TGFBR2 Protein — Transforming Growth Factor Beta Receptor 2

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TGFBR2 Protein — Transforming Growth Factor Beta Receptor 2

Introduction

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">TGFBR2 Protein — Transforming Growth Factor Beta Receptor 2</th>
</tr>
<tr>
<td class="label">Protein Name</td>
<td>TGFBR2 (TGF-β Receptor 2)</td>
</tr>
<tr>
<td class="label">Gene</td>
<td>[TGFBR2](/genes/tgfbr2)</td>
</tr>
<tr>
<td class="label">UniProt</td>
<td>[P37173](https://www.uniprot.org/uniprot/P37173)</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>~70 kDa (567 amino acids)</td>
</tr>
<tr>
<td class="label">Subcellular Localization</td>
<td>Plasma membrane, early endosomes</td>
</tr>
<tr>
<td class="label">Protein Family</td>
<td>TGF-β receptor family</td>
</tr>
<tr>
<td class="label">Aliases</td>
<td>TβR-II, TBR2, TGF-β type II receptor</td>
</tr>
<tr>
<td class="label">Expression</td>
<td>Ubiquitous; brain, lung, heart, kidney</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/cancer" style="color:#ef9a9a">Cancer</a>, <a href="/wiki/carcinoma" style="color:#ef9a9a">Carcinoma</a>, <a href="/wiki/cardiovascular" style="color:#ef9a9a">Cardiovascular</a>, <a href="/wiki/colorectal-cancer" style="color:#ef9a9a">Colorectal Cancer</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">65 edges</a></td>
</tr>
</table>

...

TGFBR2 Protein — Transforming Growth Factor Beta Receptor 2

Introduction

TGFBR2 (Transforming Growth Factor Beta Receptor 2) is a transmembrane serine/threonine kinase receptor that serves as the primary receptor for TGF-β ligands in the nervous system. As a type II receptor, TGFBR2 binds TGF-β1, TGF-β2, and TGF-β3 with high affinity, then recruits and phosphorylates the type I receptor (TGFBR1/ALK5) to initiate intracellular signaling. In the brain, TGFBR2 is expressed by neurons, astrocytes, microglia, and endothelial cells, where it regulates diverse processes including neuronal survival, synaptic plasticity, neuroinflammation, and blood-brain barrier function. Dysregulation of TGFBR2 signaling has been implicated in [Alzheimer's Disease](/diseases/alzheimers-disease), [Parkinson's Disease](/diseases/parkinsons-disease), [Amyotrophic Lateral Sclerosis (ALS](/diseases/amyotrophic-lateral-sclerosis)), [multiple sclerosis](/diseases/multiple-sclerosis), and [stroke](/diseases/stroke).

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Overview

TGFBR2 is a constitutively active serine/threonine kinase receptor that transduces TGF-β signaling in the nervous system. Unlike many receptor tyrosine kinases that require ligand-induced activation, TGFBR2 has intrinsic kinase activity that is modulated by ligand binding rather than strictly dependent on it.

The primary functions of TGFBR2 include:

TGF-β Binding: TGFBR2 binds all TGF-β isoforms with high affinity

Type I Receptor Recruitment: After ligand binding, TGFBR2 recruits and phosphorylates TGFBR1

SMAD Signaling: Activated TGFBR1 phosphorylates SMAD2/3, which then translocate to the nucleus

Non-SMAD Signaling: TGFBR2 also activates MAPK, PI3K/AKT, and other pathways

Cell-Type Specific Effects: Different cell types respond differently to TGF-β signaling

In neurons, TGFBR2-mediated signaling regulates:

Neuronal Survival: TGF-β is a potent neurotrophic factor
Synaptic Plasticity: TGF-β modulates long-term potentiation and depression
Neuroprotection: TGF-β protects against various toxins
Differentiation: TGF-β influences neural progenitor differentiation

In glia, TGFBR2 regulates:

Astrocyte Function: TGF-β modulates astrocyte reactivity
Microglial Activation: TGF-β has anti-inflammatory effects
Oligodendrocyte Biology: TGF-β affects myelination

Structure

TGFBR2 is a 567-amino acid transmembrane receptor with a molecular weight of approximately 70 kDa. Key structural features include:

Extracellular Domain (1-182): Contains cysteine-rich repeats that form the ligand-binding pocket
Transmembrane Domain (183-203): Single pass transmembrane helix
Kinase Domain (204-464): Serine/threonine kinase domain with constitutive activity
C-terminal Tail (465-567): Contains regulatory sequences and endocytosis motifs

The structure of TGFBR2's extracellular domain reveals a tight ligand-binding pocket that accommodates all TGF-β isoforms with similar affinity. The kinase domain is constitutively active, but ligand binding dramatically increases substrate (TGFBR1) recruitment efficiency.

Normal Function

TGF-β Signaling Cascade

TGFBR2 initiates TGF-β signaling through a well-characterized cascade:

Ligand Binding: TGF-β1, -β2, or -β3 binds to TGFBR2's extracellular domain

Type I Receptor Recruitment: The ligand-TGFBR2 complex recruits TGFBR1 (ALK5)

Trans-phosphorylation: TGFBR2 phosphorylates TGFBR1's kinase domain

SMAD Phosphorylation: Activated TGFBR1 phosphorylates SMAD2 and SMAD3

Complex Formation: Phosphorylated SMADs form complexes with SMAD4

Nuclear Translocation: SMAD complexes translocate to the nucleus

Gene Regulation: SMADs regulate transcription of target genes

This canonical SMAD pathway is the primary signaling mechanism, but TGFBR2 also activates non-SMAD pathways.

Non-SMAD Pathways

Beyond SMAD signaling, TGFBR2 activates:

MAPK Pathways: ERK, JNK, and p38 are activated by TGFBR2

PI3K/AKT: TGFBR2 can activate AKT through adapter proteins

TAK1 Pathway: TGF-β activates TAK1 through the TAB1/TAB2 complex

RhoA Pathway: TGF-β affects cytoskeletal dynamics through RhoA

These non-SMAD pathways contribute to the diverse biological effects of TGF-β.

TGF-β in the Brain

In the nervous system, TGF-β signaling through TGFBR2:

Neurotrophic Effects: TGF-β promotes neuron survival

Synaptic Modulation: TGF-β regulates synaptic plasticity

Glial Regulation: TGF-β modulates astrocyte and microglial function

BBB Maintenance: TGF-β maintains blood-brain barrier integrity

The multifaceted nature of TGF-β signaling makes it essential for nervous system function.

Role in Disease

Alzheimer's Disease

TGF-β signaling through TGFBR2 has complex, often contradictory roles in AD:

Neuroprotective Effects:

TGF-β protects neurons from [amyloid-β](/proteins/amyloid-beta) toxicity
TGF-β promotes neuronal survival through AKT signaling
TGF-β modulates [tau](/proteins/tau) phosphorylation
TGF-β supports synaptic function

Pathogenic Effects:

TGF-β can enhance neuroinflammation
TGF-β affects amyloid precursor protein processing
TGF-β may contribute to cerebral amyloid angiopathy
TGF-β promotes astrogliosis

The net effect of TGF-β in AD appears to be context-dependent, with beneficial effects in early disease but potentially harmful effects in later stages. This dual nature makes targeting TGF-β signaling challenging.

Parkinson's Disease

In [PD](/diseases/parkinsons-disease), TGFBR2 signaling affects:

Dopaminergic Neuron Survival: TGF-β protects dopaminergic neurons

Neuroinflammation: TGF-β modulates microglial responses

α-Synuclein Aggregation: TGF-β may affect aggregation

Mitochondrial Function: TGF-β supports mitochondrial health

Therapeutic strategies to enhance TGF-β signaling are being explored for PD.

Amyotrophic Lateral Sclerosis

In [ALS](/diseases/amyotrophic-lateral-sclerosis), TGFBR2 signaling shows:

Motor Neuron Survival: TGF-β protects motor neurons

Neuroinflammation: TGF-β has anti-inflammatory effects

Glial Reactivity: TGF-β modulates astrocyte function

Disease Progression: Altered TGF-β signaling in ALS

Some studies report that TGF-β is decreased in ALS, providing a rationale for TGF-β supplementation.

Multiple Sclerosis

In [MS](/diseases/multiple-sclerosis), TGFBR2 signaling is complex:

Demyelination: TGF-β affects remyelination

Immune Regulation: TGF-β has immunosuppressive effects

Lesion Pathology: TGF-β expression in MS lesions

Therapeutic Response: TGF-β modulators in MS treatment

Stroke

After [ischemic stroke](/diseases/stroke), TGFBR2 signaling:

Neuroprotection: TGF-β reduces infarct size

Inflammation: TGF-β modulates post-stroke inflammation

Angiogenesis: TGF-β promotes blood vessel formation

Recovery: TGF-β affects functional recovery

Therapeutic Targeting

Current therapeutic strategies targeting TGFBR2 and TGF-β include:

TGF-β Agonists: Recombinant TGF-β and small molecule activators

TGF-β Antagonists: Neutralizing antibodies and receptor blockers

Kinase Inhibitors: Small molecule kinase inhibitors

Gene Therapy: Viral vector-mediated TGFBR2 delivery

The challenge is achieving cell-type specific effects without systemic toxicity.

Interacting Proteins

TGFBR2 interacts with:

[TGFBR1 (ALK5](/proteins/tgfbr1-protein)) — Type I receptor
[SMAD2](/proteins/smad2-protein) — SMAD substrate
[SMAD3](/proteins/smad3-protein) — SMAD substrate
[SMAD4](/proteins/smad4-protein) — SMAD co-factor
[TGF-β1](/proteins/tgf-beta-1) — Ligand
[TGF-β2](/proteins/tgf-beta-2) — Ligand
[TGF-β3](/proteins/tgf-beta-3) — Ligand
[TAK1](/proteins/tak1-protein) — Non-SMAD pathway

Key Publications

[Tesseur et al., TGF-β and Alzheimer's disease (2006)](https://pubmed.ncbi.nlm.nih.gov/17032306/) — AD connection

[Kraft et al., TGF-β signaling in the brain (2010)](https://pubmed.ncbi.nlm.nih.gov/20089208/) — Brain signaling

[Engel et al., TGFBR2 in neuronal survival (2012)](https://pubmed.ncbi.nlm.nih.gov/21570788/) — Neuronal effects

[Pyun et al., TGF-β and neuroinflammation (2014)](https://pubmed.ncbi.nlm.nih.gov/24711205/) — Inflammation

[Tatli et al., TGFBR2 in Parkinson's disease (2016)](https://pubmed.ncbi.nlm.nih.gov/27510228/) — PD connection

[Endo et al., TGF-beta in ALS (2018)](https://pubmed.ncbi.nlm.nih.gov/29649715/) — ALS connection

[Chen et al., TGFBR2 and amyloid-beta (2019)](https://pubmed.ncbi.nlm.nih.gov/31152643/) — Aβ interaction

[Gonzalez et al., TGF-beta in glial cells (2020)](https://pubmed.ncbi.nlm.nih.gov/32024574/) — Glial function

Cross-Links

[TGFBR2 Gene](/genes/tgfbr2) — Gene page
[TGFBR1 Protein](/proteins/tgfbr1-protein) — Type I receptor
[TGF-β Signaling](/mechanisms/tgf-beta-signaling-pathway) — Pathway page
[Alzheimer's Disease](/diseases/alzheimers-disease) — Disease page
[Parkinson's Disease](/diseases/parkinsons-disease) — Disease page
[ALS](/diseases/amyotrophic-lateral-sclerosis) — Disease page
[Neuroinflammation](/mechanisms/neuroinflammation) — Mechanism page

References

[Tesseur et al., TGF-β and Alzheimer's disease (2006)](https://pubmed.ncbi.nlm.nih.gov/17032306/)

[Kraft et al., TGF-β signaling in the brain (2010)](https://pubmed.ncbi.nlm.nih.gov/20089208/)

[Engel et al., TGFBR2 in neuronal survival (2012)](https://pubmed.ncbi.nlm.nih.gov/21570788/)

[Pyun et al., TGF-β and neuroinflammation (2014)](https://pubmed.ncbi.nlm.nih.gov/24711205/)

[Tatli et al., TGFBR2 in Parkinson's disease (2016)](https://pubmed.ncbi.nlm.nih.gov/27510228/)

[Endo et al., TGF-beta in ALS (2018)](https://pubmed.ncbi.nlm.nih.gov/29649715/)

[Chen et al., TGFBR2 and amyloid-beta (2019)](https://pubmed.ncbi.nlm.nih.gov/31152643/)

[Gonzalez et al., TGF-beta in glial cells (2020)](https://pubmed.ncbi.nlm.nih.gov/32024574/)

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TGFBR2 Protein — Transforming Growth Factor Beta Receptor 2

TGFBR2 Protein — Transforming Growth Factor Beta Receptor 2

Introduction

TGFBR2 Protein — Transforming Growth Factor Beta Receptor 2

Introduction

Overview

Structure

Normal Function

TGF-β Signaling Cascade

Non-SMAD Pathways

TGF-β in the Brain

Role in Disease

Alzheimer's Disease

Parkinson's Disease

Amyotrophic Lateral Sclerosis

Multiple Sclerosis

Stroke

Therapeutic Targeting

Interacting Proteins

Key Publications

Cross-Links

See Also

References