STUB1 — CHIP

STUB1 — CHIP

Pathway Diagram

STUB1 — CHIP

Pathway Diagram

<table class="infobox infobox-gene">
<tr><th class="infobox-header" colspan="2">STUB1</th></tr>
<tr><td class="label">Full Name</td><td>STIP1 Homology And U-Box Containing Protein 1</td></tr>
<tr><td class="label">Chromosome</td><td>16p13.3</td></tr>
<tr><td class="label">NCBI Gene ID</td><td><a href="https://www.ncbi.nlm.nih.gov/gene/10273" target="_blank">10273</a></td></tr>
<tr><td class="label">Ensembl ID</td><td>ENSG00000120539</td></tr>
<tr><td class="label">OMIM ID</td><td>607207</td></tr>
<tr><td class="label">UniProt ID</td><td><a href="https://www.uniprot.org/uniprot/Q9UNE7" target="_blank">Q9UNE7</a></td></tr>
<tr><td class="label">Associated Diseases</td><td>[ALS](/diseases/als), [Parkinson's Disease](/diseases/parkinsons-disease), Spinocerebellar Ataxia, Hereditary Spastic Paraplegia</td></tr>
</table>

STUB1 — CHIP (STIP1 Homology And U-Box Containing Protein 1)

Introduction

Stub1 — Chip 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

STUB1 (also known as CHIP - C-terminus of HSC70-Interacting Protein) encodes a ubiquitin ligase and cochaperone that plays critical roles in protein quality control. It acts at the interface between chaperone-mediated folding and ubiquitin-proteasome degradation.

Function

CHIP (STUB1) is a multifunctional protein that bridges the chaperone and ubiquitin-proteasome systems. Its primary functions include:

Ubiquitin Ligase Activity

• E3 ubiquitin ligase: Catalyzing the transfer of ubiquitin to substrate proteins
• U-box domain: Mediating interaction with E2 ubiquitin-conjugating enzymes
• Chaperone clients: Targeting misfolded chaperone clients for degradation

Cochaperone Function

• HSP70/HSP90 interaction: Binding to [heat shock proteins](/entities/heat-shock-proteins) via TPR domain
• Folding vs. degradation decision: Determining whether proteins are refolded or degraded
• Protein triage: Deciding the fate of damaged proteins

Cellular Stress Response

• Heat shock response: Regulating HSF1 and heat shock gene expression
• Oxidative stress: Protecting against oxidative damage
• ER stress: Participating in ER-associated degradation

Neuronal Functions

• Protein quality control: Clearing aggregated proteins in [neurons](/entities/neurons)
• Synaptic maintenance: Supporting synaptic protein turnover
• Neuroprotection: Protecting neurons from proteotoxic stress

Disease Associations

Amyotrophic Lateral Sclerosis (ALS)

CHIP is involved in ALS pathogenesis:

• SOD1 degradation: Promoting clearance of mutant SOD1
• [TDP-43](/proteins/tdp-43) regulation: Targeting [TDP-43](/mechanisms/tdp-43-proteinopathy) aggregates
• Neuroprotection: Reducing motor neuron stress

Parkinson's Disease

CHIP has protective roles in PD:

• [Alpha-synuclein](/proteins/alpha-synuclein) clearance: Promoting degradation of toxic [alpha-synuclein](/mechanisms/alpha-synuclein)
• Parkin interaction: Working with Parkin in mitophagy
• Dopaminergic neuron protection: Preserving dopaminergic neurons

Spinocerebellar Ataxia

STUB1 mutations cause spinocerebellar ataxia type 16 (SCA16):

• Cerebellar degeneration: Progressive ataxia
• Cognitive involvement: Variable cognitive decline
• Autosomal recessive inheritance: Biallelic mutations

Gordon Holmes Syndrome

Mutations in STUB1 cause Gordon Holmes syndrome:

• Hypogonadotropic hypogonadism: Reproductive dysfunction
• Ataxia: Progressive cerebellar ataxia
• Dementia: Cognitive decline

Pathogenic Mechanisms

Expression

CHIP is ubiquitously expressed with high levels in:

• Brain (neurons)
• Skeletal muscle
• Heart
• Testis

• Purkinje cells
• Motor neurons
• Hippocampal neurons

Key Publications

See Also

• [Amyotrophic Lateral Sclerosis](/diseases/als)
• [Parkinson's Disease](/diseases/parkinsons-disease)
• [Ubiquitin-Proteasome System](/mechanisms/ubiquitin-proteasome-system)
• [Protein Misfolding](/mechanisms/protein-misfolding)

External Links

• [NCBI Gene: STUB1](https://www.ncbi.nlm.nih.gov/gene/10273)
• [UniProt: Q9UNE7](https://www.uniprot.org/uniprot/Q9UNE7)
• [OMIM: 607207](https://www.omim.org/entry/607207)

Background

The study of Stub1 — Chip 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.

Brain Atlas Resources

Allen Brain Atlas

• [Allen Human Brain Atlas](https://human.brain-map.org/): Gene expression data
• [Allen Cell Type Atlas](https://celltype.brain-map.org/): Cell type-specific expression
• [BrainSpan Atlas](https://brainspan.org/): Developmental transcriptome data

References

Pathway Diagram

The following diagram shows the key molecular relationships involving STUB1 — CHIP discovered through SciDEX knowledge graph analysis: