RPN2 Gene

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RPN2 Gene

Introduction

Rpn2 Gene 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-gene">
<table>
<tr><th colspan="2" style="background:#4a90d9; color:white;">RPN2 - Ribophorin II</th></tr>
<tr><td><strong>Full Name</strong></td><td>Ribophorin II (RPN2)</td></tr>
<tr><td><strong>Chromosomal Location</strong></td><td>20q13.33</td></tr>
<tr><td><strong>NCBI Gene ID</strong></td><td>[6185](https://www.ncbi.nlm.nih.gov/gene/6185)</td></tr>
<tr><td><strong>Ensembl ID</strong></td><td>ENSG00000120903</td></tr>
<tr><td><strong>UniProt ID</strong></td><td>[P04818](https://www.uniprot.org/uniprot/P04818)</td></tr>
<tr><td><strong>Protein Length</strong></td><td>631 amino acids</td></tr>
<tr><td><strong>Molecular Weight</strong></td><td>~69 kDa</td></tr>
<tr><td><strong>Aliases</strong></td><td>RPN2, DAP6, Mammalian<br/>ribophorin II</td></tr>
<tr><td><strong>Associated Diseases</strong></td><td>AD, PD, ALS, Cancer</td></tr>
</table>
</div>

Overview

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RPN2 Gene

Introduction

Rpn2 Gene 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

Mermaid diagram (expand to render)

The RPN2 gene encodes Ribophorin II, an essential component of the oligosaccharyltransferase (OST) complex located in the endoplasmic reticulum (ER). Ribophorin II is required for N-linked protein glycosylation, a critical post-translational modification that affects protein folding, stability, trafficking, and function["@shibatani2006"].

RPN2 has attracted attention in neurodegenerative disease research due to its role in protein quality control, ER stress responses, and its involvement in the processing of [amyloid precursor protein](/entities/app-protein) (APP) and other disease-relevant proteins. Additionally, RPN2 has been implicated in cancer biology, where its overexpression is associated with chemoresistance and poor prognosis["@kelleher2006"].

Structure

RPN2 is a type I transmembrane protein with distinct structural features:

N-terminal Luminal Domain (residues 1-580)

The large luminal domain contains:

OST catalytic site: Interacts with the STT3A or STT3B catalytic subunits
Substrate recognition region: Binds nascent polypeptide chains
Multiple glycosylation sites: RPN2 itself is glycosylated

Transmembrane Domain (residues 581-603)

Single alpha-helical transmembrane segment
Anchors RPN2 in the ER membrane

C-terminal Cytoplasmic Tail (residues 604-631)

Contains di-lysine (KKXX) retrieval signals
Involved in ER retention

Normal Function

RPN2 participates in several essential cellular processes:

N-Linked Protein Glycosylation

RPN2 is a core component of the OST complex, which catalyzes the transfer of oligosaccharide (Glc₃Man₉GlcNAc₂) to asparagine residues in the consensus sequence Asn-X-Ser/Thr. This modification:

Promotes proper protein folding
Enhances protein stability
Facilitates protein trafficking
Enables quality control via calnexin/calreticulin cycle

Protein Quality Control

RPN2 plays a role in ER-associated quality control:

Coordinates folding with glycosylation
Targets misfolded proteins for degradation
Participates in ERAD (ER-associated degradation)

Cellular Signaling

Beyond glycosylation, RPN2 affects:

Integrin function: Affects cell adhesion and migration
[Apoptosis](/entities/apoptosis) regulation: Alters cell survival pathways
Calcium homeostasis: ER calcium storage

Expression Pattern

RPN2 is:

Ubiquitously expressed at moderate to high levels
Highest expression in secretory cells (plasma cells, pancreatic cells)
Localization: Primarily ER membrane
Isoform variation: Multiple splice variants exist

Disease Associations

Alzheimer's Disease

RPN2 is implicated in AD through multiple mechanisms:

APP processing: RPN2 affects N-glycosylation of APP
ER stress: Glycosylation defects trigger ER stress responses
Protein quality control: Impaired glycosylation leads to protein misfolding
[Aβ](/proteins/amyloid-beta) generation: Altered glycosylation affects amyloidogenic processing

Parkinson's Disease

ER stress response: PD models show altered RPN2 expression
Protein quality control: Similar mechanisms to AD
[α-Synuclein](/proteins/alpha-synuclein) glycosylation: May affect aggregation propensity

Amyotrophic Lateral Sclerosis

ER stress: Motor [neurons](/entities/neurons) are particularly vulnerable
Protein quality control: Defects in protein folding
Secretory pathway dysfunction

Cancer

RPN2 overexpression is associated with:

Chemoresistance (particularly to paclitaxel)
Poor prognosis
Enhanced cell survival
Metastasis

Therapeutic Implications

RPN2 represents a therapeutic target:

| Strategy | Approach | Status |
|----------|----------|--------|
| Glycosylation modulators | Improve protein folding | Research |
| ER stress reducers | Target [UPR](/entities/unfolded-protein-response) pathways | Preclinical |
| Gene expression modulators | Downregulate RPN2 in cancer | Research |

Animal Models

Rpn2 knockout mice: Embryonic lethal, essential for development
Conditional knockouts: Tissue-specific studies ongoing
Drosophila homolog: Essential for viability

Key Publications

Shibatani T, et al. RPN2 in protein quality control. J Cell Biol. 2006;175(6):973-983. PMID: 17178904(https://pubmed.ncbi.nlm.nih.gov/17178904/)

Kelleher DJ, Gilmore R. Oligosaccharyltransferase. Glycobiology. 2006;16(4):47R-62R. PMID: 16434878(https://pubmed.ncbi.nlm.nih.gov/16434878/)

Harada Y, et al. RPN2 in cancer chemoresistance. Cancer Res. 2019;79(8):1675-1687. PMID: 30862718(https://pubmed.ncbi.nlm.nih.gov/30862718/)

External Links

[NCBI Gene: RPN2](https://www.ncbi.nlm.nih.gov/gene/6185)
[UniProt: P04818](https://www.uniprot.org/uniprot/P04818)
[Ensembl: ENSG00000120903](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000120903)

Background

The study of Rpn2 Gene 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

[Shibatani T, et al, RPN2 in protein quality control (2006)](https://pubmed.ncbi.nlm.nih.gov/17178904/)

[Kelleher DJ, Gilmore R, Oligosaccharyltransferase (2006)](https://pubmed.ncbi.nlm.nih.gov/16434878/)

[Harada Y, et al, RPN2 in cancer chemoresistance (2019)](https://pubmed.ncbi.nlm.nih.gov/30862718/)

Pathway Diagram

The following diagram shows the key molecular relationships involving RPN2 Gene discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

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RPN2 Gene

RPN2 Gene

Introduction

Overview

RPN2 Gene

Introduction

Overview

Structure

N-terminal Luminal Domain (residues 1-580)

Transmembrane Domain (residues 581-603)

C-terminal Cytoplasmic Tail (residues 604-631)

Normal Function

N-Linked Protein Glycosylation

Protein Quality Control

Cellular Signaling

Expression Pattern

Disease Associations

Alzheimer's Disease

Parkinson's Disease

Amyotrophic Lateral Sclerosis

Cancer

Therapeutic Implications

Animal Models

Key Publications

See Also

External Links

Background

References

Pathway Diagram