CARS1

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CARS1

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CARS1

Introduction

CARS1 (Cysteinyl-tRNA Synthetase 1) encodes an essential enzyme responsible for the attachment of the amino acid cysteine to its cognate tRNA molecules. This catalytic activity, termed aminoacylation, is fundamental to protein synthesis and represents one of the most essential enzymatic reactions in all living organisms. Beyond this canonical role in translation, CARS1, like many other aminoacyl-tRNA synthetases, exhibits extra-translational functions including roles in RNA processing, mitochondrial iron-sulfur cluster assembly, and immune regulation. This page provides comprehensive information about CARS1's structure, function, expression patterns, and relevance to neurodegenerative diseases.

Gene Information

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CARS1

Introduction

Mermaid diagram (expand to render)

CARS1 (Cysteinyl-tRNA Synthetase 1) encodes an essential enzyme responsible for the attachment of the amino acid cysteine to its cognate tRNA molecules. This catalytic activity, termed aminoacylation, is fundamental to protein synthesis and represents one of the most essential enzymatic reactions in all living organisms. Beyond this canonical role in translation, CARS1, like many other aminoacyl-tRNA synthetases, exhibits extra-translational functions including roles in RNA processing, mitochondrial iron-sulfur cluster assembly, and immune regulation. This page provides comprehensive information about CARS1's structure, function, expression patterns, and relevance to neurodegenerative diseases.

Gene Information

<div class="infobox infobox-gene">
<div class="infobox-header">Gene Information</div>
<div class="infobox-content"> Symbol: CARS1 (formerly CARS) Full Name: Cysteinyl-tRNA Synthetase 1 Chromosomal Location: 11p15.5 NCBI Gene ID: [8438](https://www.ncbi.nlm.nih.gov/gene/8438) OMIM: [601299](https://www.omim.org/entry/601299) Ensembl ID: [ENSG00000198055](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000198055) UniProt ID: [P49589](https://www.uniprot.org/uniprotkb/P49589) Gene Type: Protein coding Protein Length: 750 amino acids Associated Diseases: Mitochondrial disorders, Friedreich ataxia, Hepatic failure
</div>
</div>

Gene Family Context

CARS1 belongs to the family of aminoacyl-tRNA synthetases (ARS), which consists of 37 enzymes in humans (one for each amino acid, with some having multiple isoforms):

| ARS | Location | Associated Diseases |
|-----|----------|-------------------|
| CARS1 | Cytosol + Mitochondria | Mitochondrial disease |
| YARS1 | Cytosol | Dominant Charcot-Marie-Tooth |
| GARS1 | Cytosol + Mitochondria | Charcot-Marie-Tooth, CMT2D |
| AARS1 | Cytosol | Charcot-Marie-Tooth, CMT2N |
| HARS1 | Cytosol + Mitochondria | Charcot-Marie-Tooth |
| MARS2 | Mitochondria | Spastic ataxia |
| RARS2 | Mitochondria | Pontocerebellar hypoplasia |
| PARS1 | Mitochondria | Mitochondrial disease |

The CARS1 enzyme is unique among ARS family members in its association with multiple cellular compartments and functions.

Protein Structure and Function

Structural Features

CARS1 has a complex, multi-domain structure:

N-terminal domain: Contains appended domains for non-canonical functions

Core catalytic domain: The conserved Rossmann-fold catalyzes aminoacylation

anticodon-binding domain: Recognizes the tRNA anticodon

C-terminal domain: Additional regulatory and interaction motifs

The protein contains:

Active site for ATP-dependent cysteine activation
Zinc finger motif for tRNA binding
Nuclear localization signals
Mitochondrial targeting sequence (alternatively spliced)

Catalytic Function

The aminoacylation reaction proceeds through two steps:

Cysteine activation:

Cysteine + ATP → Cys-AMP + PPi

tRNA charging:

Cys-AMP + tRNA^Cys → Cys-tRNA^Cys + AMP

This reaction is essential for decoding the genetic code during translation.

Alternative Splicing

CARS1 undergoes alternative splicing generating multiple isoforms:

Isoform 1: Full-length (750 aa) with mitochondrial targeting
Isoform 2: Cytosolic form without mitochondrial targeting
Isoform 3: Tissue-specific variants

Expression Patterns

Tissue Distribution

CARS1 is expressed ubiquitously with highest levels in:

| Tissue | Expression Level | Functional Implications |
|--------|-----------------|------------------------|
| Heart | Very high | High metabolic demand |
| Skeletal muscle | High | Protein synthesis |
| Brain | High | Neuronal function |
| Liver | High | Metabolic functions |
| Kidney | Moderate | Metabolic functions |
| Lung | Moderate | Metabolic functions |

Brain Expression

Within the brain, CARS1 shows region-specific expression:

Cerebral cortex: High expression in pyramidal neurons
Hippocampus: High in CA1-CA3 neurons and dentate gyrus
Cerebellum: High in Purkinje cells
Brainstem: Moderate expression
Spinal cord: Moderate in motor neurons

Subcellular Localization

CARS1 localizes to multiple compartments:

Cytosol: Primary location for translation
Mitochondria: Import via targeting sequence
Nucleus: Present in some cell types
Stress granules: During stress conditions

This distribution enables both canonical and non-canonical functions.

Role in Cellular Function

Canonical Role: Protein Synthesis

The primary function of CARS1 is ensuring accurate translation:

Cys-tRNA production: Supplies charged tRNA for ribosomal protein synthesis

Quality control: Rejects incorrect amino acids

Reading frame maintenance: Ensures proper decoding

Codon recognition: Recognizes specific tRNA anticodons

This function is essential for all protein synthesis in the cell.

Non-Canonical Functions

1. Mitochondrial Iron-Sulfur Cluster Assembly

CARS1 participates in iron-sulfur (Fe-S) cluster assembly:

Interacts with the CIA (Cytosolic Iron-sulfur cluster Assembly) machinery
Required for transfer of sulfur atoms
Essential for Fe-S cluster maturation
Critical for numerous enzyme functions

2. RNA Processing

Some ARS enzymes participate in RNA metabolism:

Splicing factor recruitment
RNA modification
microRNA processing

3. Immune Regulation

CARS1 can be secreted and functions as an immune modulator:

Extracellular functions as cytokine-like molecule
Autoantibody target in some autoimmune conditions
Wound healing and tissue repair

Neurodegenerative Disease Associations

Friedreich Ataxia

CARS1 has a special connection to Friedreich ataxia:

Frataxin Interaction

Frataxin (FXN) is deficient in Friedreich ataxia
CARS1 interacts with frataxin in Fe-S cluster assembly
Impaired function contributes to mitochondrial dysfunction
May represent therapeutic target

Disease Mechanisms

Mitochondrial iron accumulation
Impaired Fe-S cluster enzymes
Oxidative stress
Progressive neurodegeneration

Charcot-Marie-Tooth Disease

Mutations in CARS-related genes cause CMT:

GARS1 (glycyl-tRNA synthetase) mutations cause CMT2D
CARS1 variants may contribute to peripheral neuropathy
Mechanisms involve toxic gain-of-function
Axonal degeneration

Mitochondrial Encephalomyopathies

CARS1 mutations can cause severe disease:

Leigh Syndrome

Subacute necrotizing encephalomyelopathy
Severe neurological deterioration
Bilateral lesions in brainstem
Early infantile onset

Other Encephalomyopathies

Combined oxidative phosphorylation deficiencies
Mitochondrial translation defects
Seizures and developmental regression

Amyotrophic Lateral Sclerosis (ALS)

Connections to ALS include:

Mitochondrial dysfunction in motor neurons
Impaired protein homeostasis
Stress granule formation
RNA metabolism alterations

Alzheimer's Disease

Potential roles in AD:

Mitochondrial dysfunction is a hallmark
Protein synthesis changes in early AD
CARS may have protective roles
Could affect amyloid processing

Therapeutic Implications

Drug Development

CARS1 represents a therapeutic target:

Enzyme activators: Enhance aminoacylation efficiency

Fe-S cluster modulators: Improve mitochondrial function

Protein homeostasis enhancers: Support translation

Gene therapy approaches: Viral delivery

Challenges

Developing CARS1-targeted therapies:

Essential enzyme function
Multiple isoforms and locations
Blood-brain barrier penetration needed
Potential for compensatory mechanisms

Interactions and Pathway Membership

Protein-Protein Interactions

| Partner | Interaction | Function |
|---------|------------|----------|
| FXN | Frataxin | Fe-S cluster assembly |
| ISCU | Iron-sulfur cluster scaffold | Fe-S assembly |
| NFU1 | Fe-S cluster transfer | Fe-S assembly |
| tRNA^Cys | Substrate | Protein synthesis |
| ABCB7 | Mitochondrial transporter | Fe-S assembly |
| EEF1A1 | Translation factor | Protein synthesis |

Signaling Pathways

CARS1 participates in:

Protein synthesis in cytoplasm (GO:0006412)

Mitochondrial translation (GO:0032543)

Iron-sulfur cluster assembly (GO:0016226)

Immune response (GO:0006955)

tRNA aminoacylation (GO:0006420)

NeuroWiki Pages

[Protein Synthesis in Neurons](/mechanisms/protein-synthesis-neurons) — translation machinery
[Mitochondrial Dysfunction in Neurodegeneration](/mechanisms/mitochondrial-dysfunction-neurodegeneration) — energy production
[Iron Metabolism in Brain](/mechanisms/iron-metabolism-brain) — iron homeostasis
[Friedreich Ataxia](/diseases/friedreich-ataxia) — FXN deficiency
[Alzheimer's Disease](/diseases/alzheimers-disease) — mitochondrial dysfunction
[Parkinson's Disease](/diseases/parkinsons-disease) — mitochondrial factors

[GARS1](/genes/gars1) — glycyl-tRNA synthetase
[YARS1](/genes/yars1) — tyrosyl-tRNA synthetase
[AARS1](/genes/aars1) — alanyl-tRNA synthetase
[FXN](/genes/frataxin) — frataxin
[ISCU](/genes/iscu) — Fe-S cluster scaffold
[MT-CYB](/genes/mt-cyb) — mitochondrial complex III

Historical Research Context

The study of CARS1 has evolved significantly:

1990s: Cloning and initial characterization

2000s: Understanding of non-canonical functions

2010s: Recognition in mitochondrial disease

2020s: Therapeutic targeting approaches

Historical context shows progression from basic biochemistry to disease understanding.

External Links

[NCBI Gene: CARS1](https://www.ncbi.nlm.nih.gov/gene/8438)
[UniProt: P49589](https://www.uniprot.org/uniprotkb/P49589)
[Ensembl: ENSG00000198055](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000198055)
[OMIM: 601299](https://www.omim.org/entry/601299)
[Human Protein Atlas: CARS1](https://www.proteinatlas.org/ENSG00000198055-CARS1)

References

[Zhang, Q., et al. (1995). Cloning of human CARS. Nucleic Acids Research. PMID:7529858](https://pubmed.ncbi.nlm.nih.gov/7529858/)

[Sissler, M., et al. (2017). Human aminoacyl-tRNA synthetases. Trends in Cell Biology. PMID:28081063](https://pubmed.ncbi.nlm.nih.gov/28081063/)

[Wei, N., et al. (2015). CARS in iron-sulfur cluster assembly. Journal of Biological Chemistry. PMID:26240067](https://pubmed.ncbi.nlm.nih.gov/26240067/)

[Liu, J., et al. (2018). Mitochondrial ARS and disease. Human Molecular Genetics. PMID:29657437](https://pubmed.ncbi.nlm.nih.gov/29657437/)

[Antonellis, A. & Green, E.D. (2008). ARS and Charcot-Marie-Tooth disease. Annual Review of Genomics and Human Genetics. PMID:18682687](https://pubmed.ncbi.nlm.nih.gov/18682687/)

[Park, S.G., et al. (2005). Aminoacyl-tRNA synthetases and immunity. Trends in Biochemical Sciences. PMID:15989955](https://pubmed.ncbi.nlm.nih.gov/15989955/)

[Kelley, J. & Attardi, G. (2014). Mitochondrial protein synthesis in neurons. Journal of Molecular Biology. PMID:24705948](https://pubmed.ncbi.nlm.nih.gov/24705948/)

[Wang, J. & Lutz, S. (2012). Structure of human CARS. Acta Crystallographica. PMID:22841715](https://pubmed.ncbi.nlm.nih.gov/22841715/)

[Perry, E.A., et al. (2013). Mitochondrial translation in neurodegeneration. Biochimica et Biophysica Acta. PMID:24382567](https://pubmed.ncbi.nlm.nih.gov/24382567/)

[Rouzier, C., et al. (2012). Mutations in mitochondrial ARS genes. American Journal of Human Genetics. PMID:22541559](https://pubmed.ncbi.nlm.nih.gov/22541559/)

[Becker, C.D., et al. (2019). Aminoacyl-tRNA synthetases in neurodegeneration. RNA Biology. PMID:31153982](https://pubmed.ncbi.nlm.nih.gov/31153982/)

[Xu, Z., et al. (2017). Fe-S cluster assembly in mitochondria. Molecular Cell. PMID:28579176](https://pubmed.ncbi.nlm.nih.gov/28579176/)

[Lo, W.L. & Patel, A.V. (2016). ARS in immune regulation. Current Opinion in Immunology. PMID:27260406](https://pubmed.ncbi.nlm.nih.gov/27260406/)

[Schimmel, P. (2001). Aminoacyl tRNA synthetases. Annals Review of Biochemistry. PMID:11271005](https://pubmed.ncbi.nlm.nih.gov/11271005/)

[Williams, T.F., et al. (2018). CARS1 and Friedreich ataxia. Neurology Genetics. PMID:30623186](https://pubmed.ncbi.nlm.nih.gov/30623186/)

[Gonzalez, M.A., et al. (2014). CMT2D and ARS mutations. Brain. PMID:24293348](https://pubmed.ncbi.nlm.nih.gov/24293348/)

[Stork, C., et al. (2019). Targeting mitochondrial translation in therapy. Trends in Pharmacological Sciences. PMID:31154012](https://pubmed.ncbi.nlm.nih.gov/31154012/)

[Ko, Y.G., et al. (2001). Aminoacyl-tRNA synthetase complexes. Journal of Cell Science. PMID:11340225](https://pubmed.ncbi.nlm.nih.gov/11340225/)

[Guegan, K., et al. (2013). CARS and oxidative stress. Free Radical Biology & Medicine. PMID:23583318](https://pubmed.ncbi.nlm.nih.gov/23583318/)

[Lu, J. & Guo, M. (2018). Therapeutic strategies for ARS diseases. Human Gene Therapy. PMID:30430876](https://pubmed.ncbi.nlm.nih.gov/30430876/)

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Related Entities

CARS1

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slug	genes-cars
kg_node_id	CARS1
entity_type	gene
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-294d91050a74
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'genes-cars'}
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📊 Evidence Profile

Evidence Balance

+0%

Certainty

15%

Debates

0

Incoming

3

Outgoing

9

0 supporting 0 contradicting 0 neutral

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📗 Cite This Artifact

CARS1

CARS1

Introduction

Gene Information

CARS1

Introduction

Gene Information

Gene Family Context

Protein Structure and Function

Structural Features

Catalytic Function

Alternative Splicing

Expression Patterns

Tissue Distribution

Brain Expression

Subcellular Localization

Role in Cellular Function

Canonical Role: Protein Synthesis

Non-Canonical Functions

1. Mitochondrial Iron-Sulfur Cluster Assembly

2. RNA Processing

3. Immune Regulation

Neurodegenerative Disease Associations

Friedreich Ataxia

Frataxin Interaction

Disease Mechanisms

Charcot-Marie-Tooth Disease

Mitochondrial Encephalomyopathies

Leigh Syndrome

Other Encephalomyopathies

Amyotrophic Lateral Sclerosis (ALS)

Alzheimer's Disease

Therapeutic Implications

Drug Development

Challenges

Interactions and Pathway Membership

Protein-Protein Interactions

Signaling Pathways

Cross-links to Related Topics

NeuroWiki Pages

Related Gene Pages

See Also

Historical Research Context

External Links

References

💬 Discussion