| Protein Name |
TRPC1 |
| Gene |
TRPC1 |
| UniProt ID |
P48995 |
| Molecular Weight |
~90 kDa (793 amino acids) |
| Subcellular Localization |
Plasma membrane, Endoplasmic reticulum |
| Protein Family |
TRP (Transient Receptor Potential) channel family, TRPC subfamily |
| Structure |
6 transmembrane domains, tetrameric assembly |
| Associated Diseases |
Alzheimer's Disease, Parkinson's Disease, Stroke |
TRPC1 (Transient Receptor Potential Canonical 1) is the founding member of the TRPC subfamily of non-selective calcium-permeable cation channels. Encoded by the TRPC1 gene, this channel is central to receptor-operated calcium entry and participates in diverse cellular signaling pathways [1][2].
TRPC1 can form homomeric channels or heteromeric assemblies with other TRPC family members (TRPC3, TRPC4, TRPC5, TRPC6, TRPC7), creating channels with distinct properties. The channel is expressed ubiquitously and is essential for normal cellular function [3].
TRPC1 forms tetramers with each subunit containing:
- N-terminal domain - Proline-rich region, TRPC-specific domain
- Ankyrin repeats - Protein interaction sites
- Transmembrane domain - 6 segments (S1-S6)
- TRP domain - Characteristic C-terminal helix
- C-terminal tail - Regulatory sites
-
Proline-Rich Domain (PRD)
- N-terminal interaction with SH3 domains
- Cytoskeletal anchoring
-
Ankyrin Repeat Domain
- Three ankyrin repeats
- Protein-protein interactions
-
Channel Pore
- Between S5 and S6
- Selectivity filter
- Site of mutations causing disease
TRPC1 is a non-selective cation channel:
- Permeates Ca²⁺, Na⁺, Mg²⁺
- Reversal potential near 0 mV
- Moderate unitary conductance (~40 pS)
TRPC1 is activated by:
-
GPCR Signaling
- PLCβ activation
- DAG production
- IP₃ receptor activation
-
Store-Operated Mechanisms
- ER calcium depletion
- STIM1 interaction
-
Mechanical Stimulation
- Membrane stretch
- Cell deformation
- Calcium influx pathway
- Membrane depolarization
- Signal transduction
- Cell proliferation
TRPC1 in AD:
-
Calcium Dyshomeostasis
- Dysregulated channel activity
- Enhanced amyloid-beta toxicity
-
Synaptic Impairment
- Altered synaptic plasticity
- Memory deficits
-
Neuronal Death
- Apoptotic pathways
- Excitotoxicity
In PD:
- Dopaminergic neuron involvement
- Oxidative stress responses
- Alpha-synuclein interactions
- Ischemic injury mechanisms
- Excitotoxic cell death
- Potential neuroprotection targets
TRPC1-targeting compounds include:
-
Antagonists
- 2-APB (broad TRPC modulator)
- SKF-96365
- Carboxyamidotriazole
-
Activators
- Store depletion
- GPCR agonists
- Developing selective compounds
- Understanding subunit composition
- Tissue-specific targeting
- Clapham et al., TRP channel review (2001)
- Berridge et al., Calcium signaling (2003)
- Bishnoi et al., TRPC1 in neurodegeneration (2008)
- TRPC1 protein function and disease associations