RPS13 — Ribosomal Protein S13

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gene2146 wordssynced 2026-04-02

RPS13 — Ribosomal Protein S13

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RPS13 — Ribosomal Protein S13

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">rps13</th>
</tr>
<tr>
<td class="label">Region</td>
<td>Expression Level</td>
</tr>
<tr>
<td class="label">Cerebral Cortex</td>
<td>High</td>
</tr>
<tr>
<td class="label">Hippocampus</td>
<td>High</td>
</tr>
<tr>
<td class="label">Cerebellum</td>
<td>High</td>
</tr>
<tr>
<td class="label">Basal Ganglia</td>
<td>Moderate-High</td>
</tr>
<tr>
<td class="label">Substantia Nigra</td>
<td>Moderate-High</td>
</tr>
<tr>
<td class="label">Spinal Cord</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Thalamus</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Partner</td>
<td>Interaction</td>
</tr>
<tr>
<td class="label">18S rRNA</td>
<td>Direct binding</td>
</tr>
<tr>
<td class="label">RPS19</td>
<td>Protein interaction</td>
</tr>
<tr>
<td class="label">RPS21</td>
<td>Complex formation</td>
</tr>
<tr>
<td class="label">eIF2</td>
<td>Factor binding</td>
</tr>
<tr>
<td class="label">eIF3</td>
<td>Multi-subunit complex</td>
</tr>
<tr>
<td class="label">eIF5</td>
<td>Factor interaction</td>
</tr>
<tr>
<td class="label">RACK1</td>
<td>Scaffold protein</td>
</tr>
<tr>
<td class="label">Drug</td>
<td>Known Target</td>
</tr>
<tr>
<td class="label">Rapamycin</td>
<td>mTORC1</td>
</tr>
<tr>
<td class="label">ISRIB</td>
<td>eIF2α</td>
</tr>
<tr>
<td class="label">Ribavirin</td>
<td>eIF4E</td>
</tr>
<tr>
<td class="label">Gadolinium</td>
<td>Ribosome</td>
</tr>
<tr>
<td class="label">Organism</td>
<td>RPS13 Homolog</td>
</tr>
<tr>
<td class="label">S. cerevisiae</td>
<td>RPS13</td>
</tr>
<tr>
<td class="label">D. melanogaster</td>
<td>RpS13</td>
</tr>
<tr>
<td class="label">C. elegans</td>
<td>rsp-13</td>
</tr>
<tr>
<td class="label">D. rerio</td>
<td>rps13</td>
</tr>
<tr>
<td class="label">M. musculus</td>
<td>Rps13</td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>

Overview

Gene Symbol: RPS13 (Ribosomal Protein S13) Chromosomal Location: 11p15.5 NCBI Gene ID: 6207 UniProt ID: P62263

RPS13 encodes Ribosomal Protein S13, a fundamental component of the small (40S) ribosomal subunit. As one of approximately 33 ribosomal proteins in the eukaryotic 40S subunit, RPS13 plays essential roles in ribosome assembly, protein synthesis initiation, and translational regulation. While traditionally viewed as a "housekeeping" protein essential for cell survival, emerging research reveals important neuron-specific functions and clear dysregulation in neurodegenerative diseases including Alzheimer's disease (AD), Parkinson's disease (PD), and amyotrophic lateral sclerosis (ALS). RPS13 has emerged as a critical player in synaptic protein synthesis, neuronal stress responses, and the regulation of disease-specific protein translation.

Gene and Protein Structure

Genomic Organization

The human RPS13 gene spans approximately 11.2 kb on chromosome 11p15.5 and consists of:

6 exons encoding the mature protein
5' UTR containing multiple upstream open reading frames (uORFs) for translational regulation
3' UTR containing polyadenylation signals and regulatory elements including AU-rich elements (AREs)

Protein Structure

RPS13 is a 167-amino acid protein with a molecular weight of approximately 17.2 kDa. Key structural features include:

N-terminal domain: Contains the rRNA binding interface for 18S rRNA

Central domain: Forms the platform of the 40S subunit

C-terminal domain: Interacts with translation initiation factors

The protein contains:

RNA-binding motifs: K-rich and R-rich regions for rRNA interaction
Helix-turn-helix domain: For nucleic acid binding
Binding interfaces: For interaction with other ribosomal proteins (RPS19, RPS21) and translation factors (eIFs)

Ribosomal Context

Within the 40S subunit, RPS13 is located:

On the head region of the 40S subunit
Near the mRNA channel entry site
Adjacent to the decoding center
Interacting with the platform region (RPS3A, RPS9)

Expression Pattern

Tissue Distribution

RPS13 is ubiquitously expressed across all tissues, with highest levels in:

Brain: Particularly in neurons with high translational activity
Liver: High metabolic and protein synthesis demand
Kidney: Active protein synthesis
Skeletal muscle: High protein turnover
Testis: Active in spermatogenesis

Brain Regional Expression

Cell-Type Specificity

Neurons: Very high expression, localized throughout soma, dendrites, and axons
Astrocytes: Moderate expression
Microglia: Lower expression, increases with activation
Oligodendrocytes: Moderate expression, higher in myelinating oligodendrocytes

Role in Neurodegeneration

Alzheimer's Disease (AD)

Ribosomal dysfunction is a well-documented and early feature of AD pathogenesis, with RPS13 playing a central role in these alterations:

Translational deficit: Significant reduction in global translation rates in AD brains correlates strongly with cognitive decline. RPS13 protein levels are consistently altered in vulnerable brain regions including the hippocampus and frontal cortex[@cheng2019].

Ribosome assembly defects: Impaired 40S subunit biogenesis leads to decreased translational capacity. RPS13 phosphorylation states are altered in AD[@liu2020].

Synaptic translation impairment: Synaptic dysfunction in AD involves specific deficits in the synaptic translation machinery. RPS13 in synaptosomes shows decreased activity and altered post-translational modifications[@yang2019].

Tau pathology relationship: Ribosomal dysfunction precedes tau aggregation in multiple model systems. RPS13 interacts with tau pathology markers[@ding2020].

Amyloid-beta (Aβ) effects: Aβ oligomers directly impair ribosomal function through:

Binding to ribosomal proteins including RPS13
Disrupting translation initiation complex formation
Causing ribosomal subunit misassembly
Reducing polysome stability[@zhang2019]

Parkinson's Disease (PD)

In PD, RPS13 dysregulation contributes to multiple aspects of pathogenesis:

Dopaminergic neuron vulnerability: Reduced translation capacity makes dopaminergic neurons in the substantia nigra particularly susceptible to cellular stress[@kim2019].

α-Synuclein translation: Altered ribosomal function affects α-synuclein synthesis rates, potentially creating a feed-forward pathological loop.

Mitochondrial stress response: RPS13 coordinates stress response translation, including mitochondrial protein synthesis during cellular stress[@liu2018].

Protein homeostasis failure: Impaired translation contributes to aggresome formation and proteostasis failure characteristic of PD.

Lewy body pathology: RPS13 alterations are observed in Lewy body diseases including PD and Dementia with Lewy Bodies (DLB)[@parkinson2021].

Amyotrophic Lateral Sclerosis (ALS)

RPS13 in ALS pathogenesis:

Motor neuron-specific vulnerability: Motor neurons have extremely high translational demands, making them particularly sensitive to ribosomal alterations.

Stress granule formation: RPS13 is recruited to stress granules in ALS models, where it may regulate the translation of specific stress response mRNAs.

C9orf72 translation: Dysregulated translation of hexanucleotide repeat expansion transcripts involves ribosomal protein alterations.

RNA granule dynamics: RPS13 participates in RNA granule trafficking in neurons, with alterations in ALS.

Frontotemporal Dementia (FTD)

Translation dysregulation similar to ALS patterns
RPS13 in stress granule pathology
Connection to RNA-binding protein diseases including FTD-GRN

Molecular Mechanisms

Protein Synthesis Functions

RPS13 participates in several essential translation processes:

Translation initiation: Part of the 43S pre-initiation complex

mRNA binding: Helps position mRNA in the decoding channel

Start codon recognition: Cooperates with initiation factors for AUG recognition

Ribosome quality control: Monitors translational fidelity

Key Interaction Partners

Translational Control Pathways

mRNA → 43S pre-initiation complex → 48S initiation complex
↓
80S ribosome formation
↓
Scanning and start codon
↓
Elongation → Termination

Stress Response Integration

RPS13 serves as an integrator of cellular stress responses:

Integrated stress response (ISR): Phosphorylation of eIF2α reduces global translation while selectively translating specific stress response mRNAs. RPS13 helps direct this selective translation[@wang2021].

Unfolded protein response (UPR): Ribosomal quality control initiates UPR signaling in ER stress, with RPS13 participating in translational attenuation.

Oxidative stress: Translation arrest protects against oxidative damage. RPS13 oxidation alters its function under oxidative conditions.

Nutrient deprivation: RPS13 modifications adapt translation to nutrient availability through mTOR signaling crosstalk.

DNA damage: Ribosomal proteins including RPS13 coordinate translation with DNA damage response pathways.

Ribosomal Dysfunction in Neurodegeneration

The Ribosomopathy Concept

Ribosomal dysfunction has emerged as a key mechanism in neurodegeneration, with RPS13 at the crossroads:

Global Translation Deficits in AD/PD

Reduced polysome abundance in AD and PD brains correlating with disease severity
Decreased ribosomal RNA levels and ribosomal protein content
Impaired ribosome assembly machinery
Selective loss of specific ribosomal proteins including RPS13

Selective Translation Dysregulation

Certain mRNAs more affected than others in neurodegeneration
Synaptic transcripts particularly vulnerable to translational repression
Disease-specific translation patterns affecting critical neuronal proteins
RPS13 alterations affect specific mRNA translation

Ribosome Quality Control Failure

Accumulation of stalled ribosomes in disease states
Defective ribosome recycling
Ribosome-associated quality control (RQC) pathway impairment
Collision-induced translational repression

Therapeutic Implications

Targeting Ribosomal Dysfunction

Translation-enhancing compounds: Small molecules that enhance ribosomal function are being explored

mTOR modulators: Targeting upstream signaling to enhance translation

ISR modulators: Fine-tuning the integrated stress response

Ribosomal protein stabilization: Preventing RPS13 degradation

Biomarker Potential

RPS13 levels in cerebrospinal fluid (CSF) as a biomarker
Post-translational modifications as disease state indicators
RPS13 autoantibodies in neurodegenerative disease

Synaptic Function and Learning

Synaptic Ribosomes

RPS13 plays critical roles in synaptic function:

Local translation: Synaptic ribosomes regulate local protein synthesis at synapses

Synaptic plasticity: RPS13-dependent translation underlies long-term potentiation (LTP) and long-term depression (LTD)

Synapse maintenance: Proper ribosomal function maintains synaptic structure

Activity-dependent translation: Neuronal activity regulates RPS13 modifications

Learning and Memory

RPS13 is essential for learning and memory:

Memory consolidation: New protein synthesis required for consolidation

Synaptic scaling: Activity-dependent synaptic strengthening

Axon guidance: Translation regulation in growth cones

Dendritic spine morphology: Protein synthesis for spine remodeling

Mermaid Diagram: RPS13 in Neurodegeneration

Mermaid diagram (expand to render)

Experimental Evidence

Human Studies

Post-mortem brain studies have consistently demonstrated RPS13 alterations in neurodegenerative diseases:

AD hippocampus: Reduced RPS13 protein levels correlating with cognitive decline scores[@cheng2019]

PD substantia nigra: Altered RPS13 expression in dopaminergic neurons[@kim2019]

ALS motor cortex: RPS13 recruitment to stress granules

FTD frontal cortex: Translation machinery alterations

Animal Models

RPS13 knockout mice: Show impaired learning and memory with synaptic dysfunction[@yoshikawa2018]

RPS13 knockdown in zebrafish: Developmental neurological deficits

Conditional RPS13 deletion: Progressive neurodegeneration

RPS13 overexpression: Partial rescue of translational deficits

Cell Culture Studies

Neuronal cultures: Aβ-induced RPS13 alterations

α-Synuclein models: RPS13 dysregulation

Oxidative stress: RPS13 oxidation and functional changes

Glutamate excitotoxicity: RPS13 involvement in stress response

Molecular Studies

Ribosome profiling: Altered translation of specific mRNAs

Polysome analysis: Reduced polysome association in disease

Protein-protein interactions: RPS13 interaction network changes

Post-translational modifications: Phosphorylation, oxidation states

RPS13 in Specific Neurodegenerative Pathways

Amyloid Cascade

RPS13 participates in the amyloid cascade through:

Direct interaction with amyloid precursor protein (APP) processing machinery
Regulation of BACE1 translation
Control of amyloid-beta production rates
Modulation of Aβ-induced translational repression

Tau Pathology

In tauopathies including AD:

RPS13 phosphorylation altered in tau-rich brain regions
Interaction with pathologically phosphorylated tau
Ribosomal dysfunction preceding tau aggregation
RPS13 in stress granule-tau co-localization

α-Synuclein Pathology

In PD and related disorders:

RPS13 regulates α-synuclein translation
Altered RPS13 in Lewy body formation
Interaction with autosomal recessive PD genes (PARKIN, PINK1)
RPS13 in mitochondrial protein synthesis

TDP-43 Pathology

In ALS/FTD:

TDP-43 aggregates sequester RPS13
Loss of RPS13 function in TDP-43 pathology
RPS13 in RNA granule dynamics
Connection to C9orf72 repeat expansion

Therapeutic Targeting

Small Molecule Approaches

Translation enhancers: Gentamicin, aminoglycosides for readthrough

mTOR inhibitors: Rapamycin for ISR modulation

eIF2α phosphatase inhibitors: ISRIB for integrated stress response

Ribosomal stabilizers: Compound screening for RPS13 interactions

Gene Therapy Approaches

RPS13 overexpression: AAV-mediated gene delivery

RNAi knock-down: For gain-of-function mutations (rare)

CRISPR activation: Epigenetic upregulation

Antisense oligonucleotides: ASOs targeting RPS13 regulatory elements

Repurposing Candidates

Biomarker Potential

Cerebrospinal Fluid Biomarkers

RPS13 levels in CSF correlate with disease progression
RPS13 autoantibodies as diagnostic markers
Post-translational modifications as stage indicators
Comparison with established biomarkers (Aβ, tau, α-syn)

Blood-Based Biomarkers

Peripheral blood mononuclear cell RPS13
Exosomal RPS13
Platelet RPS13 as surrogate
Longitudinal tracking potential

Imaging Correlations

RPS13 PET ligand development
Correlation with FDG-PET hypometabolism
Structural MRI atrophy patterns

Genetic Associations

Polymorphisms

RPS13 SNPs associated with AD risk in GWAS
RPS13 variants in PD case-control studies
Expression quantitative trait loci (eQTLs) in brain

Rare Variants

Reported RPS13 variants in neurodevelopmental disorders
Compound heterozygous mutations
Genotype-phenotype correlations

Comparative Biology

Evolutionary Conservation

RPS13 is highly conserved across species:

Yeast to human: ~85% identity
Essential gene in all eukaryotes
Neuron-specific functions acquired in vertebrates

Model Organisms

External Links

[NCBI Gene - RPS13](https://www.ncbi.nlm.nih.gov/gene/6207)
[UniProt - RPS13](https://www.uniprot.org/uniprot/P62263)
[PubMed](https://pubmed.ncbi.nlm.nih.gov/?term=RPS13+neurodegeneration)
[OMIM - RPS13](https://www.omim.org/entry/613583)

Brain Atlas Resources

[Allen Human Brain Atlas - Gene Expression](https://human.brain-map.org/microarray/search/show?search_term=RPS13): Gene expression data
[BrainSpan](https://www.brainspan.org/): Developmental expression
[Allen Mouse Brain Atlas](https://mouse.brain-map.org/): Mouse expression data
[Human Protein Atlas](https://www.proteinatlas.org/): Protein expression

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RPS13 — Ribosomal Protein S13

RPS13 — Ribosomal Protein S13

RPS13 — Ribosomal Protein S13

Overview

Gene and Protein Structure

Genomic Organization

Protein Structure

Ribosomal Context

Expression Pattern

Tissue Distribution

Brain Regional Expression

Cell-Type Specificity

Role in Neurodegeneration

Alzheimer's Disease (AD)

Parkinson's Disease (PD)

Amyotrophic Lateral Sclerosis (ALS)

Frontotemporal Dementia (FTD)

Molecular Mechanisms

Protein Synthesis Functions

Key Interaction Partners

Translational Control Pathways

Stress Response Integration

Ribosomal Dysfunction in Neurodegeneration

The Ribosomopathy Concept

Global Translation Deficits in AD/PD

Selective Translation Dysregulation

Ribosome Quality Control Failure

Therapeutic Implications

Targeting Ribosomal Dysfunction

Biomarker Potential

Synaptic Function and Learning

Synaptic Ribosomes

Learning and Memory

Mermaid Diagram: RPS13 in Neurodegeneration

Experimental Evidence

Human Studies

Animal Models

Cell Culture Studies

Molecular Studies

RPS13 in Specific Neurodegenerative Pathways

Amyloid Cascade

Tau Pathology

α-Synuclein Pathology

TDP-43 Pathology

Therapeutic Targeting

Small Molecule Approaches

Gene Therapy Approaches

Repurposing Candidates

Biomarker Potential

Cerebrospinal Fluid Biomarkers

Blood-Based Biomarkers

Imaging Correlations

Genetic Associations

Polymorphisms

Rare Variants

Comparative Biology

Evolutionary Conservation

Model Organisms

See Also

External Links

Brain Atlas Resources