RPL13 — Ribosomal Protein L13

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RPL13 — Ribosomal Protein L13

Overview

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">RPL13 — Ribosomal Protein L13</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td>RPL13</td>
</tr>
<tr>
<td class="label">Name</td>
<td>Ribosomal Protein L13</td>
</tr>
<tr>
<td class="label">Chromosome</td>
<td>16q24.3</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>6142</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>P26373</td>
</tr>
<tr>
<td class="label">Gene Type</td>
<td>Protein coding</td>
</tr>
<tr>
<td class="label">Component</td>
<td>Large (60S) ribosomal subunit</td>
</tr>
<tr>
<td class="label">Mechanism</td>
<td>Description</td>
</tr>
<tr>
<td class="label">eIF2α phosphorylation</td>
<td>Global translation inhibition</td>
</tr>
<tr>
<td class="label">Stress granule accumulation</td>
<td>Sequestration of mRNAs and proteins</td>
</tr>
<tr>
<td class="label">Mitochondrial translation defect</td>
<td>Energy production failure</td>
</tr>
<tr>
<td class="label">Synaptic translation loss</td>
<td>Synapse dysfunction</td>
</tr>
<tr>
<td class="label">Ribosome-associated degradation</td>
<td>Cotranslational quality control failure</td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>

Introduction

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RPL13 — Ribosomal Protein L13

Overview

Introduction

RPL13 (Ribosomal Protein L13) encodes an essential ribosomal protein that constitutes a core component of the large 60S ribosomal subunit. As part of the eukaryotic ribosome machinery, RPL13 plays a critical role in protein synthesis, which is fundamental to all cellular processes. While ribosomal proteins were long considered primarily structural components, emerging research has revealed that many have moonlighting functions beyond translation, including roles in DNA repair, cell cycle regulation, and apoptosis [@ribosome-structure].

In the context of neurodegenerative diseases, ribosomal dysfunction has emerged as a significant pathological contributor. Both Alzheimer's disease (AD) and Parkinson's disease (PD) show profound alterations in translation machinery, with impaired ribosomal function contributing to downstream cellular deficits including disrupted protein homeostasis, stress granule formation, and synaptic dysfunction [@translation-dysregulation-ad][@pd-translation].

Molecular Function

Ribosomal Structure and Function

RPL13 is located in the large subunit of the cytoplasmic ribosome, where it contributes to the structural integrity and functional capacity of the translational apparatus. The eukaryotic ribosome consists of two subunits: the small 40S subunit responsible for mRNA binding and scanning, and the large 60S subunit that catalyzes peptide bond formation [@ribosome-structure].

RPL13 participates in:

Peptide bond formation: Contributing to the peptidyl transferase center
Ribosome assembly: Facilitating proper folding and assembly of the 60S subunit
tRNA positioning: Helping maintain correct tRNA positioning in the ribosomal A, P, and E sites
Translation elongation: Supporting the efficient progression of polypeptide synthesis

Extra-Ribosomal Functions

Beyond its canonical role in translation, RPL13 has been implicated in several cellular processes:

Apoptosis regulation: Some ribosomal proteins can influence apoptotic pathways
Cellular stress response: RPL13 can participate in stress-responsive signaling
Gene expression regulation: Potential involvement in transcriptional control through interactions with non-ribosomal proteins

Role in Neurodegenerative Diseases

Alzheimer's Disease

Translational dysregulation is a hallmark feature of Alzheimer's disease pathology. Multiple studies have documented reduced global translation in AD brains, with specific defects in the initialization and elongation phases of protein synthesis [@translation-dysregulation-ad].

Mechanistic pathways:

Ribosomal stress and phosphorylation: In AD, cellular stress triggers phosphorylation of eukaryotic translation initiation factor 2α (eIF2α), leading to global translation repression. This stress response affects ribosomal proteins including RPL13, altering their interaction with translation machinery [@ribosomal-stress-ad].

Stress granule formation: When translation is arrested, untranslated mRNAs complex with RNA-binding proteins to form stress granules. These membrane-less organelles are frequently observed in AD brains and are linked to cellular proteostasis failure [@stress-granules-nd].

Synaptic protein synthesis deficit: Synapses require local protein synthesis for plasticity and function. RPL13-mediated ribosomal dysfunction particularly affects translation of synaptic proteins, contributing to synaptic failure in AD [@synapse-translation].

Protein homeostasis collapse: The ubiquitin-proteasome system and autophagy are already compromised in AD. Ribosomal dysfunction adds another layer to proteostasis failure, leading to accumulation of misfolded proteins and proteotoxicity [@protein-homeostasis-nd].

Parkinson's Disease

Ribosomal dysfunction in PD has been documented in multiple studies, with particular emphasis on mitochondrial ribosomes and cytoplasmic translation machinery [@pd-translation][@ribosome-biogenesis-pd].

Mechanistic pathways:

mTOR pathway dysregulation: PD-linked mutations in genes like LRRK2 and PARK2 affect the mTOR signaling pathway, a major regulator of translation. This leads to altered ribosomal biogenesis and function [@pd-translation].

Alpha-synuclein toxicity: Alpha-synuclein aggregation, the hallmark pathology of PD, directly interferes with ribosomal function. Studies show that alpha-synuclein can bind to ribosomes and inhibit translation [@neurodegeneration-reviews].

ER stress and unfolded protein response: PD neurons experience chronic endoplasmic reticulum stress. The unfolded protein response (UPR) directly inhibits translation through phosphorylation of eIF2α, affecting ribosomal activity [@er-stress-ubiquitin].

mRNA surveillance failure: Quality control mechanisms for mRNA translation are compromised in PD, leading to production of aberrant proteins that contribute to aggregation pathology [@mrna-surveillance-nd].

Common Mechanisms Across Neurodegeneration

Several converging mechanisms link ribosomal dysfunction to neurodegeneration:

Expression Pattern

RPL13 is ubiquitously expressed across all tissues, including brain regions affected by neurodegeneration:

Cerebral cortex: High expression in pyramidal neurons
Hippocampus: Prominent in CA1 and CA3 regions
Substantia nigra: Moderate expression in dopaminergic neurons
Cerebellum: Present in Purkinje cells

The ubiquitous nature of RPL13 means that its dysfunction affects all cell types, though neurons may be particularly vulnerable due to their high metabolic demands and reliance on precise protein homeostasis.

Interactome

RPL13 interacts with multiple cellular pathways relevant to neurodegeneration:

Core Ribosomal Interactions

RPL5, RPL11: 60S assembly factors
RPS3, RPS7: 40S-60S subunit communication
eIF2, eIF3: Translation initiation complex

Stress Response Proteins

Hsp90: Molecular chaperone involved in protein folding
G3BP1: Stress granule formation marker
TIA-1: RNA granule component

Alpha-synuclein: PD pathology protein
Tau: AD pathology protein
ubiquitin: Proteostasis system component

Therapeutic Implications

Understanding ribosomal dysfunction in neurodegeneration opens therapeutic avenues:

Translation-modulating drugs: Small molecules that restore translation homeostasis

Stress granule modulators: Compounds that prevent pathological stress granule accumulation

mTOR inhibitors: Used at low doses to enhance translation fidelity

Autophagy enhancers: Restore protein clearance pathways

Synaptic protein synthesis boosters: Targeted approaches to restore synaptic function

Mermaid Diagram: Ribosomal Dysfunction in Neurodegeneration

Mermaid diagram (expand to render)

References

[RPL13 Gene - NCBI Gene](https://www.ncbi.nlm.nih.gov/gene/6142)

[RPL13 UniProt](https://www.uniprot.org/uniprot/P26373)

[Crystal structure of the eukaryotic ribosome](https://doi.org/10.1126/science.1190364)

[Translational dysregulation in Alzheimer's disease](https://doi.org/10.1016/j.neurobiolaging.2020.08.013)

[Ribosomal stress in Alzheimer's disease](https://doi.org/10.3233/JAD-210600)

[Stress granules and neurodegeneration](https://doi.org/10.1016/j.neuropharm.2020.108161)

[Dysregulated translation in Parkinson's disease](https://doi.org/10.1007/s12035-021-02175-5)

[Ribosome biogenesis dysfunction in Parkinson's disease](https://doi.org/10.3390/brainsci11030415)

[Protein homeostasis in neurodegenerative disease](https://doi.org/10.1016/j.tcb.2019.08.005)

[Mitochondrial ribosomal proteins in neurodegeneration](https://doi.org/10.1016/j.neurobiolaging.2019.01.012)

[ER stress, ubiquitin-proteasome system and neurodegeneration](https://doi.org/10.1007/s12035-020-01778-5)

[Translational control in neurodegeneration](https://doi.org/10.1016/j.tcb.2020.09.003)

[Ribosome dysfunction during aging and neurodegeneration](https://doi.org/10.1111/j.1474-9726.2020.00625.x)

[Local protein synthesis at synapses in neurodegeneration](https://doi.org/10.1016/j.neuropharm.2020.108256)

[mRNA surveillance pathways in neurodegeneration](https://doi.org/10.1093/nar/gkab123)

[Mechanisms of neurodegeneration](https://doi.org/10.1038/nature14539)

External Links

[NCBI Gene - RPL13](https://www.ncbi.nlm.nih.gov/gene/6142)
[UniProt - P26373](https://www.uniprot.org/uniprot/P26373)
[PubMed - RPL13](https://pubmed.ncbi.nlm.nih.gov/?term=RPL13+neurodegeneration)
[KEGG Ribosome Pathway](https://www.genome.jp/kegg/pathway/map03010)

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RPL13 — Ribosomal Protein L13

RPL13 — Ribosomal Protein L13

Overview

Introduction

RPL13 — Ribosomal Protein L13

Overview

Introduction

Molecular Function

Ribosomal Structure and Function

Extra-Ribosomal Functions

Role in Neurodegenerative Diseases

Alzheimer's Disease

Parkinson's Disease

Common Mechanisms Across Neurodegeneration

Expression Pattern

Interactome

Core Ribosomal Interactions

Stress Response Proteins

Disease-Related Proteins

Therapeutic Implications

Mermaid Diagram: Ribosomal Dysfunction in Neurodegeneration

See Also

Related Proteins

Related Pathways

Related Diseases

References

External Links