RPL34 — Ribosomal Protein L34

RPL34 — Ribosomal Protein L34

<div class="infobox infobox-gene">
| | |
|---|---| [@rpl2019]
| Symbol | RPL34 | [@ribosomal2022]
| Name | Ribosomal Protein L34 | [@translational2021]
| Chromosome | 4q32.3 |
| NCBI Gene ID | 6165 |
| UniProt ID | P49207 |
| Gene Family | Ribosomal protein L34e |
| Expression | Ubiquitous, high in bone marrow, gastrointestinal tract |
</div>

Overview

RPL34 encodes Ribosomal Protein L34, a component of the large (60S) ribosomal subunit. Ribosomal proteins are essential for protein synthesis and play roles beyond translation, including ribosome biogenesis, cell cycle regulation, and [apoptosis](/entities/apoptosis). RPL34 has been studied primarily in the context of cancer biology, where it is frequently overexpressed, but emerging evidence suggests it may have roles in neuronal function and neurodegenerative disease.

Protein Structure

RPL34 is a member of the ribosomal protein L34e family found in eukaryotes. The protein:

• Contains approximately 117 amino acids
• Is located in the large ribosomal subunit (60S)
• Interacts with rRNA components (28S rRNA in eukaryotes)
• Has a conserved fold typical of ribosomal proteins

Expression and Regulation

Tissue Distribution

RPL34 is ubiquitously expressed with highest levels in:

• Bone marrow
• Gastrointestinal tract (esophagus, stomach, small intestine)
• Lymphoid tissues
• Placenta
• Brain (moderate expression in neurons)

Cellular Localization

...

RPL34 — Ribosomal Protein L34

<div class="infobox infobox-gene">
| | |
|---|---| [@rpl2019]
| Symbol | RPL34 | [@ribosomal2022]
| Name | Ribosomal Protein L34 | [@translational2021]
| Chromosome | 4q32.3 |
| NCBI Gene ID | 6165 |
| UniProt ID | P49207 |
| Gene Family | Ribosomal protein L34e |
| Expression | Ubiquitous, high in bone marrow, gastrointestinal tract |
</div>

Overview

RPL34 encodes Ribosomal Protein L34, a component of the large (60S) ribosomal subunit. Ribosomal proteins are essential for protein synthesis and play roles beyond translation, including ribosome biogenesis, cell cycle regulation, and [apoptosis](/entities/apoptosis). RPL34 has been studied primarily in the context of cancer biology, where it is frequently overexpressed, but emerging evidence suggests it may have roles in neuronal function and neurodegenerative disease.

Protein Structure

RPL34 is a member of the ribosomal protein L34e family found in eukaryotes. The protein:

• Contains approximately 117 amino acids
• Is located in the large ribosomal subunit (60S)
• Interacts with rRNA components (28S rRNA in eukaryotes)
• Has a conserved fold typical of ribosomal proteins

Expression and Regulation

Tissue Distribution

RPL34 is ubiquitously expressed with highest levels in:

• Bone marrow
• Gastrointestinal tract (esophagus, stomach, small intestine)
• Lymphoid tissues
• Placenta
• Brain (moderate expression in neurons)

Cellular Localization

• Cytoplasm: Primary location for ribosomal function
• Nucleolus: Site of ribosome biogenesis
• Mitochondria: Some evidence of mitochondrial localization

Transcriptional Regulation

RPL34 expression is regulated by:

• Cell proliferation signals (c-Myc can upregulate)
• p53 tumor suppressor
• [mTOR](/mechanisms/mtor-signaling-pathway) signaling pathway
• Cellular stress responses

Function in Protein Synthesis

Ribosome Assembly

RPL34 participates in:

Large subunit (60S) assembly

rRNA binding and stabilization

Peptidyl transferase center formation

Ribosome quality control

Translational Regulation

As a ribosomal protein, RPL34 directly affects:

• Translation initiation rates
• Elongation efficiency
• Termination fidelity
• Ribosome recycling

Role in Neurodegeneration

Ribosomal Dysfunction in Neurodegeneration

Ribosomal dysfunction is a hallmark of several neurodegenerative diseases:

Alzheimer's Disease ([AD](/diseases/alzheimers-disease))

• Reduced ribosomal RNA synthesis in AD brain
• Impaired translation in [neurons](/entities/neurons)
• RPL34 expression altered in AD models
• Ribosomal protein aggregates in AD plaques

Parkinson's Disease ([PD](/diseases/parkinsons-disease))

• Ribosomal biogenesis defects in PD models
• Translation impairment in dopaminergic neurons
• RPL34 dysregulation in PD brain
• Connection to [alpha-synuclein](/proteins/alpha-synuclein) toxicity

Amyotrophic Lateral Sclerosis ([ALS](/diseases/amyotrophic-lateral-sclerosis))

• Ribosomal protein alterations in ALS
• Translation dysregulation in motor neurons
• Stress granule formation involving ribosomal proteins
• RPL34 involvement in ALS models

Potential Mechanisms

RPL34 may contribute to neurodegeneration through:

Translation Defects

• Impaired protein synthesis
• Reduced stress response proteins
• Synaptic protein deficits

Ribosomal Stress

• Ribosome biogenesis stress
• p53 activation
• Apoptosis induction

Protein Aggregation

• Ribosomal proteins in inclusions
• Altered liquid-liquid phase separation

Energy Metabolism

• Mitochondrial dysfunction
• Reduced ATP production
• Metabolic stress

Cancer Association

RPL34 is frequently overexpressed in cancers:

• Prognostic marker in multiple tumor types
• Promotes cell proliferation
• Associated with poor prognosis

This has implications for understanding RPL34's dual role in cell survival and death.

Therapeutic Implications

Ribosome-Targeting Therapies

Several approaches target ribosomal function:

• mTOR inhibitors: Affect ribosomal biogenesis
• Ribosomal RNA modifiers: Impact translation
• Small molecule inhibitors: Target specific ribosomal proteins

Neuroprotective Strategies

Potential therapeutic approaches include:

Ribosomal stabilizers: Maintain translation

Stress response modulators: Enhance cell survival

Modulators of ribosomal protein expression: Restore balance

Antisense oligonucleotides: Target specific ribosomal proteins

See Also

• [Ribosome](/cell-types/ribosome)
• [Ribosomal Proteins](/proteins/ribosomal-proteins-family)
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Parkinson's Disease](/diseases/parkinsons-disease)
• [Amyotrophic Lateral Sclerosis](/diseases/amyotrophic-lateral-sclerosis)
• [Protein Synthesis](/mechanisms/protein-synthesis)
• [Translation](/mechanisms/translation)

External Links

• [NCBI Gene: RPL34](https://www.ncbi.nlm.nih.gov/gene/6165)
• [UniProt: P49207](https://www.uniprot.org/uniprot/P49207)
• [GeneCards: RPL34](https://www.genecards.org/cgi-bin/carddisp.pl?gene=RPL34)
• [PDB: Ribosomal proteins](https://www.rcsb.org/)
• [GTEx: RPL34 expression](https://gtexportal.org/)

References

[Unknown, Ribosomal proteins and their role in cell biology and disease. Journal of Cell Science, 2020 (2020)](https://doi.org/10.1242/jcs.246603)

[Unknown, Dysregulation of ribosomal proteins in neurodegenerative diseases. Cellular and Molecular Neurobiology, 2021 (2021)](https://doi.org/10.1007/s10571-021-01077-4)

[Unknown, RPL34 overexpression in cancer and its therapeutic implications. Oncotarget, 2019 (2019)](https://doi.org/10.18632/oncotarget.26789)

[Unknown, Ribosomal dysfunction in Alzheimer's disease. Acta Neuropathologica Communications, 2022 (2022)](https://doi.org/10.1186/s40478-022-01356-7)

[Unknown, Translational control in Parkinson's disease. Molecular Brain, 2021 (2021)](https://doi.org/10.1186/s13041-021-00779-4)