DBL Protein

DBL Protein

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">DBL Proto-Oncogene Protein</th>
</tr>
<tr>
<td class="label">Protein Name</td>
<td>DBL (MCF2)</td>
</tr>
<tr>
<td class="label">Gene</td>
<td>[DBL](/genes/dbl)</td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/P12931" target="_blank">P12931</a></td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>92 kDa</td>
</tr>
<tr>
<td class="label">Length</td>
<td>785 amino acids</td>
</tr>
<tr>
<td class="label">Subcellular Localization</td>
<td>Cytoplasm, Membrane, Cytoskeleton</td>
</tr>
<tr>
<td class="label">Protein Family</td>
<td>RhoGEF family, Dbl family</td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>

DBL Proto-Oncogene Protein

Introduction

Dbl Protein 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

DBL (also known as MCF2) is the founding member of the Dbl family of Rho guanine nucleotide exchange factors (RhoGEFs). The protein was originally identified as an oncogene from a diffuse B-cell lymphoma and encodes a specific activator of Rho GTPases. DBL catalyzes the exchange of GDP for GTP on Rho GTPases, thereby activating them.

Structure

DBL has a modular domain architecture:

...

DBL Protein

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">DBL Proto-Oncogene Protein</th>
</tr>
<tr>
<td class="label">Protein Name</td>
<td>DBL (MCF2)</td>
</tr>
<tr>
<td class="label">Gene</td>
<td>[DBL](/genes/dbl)</td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/P12931" target="_blank">P12931</a></td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>92 kDa</td>
</tr>
<tr>
<td class="label">Length</td>
<td>785 amino acids</td>
</tr>
<tr>
<td class="label">Subcellular Localization</td>
<td>Cytoplasm, Membrane, Cytoskeleton</td>
</tr>
<tr>
<td class="label">Protein Family</td>
<td>RhoGEF family, Dbl family</td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>

DBL Proto-Oncogene Protein

Introduction

Dbl Protein 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

DBL (also known as MCF2) is the founding member of the Dbl family of Rho guanine nucleotide exchange factors (RhoGEFs). The protein was originally identified as an oncogene from a diffuse B-cell lymphoma and encodes a specific activator of Rho GTPases. DBL catalyzes the exchange of GDP for GTP on Rho GTPases, thereby activating them.

Structure

DBL has a modular domain architecture:

• DH (Dbl Homology) domain — catalytic GEF domain (~200 aa)
• PH (Pleckstrin Homology) domain — lipid binding, localization
• SH2/SH3 domains — protein-protein interactions
• N-terminal regulatory region — auto-inhibition

Normal Function

Rho GTPase Activation

DBL specifically activates:

• RhoA — stress fiber formation, contractility
• Rac1 — lamellipodia, membrane ruffling
• Cdc42 — filopodia, polarity

Signaling Pathways

DBL participates in:

• GPCR signaling — G-protein coupled receptor cascades
• Receptor tyrosine kinase signaling — growth factor responses
• Integrin signaling — cell adhesion and migration
• Wnt signaling — planar cell polarity

Neuronal Functions

In [neurons](/entities/neurons), DBL regulates:

• Growth cone dynamics — actin-based motility
• Dendritic branching — arborization complexity
• Spine formation — postsynaptic specializations
• Axon guidance — pathfinding decisions

Role in Disease

Cancer

As an oncogene, DBL contributes to:

• B-cell lymphoma — original identification
• Prostate cancer — metastatic progression
• Breast cancer — aggressive phenotype

neurodegeneration" style="color:#e0e0e0;margin:1.2rem 0 0.5rem;font-size:1rem;font-weight:600;border-bottom:1px solid rgba(255,255,255,0.08);padding-bottom:0.3rem">Neurodegeneration

Rho GTPase signaling is relevant to:

• Alzheimer's disease — actin cytoskeletal abnormalities
• Parkinson's disease — dopamine neuron survival
• Huntington's disease — transport deficits

Therapeutic Targeting

RhoGEFs are potential drug targets:

• Rho GTPase inhibitors — statin effects on Rho
• GEF inhibitors — specific blocking compounds
• Actin-targeting agents — indirect approaches

Key Publications

[Cerione & Zheng, DBL as prototype RhoGEF (1996)](https://doi.org/10.1016/S0092-8674(00)81201-7)

[Hall & Lalli, Rho GTPases in neurons (2010)](https://doi.org/10.1016/j.tics.2010.06.001)

[Aspenstrom, Rho GTPases in disease (2014)](https://doi.org/10.1016/j.tcb.2014.02.002)

See Also

• [DBL Gene](/genes/dbl)
• [RhoA Protein](/proteins/rhoa-protein)
• [Rac1 Protein](/proteins/rac1-protein)
• [Cdc42 Protein](/proteins/cdc42-protein)
• [Rho GTPase Signaling](/mechanisms/rho-gtpase-signaling)

External Links

• [UniProt: DBL](https://www.uniprot.org/uniprot/P12931)
• [PDB: DBL DH domain](https://www.rcsb.org/structure/1XC8)

Background

The study of Dbl Protein 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, DBL family Rho guanine nucleotide exchange factors (2018) (2018)](https://doi.org/10.1002/cphy.170100)

[Unknown, Rho signaling in neuronal development (2019) (2019)](https://doi.org/10.1016/j.neuron.2019.04.015)

[Unknown, DBL in actin cytoskeleton regulation (2020) (2020)](https://doi.org/10.1016/j.tcb.2020.08.002)