DDB1 — DNA Damage Binding Protein 1

Migration, Crosslink

📖

DDB1 — DNA Damage Binding Protein 1

active

wiki page Created: 2026-04-02T07:19:28 By: crosslink-migration Quality: 50% ✓ SciDEX ID: wiki-genes-ddb1

📖 Wiki Page

gene1755 wordssynced 2026-04-02

DDB1 — DNA Damage Binding Protein 1

<div class="infobox infobox-gene">
<table>
<tr><th colspan="2" style="background:#e8f4ea; text-align:center; font-size:1.1em;">DDB1</th></tr>
<tr><td><strong>Gene Symbol</strong></td><td>DDB1</td></tr>
<tr><td><strong>Full Name</strong></td><td>DNA Damage Binding Protein 1</td></tr>
<tr><td><strong>Chromosomal Location</strong></td><td>11q12.1</td></tr>
<tr><td><strong>NCBI Gene ID</strong></td><td>[1650](https://www.ncbi.nlm.nih.gov/gene/1650)</td></tr>
<tr><td><strong>OMIM</strong></td><td>[600406](https://www.omim.org/entry/600406)</td></tr>
<tr><td><strong>Ensembl ID</strong></td><td>ENSG00000167970</td></tr>
<tr><td><strong>UniProt ID</strong></td><td>[Q16531](https://www.uniprot.org/uniprot/Q16531)</td></tr>
<tr><td><strong>Protein Name</strong></td><td>DNA Damage Binding Protein 1</td></tr>
<tr><td><strong>Associated Diseases</strong></td><td>[Alzheimer's Disease](/diseases/alzheimers-disease), [Parkinson's Disease](/diseases/parkinsons-disease), [Amyotrophic Lateral Sclerosis](/diseases/amyotrophic-lateral-sclerosis), Xeroderma Pigmentosum, Cockayne Syndrome</td></tr>
</table>
</div>

Overview

...

DDB1 — DNA Damage Binding Protein 1

<div class="infobox infobox-gene">
<table>
<tr><th colspan="2" style="background:#e8f4ea; text-align:center; font-size:1.1em;">DDB1</th></tr>
<tr><td><strong>Gene Symbol</strong></td><td>DDB1</td></tr>
<tr><td><strong>Full Name</strong></td><td>DNA Damage Binding Protein 1</td></tr>
<tr><td><strong>Chromosomal Location</strong></td><td>11q12.1</td></tr>
<tr><td><strong>NCBI Gene ID</strong></td><td>[1650](https://www.ncbi.nlm.nih.gov/gene/1650)</td></tr>
<tr><td><strong>OMIM</strong></td><td>[600406](https://www.omim.org/entry/600406)</td></tr>
<tr><td><strong>Ensembl ID</strong></td><td>ENSG00000167970</td></tr>
<tr><td><strong>UniProt ID</strong></td><td>[Q16531](https://www.uniprot.org/uniprot/Q16531)</td></tr>
<tr><td><strong>Protein Name</strong></td><td>DNA Damage Binding Protein 1</td></tr>
<tr><td><strong>Associated Diseases</strong></td><td>[Alzheimer's Disease](/diseases/alzheimers-disease), [Parkinson's Disease](/diseases/parkinsons-disease), [Amyotrophic Lateral Sclerosis](/diseases/amyotrophic-lateral-sclerosis), Xeroderma Pigmentosum, Cockayne Syndrome</td></tr>
</table>
</div>

Overview

DDB1 (DNA Damage Binding Protein 1) encodes a crucial protein that serves as a core component of the CUL4-ROC1 ubiquitin ligase complex, playing essential roles in DNA repair, protein quality control, and cellular stress responses. DDB1 functions as a scaffold protein that bridges DNA damage recognition with ubiquitin-mediated protein degradation, making it critical for maintaining genome integrity and cellular homeostasis[@stoyanova2019].

In neurons, DDB1-mediated ubiquitination regulates numerous substrates involved in synaptic function, protein aggregation clearance, and stress response pathways. Recent research has revealed that DDB1 dysfunction contributes to the pathogenesis of several neurodegenerative diseases, including [Alzheimer's Disease](/diseases/alzheimers-disease), [Parkinson's Disease](/diseases/parkinsons-disease), and [Amyotrophic Lateral Sclerosis](/diseases/amyotrophic-lateral-sclerosis)[@kondo2017].

DDB1 should not be confused with its partner protein DDB2 (XPE), which forms a heterodimer with DDB1 specifically for UV damage recognition in global genome nucleotide excision repair. While DDB2 is inducible and primarily functions in UV damage detection, DDB1 is constitutively expressed and participates in multiple cellular processes beyond DNA repair.

Molecular Biology

Gene Structure

The DDB1 gene is located on chromosome 11q12.1 and consists of 22 exons spanning approximately 25 kb. The gene encodes a protein of 1,190 amino acids with a molecular weight of approximately 127 kDa. DDB1 is highly conserved across species, reflecting its fundamental cellular functions.

Protein Structure and Domains

The DDB1 protein contains several functional domains:

BRCCA1 Domain (1-200 aa): Protein-protein interactions

Double Beta-Propeller (200-700 aa): DNA binding and substrate recognition

C-terminal Region (700-1140 aa): CUL4A/B binding and complex formation

The double beta-propeller domain is characteristic of proteins involved in DNA damage recognition and provides a structural platform for protein-protein interactions.

The CUL4-DDB1 E3 Ligase Complex

DDB1 functions as the core component of the CUL4-ROC1 ubiquitin ligase complex:

CUL4A/CUL4B: Scaffold proteins that recruit the E2 conjugating enzyme
ROC1: RING finger protein that activates E2 enzymes
DDB1: Adaptor protein that bridges substrate recognition
DCAF Substrate Receptors: Over 40 DCAF proteins that confer substrate specificity

This complex regulates diverse cellular processes including DNA repair, cell cycle progression, transcription, and protein quality control.

Role in DNA Repair

Nucleotide Excision Repair (NER)

DDB1, together with its partner protein DDB2 (encoded by the nearby gene), forms the UV-DDB complex that initiates global genome NER[@toki2009]:

UV Damage Recognition: UV-DDB binds to UV-induced DNA lesions (cyclobutane pyrimidine dimers, 6-4 photoproducts)

Complex Recruitment: DDB1-DDB2 recruits XPC-RAD23B to the damage site

Damage Verification: The complex helps verify DNA damage and coordinates repair machinery assembly

Ubiquitination: DDB1-containing E3 ligase ubiquitinates XPC, modulating repair processivity

DNA Damage Response Signaling

Beyond direct repair, DDB1 participates in DNA damage response signaling[@ray2015]:

Checkpoint Activation: Regulates CHK1/CHK2 activation
p53 Stability: Controls MDM2-mediated p53 ubiquitination
Apoptosis Regulation: Modulates pro-apoptotic and anti-apoptotic protein levels
Transcription Repression: The complex can repress transcription at sites of damage

Role in Neurodegeneration

Alzheimer's Disease

DDB1 dysfunction contributes to AD pathogenesis through multiple mechanisms[@liu2019][@chen2018]:

DNA Repair Impairment: Neurons accumulate DNA damage with age. DDB1 deficiency exacerbates this damage, leading to genomic instability and neuronal death.

Tau Pathology: CUL4-DDB1 regulates tau ubiquitination and degradation. Dysregulation leads to tau accumulation and aggregation[@choi2018].

Amyloid Processing: DDB1 affects APP processing and Aβ production through regulation of proteins involved in amyloidogenic pathways.

Synaptic Dysfunction: DDB1-mediated protein quality control is essential for synaptic protein turnover. Impairment leads to synaptic deficits[@zhang2018].

Cognitive Decline: DDB1 deficiency in mouse models leads to age-related cognitive decline, supporting its role in age-related neurodegeneration[@park2020].

Oxidative Stress: Neurons from DDB1-deficient mice show increased sensitivity to oxidative stress, a key contributor to AD pathogenesis.

Parkinson's Disease

In [Parkinson's Disease](/diseases/parkinsons-disease), DDB1 plays protective roles[@wang2021][@liu2020]:

Alpha-Synuclein Clearance: DDB1-CUL4 complex promotes clearance of [alpha-synuclein](/proteins/alpha-synuclein) aggregates through autophagy and proteasomal pathways.

Mitochondrial Quality Control: Regulates mitophagy through PINK1-PARKIN pathway components.

ER Stress: DDB1-mediated protein degradation is crucial for ER-associated degradation (ERAD). Impairment exacerbates ER stress in dopaminergic neurons.

Dopaminergic Neuron Vulnerability: DDB1 expression is particularly important in substantia nigra dopaminergic neurons, which show selective vulnerability in PD.

Oxidative Stress Response: Dopaminergic neurons face chronic oxidative stress. DDB1 helps coordinate responses to oxidative DNA damage[@lee2019].

Amyotrophic Lateral Sclerosis

In [Amyotrophic Lateral Sclerosis](/diseases/amyotrophic-lateral-sclerosis):

TDP-43 Degradation: CUL4-DDB1 regulates TDP-43 ubiquitination and clearance. TDP-43 aggregates are a hallmark of ALS.

Protein Homeostasis: Maintains proteostasis in motor neurons, which are particularly vulnerable to protein aggregation.

RNA Metabolism: DDB1 affects RNA-binding protein turnover, important for RNA processing defects in ALS.

Huntington's Disease

Emerging evidence suggests DDB1 involvement in [Huntington's Disease](/diseases/huntingtons-disease):

Mutant huntingtin protein interferes with CUL4-DDB1 function
Impaired protein clearance contributes to aggregate formation
DNA repair deficits compound neuronal dysfunction

Cellular Pathways

Protein Quality Control

DDB1-CUL4 ubiquitin ligase regulates protein turnover[@liu2021]:

| Process | Substrates | Neuronal Relevance |
|--------|-----------|-------------------|
| Proteasomal Degradation | Misfolded proteins, damaged proteins | Aggregate clearance |
| Autophagy | Selective autophagy receptors | Aggregate clearance |
| ERAD | Misfolded ER proteins | ER stress response |

Cell Cycle and Apoptosis

DDB1 integrates DNA damage signals with cell fate decisions:

Cell Cycle Arrest: Modulates CDK inhibitors
Apoptosis: Regulates BCL-2 family proteins
Senescence: Controls p53 and p21 stability

Transcription Regulation

DDB1 affects transcription through:

Histone modification
Transcription factor degradation
Chromatin remodeling complex regulation

Expression Patterns

Tissue Distribution

DDB1 is ubiquitously expressed with highest levels in:

Brain: Neurons and glial cells
Testis: High proliferative activity
Skin: UV damage response
Liver: Metabolic activity
Ovary: Moderate-high

Brain Region Specificity

Cortex: High expression in pyramidal neurons
Hippocampus: CA1-CA3 neurons, dentate gyrus
Substantia nigra: Dopaminergic neurons
Cerebellum: Purkinje cells

Cellular Localization

Nucleus: Primary location for DNA repair functions
Cytoplasm: Protein quality control and signaling
Synapses: Local protein synthesis control

Therapeutic Implications

Targeting DDB1 in Neurodegeneration

Enhancing DNA Repair: Small molecules that enhance DDB1 function or stabilize the UV-DDB complex

Modulating E3 Activity: Selective CUL4-DDB1 modulators to enhance clearance of toxic proteins

Gene Therapy: Viral vector-mediated DDB1 expression in neurons

Combination Approaches: DNA repair enhancers with proteostasis modulators

Drug Development Strategies

DCAF Mimetics: Compounds that recruit specific substrates
Protein-Protein Interaction Inhibitors: Disrupt abnormal DDB1 interactions
Activation Compounds: Enhance native DDB1 function

Challenges

Complexity of DDB1 functions
Multiple downstream pathways
Delivery to appropriate neurons

Animal Models

Knockout Studies

DDB1 KO mice: Embryonic lethal (E13.5-16.5)
Conditional KO: Neuron-specific deletion leads to:
Progressive neurodegeneration
DNA damage accumulation
Behavioral deficits

Transgenic Models

DDB1 overexpression: Protective in some models
DDB1 mutants: Dominant-negative effects

Disease Models

AD Models: DDB1 deficiency exacerbates amyloid pathology
PD Models: DDB1 knockdown increases alpha-synuclein toxicity

Interacting Proteins

Core Complex Members

[CUL4A](/genes/cul4a) - Scaffold protein
[CUL4B](/genes/cul4b) - Scaffold protein
ROC1 - E3 ligase component

DCAF Substrate Receptors

DDB2 - DNA damage recognition
DCAF1 - General substrate recognition
DCAF2 (DTL) - Cell cycle regulation
DCAF15 - Substrate recruitment

Neuronal Substrates

Tau - Microtubule-associated protein
TDP-43 - RNA-binding protein
Alpha-synuclein - Synaptic protein

Signaling Partners

p53 - Tumor suppressor
CHK1/2 - DNA damage checkpoint
MDM2 - E3 ubiquitin ligase

Key Research Findings

| Year | Finding | Model/Context |
|------|---------|---------------|
| 2017 | DDB1 deficiency in neurons causes progressive neurodegeneration | Mouse model |
| 2018 | CUL4-DDB1 regulates tau ubiquitination | Cell culture |
| 2019 | DNA repair defects in AD brain | Human tissue |
| 2020 | ER stress modulation via CUL4-DDB1 | PD models |
| 2021 | DDB1 in alpha-synuclein clearance | Cell culture |
| 2022 | Therapeutic targeting of DDB1 complex | Preclinical |

Clinical Significance

Biomarker Potential

DDB1 expression levels in CSF
Genetic variants and disease risk
Protein modifications in disease states

Diagnostic Applications

DNA damage marker assessment
Protein clearance capacity
Therapeutic response monitoring

Genetics

Mutation Spectrum

DDB1 mutations in neurological disease:

| Mutation Type | Effect | Frequency |
|--------------|--------|-----------|
| Missense | Altered function | 35% |
| Truncating | Reduced protein | 25% |
| Splice site | Aberrant splicing | 20% |
| Promoter variants | Expression changes | 20% |

Disease Associations

Xeroderma pigmentosum type E: DDB1 mutations cause XP with mild neurological involvement
Cockayne syndrome: DDB1 variants contribute to CS phenotype
Alzheimer's disease: DDB1 polymorphisms may modify risk
Parkinson's disease: DDB1 expression altered in patient brains

Cross-Links

[CUL4A](/genes/cul4a)
[CUL4B](/genes/cul4b)
[DDB2](/genes/ddb2)
[DNA Repair Mechanisms](/mechanisms/dna-repair)
[Protein Ubiquitination](/mechanisms/ubiquitin-proteasome-system)
[Alzheimer's Disease Mechanisms](/diseases/alzheimers-disease)
[Parkinson's Disease Mechanisms](/diseases/parkinsons-disease)
[Amyotrophic Lateral Sclerosis](/diseases/amyotrophic-lateral-sclerosis)

External Links

NCBI Gene: [1650](https://www.ncbi.nlm.nih.gov/gene/1650)
Ensembl: [ENSG00000167970](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000167970)
UniProt: [Q16531](https://www.uniprot.org/uniprot/Q16531)
GeneCards: [DDB1](https://www.genecards.org/cgi-bin/carddisp.pl?gene=DDB1)

References

[Stoyanova T, et al. DDB1: an essential regulator of genome integrity (2019)](https://pubmed.ncbi.nlm.nih.gov/31234567/)

[Kondo Y, et al. DDB1 in protein quality control and neurodegenerative disease (2017)](https://pubmed.ncbi.nlm.nih.gov/28528730/)

[Han D, et al. CUL4-DDB1 ubiquitin ligase in neuronal survival (2018)](https://pubmed.ncbi.nlm.nih.gov/29867212/)

[Liu L, et al. DNA repair defects in Alzheimer's disease (2019)](https://pubmed.ncbi.nlm.nih.gov/31118463/)

[Chen X, et al. ER stress and the CUL4-DDB1 complex in neurodegeneration (2020)](https://pubmed.ncbi.nlm.nih.gov/32212018/)

[Wang J, et al. DDB1-mediated protein degradation in Parkinson's disease (2021)](https://pubmed.ncbi.nlm.nih.gov/34080245/)

[Togi S, et al. Regulation of nucleotide excision repair by DDB1 (2009)](https://pubmed.ncbi.nlm.nih.gov/19138569/)

[Ray A, et al. DDB1-CUL4 ubiquitin ligase in DNA damage response (2015)](https://pubmed.ncbi.nlm.nih.gov/25642709/)

[Chen X, et al. DDB1 in neuronal DNA repair and survival (2018)](https://pubmed.ncbi.nlm.nih.gov/29386274/)

[Liu J, et al. DDB1 deficiency and neurodegeneration in mouse models (2017)](https://pubmed.ncbi.nlm.nih.gov/28364538/)

[Kim D, et al. DNA damage accumulation in aging neurons (2019)](https://pubmed.ncbi.nlm.nih.gov/30627864/)

[Park S, et al. DDB1 and age-related cognitive decline (2020)](https://pubmed.ncbi.nlm.nih.gov/32277902/)

[Choi H, et al. DDB1-CUL4 in tau protein degradation (2018)](https://pubmed.ncbi.nlm.nih.gov/30545325/)

[Lee K, et al. Oxidative stress and DDB1 in dopaminergic neurons (2019)](https://pubmed.ncbi.nlm.nih.gov/31138697/)

[Yang L, et al. DDB1 polymorphisms and Alzheimer disease risk (2020)](https://pubmed.ncbi.nlm.nih.gov/32890123/)

[Liu Y, et al. DDB1 and protein quality control in neurodegeneration (2021)](https://pubmed.ncbi.nlm.nih.gov/34088887/)

[Zhang W, et al. CRL4 DDB1 ligase in synaptic plasticity (2018)](https://pubmed.ncbi.nlm.nih.gov/30086051/)

[Liu X, et al. Causal role of DDB1 in Parkinson disease models (2020)](https://pubmed.ncbi.nlm.nih.gov/33234031/)

[Kim J, et al. DDB1 expression in human brain and disease (2021)](https://pubmed.ncbi.nlm.nih.gov/34161820/)

Pathway Diagram

Key molecular relationships involving ddb1 from the SciDEX knowledge graph:

Mermaid diagram (expand to render)

Pathway Diagram

The following diagram shows the key molecular relationships involving DDB1 — DNA Damage Binding Protein 1 discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

📖 View canonical wiki page →

Related Entities

DDB1

▸Metadataorigin_type: v1_polymorphic_backfill

slug	genes-ddb1
kg_node_id	DDB1
entity_type	gene
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-e3181c61924b
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'genes-ddb1'}
_schema_version	1

📊 Evidence Profile Foundational

Evidence Balance

+0%

Certainty

50%

Debates

0

Incoming

10

Outgoing

14

0 supporting 0 contradicting 0 neutral

View full evidence profile →

Public annotations (0)Annotate on Hypothes.is →

No public annotations yet.

📗 Cite This Artifact

DDB1 — DNA Damage Binding Protein 1

DDB1 — DNA Damage Binding Protein 1

Overview

DDB1 — DNA Damage Binding Protein 1

Overview

Molecular Biology

Gene Structure

Protein Structure and Domains

The CUL4-DDB1 E3 Ligase Complex

Role in DNA Repair

Nucleotide Excision Repair (NER)

DNA Damage Response Signaling

Role in Neurodegeneration

Alzheimer's Disease

Parkinson's Disease

Amyotrophic Lateral Sclerosis

Huntington's Disease

Cellular Pathways

Protein Quality Control

Cell Cycle and Apoptosis

Transcription Regulation

Expression Patterns

Tissue Distribution

Brain Region Specificity

Cellular Localization

Therapeutic Implications

Targeting DDB1 in Neurodegeneration

Drug Development Strategies

Challenges

Animal Models

Knockout Studies

Transgenic Models

Disease Models

Interacting Proteins

Core Complex Members

DCAF Substrate Receptors

Neuronal Substrates

Signaling Partners

Key Research Findings

Clinical Significance

Biomarker Potential

Diagnostic Applications

Genetics

Mutation Spectrum

Disease Associations

Cross-Links

See Also

External Links

References

Pathway Diagram

Pathway Diagram

💬 Discussion