Tumor Protein P53

Tumor Protein P53

Introduction

Tumor Protein P53 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

<div class="infobox infobox-protein"> [@lanni2012]
<table> [@simao2021]
<tr><th colspan="2" style="background:#4477AA; color:white; text-align:center">TP53</th></tr> [@tedesco2023]
<tr><th>Protein Name</th><td>Tumor Protein P53 (Cellular Tumor Antigen P53)</td></tr> [@wadhwa2020]
<tr><th>Gene</th><td>[TP53](/genes/tp53)</td></tr>
<tr><th>UniProt ID</th><td>[P04637](https://www.uniprot.org/uniprot/P04637)</td></tr>
<tr><th>PDB IDs</th><td>1TUP, 1H26, 2OCJ</td></tr>
<tr><th>Molecular Weight</th><td>43.7 kDa</td></tr>
<tr><th>Subcellular Localization</th><td>Nucleus (transcription factor)</td></tr>
<tr><th>Protein Family</th><td>P53 Family (Trp53)</td></tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">ALS</a>, <a href="/wiki/als/ftd" style="color:#ef9a9a">ALS/FTD</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">ALZHEIMER</a>, <a href="/wiki/alzheimer's-disease" style="color:#ef9a9a">ALZHEIMER'S DISEASE</a>, <a href="/wiki/aging" style="color:#ef9a9a">Aging</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">2043 edges</a></td>
</tr>
</table>
</div>

Structure

Tumor Protein P53

Introduction

Tumor Protein P53 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

<div class="infobox infobox-protein"> [@lanni2012]
<table> [@simao2021]
<tr><th colspan="2" style="background:#4477AA; color:white; text-align:center">TP53</th></tr> [@tedesco2023]
<tr><th>Protein Name</th><td>Tumor Protein P53 (Cellular Tumor Antigen P53)</td></tr> [@wadhwa2020]
<tr><th>Gene</th><td>[TP53](/genes/tp53)</td></tr>
<tr><th>UniProt ID</th><td>[P04637](https://www.uniprot.org/uniprot/P04637)</td></tr>
<tr><th>PDB IDs</th><td>1TUP, 1H26, 2OCJ</td></tr>
<tr><th>Molecular Weight</th><td>43.7 kDa</td></tr>
<tr><th>Subcellular Localization</th><td>Nucleus (transcription factor)</td></tr>
<tr><th>Protein Family</th><td>P53 Family (Trp53)</td></tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">ALS</a>, <a href="/wiki/als/ftd" style="color:#ef9a9a">ALS/FTD</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">ALZHEIMER</a>, <a href="/wiki/alzheimer's-disease" style="color:#ef9a9a">ALZHEIMER'S DISEASE</a>, <a href="/wiki/aging" style="color:#ef9a9a">Aging</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">2043 edges</a></td>
</tr>
</table>
</div>

Structure

P53 is a transcription factor containing several distinct domains:

• N-terminal Transactivation Domain (TAD): Contains two subdomains (TAD1, TAD2) for transcriptional activation
• Proline-Rich Domain (PRD): Mediates protein-protein interactions
• Central DNA-Binding Domain (DBD): Binds to p53 response elements (p53 RE) as a tetramer
• Oligomerization Domain (OD): Forms tetramers essential for DNA binding
• C-terminal Regulatory Domain (CTD): Modulates DNA binding and contains nuclear localization signals

Normal Function

P53 is the "guardian of the genome" and functions as a critical tumor suppressor:

• Cell Cycle Arrest: Activates p21 to halt cell cycle progression
• [Apoptosis](/entities/apoptosis): Induces pro-apoptotic genes (BAX, PUMA, NOXA)
• DNA Repair: Upregulates DNA repair proteins
• Senescence: Induces cellular senescence programs
• Metabolism: Modulates glycolysis and oxidative phosphorylation
• Stem Cell Regulation: Maintains stem cell populations

Expression Pattern

P53 expression is ubiquitous but regulated:

• Brain: [Neurons](/entities/neurons) and glia express p53 at baseline levels
• Neurons: Higher expression in hippocampal and cortical neurons
• Glia: Inducible expression in [astrocytes](/entities/astrocytes) and [microglia](/entities/microglia)
• Development: Low expression during development, increases with stress

Role in Neurodegeneration

P53 plays complex roles in neurodegeneration:

Alzheimer's Disease

• Elevated in AD brains
• Mediates [Aβ](/proteins/amyloid-beta)-induced neuronal apoptosis
• Links amyloid pathology to neuronal death
• DNA damage accumulation activates p53

Parkinson's Disease

• Involved in dopaminergic neuron apoptosis
• Mediates mitochondrial dysfunction pathways
• Activated by oxidative stress

ALS

• Motor neuron vulnerability associated with p53
• Mutant SOD1 induces p53 activation
• Therapeutic targeting under investigation

Huntington's Disease

• Mutant [huntingtin](/proteins/huntingtin-protein) activates p53
• Contributes to striatal neuron death
• DNA damage response dysregulation

Stroke/Ischemia

• Major mediator of ischemic neuronal death
• Therapeutic target for neuroprotection

Therapeutic Implications

Drug Development

• P53 Inhibitors: For acute neuroprotection (pifithrin-α)
• Mdm2 Inhibitors: Activate p53 for anti-cancer, potential for neurodegeneration
• Gene Therapy: Limited by dual nature of p53

Clinical Considerations

• Chronic p53 activation may be detrimental
• Acute vs. chronic targeting differs
• Balancing pro-survival and pro-death functions

Research Directions

Background

The study of Tumor Protein P53 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.

Pathway & Interaction Diagram

Interactive diagram showing P53's key relationships in the SciDEX knowledge graph (15 connections shown).

See Also

• TP53 Gene - Gene page for TP53
• Apoptosis Pathways - Apoptosis mechanisms
• [Alzheimer's Disease](/diseases/alzheimers- [Parkinson's Disease](/diseases/parkinsons-disease)isease
• [Parkinson's Disease](/diseases/parkinsons-disease) Parkinson's disease
• Cancer - Cancer

External Links

• [UniProt: P04637](https://www.uniprot.org/uniprot/P04637) - TP53 protein entry
• [NCBI Gene: 7157](https://www.ncbi.nlm.nih.gov/gene/7157) - TP53 gene database
• [PDB: 1TUP](https://www.rcsb.org/structure/1TUP) - p53 DNA-binding domain

References