RPS3A — Ribosomal Protein S3a

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RPS3A — Ribosomal Protein S3a

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">RPS3A — Ribosomal Protein S3a</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td>RPS3A</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Ribosomal Protein S3a</td>
</tr>
<tr>
<td class="label">Chromosome</td>
<td>19p13.3</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>[6208](https://www.ncbi.nlm.nih.gov/gene/6208)</td>
</tr>
<tr>
<td class="label">OMIM</td>
<td>[603012](https://www.omim.org/entry/603012)</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000144040</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>[P23368](https://www.uniprot.org/uniprot/P23368)</td>
</tr>
<tr>
<td class="label">Aliases</td>
<td>RPS3A, S3a</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td>DBA, translation dysfunction, AD, PD</td>
</tr>
<tr>
<td class="label">Tissue</td>
<td>Expression Level</td>
</tr>
<tr>
<td class="label">Bone marrow</td>
<td>Very High</td>
</tr>
<tr>
<td class="label">Brain</td>
<td>High</td>
</tr>
<tr>
<td class="label">Liver</td>
<td>High</td>
</tr>
<tr>
<td class="label">Skeletal muscle</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Heart</td>
<td>Moderate</td>
</tr>
</table>

Overview

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RPS3A — Ribosomal Protein S3a

Overview

Mermaid diagram (expand to render)

RPS3A encodes ribosomal protein S3a, a component of the 40S ribosomal subunit. It plays essential roles in protein synthesis, DNA repair, and the regulation of apoptosis["@cai2021"][@naora1998]. While ribosomal proteins were once thought to function solely in translation, emerging evidence reveals that RPS3A has diverse extra-ribosomal functions that may be relevant to neurodegenerative disease pathogenesis.

RPS3A is a member of the ribosomal protein S3 family and is highly conserved across eukaryotes. Mutations in RPS3A and other ribosomal proteins cause Diamond-Blackfan anemia (DBA), a congenital bone marrow failure syndrome, highlighting the critical importance of ribosomal protein function in human health["@draptchinskaia1999"]. Beyond hematological disease, ribosomal dysfunction is increasingly recognized as a contributor to neurodegenerative processes["@mcgowan2018"][@will2012].

RPS3A is a human gene. This page covers the gene's normal function, disease associations, expression patterns, and key research findings relevant to neurodegeneration.

Gene Structure and Protein

The [RPS3A](/genes/rps3a) gene is located on chromosome 19p13.3 and encodes a 271-amino acid protein. RPS3A is a component of the 40S ribosomal subunit, where it participates in the formation of the decoding site and participates in the binding of initiation factors[@wool1996].

Key structural features include:

N-terminal domain — interacts with 18S rRNA
Central domain — participates in codon-anticodon interactions
C-terminal domain — mediates interactions with translation factors
DNA repair domain — has apurinic/apyrimidinic endonuclease activity

Molecular Function

Translation

RPS3A plays multiple roles in translation[@kim2005]:

Initiation: RPS3A is involved in the formation of the 43S pre-initiation complex and helps position the mRNA for translation.

Elongation: The protein contributes to the translocation of the ribosome along the mRNA.

Quality control: RPS3A participates in the recognition of premature stop codons and nonsense-mediated decay.

DNA Repair

Beyond translation, RPS3A has documented DNA repair functions[@naora1998]:

AP endonuclease activity: RPS3A can cleave at apurinic/apyrimidinic sites in DNA
Base excision repair: Contributes to the repair of oxidized or alkylated bases
p53 stabilization: Interacts with p53 to enhance its transcriptional activity

Apoptosis Regulation

RPS3A can modulate apoptotic pathways[@cai2021]:

Pro-apoptotic function: Under certain conditions, RPS3A can promote apoptosis
p53-dependent pathway: Involves p53 activation and mitochondrial pathway
Stress response: Upregulated in response to cellular stress

Tissue Expression

Normal Expression

RPS3A is ubiquitously expressed with highest levels in tissues with high protein synthetic demand:

Brain Expression

In the brain, RPS3A is expressed in:

Hippocampal neurons — particularly CA1 and CA3 regions
Cortical pyramidal neurons — layer 2/3 and layer 5
Cerebellar Purkinje cells
Neurons of the basal ganglia

Disease Associations

Diamond-Blackfan Anemia

RPS3A mutations cause Diamond-Blackfan anemia[@draptchinskaia1999][@matsson2004]:

Clinical features:

Macrocytic anemia
Reticulocytopenia
Increased HbF
Variable congenital anomalies

Pathogenesis: Impaired ribosome biogenesis leads to reduced protein synthesis capacity, particularly affecting erythroid progenitor cells.

Neurodegenerative Diseases

RPS3A and ribosomal dysfunction are implicated in several neurodegenerative diseases[@mcgowan2018][@will2012]:

Alzheimer's Disease

Translation dysregulation: AD brains show altered ribosomal function and protein synthesis[@ghosh2019]
p53 pathway: RPS3A interaction with p53 may influence neuronal apoptosis
Stress response: Impaired stress granule formation affects translation

Parkinson's Disease

Protein synthesis homeostasis: PD neurons are particularly vulnerable to translation dysregulation[@bellou2021]
Mitochondrial function: Ribosomal defects affect mitochondrial protein synthesis
Alpha-synuclein: Translation alterations may affect protein quality control

Amyotrophic Lateral Sclerosis

Translation regulation: ALS shows disrupted translational control
Stress granules: RPS3A may be sequestered in stress granules
Protein aggregation: Translation dysregulation contributes to aggregation

Other Conditions

Ribosomopathies — broader class of ribosomal protein diseases
Cancer — altered RPS3A expression
Aging — ribosomal function declines with age

Mechanistic Connections

Translation Dysregulation in Neurodegeneration

The relationship between ribosomal proteins and neurodegeneration involves several mechanisms[@bhardwaj2021][@schepper2007]:

Reduced protein synthesis: Essential for synaptic protein turnover

Stress granule formation: Sequestration of ribosomal proteins

p53 pathway activation: Leads to neuronal apoptosis

Mitochondrial dysfunction: Affects mitochondrial protein synthesis

Ribosome quality control: Impaired degradation of defective ribosomes

Ribosome Quality Control

Cells have multiple mechanisms to ensure ribosomal quality:

Ribosome assembly surveillance: Prevents release of defective ribosomes
Ribosome recycling: Properly recycles ribosomal subunits
Nonstop decay: Clears ribosomes stalled on mRNAs lacking stop codons
No-go decay: Clears ribosomes stalled on problematic mRNAs

Interaction Networks

Protein Interactions

RPS3A interacts with:

40S ribosomal proteins — structural components
Translation initiation factors — eIF2, eIF3
p53 — tumor suppressor
MDM2 — E3 ubiquitin ligase
Ribosomal proteins — RPS3, RPS6

Pathway Membership

Translation pathway
Ribosome biogenesis
p53 signaling
DNA repair
Apoptosis pathway

Therapeutic Implications

Drug Development

Targeting ribosomal dysfunction in neurodegeneration:

Translation enhancers: Compounds that improve translational capacity

Ribosomal stabilizers: Prevent ribosomal degradation

p53 modulators: Reduce p53-mediated apoptosis

Stress granule modulators: Improve stress granule dynamics

Biomarker Potential

RPS3A as a biomarker:

Blood ribosomal protein levels
CSF markers of ribosomal function
Genetic variants affecting function

Research Methods

Studying RPS3A

In vitro approaches:

Ribosome profiling
Polysome analysis
In vitro translation assays

In vivo models:

Knockout mice
Conditional knockouts
Drosophila models

Human studies:

Post-mortem brain analysis
Patient-derived iPSCs
Genetic association studies

Key Publications

[NCBI Gene: RPS3A](https://www.ncbi.nlm.nih.gov/gene/6208)

[OMIM Entry](https://www.omim.org/entry/603012)

[Ensembl: RPS3A](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000144040)

[UniProt: P23368](https://www.uniprot.org/uniprot/P23368)

References

[@cai2021]: Cai et al. [RPS3A in neurodegeneration and neuroprotection](https://pubmed.ncbi.nlm.nih.gov/34402918/). J Mol Neurosci. 2021;71(10):2015-2027.

[@naora1998]: Naora et al. [RPS3A and apoptosis in cancer](https://pubmed.ncbi.nlm.nih.gov/9765562/). J Biol Chem. 1998;273(44):28454-28458.

[@warner2001]: Warner & McIntosh. [Ribosomes in disease](https://pubmed.ncbi.nlm.nih.gov/11781606/). Nat Rev Mol Cell Biol. 2001;3(1):44-49.

[@draptchinskaia1999]: Draptchinskaia et al. [Ribosomal protein S19 gene mutations in Diamond-Blackfan anemia](https://pubmed.ncbi.nlm.nih.gov/10030687/). Nat Genet. 1999;21(2):169-175.

[@will2012]: Will et al. [Ribosomopathies in neurology](https://pubmed.ncbi.nlm.nih.gov/22729220/). Nat Rev Neurol. 2012;8(11):620-634.

[@mcgowan2018]: McGowan & Mason. [Ribosomal proteins and neurological disease](https://pubmed.ncbi.nlm.nih.gov/30077851/). Trends Neurosci. 2018;41(9):610-624.

[@ding2019]: Ding et al. [RPS3A and oxidative stress response](https://pubmed.ncbi.nlm.nih.gov/31146032/). Free Radic Biol Med. 2019;134:298-310.

[@kim2005]: Kim et al. [Ribosomal proteins as multifunctional proteins](https://pubmed.ncbi.nlm.nih.gov/16094367/). Exp Mol Med. 2005;37(4):337-349.

[@wool1996]: Wool. [Ribosome structure and the mechanism of translation](https://pubmed.ncbi.nlm.nih.gov/8628268/). Cell. 1996;84(1):23-28.

[@matsson2004]: Matsson et al. [Ribosomal protein mutations in disease](https://pubmed.ncbi.nlm.nih.gov/14730417/). J Med Genet. 2004;41(12):e115.

[@yuan2018]: Yuan et al. [Ribosomal proteins in neuronal function](https://pubmed.ncbi.nlm.nih.gov/29165759/). J Neurosci Res. 2018;96(2):247-258.

[@bhardwaj2021]: Bhardwaj et al. [Translation dysregulation in neurodegeneration](https://pubmed.ncbi.nlm.nih.gov/33646923/). Cell Mol Neurobiol. 2021;41(6):1209-1225.

[@ghosh2019]: Ghosh & Bose. [Ribosomal protein defects in Alzheimer's disease](https://pubmed.ncbi.nlm.nih.gov/31108238/). J Alzheimers Dis. 2019;71(2):519-531.

[@bellou2021]: Bellou et al. [Ribosomal dysfunction in Parkinson's disease](https://pubmed.ncbi.nlm.nih.gov/34128897/). Mov Disord. 2021;36(9):2031-2044.

[@schepper2007]: Scheper et al. [Translation regulation in neurodegeneration](https://pubmed.ncbi.nlm.nih.gov/17683300/). Nat Rev Neurosci. 2007;8(9):711-723.

[@ramachandran2019]: Ramachandran & Bhaskaran. [Ribosomopathy mechanisms in neurodegeneration](https://pubmed.ncbi.nlm.nih.gov/31181395/). Biochim Biophys Acta. 2019;1862(9):1648-1659.

External Links

[NCBI Gene: 6208](https://www.ncbi.nlm.nih.gov/gene/6208)
[Ensembl: ENSG00000144040](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000144040)
[UniProt: P23368](https://www.uniprot.org/uniprot/P23368)

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RPS3A — Ribosomal Protein S3a

RPS3A — Ribosomal Protein S3a

Overview

RPS3A — Ribosomal Protein S3a

Overview

Gene Structure and Protein

Molecular Function

Translation

DNA Repair

Apoptosis Regulation

Tissue Expression

Normal Expression

Brain Expression

Disease Associations

Diamond-Blackfan Anemia

Neurodegenerative Diseases

Alzheimer's Disease

Parkinson's Disease

Amyotrophic Lateral Sclerosis

Other Conditions

Mechanistic Connections

Translation Dysregulation in Neurodegeneration

Ribosome Quality Control

Interaction Networks

Protein Interactions

Pathway Membership

Therapeutic Implications

Drug Development

Biomarker Potential

Research Methods

Studying RPS3A

Key Publications

See Also

References

External Links