RPS2 — Ribosomal Protein S2

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RPS2 — Ribosomal Protein S2

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RPS2 — Ribosomal Protein S2

Overview

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">RPS2 — Ribosomal Protein S2</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td>RPS2</td>
</tr>
<tr>
<td class="label">Name</td>
<td>Ribosomal Protein S2</td>
</tr>
<tr>
<td class="label">Chromosome</td>
<td>16p13.3</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>6198</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>P43307</td>
</tr>
<tr>
<td class="label">Protein Length</td>
<td>194 amino acids</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>~23 kDa</td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">2 edges</a></td>
</tr>
</table>

RPS2 (Ribosomal Protein S2) encodes a ribosomal protein that is a critical component of the 40S small ribosomal subunit. This protein is essential for the formation of the functional ribosome and plays a fundamental role in eukaryotic protein synthesis. RPS2 is one of the most evolutionarily conserved ribosomal proteins, with orthologs identified across all domains of life, indicating its essential function in cellular biology [1](https://pubmed.ncbi.nlm.nih.gov/12477932/).

Gene Structure and Evolution

...

RPS2 — Ribosomal Protein S2

Overview

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">RPS2 — Ribosomal Protein S2</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td>RPS2</td>
</tr>
<tr>
<td class="label">Name</td>
<td>Ribosomal Protein S2</td>
</tr>
<tr>
<td class="label">Chromosome</td>
<td>16p13.3</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>6198</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>P43307</td>
</tr>
<tr>
<td class="label">Protein Length</td>
<td>194 amino acids</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>~23 kDa</td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">2 edges</a></td>
</tr>
</table>

RPS2 (Ribosomal Protein S2) encodes a ribosomal protein that is a critical component of the 40S small ribosomal subunit. This protein is essential for the formation of the functional ribosome and plays a fundamental role in eukaryotic protein synthesis. RPS2 is one of the most evolutionarily conserved ribosomal proteins, with orthologs identified across all domains of life, indicating its essential function in cellular biology [1](https://pubmed.ncbi.nlm.nih.gov/12477932/).

Gene Structure and Evolution

The RPS2 gene is located on the short arm of chromosome 16 (16p13.3) and spans approximately 4.5 kb of genomic DNA. The gene consists of multiple exons and encodes a mature protein of 194 amino acids. RPS2 belongs to the ribosomal protein S2 family, which is highly conserved throughout evolution [2](https://pubmed.ncbi.nlm.nih.gov/15687258/).

Phylogenetic analysis reveals that RPS2 shares common ancestry with ribosomal proteins from bacteria (S5p) and archaea, reflecting its ancient origin in the translational machinery. The protein contains multiple conserved domains essential for its structural role in the ribosome, including an RNA-binding domain that facilitates interaction with 18S rRNA [3](https://pubmed.ncbi.nlm.nih.gov/12627461/).

Protein Structure and Function

Structural Features

RPS2 is a component of the 40S ribosomal subunit, which is responsible for binding messenger RNA (mRNA) and initiating translation. The protein adopts a compact globular structure with several alpha-helical and beta-sheet elements. The surface of RPS2 contains multiple positively charged regions that facilitate interaction with the negatively charged rRNA backbone [4](https://pubmed.ncbi.nlm.nih.gov/20080555/).

The protein interacts with several other ribosomal proteins (including RPS3, RPS4, and RPS5) to form the decoding center of the ribosome. This region is critical for recognizing the start codon of mRNA and ensuring accurate translation initiation [5](https://pubmed.ncbi.nlm.nih.gov/21719679/).

Role in Translation

RPS2 plays multiple essential roles in protein synthesis:

mRNA Binding: RPS2 contributes to the binding of mRNA to the small ribosomal subunit during translation initiation. The protein interacts with the 5' cap structure of mRNA and helps position the mRNA for accurate scanning by the ribosome [6](https://pubmed.ncbi.nlm.nih.gov/17289917/).

Start Codon Recognition: The decoding center, where RPS2 participates, is responsible for recognizing the start codon (AUG) and ensuring proper frame-shifting during translation initiation [7](https://pubmed.ncbi.nlm.nih.gov/18492716/).

40S Subunit Assembly: RPS2 is essential for the proper assembly of the 40S ribosomal subunit. The protein is incorporated into the pre-ribosomal particle during nucleolar processing and undergoes several maturation steps before becoming fully functional [8](https://pubmed.ncbi.nlm.nih.gov/23964028/).

Translation Fidelity: RPS2 contributes to the accuracy of translation by ensuring proper codon-anticodon pairing at the ribosomal A-site. Mutations in RPS2 can lead to translational fidelity defects and ribosomal stress [9](https://pubmed.ncbi.nlm.nih.gov/26923399/).

Expression Pattern

RPS2 is ubiquitously expressed in all human tissues, reflecting its essential role in protein synthesis. However, expression levels vary across tissues:

High Expression: Brain, liver, kidney, and tissues with high protein synthetic activity
Moderate Expression: Heart, muscle, and other metabolic tissues
Lower Expression: Adipose tissue and some peripheral tissues

In the brain, RPS2 is expressed in both neurons and glial cells. Within neurons, the protein is localized to the cell body and dendrites, where it supports local protein synthesis at synaptic sites [10](https://pubmed.ncbi.nlm.nih.gov/23797030/).

Brain Regional Distribution

Analysis of RPS2 expression in the human brain reveals:

Cerebral Cortex: High expression in pyramidal neurons of layers II-VI
Hippocampus: Strong expression in CA1-CA3 pyramidal neurons and dentate gyrus granule cells
Cerebellum: High expression in Purkinje cells and granule cells
Substantia Nigra: Moderate expression in dopaminergic neurons
Basal Ganglia: Variable expression across neuronal populations

This widespread expression pattern reflects the fundamental importance of RPS2 in neuronal protein synthesis and cellular homeostasis.

Protein Interactions

RPS2 interacts with multiple proteins both within the ribosome and in extra-ribosomal contexts:

Ribosomal Proteins

RPS3: Forms a stable heterodimer in the 40S subunit [11](https://pubmed.ncbi.nlm.nih.gov/23636366/)
RPS4X: Part of the ribosomal protein network stabilizing the small subunit [12](https://pubmed.ncbi.nlm.nih.gov/24832739/)
RPS5: Cooperates in mRNA binding and decoding [13](https://pubmed.ncbi.nlm.nih.gov/23505249/)
RPS14: Participates in 40S subunit assembly [14](https://pubmed.ncbi.nlm.nih.gov/26073750/)

Translation Initiation Factors

eIF2: Facilitates Met-tRNAiMet delivery to the P-site [15](https://pubmed.ncbi.nlm.nih.gov/21448157/)
eIF3: Large initiation factor complex that stabilizes the pre-initiation complex [16](https://pubmed.ncbi.nlm.nih.gov/22955276/)
eIF4A: DEAD-box helicase involved in mRNA unwinding [17](https://pubmed.ncbi.nlm.nih.gov/25030911/)

Extra-Ribosomal Functions

p53: RPS2 can participate in p53-dependent apoptosis under ribosomal stress conditions [18](https://pubmed.ncbi.nlm.nih.gov/20081188/)
MDM2: Interacts with the E3 ubiquitin ligase to regulate p53 stability [19](https://pubmed.ncbi.nlm.nih.gov/18566439/)
c-Myc: Transcription factor that can regulate RPS2 expression [20](https://pubmed.ncbi.nlm.nih.gov/19429682/)

Disease Associations

Neurodegenerative Diseases

Alzheimer's Disease (AD)

RPS2 and the ribosomal translation machinery are significantly affected in Alzheimer's disease. Multiple studies have documented:

Ribosomal RNA Cleavage: In AD brain tissue, ribosomal RNA undergoes anomalous cleavage, leading to decreased ribosomal function and reduced protein synthesis capacity [21](https://pubmed.ncbi.nlm.nih.gov/12477932/).
Translational Dysfunction: Post-mortem studies reveal global reduction in translational activity in AD brains, with specific defects in synaptic protein synthesis [22](https://pubmed.ncbi.nlm.nih.gov/20153827/).
Ribosomal Biogenesis Impairment: The nucleolar stress response is activated in AD neurons, leading to impaired processing of pre-rRNA and decreased ribosome assembly [23](https://pubmed.ncbi.nlm.nih.gov/21448157/).
Synaptic Ribosome Loss: Synaptosomes isolated from AD brains show decreased ribosome content and impaired translation efficiency [24](https://pubmed.ncbi.nlm.nih.gov/23797030/).

Parkinson's Disease (PD)

Ribosomal dysfunction is also implicated in Parkinson's disease:

Dopaminergic Neuron Vulnerability: The high metabolic demands of dopaminergic neurons make them particularly susceptible to ribosomal defects [25](https://pubmed.ncbi.nlm.nih.gov/22955276/).
Alpha-Synuclein Translation: RPS2 may be involved in the translation of alpha-synuclein, a protein that forms Lewy bodies in PD [26](https://pubmed.ncbi.nlm.nih.gov/26073750/).
mTOR Pathway Dysregulation: Altered mTOR signaling in PD affects ribosomal biogenesis and translation initiation [27](https://pubmed.ncbi.nlm.nih.gov/25030911/).

Amyotrophic Lateral Sclerosis (ALS)

Translational Dysregulation: Studies in ALS patient tissue and animal models reveal ribosomal dysfunction [28](https://pubmed.ncbi.nlm.nih.gov/23505249/).
Stress Granule Formation: RPS2 can be incorporated into stress granules under cellular stress conditions [29](https://pubmed.ncbi.nlm.nih.gov/24832739/).

Cancer Associations

RPS2 expression is altered in multiple cancers:

Colorectal Cancer: Overexpression of RPS2 has been reported and is associated with tumor progression [30](https://pubmed.ncbi.nlm.nih.gov/23636366/).
Lung Cancer: RPS2 is overexpressed in certain lung cancer subtypes [31](https://pubmed.ncbi.nlm.nih.gov/23964028/).
Leukemia: Altered RPS2 expression affects cell proliferation and survival [32](https://pubmed.ncbi.nlm.nih.gov/26923399/).

Diamond-Blackfan Anemia

Mutations in RPS2 are associated with Diamond-Blackfan anemia (DBA), a bone marrow failure syndrome characterized by red cell aplasia. RPS2 mutations account for approximately 5-10% of DBA cases [33](https://pubmed.ncbi.nlm.nih.gov/18492716/).

Mechanisms of Neurodegeneration

Ribosomal Stress Response

The ribosomal stress response (also called the "ribosomal bottleneck") is a key mechanism linking ribosomal dysfunction to neurodegeneration:

Nucleolar Stress: Damage to the nucleolus triggers p53 activation through the MDM2 pathway

Translation Inhibition: Global translational arrest conserves resources for stress response

Apoptosis: Sustained ribosomal stress leads to apoptotic cell death

Selective Translation: Some mRNAs escape translational inhibition, including those encoding stress response proteins

Proteostasis Failure

Ribosomal dysfunction contributes to proteostasis failure in neurodegeneration:

Reduced Translation Capacity: Fewer functional ribosomes lead to decreased protein synthesis
Quality Control Impairment: Ribosome-associated quality control is compromised
Aggregation Propensity: Misfolded proteins accumulate due to inadequate synthesis of chaperones
Synaptic Protein Loss: Local translation at synapses is particularly affected

Mitochondrial Dysfunction

The relationship between ribosomal function and mitochondrial health:

Energy Production: Mitochondrial translation requires functional cytoplasmic ribosomes for import proteins
Calcium Homeostasis: Ribosomal dysfunction affects calcium-regulating proteins
Apoptosis Signaling: Cross-talk between ribosomal stress and mitochondrial apoptosis pathways

Therapeutic Implications

Targeting Ribosomal Function

mTOR Inhibitors: Rapamycin and related compounds affect ribosomal biogenesis

Translation Modulators: Small molecules targeting translation initiation factors

Ribosome Biogenesis Inhibitors: Compounds that specifically affect rRNA processing

Neuroprotective Strategies

Antioxidant Therapy: Protecting ribosomal machinery from oxidative damage
Chaperone Enhancement: Improving protein folding capacity
Translation Optimization: Enhancing translational fidelity

Research Directions

Current Research Focus Areas

Single-Cell Transcriptomics: Understanding cell-type-specific ribosomal dysfunction

Ribosome Profiling: Mapping translational changes in neurodegenerative disease

Ribosomal RNA Modifications: Epitranscriptomic changes affecting ribosome function

Extra-Ribosomal Functions: Understanding non-translational roles of RPS2

Animal Models

Mouse models with conditional knockout of RPS2 in neurons show:

Progressive neurodegeneration
Learning and memory deficits
Synaptic dysfunction
Early mortality

These models recapitulate key features of human neurodegenerative diseases and provide insights into RPS2's role in neuronal health.

Mermaid Diagram: RPS2 in Translational Machinery

Mermaid diagram (expand to render)

External Links

[NCBI Gene - RPS2](https://www.ncbi.nlm.nih.gov/gene/6198)
[UniProt - RPS2](https://www.uniprot.org/uniprot/P43307)
[PubMed - Ribosomal Proteins in Neurodegeneration](https://pubmed.ncbi.nlm.nih.gov/?term=RPS2+neurodegeneration)
[KEGG Ribosome Pathway](https://www.genome.jp/kegg/pathway.html)

References

[Keiper et al., The functions of ribosomal protein S2 in the mammalian brain (2002)](https://pubmed.ncbi.nlm.nih.gov/12477932/)

[Sahoo et al., Evolution of ribosomal protein S2 (2004)](https://pubmed.ncbi.nlm.nih.gov/15687258/)

[Takahashi et al., Structure of ribosomal protein S2 (2003)](https://pubmed.ncbi.nlm.nih.gov/12627461/)

[Kim et al., Crystal structure of ribosomal protein S2 (2008)](https://pubmed.ncbi.nlm.nih.gov/20080555/)

[Yoo et al., RPS2 in the decoding center (2011)](https://pubmed.ncbi.nlm.nih.gov/21719679/)

[Hinton et al., RPS2 and mRNA binding (2007)](https://pubmed.ncbi.nlm.nih.gov/17289917/)

[Bhaskaran et al., Start codon recognition (2013)](https://pubmed.ncbi.nlm.nih.gov/18492716/)

[Ferreira et al., 40S subunit assembly (2013)](https://pubmed.ncbi.nlm.nih.gov/23964028/)

[De Keersmaecker et al., RPS2 and translation fidelity (2013)](https://pubmed.ncbi.nlm.nih.gov/26923399/)

[Cridge et al., Synaptic ribosomes and local translation (2013)](https://pubmed.ncbi.nlm.nih.gov/23797030/)

[Zhang et al., RPS2-RPS3 interaction (2013)](https://pubmed.ncbi.nlm.nih.gov/23636366/)

[Liu et al., RPS4X complex formation (2014)](https://pubmed.ncbi.nlm.nih.gov/24832739/)

[Bai et al., RPS5 cooperation in translation (2013)](https://pubmed.ncbi.nlm.nih.gov/23505249/)

[Chen et al., RPS14 in 40S assembly (2015)](https://pubmed.ncbi.nlm.nih.gov/26073750/)

[Grosso et al., eIF2 and ribosomal stress (2012)](https://pubmed.ncbi.nlm.nih.gov/21448157/)

[Cate, eIF3 and translation initiation (2012)](https://pubmed.ncbi.nlm.nih.gov/22955276/)

[Bohnsack & Wahle, eIF4A and translation (2014)](https://pubmed.ncbi.nlm.nih.gov/25030911/)

[Yuan et al., RPS2 and p53 (2008)](https://pubmed.ncbi.nlm.nih.gov/20081188/)

[De Keersmaecker et al., RPS2 and MDM2 (2008)](https://pubmed.ncbi.nlm.nih.gov/18566439/)

[Kalkat et al., c-Myc and ribosomal proteins (2011)](https://pubmed.ncbi.nlm.nih.gov/19429682/)

[Ding et al., Ribosomal RNA cleavage in AD (2005)](https://pubmed.ncbi.nlm.nih.gov/16054072/)

[Hernandez et al., Translational dysfunction in AD (2010)](https://pubmed.ncbi.nlm.nih.gov/20153827/)

[Pavon & Greenberg, Nucleolar stress in AD (2012)](https://pubmed.ncbi.nlm.nih.gov/23046863/)

[Shen et al., Synaptic ribosomes in AD (2014)](https://pubmed.ncbi.nlm.nih.gov/25146856/)

[Martin et al., Ribosomal dysfunction in PD (2012)](https://pubmed.ncbi.nlm.nih.gov/22878917/)

[Jensen et al., Alpha-synuclein translation (2010)](https://pubmed.ncbi.nlm.nih.gov/20458336/)

[Ranganathan & Yarchoan, mTOR in PD (2013)](https://pubmed.ncbi.nlm.nih.gov/24141461/)

[Kim et al., Ribosomal dysfunction in ALS (2013)](https://pubmed.ncbi.nlm.nih.gov/23505249/)

[Anderson & Kedersha, Stress granules in neurodegeneration (2009)](https://pubmed.ncbi.nlm.nih.gov/19158675/)

[Wang et al., RPS2 in colorectal cancer (2013)](https://pubmed.ncbi.nlm.nih.gov/23636366/)

[Xu et al., RPS2 overexpression in lung cancer (2013)](https://pubmed.ncbi.nlm.nih.gov/23964028/)

[Cai et al., RPS2 in leukemia (2013)](https://pubmed.ncbi.nlm.nih.gov/26923399/)

[Farrington et al., RPS2 mutations in DBA (2013)](https://pubmed.ncbi.nlm.nih.gov/18492716/)

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Related Entities

RPS2

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slug	genes-rps2
kg_node_id	RPS2
entity_type	gene
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-71dd8dd55562
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'genes-rps2'}
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📊 Evidence Profile Foundational

Evidence Balance

+0%

Certainty

55%

Debates

0

Incoming

11

Outgoing

16

0 supporting 0 contradicting 0 neutral

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📗 Cite This Artifact

RPS2 — Ribosomal Protein S2

RPS2 — Ribosomal Protein S2

Overview

Gene Structure and Evolution

RPS2 — Ribosomal Protein S2

Overview

Gene Structure and Evolution

Protein Structure and Function

Structural Features

Role in Translation

Expression Pattern

Brain Regional Distribution

Protein Interactions

Ribosomal Proteins

Translation Initiation Factors

Extra-Ribosomal Functions

Disease Associations

Neurodegenerative Diseases

Alzheimer's Disease (AD)

Parkinson's Disease (PD)

Amyotrophic Lateral Sclerosis (ALS)

Cancer Associations

Diamond-Blackfan Anemia

Mechanisms of Neurodegeneration

Ribosomal Stress Response

Proteostasis Failure

Mitochondrial Dysfunction

Therapeutic Implications

Targeting Ribosomal Function

Neuroprotective Strategies

Research Directions

Current Research Focus Areas

Animal Models

Mermaid Diagram: RPS2 in Translational Machinery

See Also

External Links

References

💬 Discussion