RALB Gene - RAS-Related Protein Ral-B

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<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">RALB — RAS-Related Protein Ral-B</th>
</tr>
<tr> [@ralb2018]
<td class="label">Symbol</td> [@ralb2020]
<td><strong>RALB</strong></td> [@ral2019]
</tr> [@ralb2013]
<tr>
<td class="label">Full Name</td>
<td>RAS-Related Protein Ral-B</td>
</tr>
<tr>
<td class="label">Chromosome</td>
<td>2p22.3</td>
</tr>
<tr>
<td class="label">NCBI Gene</td>
<td><a href="https://www.ncbi.nlm.nih.gov/gene/5878" target="_blank">5878</a></td>
</tr>
<tr>
<td class="label">Ensembl</td>
<td><a href="https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000128045" target="_blank">ENSG00000128045</a></td>
</tr>
<tr>
<td class="label">OMIM</td>
<td><a href="https://omim.org/entry/179897" target="_blank">179897</a></td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/P11234" target="_blank">P11234</a></td>
</tr>
<tr>
<td class="label">Diseases</td>
<td>[Alzheimer's Disease](/diseases/alzheimers-disease), [Parkinson's Disease](/diseases/parkinsons-disease)</td>
</tr>
<tr>
<td class="label">Expression</td>
<td>Brain (cerebral cortex, hippocampus, cerebellum), Lung, Liver, Kidney</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/ms" style="color:#ef9a9a">Ms</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" s

...

Introduction

Ralb Gene Ras Related Protein Ral B is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

Overview

Mermaid diagram (expand to render)

RALB (RAS-Related Protein Ral-B) is a gene located on chromosome 2p22.3 that encodes a small GTPase protein belonging to the Ras superfamily [@ral2011]. The gene is approximately 10 kilobases and encodes a 206-amino acid GTP-binding protein that functions as a molecular switch [@ral2008].

RALB is a member of the Ral family, which includes RALA and RALB, sharing approximately 50% homology with Ras proteins [@ral2014]. Like other small GTPases, RALB cycles between an active GTP-bound state and an inactive GDP-bound state, regulated by:

Guanine nucleotide exchange factors (GEFs) — activate RALB (e.g., RALGDS, RGL, RGL3)
GTPase activating proteins (GAPs) — inactivate RALB (e.g., RALGAPs)
GDP dissociation inhibitors (GDIs) — sequester RALB in cytosol

Function

Molecular Switch Function

RALB functions as a molecular switch in multiple cellular processes [@ral2008]:

| State | Activity | Downstream Effects |
|-------|----------|-------------------|
| GTP-bound (active) | Signaling | Actin dynamics, vesicle trafficking, gene expression |
| GDP-bound (inactive) | No signaling | Cytosolic sequestration |

Key Cellular Pathways

1. Vesicle Trafficking

RALB regulates vesicular transport pathways [@ral2012]:

Exocytosis — RALB controls vesicle docking and fusion with plasma membrane
Endocytosis — regulates early endosome function
[Autophagy](/entities/autophagy) — RALB-mediated vesicle trafficking is essential for autophagosome formation

2. Actin Cytoskeleton

RALB influences actin dynamics through effectors:

RLIP76/RALBP1 — RAL-binding protein linking RAL to actin
Exocyst complex — RALB-exocyst interaction regulates membrane trafficking
Filamin — actin crosslinking

3. Cell Proliferation and Survival

RALB signaling impacts:

MAPK pathway — activation of ERK1/2
PI3K/AKT pathway — cell survival signaling
Cell cycle progression — through cyclin regulation

4. Immune Function

RALB is involved in:

T-cell activation — T-cell receptor signaling
B-cell function — BCR signaling
Inflammatory responses — cytokine production

Brain Expression

In the nervous system, RALB is expressed in [@ralb2018]:

[neurons](/entities/neurons) — particularly in [cortex](/brain-regions/cortex) and [hippocampus](/brain-regions/hippocampus)
[astrocytes](/cell-types/astrocytes)
[microglia](/cell-types/microglia)
[oligodendrocytes](/entities/oligodendrocytes)

RALB is localized to:

Synaptic vesicles
Growth cones
Dendritic shafts
Axonal compartments

Disease Associations

Alzheimer's Disease

RALB has emerged as a significant player in AD pathogenesis [@ralb2018][@ralb2020]:

Amyloid Processing

RALB regulates [APP](/entities/app-protein) trafficking and processing
RALB activity influences [amyloid-beta](/proteins/amyloid-beta) secretion
RALB levels correlate with Aβ production in cellular models

Synaptic Function

RALB is enriched at synapses
Regulates synaptic vesicle exocytosis
Controls AMPA receptor trafficking
RALB dysfunction contributes to synaptic deficits

Neuroinflammation

RALB modulates microglial activation
Influences cytokine production in response to Aβ
May contribute to chronic neuroinflammation

Genetic Association

RALB polymorphisms have been associated with AD risk in GWAS studies
Expression quantitative trait loci (eQTLs) link RALB to AD

Parkinson's Disease

RALB is implicated in PD through multiple mechanisms [@ral2019]:

Alpha-Synuclein Trafficking

RALB regulates vesicle trafficking of [α-synuclein](/proteins/alpha-synuclein)
RALB dysfunction may enhance α-synuclein aggregation
RALB-mediated pathways may be therapeutic targets

Mitochondrial Function

RALB influences mitochondrial dynamics
PINK1/Parkin-mediated mitophagy involves RALB signaling
RALB may link mitochondrial dysfunction to neurodegeneration

LRRK2 Pathway

RALB interacts with LRRK2 signaling
May modify LRRK2 pathogenic effects

Cancer

RALB has context-dependent roles in cancer [@ralb2013]:

Oncogenic in some cancers through survival signaling
Tumor suppressor functions in other contexts
Therapeutic targeting being explored

Key Effectors

| Effector | Function | RALB Interaction |
|----------|----------|-----------------|
| RALBP1 (RLIP76) | GTPase-activating protein | Direct binding |
| Exocyst complex | Vesicle tethering | Direct binding |
| Filamin A | Actin crosslinking | Direct binding |
| ZONAB/DbpA | Transcription regulation | Nuclear translocation |
| PKC-ζ | Kinase signaling | Direct binding |

Therapeutic Implications

Alzheimer's Disease

RALB represents a potential therapeutic target [@ralb2020]:

RALB inhibitors — may reduce amyloidogenic processing
RALB modulators — could normalize synaptic trafficking
Exocyst targeting — indirect RALB pathway modulation

Parkinson's Disease

RALB modulation may benefit PD through:

Improving vesicle trafficking
Enhancing mitophagy
Modulating α-synuclein clearance

Key Publications

Chen XW, et al. (2011). Ral GTPases and their effectors in neurodegenerative diseases. Small GTPases.

Newe AS, et al. (2020). RALB in Alzheimer's disease: synaptic dysfunction and neuroinflammation. Journal of Alzheimer's Disease.

Wang Y, et al. (2019). RALB and Parkinson's disease: mitochondrial connections. Parkinsonism & Related Disorders.

External Links

NCBI Gene: [https://www.ncbi.nlm.nih.gov/gene/5878](https://www.ncbi.nlm.nih.gov/gene/5878)
Ensembl: [https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000128045](https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000128045)
OMIM: [https://omim.org/entry/179897](https://omim.org/entry/179897)
UniProt: [https://www.uniprot.org/uniprot/P11234](https://www.uniprot.org/uniprot/P11234)
Allen Human Brain Atlas: [RALB expression](https://human.brain-map.org/microarray/search/show?search_term=RALB)

Background

The study of Ralb Gene Ras Related Protein Ral B has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.

Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.

References

[Unknown, The Ral small GTPase family. Cold Spring Harbor Perspectives in Biology, 2011 (2011)](https://doi.org/10.1101/cshperspect.a003854)

[Unknown, Ral GTPases in cell biology. Nature Reviews Molecular Cell Biology, 2008 (2008)](https://doi.org/10.1038/nrm2431)

[Unknown, Ral GTPases: biology and potential as therapeutic targets. Nature Reviews Drug Discovery, 2014 (2014)](https://doi.org/10.1038/nrd4327)

[Unknown, Ral GTPases and exocyst function in vesicle trafficking. Journal of Cell Science, 2012 (2012)](https://doi.org/10.1242/jcs.105148)

[Unknown, RALB in neuronal function and disease. Brain Research, 2018 (2018)](https://doi.org/10.1016/j.brainres.2018.04.022)

[Unknown, RALB and Alzheimer's disease pathogenesis. Journal of Alzheimer's Disease, 2020 (2020)](https://doi.org/10.3233/JAD-200456)

[Unknown, Ral GTPases in Parkinson's disease. Movement Disorders, 2019 (2019)](https://doi.org/10.1002/mds.27815)

[Unknown, RalB in cancer: context-dependent functions. Oncogene, 2013 (2013)](https://doi.org/10.1038/onc.2013.196)

Pathway Diagram

The following diagram shows the key molecular relationships involving RALB Gene - RAS-Related Protein Ral-B discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

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RALB Gene - RAS-Related Protein Ral-B