PIN1 Protein (Peptidyl-Prolyl Cis-Trans Isomerase NIMA-Interacting 1)
<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">PIN1 Protein</th>
</tr>
<tr>
<td class="label">Compound</td>
<td>Type</td>
</tr>
<tr>
<td class="label">Juglone</td>
<td>Inhibitor</td>
</tr>
<tr>
<td class="label">PiB</td>
<td>Inhibitor</td>
</tr>
<tr>
<td class="label">PIN1-Td</td>
<td>Inhibitor</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/alzheimer's-disease" style="color:#ef9a9a">ALZHEIMER'S DISEASE</a>, <a href="/wiki/aging" style="color:#ef9a9a">Aging</a>, <a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">Alzheimer</a>, <a href="/wiki/alzheimer's-disease" style="color:#ef9a9a">Alzheimer's disease</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">102 edges</a></td>
</tr>
</table>
Introduction
Pin1 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.
...PIN1 Protein (Peptidyl-Prolyl Cis-Trans Isomerase NIMA-Interacting 1)
<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">PIN1 Protein</th>
</tr>
<tr>
<td class="label">Compound</td>
<td>Type</td>
</tr>
<tr>
<td class="label">Juglone</td>
<td>Inhibitor</td>
</tr>
<tr>
<td class="label">PiB</td>
<td>Inhibitor</td>
</tr>
<tr>
<td class="label">PIN1-Td</td>
<td>Inhibitor</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/alzheimer's-disease" style="color:#ef9a9a">ALZHEIMER'S DISEASE</a>, <a href="/wiki/aging" style="color:#ef9a9a">Aging</a>, <a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">Alzheimer</a>, <a href="/wiki/alzheimer's-disease" style="color:#ef9a9a">Alzheimer's disease</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">102 edges</a></td>
</tr>
</table>
Introduction
Pin1 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.
PIN1 is a unique peptidyl-prolyl cis-trans isomerase (PPIase) that catalyzes the isomerization of specific phosphorylated serine/threonine-proline motifs in target proteins. This post-translational modification regulates protein function, localization, stability, and interactions, making PIN1 a critical regulator of signaling pathways involved in neurodegeneration [1]. [@activity]
Overview
PIN1 is a gene/protein encoding a key neuronal protein involved in synaptic function, signal transduction, and cellular homeostasis. Dysfunction of PIN1 is associated with neurodegenerative diseases including Alzheimer's disease, Parkinson's disease, and related disorders. [@proteinprotein]
Structure
PIN1 is a 163-amino acid protein with a distinctive bipartite structure: [@ghosh2017]
- N-terminal WW domain: Recognizes phosphorylated serine/threonine-proline (pSer/Thr-Pro) motifs
- C-terminal PPIase domain: Catalyzes prolyl isomerization
This two-domain architecture allows PIN1 to act as a molecular timer, converting phosphorylation signals into conformational changes in target proteins. [^5]
Normal Function
Prolyl Isomerization
PIN1 catalyzes the cis-trans isomerization of peptide bonds preceding proline residues, particularly those that are phosphorylated. This conformational change can:
- Alter protein-protein interactions
- Change substrate localization
- Modify protein stability
- Activate or inhibit enzymatic activity
Cell Cycle Regulation
PIN1 is essential for cell cycle progression:
- Regulates cyclin-dependent kinase activity
- Controls entry into mitosis
- Modulates DNA damage responses
Transcription Regulation
PIN1 affects gene expression by:
- Modifying transcription factor activity
- Regulating co-activator function
- Controlling [histone modifications](/entities/histone-modifications)
Role in Neurodegenerative Diseases
Alzheimer's Disease
PIN1 dysfunction is closely linked to AD pathogenesis:
- [Tau](/proteins/tau) pathology: Loss of PIN1 function leads to increased tau aggregation and NFT formation
- [Amyloid precursor protein](/entities/app-protein) (APP) processing: PIN1 regulates APP trafficking and [Aβ](/proteins/amyloid-beta) production
- Synaptic dysfunction: Impaired synaptic plasticity and memory formation
- Neuronal cell cycle re-entry: Aberrant cell cycle activation in AD [neurons](/entities/neurons)
Genetic studies show PIN1 promoter polymorphisms increase AD risk [2].
Parkinson's Disease
- [α-Synuclein](/proteins/alpha-synuclein) phosphorylation: PIN1 affects α-synuclein aggregation propensity
- Mitochondrial function: Modulates PINK1/Parkin pathway
- Dopaminergic neuron survival: Regulates neuronal viability
Amyotrophic Lateral SALS
- [TDP-43](/proteins/tdp-43) pathology: Alters [TDP-43](/mechanisms/tdp-43-proteinopathy) phosphorylation and aggregation
- RNA processing: Dysregulation of RNA-binding proteins
Therapeutic Targeting
PIN1 Modulators
Therapeutic Approaches
Background
The study of Pin1 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
- [PubMed](https://pubmed.ncbi.nlm.nih.gov/) - Biomedical literature
- [Alzheimer's Disease Neuroimaging Initiative](https://adni.loni.usc.edu/) - Research data
- [Allen Brain Atlas](https://brain-map.org/) - Brain gene expression data
Key Publications
[@ghosh2017]: Ghosh A, et al. PIN1 maint[^5]: Smet-Nocca C, et al. Identification of novel tau phosphorylation inhibitors. ChemMedChem. 2017;12(10):808-818. PMID: 28494182(https:/
Cross-References
- [Tau Pathology](/mechanisms/tau-pathology) [Alzheimer's Disease](/diseases/alzheimers-disease)
- [Parkinson's Disease](/di- [Alpha-Synuclein](/proteins/alpha-synuclein)isease)
- [Alpha-Synuclein](/proteins/alpha-synuclein) APP
See Also
- Protein Isomerase Inhibitors
- [Tau Pathology Pathway](/mechanisms/tau-pathology)
References
Unknown, Enzyme inhibition: Small molecule inhibitors to reduce excessive PIN1 activity (n.d.)
Unknown, Activity enhancement: For loss-of-function scenarios in AD (n.d.)
Unknown, Protein-protein interaction blockers: Disrupt PIN1-substrate interactions (n.d.)
Ghosh A, et al, PIN1 maint[^5]: Smet-Nocca C, et al (2017)