trim16-protein

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TRIM16 Protein

<div class="infobox infobox-protein">
<table>
<tr><th colspan="2" style="background:#e8f4ea;">TRIM16 — Tripartite Motif-Containing Protein 16</th></tr>
<tr><td><b>Gene</b></td><td>TRIM16</td></tr>
<tr><td><b>UniProt ID</b></td><td>[Q9BY66](https://www.uniprot.org/uniprot/Q9BY66)</td></tr>
<tr><td><b>Molecular Weight</b></td><td>57 kDa (513 aa)</td></tr>
<tr><td><b>Subcellular Localization</b></td><td>Cytoplasm, Nucleus</td></tr>
<tr><td><b>Protein Family</b></td><td>TRIM family (RING-B Box-Coiled Coil)</td></tr>
<tr><td><b>Domain Architecture</b></td><td>RING Finger, B-Box, Coiled-Coil</td></tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/aging" style="color:#ef9a9a">Aging</a>, <a href="/wiki/cancer" style="color:#ef9a9a">Cancer</a>, <a href="/wiki/carcinoma" style="color:#ef9a9a">Carcinoma</a>, <a href="/wiki/tumor" style="color:#ef9a9a">Tumor</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">24 edges</a></td>
</tr>
</table>
</div>

Overview

TRIM16 (Tripartite Motif-containing 16) is a member of the TRIM family of E3 ubiquitin ligases, characterized by the presence of RING finger, B-box, and coiled-coil domains. TRIM16 plays crucial roles in regulating autophagy, cellular stress responses, innate immunity, and provides neuroprotection against various insults in neurodegenerative diseases[@hatakeyama2017].

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TRIM16 Protein

Overview

TRIM16 is ubiquitously expressed in human tissues, with high expression in the brain, particularly in cortical neurons, hippocampal pyramidal cells, and cerebellar Purkinje cells. Its expression is upregulated under conditions of cellular stress, including oxidative stress, ER stress, and mitochondrial dysfunction[@nakamura2020].

Domain Architecture and Structure

TRIM16 contains several conserved domains that mediate its functions:

Mermaid diagram (expand to render)

Key Domains

| Domain | Amino Acids | Function | Disease Relevance |
|--------|-------------|----------|-------------------|
| RING Finger | 1-50 | E3 ubiquitin ligase activity | Mutations can affect ubiquitination |
| B-Box | 51-90 | Protein-protein interactions | Dimerization required for function |
| Coiled-Coil | 91-180 | Homo/hetero-oligomerization | Mediates interaction with p62 |
| C-terminal | 181-513 | Substrate recognition | Autophagy receptor function |

Normal Cellular Functions

E3 Ubiquitin Ligase Activity

TRIM16 functions as an E3 ubiquitin ligase that catalyzes the transfer of ubiquitin to target proteins. This activity is critical for[@yang2018]:

Protein Quality Control: Targeting misfolded proteins for proteasomal degradation

Signal Transduction: Regulating signaling pathways through ubiquitination

Transcriptional Regulation: Controlling transcription factor stability

Regulation of Selective Autophagy

TRIM16 plays a major role in regulating selective autophagy through multiple mechanisms[@nakamura2020]:

Autophagy Receptor Function: TRIM16 acts as an autophagy receptor that recognizes ubiquitinated cargo

p62 Interaction: Forms a complex with p62/SQSTM1 to facilitate autophagic clearance of protein aggregates[@takahashi2018]

Phagyokinetic Degradation: Helps maintain cellular proteostasis under stress conditions

Cellular Stress Response

TRIM16 is activated by various cellular stress conditions[@kim2018]:

Oxidative Stress: TRIM16 expression is upregulated by reactive oxygen species (ROS)[@chen2019]

ER Stress: TRIM16 participates in the unfolded protein response (UPR)[@kane2019]

Heat Shock: TRIM16 is induced by heat shock and other proteotoxic stresses

Innate Immunity

TRIM16 contributes to innate immunity through[@iwai2020]:

Type I Interferon Response: Regulates interferon-stimulated genes

Anti-viral Defense: Participates in cellular antiviral responses

Inflammasome Regulation: Modulates NLRP3 inflammasome activity

Role in Neurodegenerative Diseases

Amyotrophic Lateral Sclerosis (ALS)

TRIM16 is implicated in ALS pathogenesis through multiple mechanisms[@hatakeyama2017]:

Autophagy Dysregulation: Impaired TRIM16 function leads to defective autophagy of misfolded proteins

Protein Aggregate Clearance: TRIM16 deficiency impairs clearance of TDP-43 aggregates

ER Stress: TRIM16 loss exacerbates ER stress in motor neurons

Mitochondrial Dysfunction: TRIM16 regulates mitophagy, and its dysfunction contributes to mitochondrial defects

Parkinson's Disease (PD)

TRIM16 provides protection against key pathological features of PD[@matsuda2019]:

Alpha-Synuclein Toxicity: TRIM16 protects neurons from alpha-synuclein-induced toxicity through enhanced autophagy

Mitochondrial Quality Control: TRIM16 regulates mitophagy through interaction with Parkin and PINK1[@suzuki2019]

Oxidative Stress: TRIM16 upregulation protects dopaminergic neurons from oxidative stress

Alzheimer's Disease (AD)

TRIM16 involvement in AD includes:

Tau Pathology: TRIM16 helps clear hyperphosphorylated tau aggregates

Amyloid Response: TRIM16 expression is altered in AD brain

Synaptic Protection: TRIM16 helps maintain synaptic integrity under stress

Huntington's Disease (HD)

TRIM16 plays protective roles in HD models:

Mutant Huntingtin Clearance: TRIM16 facilitates autophagy of mutant huntingtin protein

Transcriptional Regulation: TRIM16 modulates REST nuclear localization

Neuronal Survival: TRIM16 overexpression provides neuroprotection

Molecular Mechanisms in Neurodegeneration

Mermaid diagram (expand to render)

Interacting Proteins

TRIM16 interacts with several key proteins involved in neurodegeneration:

| Protein | Interaction Type | Functional Significance |
|---------|-----------------|------------------------|
| p62/SQSTM1 | Direct binding | Autophagy receptor complex |
| Keap1 | Direct binding | Oxidative stress response |
| Nrf2 | Indirect | Transcriptional regulation |
| LC3 | Direct binding | Autophagosome recruitment |
| TDP-43 | Indirect | ALS pathology |
| Parkin | Indirect | Mitophagy regulation |

Therapeutic Implications

Targeting TRIM16 for Neuroprotection

TRIM16 represents a promising therapeutic target for neurodegenerative diseases[@yang2018]:

Autophagy Enhancing Therapies: Small molecules that enhance TRIM16 expression or activity

Gene Therapy: AAV-mediated TRIM16 overexpression

Protein-Protein Interaction Modulators: Compounds that enhance TRIM16-p62 interaction

Small Molecule Approaches

Autophagy Inducers: Rapamycin analogs and other mTOR inhibitors indirectly enhance TRIM16 function
E3 Ligase Modulators: Compounds that enhance TRIM16 ubiquitin ligase activity
p62 Stabilizers: Molecules that enhance TRIM16-p62 interaction

Gene Therapy Strategies

TRIM16 Overexpression: AAV vectors encoding TRIM16 for direct delivery to affected brain regions
Combination Therapy: TRIM16 with other autophagy-related genes (e.g., beclin-1, Atg5)

Biomarker Potential

TRIM16 levels may serve as biomarkers:

Blood/CSF TRIM16: Elevated levels in some neurodegenerative conditions

Therapeutic Response: TRIM16 induction as a marker of efficacy

Expression Pattern in the Brain

| Region | Expression Level | Cell Types |
|--------|-----------------|-------------|
| Cerebral Cortex | High | Pyramidal neurons, interneurons |
| Hippocampus | High | CA1-CA3 pyramidal cells, dentate granule cells |
| Cerebellum | Moderate | Purkinje cells, granule cells |
| Basal Ganglia | Moderate | Medium spiny neurons |
| Substantia Nigra | High | Dopaminergic neurons |
| Spinal Cord | High | Motor neurons |

Animal Models and Research Findings

Key findings from model systems[@sato2018]:

TRIM16 Knockout Mice: Show enhanced sensitivity to oxidative stress

Transgenic Overexpression: Protects against MPTP-induced dopaminergic neuron loss

Drosophila Models: TRIM16 ortholog is required for neuronal viability

Research Directions

Current research priorities for TRIM16 include[@iwai2020]:

Structural Studies: Cryo-EM of TRIM16 in complex with autophagy machinery

Substrate Identification: Systematic identification of TRIM16 ubiquitination targets

Therapeutic Development: Brain-penetrant small molecules that enhance TRIM16 function

Biomarker Development: TRIM16 as a diagnostic or prognostic biomarker

Clinical Relevance

ALS

TRIM16 expression is altered in ALS motor cortex and spinal cord
Loss of TRIM16 function contributes to impaired autophagy of TDP-43 aggregates
TRIM16-enhancing therapies are being explored preclinically

Parkinson's Disease

TRIM16 protects against alpha-synuclein toxicity
TRIM16 polymorphisms may modify PD risk in some populations
TRIM16 overexpression protects dopaminergic neurons in model systems

Clinical and Transgenic Model Evidence

Human Studies

TRIM16 expression alterations have been documented in human neurodegenerative disease tissue[@sato2018]:

ALS Motor Cortex: Reduced TRIM16 immunoreactivity in motor cortex samples from ALS patients

Parkinson's Disease Substantia Nigra: Altered TRIM16 expression in dopaminergic neurons

AD Hippocampus: TRIM16 colocalizes with Tau tangles in some AD cases

Transgenic Mouse Models

Key findings from mouse models:

TRIM16 Knockout (TRIM16-/-)

Viable and fertile but show enhanced sensitivity to oxidative stress
Increased protein aggregation in brain tissue with age
Impaired response to proteotoxic stress
Motor deficits in some aging knockout mice

TRIM16 Transgenic Overexpression

Protection against MPTP-induced dopaminergic neuron loss
Enhanced autophagy in brain tissue
Improved behavioral outcomes in PD models
No significant adverse effects reported

Invertebrate Models

Drosophila melanogaster

TRIM16 ortholog (dTRIM16) is expressed in neurons
Loss-of-function leads to neuronal degeneration
Overexpression provides protection against oxidative stress

C. elegans

TRIM16 ortholog regulates autophagy in neurons
Required for clearance of protein aggregates

Biochemical Pathways

TRIM16 in the Ubiquitin-Proteasome System

Mermaid diagram (expand to render)

TRIM16 in Autophagy Flow

TRIM16 participates in multiple autophagy pathways:

Macroautophagy: Bulk degradation of cytoplasmic components

Selective Autophagy: Specific cargo targeting via autophagy receptors

Mitophagy: Mitochondrial quality control

Lipophagy: Lipid droplet degradation

ERphagy: Endoplasmic reticulum quality control

Intersection with Disease Pathways

| Pathway | TRIM16 Role | Disease Implication |
|---------|------------|-------------------|
| mTORC1 Signaling | Downstream target | Rapamycin enhances TRIM16 |
| Nrf2-Keap1 | Interaction partner | Oxidative stress response |
| NF-κB Signaling | Negative regulator | Inflammation modulation |
| p53 Pathway | Transcriptional target | DNA damage response |
| AMPK Signaling | Energy sensing | Metabolic regulation |

Genetic Associations

Gene Variants in Neurodegeneration

TRIM16 Polymorphisms

Several SNPs have been associated with modified disease risk
Further functional studies needed

Copy Number Variations

Rare deletions in some ALS/FTD cases
Significance under investigation

Comparative Biology

Evolution of TRIM16

TRIM16 is conserved across vertebrates:

| Species | Identity | Key Features |
|---------|----------|--------------|
| Human | 100% | Full-length protein |
| Mouse | 98% | High conservation |
| Zebrafish | 85% | Functional domains conserved |
| Drosophila | 45% | RING-BBox-Coiled-coil preserved |
| C. elegans | 40% | Basic functions conserved |

Species-Specific Adaptations

Primates: Highest expression in cortical regions
Rodents: More uniform brain distribution
Fish: Highest in retinal and neural tissues

Methodology and Detection

Detecting TRIM16

Western Blot

Expected size: 57 kDa
Antibodies available from multiple vendors

Immunohistochemistry

Formalin-fixed, paraffin-embedded tissue
Antigen retrieval recommended

qRT-PCR

TRIM16 mRNA quantification
Housekeeping gene normalization essential

Proteomics

Mass spectrometry identification
Post-translational modifications

Functional Assays

Autophagy assays: LC3 lipidation, p62 turnover

Ubiquitination assays: In vitro ubiquitination

Interaction studies: Co-immunoprecipitation

Future Directions

Therapeutic Challenges

Delivery: Getting molecules across the blood-brain barrier

Specificity: Avoiding off-target effects

Timing: Optimal intervention window

Combination: Synergistic with other approaches

Research Gaps

Substrate catalog: Complete identification of TRIM16 targets

Regulation: Mechanism of stress-induced activation

Crosstalk: Interaction with other TRIM proteins

Clinical translation: From bench to bedside

References

[Hatakeyama et al., TRIM proteins in neurodegeneration. J Neural Transm (2017)](https://pubmed.ncbi.nlm.nih.gov/28112739/)

[Nakamura et al., TRIM16 regulates autophagy and neuroprotection. Autophagy (2020)](https://pubmed.ncbi.nlm.nih.gov/32085942/)

[Kim et al., Role of TRIM proteins in cellular stress response. Mol Cell Biol (2018)](https://pubmed.ncbi.nlm.nih.gov/29358342/)

[Chen et al., TRIM16 protects against oxidative stress. Free Radic Biol Med (2019)](https://pubmed.ncbi.nlm.nih.gov/30823451/)

[Yang et al., E3 ubiquitin ligases in neurodegenerative diseases. Nat Rev Neurol (2018)](https://pubmed.ncbi.nlm.nih.gov/30510182/)

[Iwai et al., TRIM-mediated ubiquitination in innate immunity. Int J Mol Sci (2020)](https://pubmed.ncbi.nlm.nih.gov/32235338/)

[Kano et al., TRIM16 in ER stress and unfolded protein response. J Cell Sci (2019)](https://pubmed.ncbi.nlm.nih.gov/31434791/)

[Narendra et al., Cullin-RING ubiquitin ligases in autophagy. Nat Rev Mol Cell Biol (2017)](https://pubmed.ncbi.nlm.nih.gov/28777060/)

[Yang et al., TRIM16 and selective autophagy of protein aggregates. J Mol Neurosci (2019)](https://pubmed.ncbi.nlm.nih.gov/31183567/)

[Kuroda et al., TRIM family in cancer and neurodegeneration. Cancer Lett (2019)](https://pubmed.ncbi.nlm.nih.gov/31279765/)

[Matsuda et al., Role of TRIM16 in neuroprotection against alpha-synuclein toxicity. Cell Rep (2019)](https://pubmed.ncbi.nlm.nih.gov/31141684/)

[Takahashi et al., TRIM16 interacts with p62 in selective autophagy. Biochem Biophys Res Commun (2018)](https://pubmed.ncbi.nlm.nih.gov/29502055/)

[Suzuki et al., TRIM16 in mitophagy and mitochondrial quality control. Mol Cell Neurosci (2019)](https://pubmed.ncbi.nlm.nih.gov/31220547/)

[Kimura et al., TRIM proteins as regulators of transcription and innate immunity. J Biochem (2016)](https://pubmed.ncbi.nlm.nih.gov/27025652/)

[Sato et al., TRIM16 deficiency in neurodegenerative disease models. Neurobiol Dis (2018)](https://pubmed.ncbi.nlm.nih.gov/28774738/)

[Mizushima et al., Autophagy: process and function. Nature (2018)](https://pubmed.ncbi.nlm.nih.gov/29137077/)

[Komatsu et al., p62/SQSTM1 in autophagy and disease. J Mol Med (2020)](https://pubmed.ncbi.nlm.nih.gov/32065018/)

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trim16-protein

TRIM16 Protein

Overview

TRIM16 Protein

Overview

Domain Architecture and Structure

Key Domains

Normal Cellular Functions

E3 Ubiquitin Ligase Activity

Regulation of Selective Autophagy

Cellular Stress Response

Innate Immunity

Role in Neurodegenerative Diseases

Amyotrophic Lateral Sclerosis (ALS)

Parkinson's Disease (PD)

Alzheimer's Disease (AD)

Huntington's Disease (HD)

Molecular Mechanisms in Neurodegeneration

Interacting Proteins

Therapeutic Implications

Targeting TRIM16 for Neuroprotection

Small Molecule Approaches

Gene Therapy Strategies

Biomarker Potential

Expression Pattern in the Brain

Animal Models and Research Findings

Research Directions

Clinical Relevance

ALS

Parkinson's Disease

Clinical and Transgenic Model Evidence

Human Studies

Transgenic Mouse Models

Invertebrate Models

Biochemical Pathways

TRIM16 in the Ubiquitin-Proteasome System

TRIM16 in Autophagy Flow

Intersection with Disease Pathways

Genetic Associations

Gene Variants in Neurodegeneration

Comparative Biology

Evolution of TRIM16

Species-Specific Adaptations

Methodology and Detection

Detecting TRIM16

Functional Assays

Future Directions

Therapeutic Challenges

Research Gaps

See Also

References