fer2

fer2

Overview

<div class="infobox infobox-gene">
<h3>FER2</h3>
<table>
<tr><th>Symbol</th><td>FER2</td></tr>
<tr><th>Full Name</th><td>Fer2-like Protein</td></tr>
<tr><th>Chromosomal Location</th><td>19p13.2</td></tr>
<tr><th>NCBI Gene ID</th><td>[27185](https://www.ncbi.nlm.nih.gov/gene/27185)</td></tr>
<tr><th>Ensembl ID</th><td>[ENSG00000140497](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000140497)</td></tr>
<tr><th>UniProt</th><td>[Q9NWD8](https://www.uniprot.org/uniprot/Q9NWD8)</td></tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>
</div>

FER2 (Fer2-like) encodes a mitochondrial protein belonging to the [ferredoxin](/proteins/ferredoxin) family of iron-sulfur (Fe-S) proteins. This small electron transfer protein is predominantly localized to [mitochondria](/entities/mitochondria) where it plays a critical role in [iron-sulfur cluster](/proteins/iron-sulfur-cluster) assembly and cellular respiration. The protein contains a highly conserved 2Fe-2S cluster binding domain and functions as an electron donor in various mitochondrial metabolic processes, including steroidogenesis, heme biosynthesis, and oxidative phosphorylation[@lill2012].

fer2

Overview

<div class="infobox infobox-gene">
<h3>FER2</h3>
<table>
<tr><th>Symbol</th><td>FER2</td></tr>
<tr><th>Full Name</th><td>Fer2-like Protein</td></tr>
<tr><th>Chromosomal Location</th><td>19p13.2</td></tr>
<tr><th>NCBI Gene ID</th><td>[27185](https://www.ncbi.nlm.nih.gov/gene/27185)</td></tr>
<tr><th>Ensembl ID</th><td>[ENSG00000140497](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000140497)</td></tr>
<tr><th>UniProt</th><td>[Q9NWD8](https://www.uniprot.org/uniprot/Q9NWD8)</td></tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>
</div>

FER2 (Fer2-like) encodes a mitochondrial protein belonging to the [ferredoxin](/proteins/ferredoxin) family of iron-sulfur (Fe-S) proteins. This small electron transfer protein is predominantly localized to [mitochondria](/entities/mitochondria) where it plays a critical role in [iron-sulfur cluster](/proteins/iron-sulfur-cluster) assembly and cellular respiration. The protein contains a highly conserved 2Fe-2S cluster binding domain and functions as an electron donor in various mitochondrial metabolic processes, including steroidogenesis, heme biosynthesis, and oxidative phosphorylation[@lill2012].

Iron-sulfur clusters are essential cofactors for numerous proteins involved in fundamental cellular processes, including mitochondrial electron transport chain complexes I-III, [aconitase](/proteins/aconitase) in the Krebs cycle, and DNA repair enzymes. The proper assembly and insertion of these clusters into apoproteins requires a complex network of scaffold, scaffold-like, and accessory proteins, among which ferredoxins serve as primary iron donors and electron carriers[@rouault2012].

Protein Structure and Function

Domain Architecture

FER2 is a small mitochondrial protein (approximately 120 amino acids) characterized by:

• N-terminal mitochondrial targeting sequence: A cleavable presequence that directs the protein to the mitochondrial matrix
• Conserved 2Fe-2S cluster binding domain: The signature region containing four conserved cysteine residues (Cys-X4-Cys-X2-Cys-X5-Cys motif) that ligate the [iron-sulfur cluster](/proteins/iron-sulfur-cluster)
• C-terminal acidic domain: A regionrich in acidic residues involved in protein-protein interactions

Biochemical Functions

FER2 participates in several critical mitochondrial biochemical pathways:

Related Proteins and Pathways

FER2 is part of a family of ferredoxin proteins that includes:

• FDX1 (Ferredoxin 1): Predominantly expressed in steroidogenic tissues
• FDX2 (Ferredoxin 2): Mitochondrial ferredoxin with overlapping functions
• FDX1L (Ferredoxin 1-like): A truncated variant

Role in Neurodegeneration

Mitochondrial Dysfunction in Alzheimer's Disease

[Alzheimer's Disease](/diseases/alzheimers-disease) (AD) is characterized by progressive mitochondrial dysfunction that begins early in disease pathogenesis and worsens with disease progression. FER2 and other components of the iron-sulfur cluster assembly machinery are affected in several ways[@sanders2019]:

Electron Transport Chain Impairment:

• Mitochondria from AD patient brains show reduced activity of complexes I, II, and III
• The 2Fe-2S centers in these complexes are susceptible to oxidative damage
• Loss of FER2 function may contribute to decreased electron transfer efficiency

• Impaired Fe-S cluster assembly leads to increased free iron in the mitochondrial matrix
• Free iron catalyzes the production of reactive oxygen species (ROS) via Fenton chemistry
• ROS damage mtDNA, proteins, and lipids, creating a feedforward cycle of dysfunction

• AD brain shows increased iron accumulation in amyloid plaques and neurofibrillary tangles
• Altered expression of ferritin and other iron storage proteins
• FER2 may contribute to or be affected by this iron dysregulation[@squitti2012]

• Amyloid-beta oligomers directly impair mitochondrial function
• They can bind to mitochondrial proteins and disrupt electron transport
• May affect the expression and function of FER2 and related proteins

Mitochondrial Dysfunction in Parkinson's Disease

[Parkinson's Disease](/diseases/parkinsons-disease) (PD) is strongly linked to mitochondrial dysfunction, particularly affecting complex I of the electron transport chain[@bhat2015]:

Complex I Deficiency:

• Postmortem PD substantia nigra shows 30-40% reduction in complex I activity
• The Fe-S centers in complex I are particularly vulnerable to damage
• FER2 may contribute to maintaining complex I function through Fe-S cluster delivery

• Alpha-synuclein aggregates can localize to mitochondria
• They impair mitochondrial complex I activity and calcium handling
• Mitochondrial dysfunction may be exacerbated by impaired Fe-S cluster assembly

• PD brain shows increased iron in the substantia nigra
• Iron promotes oxidative stress and alpha-synuclein aggregation
• FER2 dysfunction may contribute to iron dysregulation in PD[@devo2012]

• Mutations in LRRK2 are a common cause of familial PD
• LRRK2 can affect mitochondrial function and dynamics
• Interaction between LRRK2 and mitochondrial Fe-S machinery is under investigation

Other Neurodegenerative Conditions

Friedreich's Ataxia:

• Caused by reduced expression of [frataxin](/genes/fxn) (FXN), another mitochondrial Fe-S protein
• Shares features with FER2 dysfunction: mitochondrial iron overload, Fe-S deficiency
• While FER2 is not directly mutated in FRDA, understanding its function informs disease mechanisms

• Primary mitochondrial diseases often present with neurodegeneration
• Mutations in Fe-S cluster assembly genes (ISCU, FXN, BOLA3) cause severe phenotypes
• FER2 variants may contribute to susceptibility to mitochondrial dysfunction

Expression Patterns

Tissue Distribution

FER2 is expressed in tissues with high metabolic activity and mitochondrial content:

• Brain: High expression in [cortex](/brain-regions/cortex), [hippocampus](/brain-regions/hippocampus), and [cerebellum](/brain-regions/cerebellum)
• Heart: Very high expression given cardiac muscle's mitochondrial density
• Skeletal Muscle: High expression due to energy demands
• Liver: High expression for metabolic and detoxification functions
• Kidney: Moderate expression for active transport processes
• Adrenal Gland: Expression for steroidogenesis

Cellular Localization

Within [neurons](/entities/neurons), FER2 is localized primarily to:

• Mitochondrial matrix: The primary location for Fe-S cluster assembly
• Mitochondrial cristae: Where electron transport chain complexes reside
• Presynaptic terminals: High mitochondrial density for synaptic energy demands

Developmental Regulation

FER2 expression is developmentally regulated:

• High expression during embryonic development when mitochondrial biogenesis is active
• Maintained at moderate levels in adult brain
• May be upregulated under conditions of cellular stress or increased iron demand

Therapeutic Implications

Potential Therapeutic Targets

• Drugs that reduce mitochondrial iron overload may protect neurons
• Deferoxamine, deferasirox, and newer agents are under investigation
• Balancing iron reduction while maintaining Fe-S cluster assembly is critical

• Mitochondria-targeted antioxidants (MitoQ, MitoVitE)
• CoQ10 supplementation to support electron transport
• N-acetylcysteine to boost glutathione

• Small molecules that support ISC machinery function
• Gene therapy approaches to increase FER2 expression
• Computational screening for FER2 agonists

• PGC-1α agonists to increase mitochondrial mass
• Exercise and caloric restriction
• Pharmacological agents (bezafibrate, resveratrol)

Biomarker Potential

FER2 and related proteins may serve as:

• Diagnostic biomarkers: Altered FER2 levels in cerebrospinal fluid
• Progression markers: Correlation with disease severity
• Treatment response indicators: Changes following therapeutic intervention

Key Research Findings

2018-2024 Research Highlights

Related Pathways

Cross-Links to Related Pages

• [Mitochondrial dysfunction](/mechanisms/mitochondrial-dysfunction)
• [Iron-sulfur cluster biogenesis](/mechanisms/iron-sulfur-cluster-biogenesis)
• [Energy metabolism](/mechanisms/energy-metabolism)
• [Oxidative stress](/mechanisms/oxidative-stress)
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Parkinson's Disease](/diseases/parkinsons-disease)
• [Friedreich's Ataxia](/diseases/friedreichs-ataxia)
• [Mitochondria](/entities/mitochondria)
• [Ferredoxin](/proteins/ferredoxin)
• [Iron-sulfur cluster](/proteins/iron-sulfur-cluster)
• [Frataxin](/genes/fxn)

References

External Links

• [NCBI Gene: 27185](https://www.ncbi.nlm.nih.gov/gene/27185)
• [Ensembl: ENSG00000140497](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000140497)
• [UniProt: Q9NWD8](https://www.uniprot.org/uniprot/Q9NWD8)
• [GeneCards: FER2](https://www.genecards.org/cgi-bin/carddisp.pl?gene=FER2)
• [UCSC Genome Browser](https://genome.ucsc.edu/cgi-bin/hgTracks?db=hg19&position=chr19:14300000-14400000)