STIP1 Protein

STIP1 Protein

Introduction

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">STIP1 Protein</th>
</tr>
<tr>
<td class="label">Protein Name</td>
<td>STIP1 / HOP</td>
</tr>
<tr>
<td class="label">Gene</td>
<td>STIP1</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>Q9YLS8</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>~62.5 kDa (548 amino acids)</td>
</tr>
<tr>
<td class="label">Aliases</td>
<td>HOP, Hsp70/Hsp90 Organizer, STI1</td>
</tr>
<tr>
<td class="label">Tissue Specificity</td>
<td>Ubiquitous, high in brain</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/amyotrophic-lateral-sclerosis" style="color:#ef9a9a">Amyotrophic Lateral Sclerosis</a>, <a href="/wiki/ataxia" style="color:#ef9a9a">Ataxia</a>, <a href="/wiki/huntington" style="color:#ef9a9a">Huntington</a>, <a href="/wiki/lymphoma" style="color:#ef9a9a">Lymphoma</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">142 edges</a></td>
</tr>
</table>

Stip1 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

STIP1 Protein

Introduction

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">STIP1 Protein</th>
</tr>
<tr>
<td class="label">Protein Name</td>
<td>STIP1 / HOP</td>
</tr>
<tr>
<td class="label">Gene</td>
<td>STIP1</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>Q9YLS8</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>~62.5 kDa (548 amino acids)</td>
</tr>
<tr>
<td class="label">Aliases</td>
<td>HOP, Hsp70/Hsp90 Organizer, STI1</td>
</tr>
<tr>
<td class="label">Tissue Specificity</td>
<td>Ubiquitous, high in brain</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/amyotrophic-lateral-sclerosis" style="color:#ef9a9a">Amyotrophic Lateral Sclerosis</a>, <a href="/wiki/ataxia" style="color:#ef9a9a">Ataxia</a>, <a href="/wiki/huntington" style="color:#ef9a9a">Huntington</a>, <a href="/wiki/lymphoma" style="color:#ef9a9a">Lymphoma</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">142 edges</a></td>
</tr>
</table>

Stip1 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

STIP1 (Stress-Induced Phosphoprotein 1), also known as HOP (Hsp70/Hsp90 Organizing Protein), is a co-chaperone that bridges Hsp70 and Hsp90 molecular chaperones. STIP1 plays a crucial role in facilitating protein folding, assembly of protein complexes, and regulation of signaling pathways. It is essential for the Hsp90 chaperone system, which is critical for folding many client proteins involved in neurodegeneration [@blatch1997][@young1998].

Molecular Characteristics

Protein Structure

STIP1 contains multiple functional domains:

Normal Function

Chaperone System Coordination

STIP1 serves as a molecular adaptor:

• Hsp70-Hsp90 bridge — Simultaneous binding to both chaperones
• Client protein transfer — Facilitates hand-off from Hsp70 to Hsp90
• Hop-mediated folding — Coordinates folding of nascent and stressed proteins
• Complex assembly — Helps assemble multi-protein signaling complexes [@johnson1998]

Cellular Processes

STIP1 participates in:

• Steroid receptor maturation — Critical for glucocorticoid, estrogen receptors
• Kinase folding — Helps fold many signaling kinases
• Signal transduction — Regulates various signaling pathways
• Cell cycle control — Essential for cell division [@pratt2010]

Brain Functions

In the nervous system:

• Neuroprotection — Protects [neurons](/entities/neurons) from stress
• Synaptic function — Involved in synapse assembly
• Axonal transport — May assist in transport of chaperone complexes
• Response to injury — Upregulated after neuronal injury [@tutar2006]

Disease Associations

Alzheimer's Disease

STIP1 in AD:

• Interacts with [tau](/proteins/tau) protein and may influence [tau](/proteins/tau) pathology
• Hsp90-STIP1 complex regulates [tau](/proteins/tau) folding
• May be involved in [amyloid precursor protein](/entities/app-protein) processing
• Potential therapeutic target for tauopathies [@opattova2015]

Parkinson's Disease

In PD:

• May assist in [alpha-synuclein](/mechanisms/alpha-synuclein) handling
• Involved in LRRK2 protein quality control
• Protects dopaminergic neurons from stress
• Altered expression in PD brains [@daturpalli2013]

Cancer

STIP1 is often overexpressed in cancers:

• Supports growth of cancer cells
• Helps fold mutant oncoproteins
• Associated with poor prognosis
• Potential cancer therapy target [@song2017]

Interacting Partners

Key STIP1 interactions:

• Hsp70 (HSPA1A, HSPA8) — N-terminal TPR domain binding
• Hsp90 (HSP90AA1, HSP90AB1) — C-terminal TPR domain binding
• Hsp70/Hsp90 client proteins — Steroid receptors, kinases
• TPR-domain proteins — Other TPR-containing co-chaperones

Therapeutic Implications

Targeting STIP1:

• Inhibitors — Small molecules blocking Hsp90-STIP1 interaction
• Combination therapy — With Hsp90 or Hsp70 inhibitors
• Boosting function — Enhancing neuroprotection

See Also

• [Hsp70 Chaperone Family](/proteins/hsp70-family)
• [Hsp90 Chaperone Family](/proteins/hsp90-family)
• [Hsp40 Co-chaperones](/mechanisms/dnajc-proteins)
• [Chaperone Systems](/mechanisms/chaperone-systems)
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Parkinson's Disease](/diseases/parkinsons-disease)

Background

The study of Stip1 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.

External Links

• [UniProt Q9YLS8](https://www.uniprot.org/uniprot/Q9YLS8)
• [GeneCards STIP1](https://www.genecards.org/cgi-bin/carddisp.pl?gene=STIP1)
• [NCBI Gene 10963](https://www.ncbi.nlm.nih.gov/gene/10963)

References