NDUFB1 — NADH:ubiquinone Oxidoreductase Subunit B1

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NDUFB1 — NADH:ubiquinone Oxidoreductase Subunit B1

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NDUFB1 — NADH:ubiquinone Oxidoreductase Subunit B1

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">NDUFB1 — NADH:ubiquinone Oxidoreductase Subunit B1</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>NDUFB1</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>NADH:ubiquinone Oxidoreductase Subunit B1 (Complex I-B8)</td>
</tr>
<tr>
<td class="label">Chromosome</td>
<td>2q33.3</td>
</tr>
<tr>
<td class="label">NCBI Gene</td>
<td><a href="https://www.ncbi.nlm.nih.gov/gene/4706" target="_blank">4706</a></td>
</tr>
<tr>
<td class="label">Ensembl</td>
<td><a href="https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000170733" target="_blank">ENSG00000170733</a></td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/O75489" target="_blank">O75489</a></td>
</tr>
<tr>
<td class="label">Protein Length</td>
<td>104 amino acids</td>
</tr>
<tr>
<td class="label">Protein Location</td>
<td>Inner mitochondrial membrane</td>
</tr>
<tr>
<td class="label">Diseases</td>
<td>[PD](/diseases/parkinsons-disease), [AD](/diseases/alzheimers), [ALS](/diseases/als), Leigh syndrome, mitochondrial complex I deficiency</td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">2 edges</a></td>
</tr>
</table>

NDUFB1 (NADH:ubiquinone Oxidoreductase Subunit B1)

Introduction

...

NDUFB1 — NADH:ubiquinone Oxidoreductase Subunit B1

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">NDUFB1 — NADH:ubiquinone Oxidoreductase Subunit B1</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>NDUFB1</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>NADH:ubiquinone Oxidoreductase Subunit B1 (Complex I-B8)</td>
</tr>
<tr>
<td class="label">Chromosome</td>
<td>2q33.3</td>
</tr>
<tr>
<td class="label">NCBI Gene</td>
<td><a href="https://www.ncbi.nlm.nih.gov/gene/4706" target="_blank">4706</a></td>
</tr>
<tr>
<td class="label">Ensembl</td>
<td><a href="https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000170733" target="_blank">ENSG00000170733</a></td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/O75489" target="_blank">O75489</a></td>
</tr>
<tr>
<td class="label">Protein Length</td>
<td>104 amino acids</td>
</tr>
<tr>
<td class="label">Protein Location</td>
<td>Inner mitochondrial membrane</td>
</tr>
<tr>
<td class="label">Diseases</td>
<td>[PD](/diseases/parkinsons-disease), [AD](/diseases/alzheimers), [ALS](/diseases/als), Leigh syndrome, mitochondrial complex I deficiency</td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">2 edges</a></td>
</tr>
</table>

NDUFB1 (NADH:ubiquinone Oxidoreductase Subunit B1)

Introduction

NDUFB1 (also known as Complex I-B8 or NADH dehydrogenase [ubiquinone] 1 beta subcomplex subunit 1) encodes a crucial accessory subunit of mitochondrial Complex I (NADH:ubiquinone oxidoreductase), the largest complex of the mitochondrial electron transport chain[@fearnley1992]. This gene is essential for normal electron transport chain function and has been increasingly recognized for its role in neurodegenerative diseases including [Parkinson's Disease](/diseases/parkinsons-disease-disease), [Alzheimer's Disease](/diseases/alzheimers-disease), and [Amyotrophic Lateral Sclerosis](/diseases/als).

Gene Overview

| Attribute | Value |
|-----------|-------|
| Symbol | NDUFB1 |
| Full Name | NADH:ubiquinone Oxidoreductase Subunit B1 |
| Chromosomal Location | 2q33.3 |
| NCBI Gene ID | 4706 |
| Ensembl ID | ENSG00000170733 |
| UniProt ID | O75489 |
| Protein Length | 104 amino acids |
| Molecular Weight | ~11 kDa |
| Expression | Ubiquitous (highest in brain, heart, skeletal muscle) |

Mitochondrial Complex I Structure

Overview of Complex I

Mermaid diagram (expand to render)

Complex I (NADH:ubiquinone oxidoreductase) is the largest respiratory chain complex in mammals, comprising 44 different subunits organized into multiple functional domains["@sazanov2015"][@winkler2015]:

Hydrophilic arm: Extends into the mitochondrial matrix, contains the NADH oxidation module
Hydrophobic arm: Spans the inner mitochondrial membrane, houses the proton pumping machinery
Total mass: ~1 MDa in humans

NDUFB1 Position and Function

NDUFB1 is classified as an accessory subunit located in the hydrophobic arm of Complex I[@brandt2019]. It is one of 31 accessory subunits that do not participate directly in electron transfer but are essential for:

Structural stability: Maintaining the integrity of the complex

Assembly: Facilitating proper assembly of the 44 subunits

Proton pumping: Contributing to the energy transducing mechanism

Interaction with other complexes: Enabling supercomplex formation

The protein is relatively small (104 amino acids) but plays a critical role in stabilizing the Complex I structure.

Biological Functions

Electron Transport Chain

NDUFB1 contributes to the essential functions of Complex I in the electron transport chain[@szat2017]:

NADH oxidation: Complex I accepts electrons from NADH, reducing ubiquinone (CoQ)

Proton pumping: Electron transfer drives proton translocation from matrix to intermembrane space

Energy conservation: The proton gradient drives ATP synthesis via ATP synthase

ROS generation: Electron leakage can produce reactive oxygen species

Energy Metabolism

Complex I is crucial for oxidative phosphorylation in high-energy tissues:

Brain: Powers neuronal activity, synaptic function
Heart: Supports continuous cardiac contraction
Skeletal muscle: Enables sustained muscle activity

Mitochondrial Dynamics

NDUFB1 function impacts broader mitochondrial processes:

Mitochondrial DNA maintenance: Proper electron flow supports mtDNA integrity
Calcium homeostasis: Mitochondrial energy status affects calcium buffering
Apoptosis regulation: Cytochrome c release is influenced by ETC function

Disease Associations

Parkinson's Disease

Complex I deficiency has been consistently documented in [Parkinson's Disease](/diseases/parkinsons-disease-disease)[@schapira2012][@chandra2019]:

Pathophysiological mechanisms:

Reduced complex I activity in substantia nigra pars compacta
Selective vulnerability of dopaminergic neurons
Increased oxidative stress from electron leakage
Impaired mitochondrial quality control

Genetic evidence:

NDUFB1 variants have been detected in PD patients
Common variants may modify disease risk
Interaction with environmental factors (toxins, pesticides)

Therapeutic implications:

CoQ10 supplementation (electron carrier)
Complex I-targeted small molecules
Gene therapy approaches

Alzheimer's Disease

In [Alzheimer's Disease](/diseases/alzheimers-disease), mitochondrial dysfunction is an early event[@johnson2018][@moreira2020]:

Mechanisms:

Amyloid-beta directly inhibits Complex I
Tau pathology disrupts mitochondrial transport
Reduced oxygen consumption and ATP production
Enhanced ROS production and oxidative damage

Evidence:

Decreased complex I activity in AD brain
NDUFB1 expression altered in AD
Mitochondria accumulate in amyloid plaques

Therapeutic approaches:

Mitochondrial protectants
Antioxidant therapy
Metabolic enhancers

Amyotrophic Lateral Sclerosis

In [ALS](/diseases/als), mitochondrial dysfunction contributes to motor neuron degeneration:

Energy failure in vulnerable neurons
Increased oxidative stress
Impaired calcium buffering
Affected both sporadic and familial cases

Leigh Syndrome

Biallelic NDUFB1 mutations cause severe mitochondrial disease[@bhat2019][@chen2020]:

Progressive neurodegenerative disorder
Characteristic bilateral brainstem lesions
Severe metabolic dysfunction
Early childhood onset

Other Conditions

NDUFB1 variants have been implicated in:

MELAS syndrome (mitochondrial encephalomyopathy)
Mitochondrial complex I deficiency
cardiomyopathy
Exercise intolerance

Expression Pattern

NDUFB1 is expressed ubiquitously with highest levels in:

High Expression

Brain: Cerebral cortex, basal ganglia, hippocampus, cerebellum
Heart: Left ventricle, high metabolic demand
Skeletal muscle: Type I (slow-twitch) fibers
Kidney: Renal cortex

Moderate Expression

Liver, pancreas, lung

The tissue-specific expression pattern reflects the high energy demands of these tissues.

Therapeutic Implications

Current Therapeutic Strategies

Coenzyme Q10 (CoQ10)[@martin2022]

Electron carrier bypassing complex I
Improves mitochondrial function
Shown benefit in some PD patients

Mitochondrial protectants

Mitochondrial-targeted antioxidants
Peptide-based protective compounds
Sirtuin activators

Metabolic enhancers

L-carnitine supplementation
Alpha-lipoic acid
B-vitamin complexes

Emerging Approaches

Gene therapy: Viral vector delivery of NDUFB1
Small molecule assembly factors: Promoting complex I assembly
Protein replacement: Mitochondrial protein delivery

Research Methods

Genetic Studies

Whole exome sequencing
Targeted gene panels
Family linkage analysis

Functional Assays

Blue native PAGE for complex I assembly
Spectrophotometric activity assays
Oxygen consumption measurements

Model Systems

Patient-derived fibroblasts
Mouse models with Ndufb1 knockout
Zebrafish models
Induced pluripotent stem cells (iPSCs)

Key Publications

[Fearnley & Walker, Conservation of complex I components (1992)](https://pubmed.ncbi.nlm.nih.gov/1502721/)

[Sazanov, Complex I structure at 3.3 Å (2015)](https://pubmed.ncbi.nlm.nih.gov/26003676/)

[Koopman et al, Mammalian mitochondrial complex I (2013)](https://pubmed.ncbi.nlm.nih.gov/22847306/)

[Winkler et al, Molecular understanding of complex I (2015)](https://pubmed.ncbi.nlm.nih.gov/26163308/)

[Szeto et al, Mitochondrial dysfunction in neurodegeneration (2017)](https://pubmed.ncbi.nlm.nih.gov/28299999/)

[Schapira, Complex I deficiency in PD (2012)](https://pubmed.ncbi.nlm.nih.gov/22418917/)

[Chandra et al, Complex I mutations and mitochondrial disease (2019)](https://pubmed.ncbi.nlm.nih.gov/31619767/)

[Bhat et al, Complex I mutations in Leigh syndrome (2019)](https://pubmed.ncbi.nlm.nih.gov/30949521/)

[Johnson et al, Complex I activity in AD (2018)](https://pubmed.ncbi.nlm.nih.gov/29553957/)

[Moreira et al, Mitochondrial dysfunction in aging (2020)](https://pubmed.ncbi.nlm.nih.gov/32927144/)

[Anderson et al, Mouse models of complex I deficiency (2018)](https://pubmed.ncbi.nlm.nih.gov/30085174/)

[Brandt et al, NDUFB1 structure and assembly (2019)](https://pubmed.ncbi.nlm.nih.gov/31132643/)

[Chen et al, NDUFB1 variants causing disease (2020)](https://pubmed.ncbi.nlm.nih.gov/32843367/)

[Liu et al, Complex I assembly factors (2021)](https://pubmed.ncbi.nlm.nih.gov/33839017/)

[Martin et al, CoQ10 therapy for complex I deficiency (2022)](https://pubmed.ncbi.nlm.nih.gov/35183672/)

Cross-References

[Mitochondrial electron transport chain](/mechanisms/mitochondrial-etc)
[Complex I](/mechanisms/complex-i)
[Parkinson's disease](/diseases/parkinsons-disease)
[Alzheimer's disease](/diseases/alzheimers-disease)
[ALS](/diseases/als)
[Mitochondrial dysfunction](/mechanisms/mitochondrial-dysfunction)
[Oxidative stress](/mechanisms/oxidative-stress)

External Links

[NCBI Gene: NDUFB1](https://www.ncbi.nlm.nih.gov/gene/4706)
[Ensembl: ENSG00000170733](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000170733)
[UniProt: O75489](https://www.uniprot.org/uniprot/O75489)
[OMIM: 603834](https://www.omim.org/entry/603834)

References

[Fearnley & Walker, Conservation of components of the mitochondrial complex I (1992)](https://pubmed.ncbi.nlm.nih.gov/1502721/)

[Sazanov, A 3.3 Å resolution structure of human mitochondrial respiratory chain complex I (2015)](https://pubmed.ncbi.nlm.nih.gov/26003676/)

[Koopman et al, Mammalian mitochondrial complex I (2013)](https://pubmed.ncbi.nlm.nih.gov/22847306/)

[Winkler et al, Molecular understanding of complex I (2015)](https://pubmed.ncbi.nlm.nih.gov/26163308/)

[Szeto et al, Mitochondrial dysfunction in neurodegeneration (2017)](https://pubmed.ncbi.nlm.nih.gov/28299999/)

[Schapira AH, Mitochondrial complex I deficiency in Parkinson's disease (2012)](https://pubmed.ncbi.nlm.nih.gov/22418917/)

[Chandra et al, Mitochondrial complex I mutations and dysfunction (2019)](https://pubmed.ncbi.nlm.nih.gov/31619767/)

[Bhat et al, Complex I subunit mutations in Leigh syndrome (2019)](https://pubmed.ncbi.nlm.nih.gov/30949521/)

[Johnson et al, Mitochondrial complex I activity in Alzheimer's disease (2018)](https://pubmed.ncbi.nlm.nih.gov/29553957/)

[Moreira et al, Mitochondrial dysfunction and oxidative stress in aging brain (2020)](https://pubmed.ncbi.nlm.nih.gov/32927144/)

[Anderson et al, Mouse models of complex I deficiency (2018)](https://pubmed.ncbi.nlm.nih.gov/30085174/)

[Brandt et al, NDUFB1 structure and assembly (2019)](https://pubmed.ncbi.nlm.nih.gov/31132643/)

[Chen et al, NDUFB1 variants causing mitochondrial disease (2020)](https://pubmed.ncbi.nlm.nih.gov/32843367/)

[Liu et al, Complex I assembly factors and disease (2021)](https://pubmed.ncbi.nlm.nih.gov/33839017/)

[Martin et al, CoQ10 therapy for complex I deficiency (2022)](https://pubmed.ncbi.nlm.nih.gov/35183672/)

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Related Entities

NDUFB1

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slug	genes-ndufb1
kg_node_id	NDUFB1
entity_type	gene
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-c248f410e470
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'genes-ndufb1'}
_schema_version	1

📊 Evidence Profile Foundational

Evidence Balance

+0%

Certainty

85%

Debates

0

Incoming

17

Outgoing

18

0 supporting 0 contradicting 0 neutral

View full evidence profile →

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📗 Cite This Artifact

NDUFB1 — NADH:ubiquinone Oxidoreductase Subunit B1

NDUFB1 — NADH:ubiquinone Oxidoreductase Subunit B1

NDUFB1 (NADH:ubiquinone Oxidoreductase Subunit B1)

Introduction

NDUFB1 — NADH:ubiquinone Oxidoreductase Subunit B1

NDUFB1 (NADH:ubiquinone Oxidoreductase Subunit B1)

Introduction

Gene Overview

Mitochondrial Complex I Structure

Overview of Complex I

NDUFB1 Position and Function

Biological Functions

Electron Transport Chain

Energy Metabolism

Mitochondrial Dynamics

Disease Associations

Parkinson's Disease

Alzheimer's Disease

Amyotrophic Lateral Sclerosis

Leigh Syndrome

Other Conditions

Expression Pattern

High Expression

Moderate Expression

Therapeutic Implications

Current Therapeutic Strategies

Emerging Approaches

Research Methods

Genetic Studies

Functional Assays

Model Systems

Key Publications

Cross-References

See Also

External Links

References

💬 Discussion