RPL31 — Ribosomal Protein L31

RPL31 — Ribosomal Protein L31

Overview

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">RPL31 — Ribosomal Protein L31</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>RPL31</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>RPL31 — Ribosomal Protein L31</td>
</tr>
<tr>
<td class="label">Type</td>
<td>Gene</td>
</tr>
<tr>
<td class="label">NCBI</td>
<td><a href="https://www.ncbi.nlm.nih.gov/gene/?term=RPL31" target="_blank">Search NCBI</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">8 edges</a></td>
</tr>
</table>

RPL31 — Ribosomal Protein L31

Overview

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">RPL31 — Ribosomal Protein L31</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>RPL31</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>RPL31 — Ribosomal Protein L31</td>
</tr>
<tr>
<td class="label">Type</td>
<td>Gene</td>
</tr>
<tr>
<td class="label">NCBI</td>
<td><a href="https://www.ncbi.nlm.nih.gov/gene/?term=RPL31" target="_blank">Search NCBI</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">8 edges</a></td>
</tr>
</table>

RPL31 (Ribosomal Protein L31) is a component of the 60S large ribosomal subunit encoded by the RPL31 gene located on chromosome 2q14.1. This gene encodes a protein belonging to the L31E family of ribosomal proteins, which are essential for protein synthesis and have been increasingly recognized for their roles in extraribosomal functions including cellular stress response, apoptosis, and disease pathogenesis["warner2009"].

RPL31 is ubiquitously expressed across human tissues, with particularly important functions in rapidly dividing cells and energy-demanding tissues such as the brain. Recent research has identified RPL31 mutations as a cause of Diamond-Blackfan anemia (DBA), expanding the spectrum of ribosomal protein genes implicated in ribosomopathies["hetzel2016"]. Additionally, ribosomal protein dysfunction is increasingly recognized as a contributor to neurodegenerative diseases including Alzheimer's disease and Parkinson's disease["yoshikawa2021"][@liu2020].

Gene and Protein Structure

Gene Organization

The RPL31 gene spans approximately 4.5 kb on chromosome 2q14.1 and consists of 5 exons. The gene encodes a protein of 125 amino acids with a molecular weight of approximately 14 kDa. The protein contains a characteristic L31E domain found in eukaryotic ribosomal proteins[dekeersmaecker2015].

Protein Structure

RPL31 is a component of the large (60S) ribosomal subunit where it plays structural and functional roles:

• N-terminal domain: Involved in rRNA binding, particularly interactions with 28S rRNA
• C-terminal region: Contributes to the peptidyl transferase center
• Zinc finger motif: Some RPL31 variants contain CCHC-type zinc finger domains involved in RNA binding
• Surface residues: Interact with translation factors and other ribosomal proteins

Function in Protein Synthesis

Ribosomal Function

As a component of the 60S ribosomal subunit, RPL31 contributes to multiple aspects of translation:

Extraribosomal Functions

Beyond translation, RPL31 has been implicated in several cellular processes:

p53 Pathway Regulation: RPL31 can interact with MDM2 and contribute to p53 stability, linking ribosomal stress to cell cycle control and apoptosis[ding2005]. This connection is particularly relevant in ribosomopathies where ribosomal stress activates p53-mediated growth arrest.

DNA Damage Response: Some studies suggest RPL31 may be recruited to sites of DNA damage, potentially participating in DNA repair processes[gauthier2023].

Cell Cycle Regulation: Through p53-dependent and independent pathways, RPL31 can influence cell proliferation and survival[dekeersmaecker2015].

Expression Pattern

Tissue Distribution

RPL31 demonstrates ubiquitous expression across all human tissues:

• Highest expression: Bone marrow, spleen, testis
• Moderate expression: Brain, heart, liver, kidney
• Lower expression: Muscle, lung

Brain Expression

In the central nervous system, RPL31 is expressed in:

• Neurons: High expression in pyramidal neurons of the hippocampus and cerebral cortex
• Glial cells: Moderate expression in astrocytes and microglia
• Synapses: Presence in the postsynaptic density suggests roles in local protein synthesis at synapses[khodorov2002]

Role in Neurodegeneration

Alzheimer's Disease

RPL31 dysregulation has been observed in Alzheimer's disease through several mechanisms:

Parkinson's Disease

In Parkinson's disease, RPL31 connections include:

Amyotrophic Lateral Sclerosis

In ALS:

Disease Associations

Diamond-Blackfan Anemia

RPL31 has been identified as a novel gene associated with Diamond-Blackfan anemia (DBA), a rare inherited bone marrow failure syndrome characterized by:

• Macrocytic anemia
• Reticulocytopenia
• Congenital anomalies (in some cases)
• Increased risk of leukemia

Cancer Biology

Altered RPL31 expression has been reported in several cancers:

• Colorectal cancer: RPL31 silencing affects progression through DEPDC1
• Prostate cancer: RPL31 modulates cell growth via p53 pathway
• Breast cancer: RPL31 overexpression correlated with prognosis

Therapeutic Implications

Ribosome-Targeting Approaches

Understanding RPL31 function has inspired therapeutic strategies:

Neuroprotective Strategies

Potential therapeutic approaches for neurodegeneration include:

Ribosomopathy Treatment

For DBA and related conditions:

• Corticosteroids (first-line treatment)
• L-leucine (amino acid that can stimulate translation)
• Red blood cell transfusions
• Hematopoietic stem cell transplantation (curative)[narla2010]

See Also

• [Ribosomal Proteins](/proteins/ribosomal-proteins)
• [Protein Synthesis](/mechanisms/protein-synthesis)
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Parkinson's Disease](/diseases/parkinsons-disease)
• [Diamond-Blackfan Anemia](/diseases/diamond-blackfan-anemia)

References