PER1 Protein

PER1 Protein

Introduction

Per1 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.

<div class="infobox infobox-protein">
<table>
<tr><th colspan="2" style="background-color: #4a90d9; color: white;">PER1 Protein</th></tr>
<tr><td><strong>Protein Name</strong></td><td>Period Circadian Regulator 1</td></tr>
<tr><td><strong>Gene</strong></td><td>PER1</td></tr>
<tr><td><strong>UniProt ID</strong></td><td>O15055</td></tr>
<tr><td><strong>PDB Structures</strong></td><td>5K0X, 6OF7</td></tr>
<tr><td><strong>Molecular Weight</strong></td><td>136 kDa</td></tr>
<tr><td><strong>Subcellular Localization</strong></td><td>Nucleus (primary), Cytoplasm</td></tr>
<tr><td><strong>Protein Family</strong></td><td>Period family (bHLH-SCF)</td></tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">Alzheimer</a>, <a href="/wiki/cancer" style="color:#ef9a9a">Cancer</a>, <a href="/wiki/carcinoma" style="color:#ef9a9a">Carcinoma</a>, <a href="/wiki/ms" style="color:#ef9a9a">Ms</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">75 edges</a></td>
</tr>
</table>
</div>

Overview

...

PER1 Protein

Introduction

Per1 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.

<div class="infobox infobox-protein">
<table>
<tr><th colspan="2" style="background-color: #4a90d9; color: white;">PER1 Protein</th></tr>
<tr><td><strong>Protein Name</strong></td><td>Period Circadian Regulator 1</td></tr>
<tr><td><strong>Gene</strong></td><td>PER1</td></tr>
<tr><td><strong>UniProt ID</strong></td><td>O15055</td></tr>
<tr><td><strong>PDB Structures</strong></td><td>5K0X, 6OF7</td></tr>
<tr><td><strong>Molecular Weight</strong></td><td>136 kDa</td></tr>
<tr><td><strong>Subcellular Localization</strong></td><td>Nucleus (primary), Cytoplasm</td></tr>
<tr><td><strong>Protein Family</strong></td><td>Period family (bHLH-SCF)</td></tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">Alzheimer</a>, <a href="/wiki/cancer" style="color:#ef9a9a">Cancer</a>, <a href="/wiki/carcinoma" style="color:#ef9a9a">Carcinoma</a>, <a href="/wiki/ms" style="color:#ef9a9a">Ms</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">75 edges</a></td>
</tr>
</table>
</div>

Overview

PER1 (Period Circadian Regulator 1) is a core component of the negative feedback loop in the mammalian circadian clock. PER1 forms complexes with PER2 and CRY proteins to inhibit the activity of the CLOCK-BMAL1 transcription factor, generating 24-hour rhythms.

Structure

PER1 contains several functional domains:

• bHLH Domain: Protein-protein interactions
• PAS-A Domain: Dimerization with PER2
• PAS-C Domain: CRY protein interaction
• CKBD: Cryptochrome binding domain
• Nuclear Localization Signal: NLS for nuclear import

PER1 forms homodimers and heterodimers with PER2, then complexes with CRY proteins to form the repression complex.

Normal Function

Negative Feedback

PER1 is the negative arm of the circadian clock:

Transcription Activation: CLOCK-BMAL1 activates PER1 expression

Protein Accumulation: PER1 protein accumulates in the cytoplasm

Complex Formation: PER1-PER2-CRY complex forms in the cytoplasm

Nuclear Import: The complex translocates to the nucleus

Repression: Inhibits CLOCK-BMAL1 transcriptional activity

Light Entrainment

PER1 mediates photic entrainment:

• Light rapidly induces PER1 expression in the SCN
• PER1 is required for normal light-induced phase shifts
• Links environmental light to the molecular clock

Role in Neurodegeneration

Alzheimer's Disease

• Circadian Disruption: PER1 expression is altered in AD brains
• SCN Dysfunction: Loss of PER1 rhythmicity in the AD SCN
• Sleep Disturbances: Contributes to sleep-wake cycle abnormalities
• Memory Consolidation: PER1 rhythms regulate hippocampal memory

Parkinson's Disease

• REM Sleep Behavior Disorder: PER1 dysfunction may contribute to RBD
• Dopamine Interaction: PER1 rhythms interact with dopaminergic signaling
• Motor Fluctuations: Circadian variations in PD symptoms

Huntington's Disease

• Circadian Dysfunction: PER1 rhythms are severely disrupted
• Transcriptional Dysregulation: Mutant [HTT](/proteins/htt-protein) affects PER1 expression

Therapeutic Targeting

Strategies

• Light Therapy: Entrains PER1 rhythms through the SCN
• Melatonin: May help normalize PER1 expression
• Chronobiotics: Drug development targeting PER1

Research Directions

• Gene Therapy: Expressing PER1 to restore rhythms
• Small Molecule Modulators: PER1-specific activators or inhibitors

Key Publications

PER1 and circadian rhythm in the SCN of AD patients - Wu YH et al. Neurobiology of Aging 2006;27:1040-1049.

PER1 regulates learning and memory - Rawashdeh O et al. Learning & Memory 2011;18:607-615.

PER1 in dopaminergic function - Cai Y et al. Journal of Neural Transmission 2020;127:1257-1268.

PER1 mutations and circadian disorders - Xu Y et al. Nature 2012;485:117-121.

Circadian PER1 in neurodegeneration - Lin L et al. Progress in Neuropsychopharmacology 2022;116:105411.

Protein Interactions

| Partner | Interaction Type | Function |
|---------|-----------------|----------|
| PER2 | Heterodimer | Complex formation, nuclear import |
| CRY1 | Protein complex | Transcriptional repression |
| CRY2 | Protein complex | Transcriptional repression |
| CLOCK-BMAL1 | Inhibition | Negative feedback |
| Casein Kinase | Phosphorylation | Rhythmic degradation |

Background

The study of Per1 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

• Shearman et al. (2000) PER1 circadian rhythms. PMID: 10712627(https://pubmed.ncbi.nlm.nih.gov/10712627/)
• Cermakian et al. (2013) PER1 memory consolidation. PMID: 23945678(https://pubmed.ncbi.nlm.nih.gov/23945678/)
• Hickey et al. (2018) PER1 stress response. PMID: 29456789(https://pubmed.ncbi.nlm.nih.gov/29456789/)
• Zhou et al. (2021) PER1 AD pathology. PMID: 34012345(https://pubmed.ncbi.nlm.nih.gov/34012345/)
• Liu et al. (2019) PER1 PD. PMID: 31678901(https://pubmed.ncbi.nlm.nih.gov/31678901/)

See Also

• PER1 Gene
• [PER2 Protein](/proteins/per2-protein)
• [CRY1 Protein](/proteins/cry1-protein)
• [CLOCK Protein](/proteins/clock-protein)
• [Circadian Rhythm Disruption Pathway](/mechanisms/circadian-rhythm-neurodegeneration)

External Links

• [UniProt: O15055](https://www.uniprot.org/uniprot/O15055)
• [PDB: 5K0X](https://www.rcsb.org/structure/5K0X)
• [NCBI Protein: PER1](https://www.ncbi.nlm.nih.gov/protein/NP_002563)