FBXO7 Protein

FBXO7 Protein

title: FBXO7 Protein
.infobox .infobox-protein
{ [@gene]
float: right;
width: 300px;
padding: 10px;
background: #f8f9fa;
border: 1px solid #ddd;
border-radius: 4px;
margin: 10px;
}

.infobox .infobox-protein th
{
background: #28a745;
color: white;
padding: 8px;
}

.infobox .infobox-protein td
{
padding: 6px;
}

Introduction

FBXO7 (F-Box Protein 7) is a substrate recognition component of the SCF E3 ubiquitin ligase complex with important roles in mitochondrial quality control. This page covers the structure, function, and disease relevance of FBXO7 in neurodegenerative processes.

<div class="infobox infobox-protein">
|+ FBXO7 Protein
! Protein Name
| FBXO7 Protein
! Gene
| [FBXO7](/genes/fbxo7)
! UniProt ID
| [Q9Y238](https://www.uniprot.org/uniprot/Q9Y238)
! PDB IDs
| 5Y31, 5Y33
! Molecular Weight
| 52.2 kDa
! Subcellular Localization
| Cytoplasm; Mitochondria
! Protein Family
| F-box protein family (SCF complex)
</div>

Overview

FBXO7 is a member of the F-box protein family that serves as a substrate recognition component of the SCF (Skp1-Cul1-F-box) E3 ubiquitin ligase complex. The protein contains an N-terminal F-box domain that recruits the SCF complex, followed by a C-terminal substrate-binding region. FBXO7 plays critical roles in mitochondrial dynamics, mitophagy, and regulation of the PINK1-Parkin pathway.

Structure

...

FBXO7 Protein

title: FBXO7 Protein
.infobox .infobox-protein
{ [@gene]
float: right;
width: 300px;
padding: 10px;
background: #f8f9fa;
border: 1px solid #ddd;
border-radius: 4px;
margin: 10px;
}

.infobox .infobox-protein th
{
background: #28a745;
color: white;
padding: 8px;
}

.infobox .infobox-protein td
{
padding: 6px;
}

Introduction

FBXO7 (F-Box Protein 7) is a substrate recognition component of the SCF E3 ubiquitin ligase complex with important roles in mitochondrial quality control. This page covers the structure, function, and disease relevance of FBXO7 in neurodegenerative processes.

<div class="infobox infobox-protein">
|+ FBXO7 Protein
! Protein Name
| FBXO7 Protein
! Gene
| [FBXO7](/genes/fbxo7)
! UniProt ID
| [Q9Y238](https://www.uniprot.org/uniprot/Q9Y238)
! PDB IDs
| 5Y31, 5Y33
! Molecular Weight
| 52.2 kDa
! Subcellular Localization
| Cytoplasm; Mitochondria
! Protein Family
| F-box protein family (SCF complex)
</div>

Overview

FBXO7 is a member of the F-box protein family that serves as a substrate recognition component of the SCF (Skp1-Cul1-F-box) E3 ubiquitin ligase complex. The protein contains an N-terminal F-box domain that recruits the SCF complex, followed by a C-terminal substrate-binding region. FBXO7 plays critical roles in mitochondrial dynamics, mitophagy, and regulation of the PINK1-Parkin pathway.

Structure

FBXO7 contains an N-terminal F-box domain that recruits the SCF complex, followed by a C-terminal substrate-binding region. The protein can form homodimers and interacts with various partners through multiple domains.

Normal Function

FBXO7 is a substrate recognition component of the SCF (Skp1-Cul1-F-box) E3 ubiquitin ligase complex. It targets proteins for ubiquitination and degradation. FBXO7 plays roles in mitochondrial dynamics, mitophagy, and regulation of the PINK1-Parkin pathway. It also interacts with the transcription factor C/EBPβ.

Role in Disease

FBXO7 mutations cause PARK15 (parkinsonian-pyramidal syndrome), characterized by early-onset parkinsonism with pyramidal signs. FBXO7 deficiency impairs mitophagy, leading to accumulation of damaged mitochondria and neuronal death. The protein is also implicated in ALS and FTD.

Therapeutic Targeting

No specific therapies target FBXO7. Strategies to enhance mitophagy and mitochondrial function may be beneficial. Small molecules that activate the PINK1-Parkin pathway are being investigated. Gene therapy to restore FBXO7 function is in preclinical development.

See Also

• [Parkinson's Disease](/diseases/parkinsons-disease)
• [/mechanisms/mitophagy](/mechanisms/mitophagy)
• [/mechanisms/mitochondrial-dysfunction](/mechanisms/mitochondrial-dysfunction)
• [/entities/parkin-protein](/entities/parkin-protein)
• [/entities/pink1-protein](/entities/pink1-protein)
• [/genes/fbxo7](/genes/fbxo7)

Background

The study of Fbxo7 Protein has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.

Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.

External Links

• [PubMed](https://pubmed.ncbi.nlm.nih.gov/) - Biomedical literature
• [Alzheimer's Disease Neuroimaging Initiative](https://adni.loni.usc.edu/) - Research data
• [Allen Brain Atlas](https://brain-map.org/) - Brain gene expression data

FBXO7 in Cellular Pathways

Mitochondrial Function

FBXO7 plays a critical role in mitochondrial homeostasis:

Mitophagy Regulation

FBXO7 is essential for Parkin-independent mitophagy:

• Recruits cargo receptors to damaged mitochondria
• Interacts with LC3 through LIR domain
• Promotes ubiquitination of mitochondrial proteins

Mitochondrial Dynamics

• Regulates mitochondrial fission and fusion
• Maintains mitochondrial membrane potential
• Protects against mitochondrial ROS

Protein Quality Control

FBXO7 participates in ubiquitin-proteasome system:

Substrate Recognition

• Recognizes phosphorylated substrates
• Forms SCF Fbxo7 complex
• Transfers substrates to proteasome

Degradation Targets

| Target | Function | Disease Relevance |
|--------|----------|-------------------|
| Mcl-1 | Anti-apoptotic | Cancer, neuroprotection |
| TRAF6 | NF-κB signaling | Inflammation |
| PDR3 | Mitophagy | Mitochondrial quality |

FBXO7 and Neurodegeneration

Parkinson's Disease

PARK15 Link

Mutations in FBXO7 cause PARK15, a form of parkinsonism:

• Autosomal recessive inheritance
• Early onset (age 20-40)
• Parkinsonism with pyramidal features

Pathogenic Mechanisms

• Impaired mitophagy leads to accumulation of damaged mitochondria
• Altered protein homeostasis
• Increased oxidative stress
• Neuronal vulnerability

Other Neurodegenerative Diseases

Amyotrophic Lateral Sclerosis

• FBXO7 variants modify ALS risk
• Interaction with SOD1 aggregates
• Altered autophagy in motor neurons

Alzheimer's Disease

• FBXO7 expression altered in AD brain
• May affect amyloid processing
• Mitochondrial dysfunction contribution

Structure and Function

Protein Domains

FBXO7 contains several functional domains:

| Domain | Location | Function |
|--------|----------|----------|
| F-box | N-terminus | SCF complex recruitment |
| Ubiquitin-like | Central | Protein interactions |
| LIR | C-terminus | LC3 binding |

Post-Translational Modifications

FBXO7 is regulated by:

• Phosphorylation (multiple kinases)
• Ubiquitination (self-regulation)
• Sumoylation (nuclear-cytoplasmic shuttling)

Therapeutic Implications

Small Molecule Modulators

• FBXO7 activators: enhance mitophagy
• FBXO7 inhibitors: for cancer treatment

Gene Therapy Approaches

• AAV-FBXO7 delivery for PARK15
• CRISPR-based correction of mutations

Animal Models

Knockout Models

Fbxo7-/- mice show:

• Embryonic lethality
• Mitochondrial dysfunction
• Growth retardation

Knock-in Models

Park15 point mutation knock-in mice:

• Progressive motor deficits
• Mitochondrial abnormalities
• Protein inclusions

References

[@fbxo]: [FBXO7 and Parkinson's disease genetics](https://pubmed.ncbi.nlm.nih.gov/19585782/)
[@fbxoa]: [FBXO7 in mitophagy regulation](https://pubmed.ncbi.nlm.nih.gov/21499256/)
[@mitochondrial]: [Mitochondrial dysfunction in FBXO7 deficiency](https://pubmed.ncbi.nlm.nih.gov/25197062/)
[@fbxob]: [FBXO7 and protein quality control](https://pubmed.ncbi.nlm.nih.gov/253품8123/)
[@parkinindependent]: [Parkin-independent mitophagy pathways](https://pubmed.ncbi.nlm.nih.gov/25913853/)
[@fbxoc]: [FBXO7 mutations and parkinsonism](https://pubmed.ncbi.nlm.nih.gov/21531958/)
[@therapeutic]: [Therapeutic targeting of FBXO7](https://pubmed.ncbi.nlm.nih.gov/28933956/)
[@fbxod]: [FBXO7 animal models](https://pubmed.ncbi.nlm.nih.gov/30556691/)
[@fbxoe]: [FBXO7 in ALS pathogenesis](https://pubmed.ncbi.nlm.nih.gov/29678879/)
[@mitochondriala]: [Mitochondrial dynamics and neurodegeneration](https://pubmed.ncbi.nlm.nih.gov/30808632/)
[@scf]: [SCF complex biology and disease](https://pubmed.ncbi.nlm.nih.gov/29119938/)
[@autophagy]: [Autophagy in neurodegenerative disease](https://pubmed.ncbi.nlm.nih.gov/29298291/)
[@ubiquitinproteasome]: [Ubiquitin-proteasome system in PD](https://pubmed.ncbi.nlm.nih.gov/28658942/)
[@oxidative]: [ oxidative stress and neurodegeneration](https://pubmed.ncbi.nlm.nih.gov/28982465/)
[@gene]: [Gene therapy for parkinsonism](https://pubmed.ncbi.nlm.nih.gov/29761357/)