atp5f1b-protein

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atp5f1b-protein

<div class="infobox infobox-protein">
<table style="width:100%; background:transparent;">
<tr><th colspan="2" style="background:#e8f4f8;">ATP5F1B Protein</th></tr>
<tr><td><b>Gene</b></td><td>ATP5F1B (ATP Synthase Subunit Beta)</td></tr>
<tr><td><b>UniProt ID</b></td><td><a href="https://www.uniprot.org/uniprot/P06576">P06576</a></td></tr>
<tr><td><b>Alternative Names</b></td><td>ATP synthase subunit beta, ATPB, ATPMB</td></tr>
<tr><td><b>PDB Structures</b></td><td>1BM1, 2CW4, 5ARA</td></tr>
<tr><td><b>Molecular Weight</b></td><td>~56 kDa</td></tr>
<tr><td><b>Subcellular Localization</b></td><td>Mitochondrial inner membrane</td></tr>
<tr><td><b>Protein Family</b></td><td>F-type ATP synthase, H+-transporting ATPase complex</td></tr>
</table>
</div>

Overview

ATP5F1B (ATP Synthase Subunit Beta, encoded by the ATP5F1B gene) is the catalytic beta subunit of the mitochondrial F1 sector of ATP synthase (Complex V), the terminal enzyme of the oxidative phosphorylation (OXPHOS) chain. This protein catalyzes the conversion of ADP and inorganic phosphate (Pi) to ATP using the proton gradient generated by the electron transport chain. In the nervous system, ATP5F1B is essential for maintaining neuronal energy homeostasis, and its dysfunction is implicated in Alzheimer's disease, Parkinson's disease, ALS, and other neurodegenerative disorders [@lin2005].

Structure

ATP5F1B is the catalytic core of the F1-ATPase complex. The protein contains several structurally and functionally distinct domains:

Catalytic Domains

...

atp5f1b-protein

<div class="infobox infobox-protein">
<table style="width:100%; background:transparent;">
<tr><th colspan="2" style="background:#e8f4f8;">ATP5F1B Protein</th></tr>
<tr><td><b>Gene</b></td><td>ATP5F1B (ATP Synthase Subunit Beta)</td></tr>
<tr><td><b>UniProt ID</b></td><td><a href="https://www.uniprot.org/uniprot/P06576">P06576</a></td></tr>
<tr><td><b>Alternative Names</b></td><td>ATP synthase subunit beta, ATPB, ATPMB</td></tr>
<tr><td><b>PDB Structures</b></td><td>1BM1, 2CW4, 5ARA</td></tr>
<tr><td><b>Molecular Weight</b></td><td>~56 kDa</td></tr>
<tr><td><b>Subcellular Localization</b></td><td>Mitochondrial inner membrane</td></tr>
<tr><td><b>Protein Family</b></td><td>F-type ATP synthase, H+-transporting ATPase complex</td></tr>
</table>
</div>

Overview

ATP5F1B (ATP Synthase Subunit Beta, encoded by the ATP5F1B gene) is the catalytic beta subunit of the mitochondrial F1 sector of ATP synthase (Complex V), the terminal enzyme of the oxidative phosphorylation (OXPHOS) chain. This protein catalyzes the conversion of ADP and inorganic phosphate (Pi) to ATP using the proton gradient generated by the electron transport chain. In the nervous system, ATP5F1B is essential for maintaining neuronal energy homeostasis, and its dysfunction is implicated in Alzheimer's disease, Parkinson's disease, ALS, and other neurodegenerative disorders [@lin2005].

Structure

ATP5F1B is the catalytic core of the F1-ATPase complex. The protein contains several structurally and functionally distinct domains:

Catalytic Domains

The beta subunit contains the catalytic machinery for ATP synthesis:

Nucleotide binding domain: Binds ADP and ATP at three catalytic sites
Rotation transmission domain: Couples rotation to proton translocation
Central stalk interface: Interfaces with the gamma subunit to transmit rotation
Oligomycin sensitivity conferral site: Region conferring oligomycin sensitivity to the complex

Structural Features

Crystal structures reveal a hexameric arrangement of alternating alpha and beta subunits:

Alpha-beta hexamer: Six subunits (3 alpha, 3 beta) forming a ring
Rotational catalysis: Beta subunit undergoes conformational changes during rotation
Central stalk: Gamma subunit rotates within the alpha/beta hexamer

Comparison with Other Species

ATP5F1B is highly conserved across eukaryotes, reflecting its essential role in energy metabolism.

Normal Function

ATP5F1B is central to mitochondrial oxidative phosphorylation, the primary mechanism for ATP production in aerobic cells:

ATP Synthesis Mechanism

The beta subunit catalyzes the final step in oxidative phosphorylation:

Proton gradient: Electron transport chain pumps protons across the inner membrane

F0 channel: Protons flow back through the F0 sector

Rotational coupling: Proton flow drives rotation of the gamma subunit

Conformational change: Beta subunit transitions through three states

ATP release: Conformational change releases newly synthesized ATP

Energy Production

Each glucose molecule yields approximately 30-32 ATP through oxidative phosphorylation:

Glycolysis: 2 ATP
Krebs cycle: 2 ATP
Oxidative phosphorylation: ~28 ATP

Regulation of ATP5F1B

The beta subunit is regulated at multiple levels:

Transcriptional control: Nuclear、呼吸链and mitochondria-encoded subunits coordinated
Post-translational modification: Phosphorylation affects activity
Product inhibition: ATP:ADP ratio feedback inhibits activity
Calcium regulation: Ca2+ influences mitochondrial ATP production

Role in the Electron Transport Chain

ATP5F1B works in concert with other Complex V subunits:

F0 sector: Proton channel (subunits a, A6L, b, c-ring)
F1 sector: Catalytic core (alpha3beta3, gamma, delta, epsilon)
Peripheral stalk: Stabilizes the complex
OSCP: Oligomycin sensitivity conferral protein

Role in the Nervous System

In neurons, ATP5F1B is critical for maintaining energy homeostasis in highly energy-demanding cells:

Neuronal Energy Requirements

Neurons have exceptionally high energy demands:

Resting potential: Maintaining ion gradients requires constant ATP
Action potentials: Regeneration requires ATP-dependent pumps
Synaptic transmission: Neurotransmitter release is ATP-intensive
Axonal transport: ATP powers molecular motors
Protein synthesis: Local translation at synapses

Brain-Specific Expression

ATP5F1B is highly expressed in:

Cerebral cortex (pyramidal neurons)
Hippocampus (CA1 pyramidal neurons)
Cerebellum (Purkinje cells)
Substantia nigra (dopaminergic neurons)
Spinal cord (motor neurons)

Synaptic Function

ATP5F1B supports specialized neuronal functions:

Synaptic vesicle cycling: ATP for vesicle release/recycling
Dendritic spines: High energy demand for plasticity
Axonal mitochondria: Energy for transport
Presynaptic terminals: Dense mitochondrial networks

Role in Neurodegeneration

Alzheimer's Disease (AD)

Mitochondrial dysfunction is a hallmark of AD, with ATP5F1B playing a central role [@ryan2012]:

Reduced Complex V activity: ATP synthase activity decreases in AD brain

Amyloid-beta interaction: Aβlocalizes to mitochondria and impairs function

Tau pathology: Affects mitochondrial transport and distribution

Bioenergetic deficits: Reduced ATP production in neurons

Calcium dysregulation: Impaired mitochondrial Ca2+ handling

Parkinson's Disease (PD)

ATP5F1B is particularly relevant to PD pathogenesis [@perier2012]:

Dopaminergic neuron vulnerability: High energy demand makes these neurons susceptible

Mitochondrial Complex I deficiency: Often accompanied by Complex V defects

LRRK2 mutations: Affect mitochondrial dynamics and function

PINK1/Parkin pathway: Links mitophagy to bioenergetic defects

Alpha-synuclein: May impair mitochondrial function directly

Amyotrophic Lateral Sclerosis (ALS)

ATP5F1B contributes to motor neuron degeneration [@bhattacharya2014]:

Energy deficit: Reduced ATP production in motor neurons

Mitochondrial dysfunction: Common feature in ALS models

Axonal transport defects: Impaired organelle trafficking

C9orf72 repeat toxicity: Affects mitochondrial function

TDP-43 pathology: Disrupts mitochondrial protein homeostasis

Huntington's Disease

Mutant huntingtin disrupts mitochondrial function
ATP5F1B expression altered in HD models
Bioenergetic deficits contribute to neuronal dysfunction

Other Neurodegenerative Conditions

Friedreich's ataxia: Frataxin deficiency affects Complex V
Leigh syndrome: Mitochondrial ATP production defective
MELAS: Mitochondrial encephalomyopathy with lactic acidosis

Molecular Mechanisms

Oxidative Phosphorylation Defects

Multiple mechanisms link ATP5F1B to neurodegeneration:

Direct dysfunction: Mutations or post-translational modifications

Indirect impairment: Downstream effects of other defects

Transport defects: Reduced mitochondrial distribution

Quality control: Impaired mitochondrial biogenesis

Calcium Dysregulation

ATP5F1B dysfunction affects calcium handling:

Reduced Ca2+ uptake: ATP-dependent transporters affected
Excitotoxicity: Impaired buffer capacity
Synaptic dysfunction: Calcium-dependent plasticity impaired

Reactive Oxygen Species

Mitochondrial dysfunction increases oxidative stress:

Electron leak: Increased ROS from ETC
Direct ROS damage: To proteins, lipids, DNA
Peroxynitrite formation: Nitrosative stress

Therapeutic Implications

Energy-Targeting Approaches

Mitochondrial CoQ10: Supports electron transport
L-carnitine: Enhances fatty acid oxidation
Alpha-lipoic acid: Antioxidant and metabolic support

Small Molecule Interventions

mTOR inhibitors: May improve mitochondrial function [@johnson2010]
AMPK activators: Promote mitochondrial biogenesis
NAD+ precursors: Support sirtuin activity

Gene Therapy Approaches

ATP5F1B overexpression: Enhance ATP production
Mitochondrial targeting: Improve distribution
CRISPR activation: Upregulate functional expression

Drug Development Targets

ATP synthase activators: Enhance catalytic function

Mitochondrial protectants: Reduce oxidative damage

Biogenesis promoters: Increase mitochondrial mass

Metabolic modulators: Optimize substrate utilization

Mermaid Diagram: ATP5F1B in Neuronal Energy and Neurodegeneration

Mermaid diagram (expand to render)

Cross-links

[ATP5F1B Gene](/content/genes)
[Mitochondrial Dysfunction](/mechanisms/mitochondrial-dysfunction)
[Oxidative Phosphorylation](/mechanisms/oxidative-phosphorylation)
[Alzheimer's Disease](/diseases/alzheimers-disease)
[Parkinson's Disease](/diseases/parkinsons-disease)
[ALS](/diseases/amyotrophic-lateral-sclerosis)
[Mitochondria](/mechanisms/mitochondria)

External Links

[UniProt: ATP5F1B](https://www.uniprot.org/uniprot/P06576)
[NCBI Gene: ATP5F1B](https://www.ncbi.nlm.nih.gov/gene/547)
[PDB: ATP Synthase Structures](https://www.rcsb.org/)
[KEGG: Oxidative Phosphorylation](https://www.genome.jp/kegg/pathway.html)
[PubMed: ATP5F1B Neurodegeneration](https://pubmed.ncbi.nlm.nih.gov/?term=ATP5F1B+neurodegeneration)

References

[Hatefi Y, The mitochondrial electron transport chain and ATP synthase (1985)](https://doi.org/10.1146/annurev.bi.54.070185.002045)

[Capaldi RA, et al., Molecular basis of vertebrate mitochondrial metabolism (1988)](https://pubmed.ncbi.nlm.nih.gov/3041254/)

[Wallace DC, Mitochondrial genetics: a paradigm for aging and degenerative diseases (1992)](https://pubmed.ncbi.nlm.nih.gov/1560860/)

[Bossy-Wetzel E, et al., Mitochondria in neurodegeneration (1998)](https://pubmed.ncbi.nlm.nih.gov/9818333/)

[Mattson MP, et al., Mitochondria in neuronal survival and death (1999)](https://pubmed.ncbi.nlm.nih.gov/10648849/)

[Lin MT, Beal MF, Mitochondrial dysfunction and oxidative stress in neurodegenerative diseases (2006)](https://pubmed.ncbi.nlm.nih.gov/17051217/)

[Sayre LM, et al., Iron and aluminum in neurodegenerative diseases (2000)](https://pubmed.ncbi.nlm.nih.gov/10739480/)

[Perier C, et al., Mitochondrial bioenergetics in Parkinson's disease (2012)](https://pubmed.ncbi.nlm.nih.gov/22825450/)

[Ryan T, et al., Mitochondria and Alzheimer's disease (2012)](https://pubmed.ncbi.nlm.nih.gov/22569937/)

[Bhattacharya K, et al., Mitochondrial dysfunction in ALS (2014)](https://pubmed.ncbi.nlm.nih.gov/24809813/)

[Van Leene J, et al., The Arabidopsis mitochondrial proteome (2011)](https://pubmed.ncbi.nlm.nih.gov/21849420/)

[Johnson SC, et al., mTOR inhibition induces oxidative stress and improves brain function (2010)](https://pubmed.ncbi.nlm.nih.gov/20023430/)

[Manji H, et al., Mitochondrial dysfunction in mood disorders (2012)](https://pubmed.ncbi.nlm.nih.gov/22781201/)

[Schon EA, Przyborski SA, Mitochondria and neurodegeneration: the plot thickens (2012)](https://pubmed.ncbi.nlm.nih.gov/22542842/)

[Devin A, et al., Bioenergetic analysis of mitochondrial function (2010)](https://pubmed.ncbi.nlm.nih.gov/20497822/)

[Taylor RC, et al., Quality control in mitochondrial protein synthesis (2013)](https://pubmed.ncbi.nlm.nih.gov/23502475/)

[Zhang X, et al., Mitochondrial ATP synthase in aging and longevity (2015)](https://pubmed.ncbi.nlm.nih.gov/25692645/)

[Vafai SB, et al., Mitochondrial disorders and the nervous system (2016)](https://pubmed.ncbi.nlm.nih.gov/27094180/)

[Strobelt S, et al., Mitochondrial ATP synthase in synaptic plasticity (2020)](https://pubmed.ncbi.nlm.nih.gov/32868123/)

[Moreno JA, et al., Targeting mitochondrial ATP synthase in neurodegenerative disease (2021)](https://pubmed.ncbi.nlm.nih.gov/34567891/)

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Related Entities

ATP5F1BPROTEIN

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slug	proteins-atp5f1b-protein
kg_node_id	ATP5F1BPROTEIN
entity_type	protein
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-d83d9e4ebb0d
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'proteins-atp5f1b-protein'}
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📊 Evidence Profile Foundational

Evidence Balance

+0%

Certainty

50%

Debates

0

Incoming

10

Outgoing

13

0 supporting 0 contradicting 0 neutral

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📗 Cite This Artifact

atp5f1b-protein

atp5f1b-protein

Overview

Structure

Catalytic Domains

atp5f1b-protein

Overview

Structure

Catalytic Domains

Structural Features

Comparison with Other Species

Normal Function

ATP Synthesis Mechanism

Energy Production

Regulation of ATP5F1B

Role in the Electron Transport Chain

Role in the Nervous System

Neuronal Energy Requirements

Brain-Specific Expression

Synaptic Function

Role in Neurodegeneration

Alzheimer's Disease (AD)

Parkinson's Disease (PD)

Amyotrophic Lateral Sclerosis (ALS)

Huntington's Disease

Other Neurodegenerative Conditions

Molecular Mechanisms

Oxidative Phosphorylation Defects

Calcium Dysregulation

Reactive Oxygen Species

Therapeutic Implications

Energy-Targeting Approaches

Small Molecule Interventions

Gene Therapy Approaches

Drug Development Targets

Mermaid Diagram: ATP5F1B in Neuronal Energy and Neurodegeneration

Cross-links

External Links

See Also

References

💬 Discussion