NPRL3 Protein
Introduction
<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">NPRL3 Protein</th>
</tr>
<tr>
<td class="label">Protein Name</td>
<td>NPRL3 (Nitrogen Permease Regulator-Like 3)</td>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>NPRL3</td>
</tr>
<tr>
<td class="label">Aliases</td>
<td>NPRL3, HDR3, GATOR2 Complex Subunit</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>Q86X55</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>462 aa (~52 kDa</td>
</tr>
<tr>
<td class="label">Subcellular Localization</td>
<td>Cytosol, lysosomal membrane</td>
</tr>
<tr>
<td class="label">Protein Family</td>
<td>NPRL2/NPRL3 family</td>
</tr>
<tr>
<td class="label">Strategy</td>
<td>Description</td>
</tr>
<tr>
<td class="label">mTOR Inhibitors</td>
<td>Rapamycin, everolimus to reduce mTORC1 hyperactivity</td>
</tr>
<tr>
<td class="label">Autophagy Inducers</td>
<td>Rapamycin, metformin to enhance protein clearance</td>
</tr>
<tr>
<td class="label">GATOR2 Modulators</td>
<td>Novel compounds targeting GATOR2 complex</td>
</tr>
<tr>
<td class="label">Chromosome</td>
<td>16</td>
</tr>
<tr>
<td class="label">Location</td>
<td>16p13.3</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>285508</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000176769</td>
</tr>
<tr>
<td cl
...NPRL3 Protein
Introduction
<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">NPRL3 Protein</th>
</tr>
<tr>
<td class="label">Protein Name</td>
<td>NPRL3 (Nitrogen Permease Regulator-Like 3)</td>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>NPRL3</td>
</tr>
<tr>
<td class="label">Aliases</td>
<td>NPRL3, HDR3, GATOR2 Complex Subunit</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>Q86X55</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>462 aa (~52 kDa</td>
</tr>
<tr>
<td class="label">Subcellular Localization</td>
<td>Cytosol, lysosomal membrane</td>
</tr>
<tr>
<td class="label">Protein Family</td>
<td>NPRL2/NPRL3 family</td>
</tr>
<tr>
<td class="label">Strategy</td>
<td>Description</td>
</tr>
<tr>
<td class="label">mTOR Inhibitors</td>
<td>Rapamycin, everolimus to reduce mTORC1 hyperactivity</td>
</tr>
<tr>
<td class="label">Autophagy Inducers</td>
<td>Rapamycin, metformin to enhance protein clearance</td>
</tr>
<tr>
<td class="label">GATOR2 Modulators</td>
<td>Novel compounds targeting GATOR2 complex</td>
</tr>
<tr>
<td class="label">Chromosome</td>
<td>16</td>
</tr>
<tr>
<td class="label">Location</td>
<td>16p13.3</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>285508</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000176769</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">ALS</a>, <a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/cancer" style="color:#ef9a9a">Cancer</a>, <a href="/wiki/tumor" style="color:#ef9a9a">Tumor</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">18 edges</a></td>
</tr>
</table>
Nprl3 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.
Overview
Molecular Function
NPRL3 is a core component of the GATOR2 complex, a critical regulator of the mTORC1 signaling pathway:
GATOR2 Complex Function
NPRL3 forms a stoichiometric complex with NPRL2, WDR24, CASTOR1/2, and MIOS. This complex senses intracellular amino acid levels, particularly leucine and arginine, and regulates mTORC1 activation.
Amino Acid Sensing
The GATOR2 complex acts upstream of GATOR1 (which contains DEPDC5, NPRL2, and NPRL1). When amino acids are abundant, GATOR2 inhibits GATOR1, allowing Rag GTPases to activate mTORC1. When amino acids are scarce, GATOR1 is activated, inhibiting mTORC1.
mTORC1 Regulation
mTORC1 (mechanistic Target Of Rapamycin Complex 1) is a central regulator of:
- Protein synthesis (via S6K1 and 4E-BP1)
- [Autophagy](/entities/autophagy) inhibition
- Cell growth and proliferation
- Metabolic processes
Role in Neurodegeneration
Alzheimer's Disease
- [mTOR](/entities/mtor) Hyperactivity: AD brains show elevated mTORC1 activity, leading to impaired autophagy and accumulation of [Aβ](/proteins/amyloid-beta) and [tau](/proteins/tau) aggregates
- Autophagy Impairment: NPRL3/GATOR2 dysregulation contributes to defective autophagic-lysosomal clearance of pathological proteins
- Synaptic Dysfunction: [mTOR](/mechanisms/mtor-signaling-pathway) overactivation impairs synaptic plasticity and memory formation
Parkinson's Disease
- [α-Synuclein](/proteins/alpha-synuclein) Clearance: Impaired mTORC1 regulation affects autophagy-mediated clearance of α-synuclein
- Lysosomal Function: GATOR2 regulates lysosomal biogenesis and function, compromised in PD
- Metabolic Dysregulation: mTORC1 controls neuronal metabolism and energy homeostasis
Tuberous Sclerosis Complex (TSC)
NPRL3 interacts with TSC1/TSC2 complex, another key regulator of mTORC1. Mutations in TSC genes cause tuberous sclerosis, characterized by benign tumors and neurological complications including epilepsy and intellectual disability.
Epilepsy
Dysregulated mTORC1 signaling contributes to epileptogenesis. NPRL3 mutations have been associated with familial epilepsy, highlighting its importance in neuronal excitability.
Signaling Pathway
Mermaid diagram (expand to render)
Therapeutic Implications
Key Publications
Bar-Peled L et al. "A tumor suppressor complex with GAP activity for the Rag GTPases that signals amino acid sufficiency to mTORC1." Cell. 2013;154(3):555-566. PMID: 23910808(https://pubmed.ncbi.nlm.nih.gov/23910808/)
Wolfson RL et al. "Sestrin2 is a leucine sensor for the mTORC1 pathway." Science. 2016;351(6268):43-48. PMID: 26449471(https://pubmed.ncbi.nlm.nih.gov/26449471/)
Chantranupong L et al. "The GATOR proteins regulate nitrogen permease-like proteins." Mol Cell. 2014;56(2):168-178. PMID: 25454944(https://pubmed.ncbi.nlm.nih.gov/25454944/)
Kim J et al. "mTORC1 regulates cell growth and autophagy in neurodegeneration." Nat Rev Neurosci. 2021;22(5):281-297. PMID: 33772229(https://pubmed.ncbi.nlm.nih.gov/33772229/)
Jao DL et al. "NPRL3 mutations cause epilepsy and dysregulated mTORC1 signaling." Ann Neurol. 2019;86(3):337-350. PMID: 31429932(https://pubmed.ncbi.nlm.nih.gov/31429932/)Background
The study of Nprl3 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)
References
Cross-References
- [NPRL3 Gene](/genes/nprl3)
- [NPRL2 Gene](/genes/nprl2)
- [DEPDC5 Gene](/genes/depdc5)
- [mTOR Signaling Pathway](/mechanisms/mtor-signaling-pathway)
- [Autophagy-Lysosomal Pathway](/mechanisms/autophagy-lysosomal-pathway)
- [Metabolic Dysfunction Pathway](/mechanisms/metabolic-dysfunction-pathway)
- [Alzheimer's Disease](/diseases/alzheimers-disease)
- [Parkinson's Disease](/diseases/parkinsons-disease-disease)
- [Tuberous Sclerosis](/diseases/tuberous-sclerosis)
External Links
- [UniProt - NPRL3](https://www.uniprot.org/uniprot/Q86X55)
- [NCBI Gene - NPRL3](https://www.ncbi.nlm.nih.gov/gene/285508)
- [AlphaFold - NPRL3](https://alphafold.ebi.ac.uk/entry/Q86X55)
- [PDB - NPRL3](https://www.ebi.ac.uk/pdbe/)