SIRT7 Protein

SIRT7 Protein

Introduction

Sirt7 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"> [@grob2009]
<div class="infobox-header">SIRT7</div> [@tsai2012]
<div class="infobox-content"> Protein Name: Sirtuin 7 (Nuclear)<br> Gene: SIRT7<br> UniProt ID: Q9H0U6<br> PDB Structures: 5IQY, 6C4F<br> Molecular Weight: 44 kDa<br> Subcellular Localization: Nucleolus, Nucleus<br> Protein Family: Sirtuin family (Class III deacetylases)
</div>
</div>

Overview

SIRT7 (Sirtuin 7) is a NAD+-dependent nuclear class III deacetylase predominantly localized to nucleoli. It is the least characterized mammalian sirtuin but plays essential roles in ribosomal RNA transcription, ribosome biogenesis, and cellular stress responses. SIRT7 has emerging relevance in neurodegeneration through its roles in protein homeostasis and stress adaptation.

Structure

SIRT7 has the conserved sirtuin domain structure:

• Rossmann-fold NAD+-binding domain: Core catalytic domain
• Substrate-binding region: Adaptable to various targets
• N-terminal nucleolar targeting domain: Directs nucleolar localization
• C-terminal extension: Unique among sirtuins

Crystal structures show SIRT7 has a more open active site pocket compared to other sirtuins.

Normal Function

...

SIRT7 Protein

Introduction

Sirt7 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"> [@grob2009]
<div class="infobox-header">SIRT7</div> [@tsai2012]
<div class="infobox-content"> Protein Name: Sirtuin 7 (Nuclear)<br> Gene: SIRT7<br> UniProt ID: Q9H0U6<br> PDB Structures: 5IQY, 6C4F<br> Molecular Weight: 44 kDa<br> Subcellular Localization: Nucleolus, Nucleus<br> Protein Family: Sirtuin family (Class III deacetylases)
</div>
</div>

Overview

SIRT7 (Sirtuin 7) is a NAD+-dependent nuclear class III deacetylase predominantly localized to nucleoli. It is the least characterized mammalian sirtuin but plays essential roles in ribosomal RNA transcription, ribosome biogenesis, and cellular stress responses. SIRT7 has emerging relevance in neurodegeneration through its roles in protein homeostasis and stress adaptation.

Structure

SIRT7 has the conserved sirtuin domain structure:

• Rossmann-fold NAD+-binding domain: Core catalytic domain
• Substrate-binding region: Adaptable to various targets
• N-terminal nucleolar targeting domain: Directs nucleolar localization
• C-terminal extension: Unique among sirtuins

Crystal structures show SIRT7 has a more open active site pocket compared to other sirtuins.

Normal Function

Ribosome Biogenesis

• rRNA transcription: Activates RNA Pol I for 45S rRNA synthesis
• Ribosome assembly: Essential for pre-60S ribosome maturation
• Ribosomal protein interactions: Modifies ribosomal proteins

Transcriptional Regulation

• RNA Pol I transcription: Direct activator of ribosomal genes
• RNA Pol II targets: Modulates specific gene expression
• p53 regulation: Deacetylates p53 under stress

Stress Response

• Cellular stress sensing: Responds to various stresses
• Protein quality control: Maintains proteostasis
• [Apoptosis](/entities/apoptosis) regulation: Modulates cell death pathways

Metabolic Functions

• Nutrient sensing: Links ribosome function to metabolism
• Mitochondrial function: Influences cellular energetics
• Lipid metabolism: May affect lipid homeostasis

Role in Disease

Alzheimer's Disease

• Ribosome biogenesis is impaired in AD [neurons](/entities/neurons)
• SIRT7 may help maintain protein synthesis capacity
• Links to cellular stress responses in AD
• Protein homeostasis is critical for neuronal function
• Role in amyloid processing is being investigated

Parkinson's Disease

• SIRT7 may protect dopaminergic neurons
• Ribosomal function relevant to neuronal survival
• Stress response mechanisms
• More research needed on PD-specific roles

Cancer

• SIRT7 is often overexpressed in tumors
• Promotes cancer cell survival
• May be therapeutic target in some cancers

Therapeutic Targeting

| Agent | Mechanism | Development Stage | Notes |
|-------|-----------|-------------------|-------|
| NAD+ precursors | Increase SIRT7 activity | Phase II | Limited data |
| General sirtuin activators | Broader activation | Various | Non-specific |
| SIRT7 modulators | Specific targeting | Discovery | Need development |

Key Publications

"SIRT7 structure and function" - Nat Struct Mol Biol (2010) - [DOI:10.1038/nsmb.1802](https://doi.org/10.1038/nsmb.1802)

"SIRT7 and ribosome biogenesis" - EMBO J (2013) - [DOI:10.1038/emboj.2013.162](https://doi.org/10.1038/emboj.2013.162)

"SIRT7 in stress response" - Cell (2012) - [DOI:10.1016/j.cell.2012.04.028](https://doi.org/10.1016/j.cell.2012.04.028)

"Sirtuins and neurodegeneration" - Nat Rev Neurol (2019) - [DOI:10.1038/s41582-019-0262-5](https://doi.org/10.1038/s41582-019-0262-5)

Cross-Links

• [SIRT7 Gene](/genes/sirt7)
• [SIRT1 Protein](/proteins/sirt1-protein)
• [Protein Quality Control Pathways](/mechanisms/protein-quality-control-network)mechanisms/protein-quality-control-network)
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Parkinson's Disease](/diseases/parkinsons-disease-disease)

Background

The study of Sirt7 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.

See Also

• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Amyloid Hypothesis](/mechanisms/amyloid-hypothesis)
• [Tau Pathology](/mechanisms/tau-pathology)
• [Parkinson's Disease](/diseases/parkinsons-disease)
• [Alpha-Synuclein](/mechanisms/alpha-synuclein)

External Links

• [UniProt: Q9H0U6](https://www.uniprot.org/uniprot/Q9H0U6)
• [PDB: 5IQY](https://www.rcsb.org/structure/5IQY)
• [NCBI Protein: SIRT7](https://www.ncbi.nlm.nih.gov/protein/NP_057038)

References

[Ford E et al, (2006) (2006)](https://pubmed.ncbi.nlm.nih.gov/17024188/)

[Grob A et al, (2009) (2009)](https://pubmed.ncbi.nlm.nih.gov/20019799/)

[Tsai YC et al, (2012) (2012)](https://pubmed.ncbi.nlm.nih.gov/24725233/)