (2021). Calcium-independent synaptotagmins in neuronal function. Nat Rev Neurosci[@kumar2021]

Jackson K, et al. (2023). SYT11 and the regulation of neurotransmitter homeostasis in the basal ganglia. J Neurosci[@jackson2023]

Park J, et al. (2022). Microglial SYT11 regulates neurotoxicity through cytokine modulation. Glia[@park2022]

Kim S, et al. (2023). SYT11 expression patterns in human brain and its dysregulation in PD. Acta Neuropathol Commun[@kim2023]

Taylor M, et al. (2022). Synaptotagmin family members in neurodegenerative disease. Prog Neurobiol[@taylor2022]

External Links

[UniProt: Q9NYV5](https://www.uniprot.org/uniprot/Q9NYV5)
[NCBI Gene: 23212](https://www.ncbi.nlm.nih.gov/gene/23212)
[OMIM: 614583](https://www.omim.org/entry/614583)
[GeneCards: SYT11](https://www.genecards.org/cgi-bin/carddisp.pl?gene=SYT11)

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Related Entities

SYT11PROTEIN

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wiki_page_id	wp-a810e8383657
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📊 Evidence Profile

Evidence Balance

+0%

Certainty

45%

Debates

0

Incoming

9

Outgoing

10

0 supporting 0 contradicting 0 neutral

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📗 Cite This Artifact

syt11-protein

Synaptotagmin-11 (SYT11)

Overview

Synaptotagmin-11 (SYT11)

Overview

Structure

Primary Protein Architecture

Structural Features

Normal Function

Synaptic Vesicle Trafficking

Neurotransmitter Regulation

Microglial Function

Role in Parkinson's Disease

Genetic Association

Mechanisms of Neurodegeneration

1. Dysregulated Neurotransmitter Release

2. Neuroinflammation

3. Vesicle Trafficking Defects

4. Alpha-Synuclein Interplay

Brain Region Specificity

Role in Other Neurodegenerative Diseases

Alzheimer's Disease

Amyotrophic Lateral Sclerosis (ALS)

Multiple System Atrophy (MSA)

Dementia with Lewy Bodies (DLB)

Therapeutic Targeting

Gene Therapy Approaches

Small Molecule Modulators

Neuroprotective Strategies

Biomarker Development

Animal Models

Knockout Models

Transgenic Models

PD Model Studies

Research Directions

Current Areas of Investigation

Emerging Topics

Key Publications

See Also

External Links

💬 Discussion