RPTOR — Regulatory Associated Protein of MTOR Complex 1

Migration, Crosslink

📖

RPTOR — Regulatory Associated Protein of MTOR Complex 1

active

wiki page Created: 2026-04-02T07:19:25 By: crosslink-migration Quality: 50% ✓ SciDEX ID: wiki-genes-rptor

📖 Wiki Page

gene1315 wordssynced 2026-04-02

RPTOR — Regulatory Associated Protein of MTOR Complex 1

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">RPTOR — Regulatory Associated Protein of MTOR Complex 1</th>
</tr>
<tr> [@gwinn2008]
<td class="label">Symbol</td> [@tramutola2018]
<td><strong>RPTOR</strong></td> [@malagelada2010]
</tr> [@saxton2017]
<tr> [@tang2019]
<td class="label">Full Name</td> [@bov2011]
<td>Regulatory Associated Protein of MTOR Complex 1 (Raptor)</td>
</tr>
<tr>
<td class="label">Chromosome</td>
<td>17q25.3</td>
</tr>
<tr>
<td class="label">NCBI Gene</td>
<td><a href="https://www.ncbi.nlm.nih.gov/gene/57521" target="_blank">57521</a></td>
</tr>
<tr>
<td class="label">Ensembl</td>
<td><a href="https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000141564" target="_blank">ENSG00000141564</a></td>
</tr>
<tr>
<td class="label">OMIM</td>
<td><a href="https://omim.org/entry/607592" target="_blank">607592</a></td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/Q8N122" target="_blank">Q8N122</a></td>
</tr>
<tr>
<td class="label">Protein</td>
<td>[Raptor Protein](/proteins/rptor-protein)</td>
</tr>
<tr>
<td class="label">Diseases</td>
<td>[Alzheimer's Disease](/diseases/alzheimers), [Parkinson's Disease](/diseases/parkinsons-disease), [Huntington's Disease](/diseases/huntingtons), [ALS](/diseases/als), Tuberous Sclerosis</td>
</tr>
<tr>
<td class="label">Expression</td>
<td>[Hippocampus](/brain-regions/hip

...

RPTOR — Regulatory Associated Protein of MTOR Complex 1

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">RPTOR — Regulatory Associated Protein of MTOR Complex 1</th>
</tr>
<tr> [@gwinn2008]
<td class="label">Symbol</td> [@tramutola2018]
<td><strong>RPTOR</strong></td> [@malagelada2010]
</tr> [@saxton2017]
<tr> [@tang2019]
<td class="label">Full Name</td> [@bov2011]
<td>Regulatory Associated Protein of MTOR Complex 1 (Raptor)</td>
</tr>
<tr>
<td class="label">Chromosome</td>
<td>17q25.3</td>
</tr>
<tr>
<td class="label">NCBI Gene</td>
<td><a href="https://www.ncbi.nlm.nih.gov/gene/57521" target="_blank">57521</a></td>
</tr>
<tr>
<td class="label">Ensembl</td>
<td><a href="https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000141564" target="_blank">ENSG00000141564</a></td>
</tr>
<tr>
<td class="label">OMIM</td>
<td><a href="https://omim.org/entry/607592" target="_blank">607592</a></td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/Q8N122" target="_blank">Q8N122</a></td>
</tr>
<tr>
<td class="label">Protein</td>
<td>[Raptor Protein](/proteins/rptor-protein)</td>
</tr>
<tr>
<td class="label">Diseases</td>
<td>[Alzheimer's Disease](/diseases/alzheimers), [Parkinson's Disease](/diseases/parkinsons-disease), [Huntington's Disease](/diseases/huntingtons), [ALS](/diseases/als), Tuberous Sclerosis</td>
</tr>
<tr>
<td class="label">Expression</td>
<td>[Hippocampus](/brain-regions/hippocampus), [Cortex](/brain-regions/cortex), Cerebellum, Substantia nigra (ubiquitous)</td>
</tr>
<tr>
<th class="infobox-subheader" colspan="2">Key Pathways</th>
</tr>
<tr>
<td colspan="2" style="font-size:0.85em">mTORC1 signaling, [autophagy](/entities/autophagy) regulation, protein synthesis, lysosomal biogenesis, AMPK crosstalk</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/fibrosis" style="color:#ef9a9a">Fibrosis</a>, <a href="/wiki/hepatitis" style="color:#ef9a9a">Hepatitis</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">276 edges</a></td>
</tr>
</table>

RPTOR — Regulatory Associated Protein of MTOR Complex 1

Overview

RPTOR (Regulatory Associated Protein of [MTOR](/mechanisms/mtor-signaling-pathway) Complex 1), also known as Raptor, is an essential scaffolding component of the [mTOR](/genes/mtor) Complex 1 (mTORC1), located on chromosome 17q25.3. Raptor functions as a substrate-recognition subunit that recruits downstream targets to mTORC1 for phosphorylation, thereby controlling protein synthesis, autophagy, lysosomal biogenesis, and cellular metabolism. As the defining component that distinguishes mTORC1 from mTORC2 (which uses [RICTOR](/genes/rictor)), Raptor is a critical determinant of mTORC1 substrate specificity.

mTORC1 hyperactivation through Raptor-dependent signaling is one of the most consistently observed pathological features across neurodegenerative diseases including [Alzheimer's disease](/diseases/alzheimers-disease), [Parkinson's disease](/diseases/parkinsons-disease), and [Huntington's disease](/diseases/huntingtons). Aberrant mTORC1 activation suppresses autophagy, leading to accumulation of misfolded proteins and damaged organelles — hallmarks of virtually all neurodegenerative conditions.

Gene Structure

The RPTOR gene spans approximately 260 kb on chromosome 17q25.3 and contains 30 exons. It encodes a 1,335-amino acid protein (Raptor) that is highly conserved across eukaryotes. The gene produces several splice variants, though the full-length isoform is predominant in neural tissue.

Regulatory Elements

[TFEB](/genes/tfeb) binding sites: Lysosomal stress induces RPTOR transcription through a [TFEB](/entities/tfeb)-dependent feedback loop
[FOXO](/genes/foxo3) response elements: Nutrient deprivation increases RPTOR expression via FOXO transcription factors
[AMPK](/genes/prkaa1) regulation: AMPK directly phosphorylates Raptor at S722/S792 to inhibit mTORC1 during energy stress
Insulin/[IGF1](/genes/igf1) signaling: Growth factor receptor activation promotes Raptor-mTOR assembly through PI3K-AKT-TSC pathway

Function

mTORC1 Complex Assembly

Raptor is indispensable for mTORC1 function, serving as the scaffold that assembles the complex and recruits substrates:

Mermaid diagram (expand to render)

Key Functions in the Nervous System

Protein synthesis control: Raptor-dependent mTORC1 activation phosphorylates [S6K1](/genes/rps6kb1) and [4E-BP1](/genes/eif4ebp1), driving cap-dependent translation of synaptic proteins, growth factors, and metabolic enzymes critical for neuronal function and synaptic plasticity.

Autophagy regulation: mTORC1-Raptor phosphorylates and inhibits [ULK1](/genes/ulk1)/ULK2 autophagy-initiating kinase and [TFEB](/genes/tfeb) transcription factor. When mTORC1 is active, autophagy is suppressed; when nutrients are scarce or rapamycin inhibits the complex, autophagy is induced. This is the primary mechanism by which mTOR controls protein aggregate clearance in [neurons](/entities/neurons).

Lysosomal biogenesis: Raptor-mTORC1 phosphorylates TFEB at S211, causing cytoplasmic retention by 14-3-3 proteins. Inhibiting mTORC1 allows TFEB nuclear translocation and activation of lysosomal and autophagy gene networks — a promising therapeutic strategy for neurodegeneration.

Synaptic plasticity: mTORC1-dependent local translation at synapses is required for [long-term potentiation](/mechanisms/long-term-potentiation) (LTP) and long-term depression (LTD). Raptor knockdown in hippocampal neurons impairs both LTP maintenance and memory consolidation.

Mitochondrial metabolism: Raptor-mTORC1 regulates [PGC-1α](/genes/ppargc1a) and mitochondrial biogenesis programs, influencing neuronal energy metabolism and oxidative stress resilience.

Axonal growth and regeneration: mTORC1-Raptor signaling through S6K drives axonal protein synthesis required for growth cone dynamics and regeneration after injury.

Disease Associations

Alzheimer's Disease

mTORC1 hyperactivation through Raptor is a consistent finding in [AD](/diseases/alzheimers-disease):

Autophagy impairment: Elevated mTORC1 activity in AD hippocampus suppresses autophagy, allowing accumulation of [amyloid-β](/proteins/amyloid-beta) and hyperphosphorylated [tau](/proteins/tau). Raptor phosphorylation status shows that mTORC1 is constitutively active in AD neurons.
[Tau](/proteins/tau) phosphorylation: mTORC1-S6K directly phosphorylates tau at multiple sites. Raptor-dependent S6K activation contributes to neurofibrillary tangle formation independently of [GSK3β](/genes/gsk3b) and [CDK5](/genes/cdk5).
Aβ production: mTORC1 activation increases [BACE1](/genes/bace1) translation and amyloidogenic [APP](/genes/app) processing. Rapamycin treatment reduces Aβ levels in transgenic AD mouse models.
Insulin resistance: Brain insulin resistance in AD disrupts the insulin-PI3K-AKT-mTORC1 axis, paradoxically leading to mTORC1 hyperactivation through loss of feedback inhibition.
Rapamycin as therapeutic: Rapamycin and rapalogs (which dissociate Raptor from mTOR) show neuroprotective effects in multiple AD models by restoring autophagy and reducing Aβ and tau pathology.

Parkinson's Disease

α-Synuclein clearance: mTORC1 hyperactivation through Raptor impairs autophagic clearance of [α-synuclein](/proteins/alpha-synuclein) aggregates. Rapamycin treatment enhances α-synuclein degradation through autophagy induction.
Dopaminergic neuron vulnerability: Substantia nigra dopaminergic neurons show elevated mTORC1-Raptor activity in PD, which suppresses mitophagy through ULK1 inhibition, exacerbating mitochondrial dysfunction.
[LRRK2](/genes/lrrk2) interaction: LRRK2 G2019S mutation activates mTORC1-Raptor signaling, contributing to impaired autophagy in familial PD.
[PINK1](/genes/pink1)/[Parkin](/genes/prkn) connection: Loss of PINK1 or Parkin leads to compensatory mTORC1 activation, further suppressing the mitophagy that is already compromised.

Huntington's Disease

Polyglutamine aggregates: mTORC1 inhibition with rapamycin enhances clearance of mutant [huntingtin](/proteins/huntingtin) aggregates, one of the first demonstrations that mTOR-autophagy modulation could be therapeutic for neurodegeneration.
Striatal vulnerability: Medium spiny neurons in the striatum show high basal mTORC1-Raptor activity, potentially explaining their selective vulnerability when autophagy is further impaired by mutant [HTT](/proteins/huntingtin).

ALS/FTD

[TDP-43](/genes/tardbp) and [FUS](/entities/fus) aggregates: mTORC1 hyperactivation accelerates [TDP-43](/mechanisms/tdp-43-proteinopathy) and FUS aggregate accumulation. Rapamycin treatment promotes their autophagic clearance.
[C9orf72](/genes/c9orf72) repeat expansion: [C9orf72](/entities/c9orf72) loss-of-function disrupts mTORC1-Raptor regulation, contributing to autophagy-lysosome dysfunction in ALS/FTD.

Expression Pattern

Raptor is ubiquitously expressed with particularly high levels in metabolically active tissues:

Hippocampus: Strong expression in CA1, CA3, and dentate gyrus, consistent with roles in synaptic plasticity and memory
Cortex: Expressed across all layers with enrichment in deep-layer pyramidal neurons
Cerebellum: High expression in Purkinje cells
Substantia nigra: Expressed in dopaminergic neurons
Developing brain: Highest expression during periods of rapid neuronal growth and synaptogenesis
Glial cells: Moderate expression in [astrocytes](/cell-types/astrocytes) and [oligodendrocytes](/cell-types/oligodendrocytes); lower in resting [microglia](/cell-types/microglia)

Therapeutic Implications

mTORC1 Inhibition Strategies

Rapamycin and rapalogs: Rapamycin (sirolimus) and its analogs (everolimus, temsirolimus) allosterically inhibit mTORC1 by disrupting Raptor-mTOR interaction through FKBP12. Clinical trials are underway for AD and other neurodegenerative diseases.

ATP-competitive mTOR inhibitors: Torin1, Torin2, and INK128 inhibit both mTORC1 and mTORC2 but provide more complete mTORC1 inhibition than rapalogs.

AMPK activators: Metformin, AICAR, and other [AMPK](/genes/prkaa1) activators phosphorylate Raptor at S722/S792, inhibiting mTORC1 and inducing autophagy. Metformin is being investigated for AD prevention.

Caloric restriction: Dietary restriction inhibits mTORC1-Raptor signaling and enhances autophagy, showing neuroprotective effects across multiple disease models.

Selective mTORC1 Inhibition

A key therapeutic challenge is selectively inhibiting mTORC1 (through Raptor) while preserving mTORC2 (through [RICTOR](/genes/rictor)) signaling, as mTORC2 promotes neuronal survival through [AKT](/genes/akt1) phosphorylation. Raptor-specific degraders and selective mTORC1 allosteric modulators are under development.

External Links

[NCBI Gene: rptor](https://www.ncbi.nlm.nih.gov/gene/)
[PubMed: rptor](https://pubmed.ncbi.nlm.nih.gov/?term=rptor+neurodegeneration)

References

[Hara et al., Raptor, a binding partner of target of rapamycin (2002) (2002)](https://doi.org/10.1016/S0092-8674(02)

[Kim et al., mTOR complex 1 regulation by Raptor-mediated substrate recognition (2002) (2002)](https://doi.org/10.1016/S1097-2765(02)

[Caccamo et al., mTOR in Alzheimer disease and its modulation by rapamycin (2010) (2010)](https://doi.org/10.1523/JNEUROSCI.0867-10.2010)

[Ravikumar et al., Inhibition of mTOR induces autophagy and clearance of huntingtin aggregates (2004) (2004)](https://doi.org/10.1038/ng1255)

[Gwinn et al., AMPK phosphorylation of Raptor mediates a metabolic checkpoint (2008) (2008)](https://doi.org/10.1016/j.molcel.2008.03.003)

[Tramutola et al., mTOR in Alzheimer disease and brain aging (2018) (2018)](https://doi.org/10.3389/fnagi.2018.00263)

[Malagelada et al., Rapamycin protects dopaminergic neurons in a PD model (2010) (2010)](https://doi.org/10.1523/JNEUROSCI.3531-09.2010)

[Unknown, Saxton & Sabatini, mTOR signaling in growth, metabolism, and disease (2017) (2017)](https://doi.org/10.1016/j.cell.2017.02.004)

[Tang et al., mTORC1-TFEB axis controls lysosomal biogenesis and neuronal survival (2019) (2019)](https://doi.org/10.1016/j.celrep.2019.06.005)

[Bové et al., Fighting neurodegeneration with rapamycin (2011) (2011)](https://doi.org/10.1016/j.tins.2011.09.002)

Pathway Diagram

The following diagram shows the key molecular relationships involving RPTOR — Regulatory Associated Protein of MTOR Complex 1 discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

📖 View canonical wiki page →

Related Entities

RPTOR

▸Metadataorigin_type: v1_polymorphic_backfill

slug	genes-rptor
kg_node_id	RPTOR
entity_type	gene
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-e5f601cba6eb
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'genes-rptor'}
_schema_version	1

📊 Evidence Profile Foundational

Evidence Balance

+0%

Certainty

85%

Debates

0

Incoming

17

Outgoing

43

0 supporting 0 contradicting 0 neutral

View full evidence profile →

Public annotations (0)Annotate on Hypothes.is →

No public annotations yet.

📗 Cite This Artifact

RPTOR — Regulatory Associated Protein of MTOR Complex 1

RPTOR — Regulatory Associated Protein of MTOR Complex 1

RPTOR — Regulatory Associated Protein of MTOR Complex 1

RPTOR — Regulatory Associated Protein of MTOR Complex 1

Overview

Gene Structure

Regulatory Elements

Function

mTORC1 Complex Assembly

Key Functions in the Nervous System

Disease Associations

Alzheimer's Disease

Parkinson's Disease

Huntington's Disease

ALS/FTD

Expression Pattern

Therapeutic Implications

mTORC1 Inhibition Strategies

Selective mTORC1 Inhibition

See Also

External Links

References

Pathway Diagram

💬 Discussion