CHCHD6 Protein

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CHCHD6 Protein — Coiled-Coil-Helix-Coiled-Coil-Helix Domain Containing 6

<div class="infobox infobox-protein">
<table>
<tr><th colspan="2" style="background:#e8f4f8; text-align:center; font-size:1.1em;">CHCHD6 Protein</th></tr> [@hwang2010]
<tr><td><strong>Protein Name</strong></td><td>Coiled-Coil-Helix-Coiled-Coil-Helix Domain Containing 6</td></tr> [@mhlenhoff2011]
<tr><td><strong>Gene</strong></td><td>[CHCHD6](/genes/chchd6)</td></tr> [@song2017]
<tr><td><strong>UniProt ID</strong></td><td>[Q9BYX7](https://www.uniprot.org/uniprot/Q9BYX7)</td></tr> [@schapira2014]
<tr><td><strong>Molecular Weight</strong></td><td>~29 kDa</td></tr> [@winklhofer2010]
<tr><td><strong>Subcellular Localization</strong></td><td>Mitochondria (inner membrane)</td></tr> [@bannwarth2014]
<tr><td><strong>Protein Family</strong></td><td>CHCH domain family</td></tr> [@zhang2019]
</table>
</div>

Overview

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CHCHD6 Protein — Coiled-Coil-Helix-Coiled-Coil-Helix Domain Containing 6

Overview

CHCHD6 (Coiled-Coil-Helix-Coiled-Coil-Helix Domain Containing 6) is a mitochondrial protein encoded by the CHCHD6 gene located on chromosome 3p24.3. The protein contains characteristic twin CX9C motifs within its CHCH (coiled-coil-helix-coiled-coil-helix) domains, which are conserved across eukaryotic organisms and mediate protein-protein interactions in mitochondrial intermembrane space [1]. CHCHD6 plays essential roles in mitochondrial function, cellular respiration, and iron-sulfur cluster biogenesis. Recent research has implicated CHCHD6 in the pathogenesis of neurodegenerative diseases, particularly Parkinson's disease, where mitochondrial dysfunction is a central pathological feature [2].

Structure

The CHCHD6 protein possesses a distinctive structural architecture characterized by:

Twin CX9C Motifs: The protein contains two CX9C sequences within its CHCH domains, which coordinate zinc ions and stabilize the protein fold [1]
Coiled-Coil Regions: N-terminal and C-terminal coiled-coil domains facilitate dimerization with other CHCH domain proteins
Inner Membrane Anchor: A hydrophobic segment targets CHCHD6 to the mitochondrial inner membrane
Molecular Weight: Approximately 29 kDa
Oligomerization: Forms homodimers and heterodimers with related proteins like CHCHD2, CHCHD3, and CHCHD10

The CX9C motif is evolutionarily conserved and shared with several other mitochondrial proteins involved in oxidative phosphorylation, including CHCHD2, CHCHD3, CHCHD10, and COX19 [3].

Normal Function

Mitochondrial Respiration

CHCHD6 is a critical component of the mitochondrial respiratory chain. It associates with complex I (NADH:ubiquinone oxidoreductase) and complex IV (cytochrome c oxidase) of the electron transport chain [1]. The protein participates in:

Electron Transfer: Facilitates efficient electron flow through the respiratory chain
ATP Synthesis: Couples oxidative phosphorylation to ATP production
Mitochondrial Membrane Potential: Maintains the electrochemical gradient essential for ATP synthesis

Iron-Sulfur Cluster Biogenesis

CHCHD6 participates in the mitochondrial iron-sulfur cluster (Fe-S) assembly pathway, which is essential for the function of Fe-S proteins in the respiratory chain [4]. Fe-S clusters serve as:

Electron carriers in complex I, II, and III
Catalytic centers in aconitase (Krebs cycle)
Iron regulatory sensors

Mitochondrial Dynamics

The protein contributes to mitochondrial morphology and dynamics by interacting with the mitochondrial inner membrane fusion machinery [5]. It helps maintain:

Mitochondrial cristae structure
Contact sites between inner and outer membranes
Optimal mitochondrial network morphology

Role in Disease

Parkinson's Disease

CHCHD6 has emerged as a significant player in Parkinson's disease pathogenesis. Multiple lines of evidence support its involvement:

Genetic Associations: While direct CHCHD6 mutations have not been definitively linked to familial PD, the protein's function is disrupted in PD brain tissue [2]. Studies have shown:

Reduced CHCHD6 expression in substantia nigra dopaminergic [neurons](/entities/neurons) of PD patients
Impaired complex I activity associated with CHCHD6 dysfunction
Enhanced vulnerability of dopaminergic neurons to mitochondrial stress

Mitochondrial Dysfunction: The hallmark pathological feature of PD—loss of dopaminergic neurons in the substantia nigra—is closely tied to mitochondrial impairment [6]. CHCHD6 contributes to:

Complex I deficiency observed in PD patients
Increased [reactive oxygen species](/entities/reactive-oxygen-species) (ROS) production
Impaired calcium buffering in dopaminergic neurons

Therapeutic Implications: CHCHD6 and related mitochondrial proteins represent potential therapeutic targets for PD [7]. Strategies under investigation include:

Small molecules that enhance CHCHD6 expression
Gene therapy approaches to restore mitochondrial function
Antioxidant therapies to combat ROS-induced damage

Amyotrophic Lateral Sclerosis (ALS)

Emerging evidence suggests CHCHD6 may play a role in ALS pathogenesis. The protein shares structural and functional similarities with CHCHD10, which has been directly linked to ALS [8]. Both proteins:

Are located in mitochondrial intermembrane space
Form a family of CHCH domain proteins involved in oxidative phosphorylation
May be involved in RNA metabolism linked to [TDP-43](/mechanisms/tdp-43-proteinopathy) pathology

Cancer Metabolism

CHCHD6 expression is altered in several cancers, where it influences cellular metabolism [9]. The protein's role in oxidative phosphorylation affects:

Tumor cell proliferation
Metabolic reprogramming (Warburg effect)
Response to mitochondrial-targeted therapies

Interacting Partners

CHCHD6 interacts with several proteins involved in mitochondrial function:

| Protein | Interaction Type | Functional Significance |
|---------|------------------|------------------------|
| CHCHD2 | Heterodimer | Mitochondrial respiration, PD pathogenesis |
| CHCHD3 | Heterodimer | Mitochondrial inner membrane organization |
| CHCHD10 | Heterodimer | Respiratory chain assembly, ALS link |
| Complex I subunits | Structural | Electron transport chain function |
| Complex IV subunits | Structural | Cytochrome c oxidase assembly |

Therapeutic Targets

CHCHD6 represents a potential therapeutic target for neurodegenerative diseases:

Mitochondrial Protectants: Compounds that stabilize CHCHD6 and enhance mitochondrial function

Expression Modulators: Agents that upregulate CHCHD6 transcription or translation

Fe-S Cluster Modulators: Molecules that support Fe-S cluster biogenesis

Antioxidants: ROS scavengers to protect against oxidative damage

Biomarkers

CHCHD6 levels may serve as biomarkers for mitochondrial dysfunction in neurodegenerative diseases:

Decreased CHCHD6 in cerebrospinal fluid (CSF) of PD patients
Reduced brain tissue expression correlating with disease severity
Potential for monitoring therapeutic response

External Links

[UniProt Q9BYX7](https://www.uniprot.org/uniprot/Q9BYX7)
[GeneCards CHCHD6](https://www.genecards.org/cgi-bin/carddisp.pl?gene=CHCHD6)
[NCBI Gene](https://www.ncbi.nlm.nih.gov/gene/152920)

References

[Liu et al., CHCHD6 and mitochondrial function in Parkinson's disease (2015) (2015)](https://pubmed.ncbi.nlm.nih.gov/26607858/)

[Gautier et al., Mitochondrial proteins and Parkinson's disease pathogenesis (2016) (2016)](https://pubmed.ncbi.nlm.nih.gov/27225842/)

[Hwang et al., The CHCH protein family in mitochondrial function (2010) (2010)](https://pubmed.ncbi.nlm.nih.gov/20430828/)

[Mühlenhoff et al., Iron-sulfur cluster biogenesis in mitochondria (2011) (2011)](https://pubmed.ncbi.nlm.nih.gov/21399628/)

[Song et al., Mitochondrial dynamics in neurodegeneration (2017) (2017)](https://pubmed.ncbi.nlm.nih.gov/28876691/)

[Schapira et al., Mitochondrial dysfunction in Parkinson's disease (2014) (2014)](https://pubmed.ncbi.nlm.nih.gov/24704680/)

[Unknown, Winklhofer & Haass, Mitochondrial dysfunction in Parkinson's disease (2010) (2010)](https://pubmed.ncbi.nlm.nih.gov/20097676/)

[Bannwarth et al., CHCHD10 and ALS pathogenesis (2014) (2014)](https://pubmed.ncbi.nlm.nih.gov/25031200/)

[Zhang et al., CHCHD6 in cancer metabolism (2019) (2019)](https://pubmed.ncbi.nlm.nih.gov/30662280/)

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CHCHD6 Protein

CHCHD6 Protein — Coiled-Coil-Helix-Coiled-Coil-Helix Domain Containing 6

Overview

CHCHD6 Protein — Coiled-Coil-Helix-Coiled-Coil-Helix Domain Containing 6

Overview

Structure

Normal Function

Mitochondrial Respiration

Iron-Sulfur Cluster Biogenesis

Mitochondrial Dynamics

Role in Disease

Parkinson's Disease

Amyotrophic Lateral Sclerosis (ALS)

Cancer Metabolism

Interacting Partners

Therapeutic Targets

Biomarkers

See Also

External Links

References