Cav1.2 Protein
Introduction <table class="infobox infobox-protein">
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Cav1.2 Protein
Introduction <table class="infobox infobox-protein">
Cav1.2 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 Cav1.2 (encoded by CACNA1C) is the primary L-type voltage-gated calcium channel in [neurons](/entities/neurons) and cardiac myocytes. It couples electrical activity to biochemical signaling and plays essential roles in synaptic plasticity, gene transcription, and cellular excitability.
Structure Cav1.2 has the characteristic structure of high voltage-activated calcium channels:
Primary Structure : Single polypeptide of ~2,000 amino acidsDomain Organization : Four homologous domains (I-IV), each containing 6 transmembrane segmentsKey Regions :Voltage sensor : S4 segments with positively charged residuesDihydropyridine binding site : Between domains III and IVCaM binding domain : IQ motif in C-terminusAuxiliary Subunits : α2δ, β, γ subunits modulate functionNormal Function Cav1.2 mediates L-type calcium currents with distinct properties:
Synaptic Plasticity : Couples synaptic activity to CREB-mediated gene transcriptionDendritic Function : Regulates calcium in [dendritic spines](/cell-types/dendritic-spines) during [LTP](/mechanisms/long-term-potentiation)/LTDGene Expression : Activates calcium-dependent transcription factorsneuronal Development : Critical for dendritic growth and synapse formation
Role in Disease
Timothy Syndrome
Causative mutations (e.g., G406R) cause gain-of-functionProlonged channel opening leads to arrhythmias and autism
Severe neurodevelopmental phenotype
Psychiatric Disorders
GWAS associations with bipolar disorder, schizophrenia, major depressionRisk variants affect channel expression and splicing
May disrupt calcium signaling in cortical neurons
Alzheimer's Disease
Dysregulated Cav1.2 contributes to calcium homeostasis failure
[Amyloid-beta](/proteins/amyloid-beta) affects channel function
Target for calcium dysregulation correction
Parkinson's Disease
Protects dopaminergic neurons through regulated calcium influx
L-type blockers show neuroprotective potential
Therapeutic Targeting
Key Publications
Striessnig J, et al. (2010). L-type Ca2+ channel diseases. J Mol Neurosci .
Zamponi GW, et al. (2015). Calcium channel signaling. Nat Rev Neurosci .
Moosmang S, et al. (2005). Role of Cav1.2 in neuronal function. Brain Res Rev .
Background The study of Cav1.2 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.
References [^
Molecular Mechanisms
Calcium-Dependent Inactivation Cav1.2 channels exhibit unique calcium-dependent inactivation (CDI):
Calcium influx through the channel activates calmodulin
Calmodulin binds to IQ motif in C-terminus
This triggers channel closure during continued depolarization
CaMKII phosphorylates calmodulin, enhancing CDI
Alternative Splicing Multiple splice variants generate Cav1.2 diversity:
Exon 8/8a switching : Regulates voltage-dependenceExon 31/32 : Affects CDI strengthBrain-specific isoforms : Alternative C-terminal variantsPhosphorylation Sites Key phosphorylation sites include:
S1928 : PKA site, regulates traffickingT1704 : CaMKII site, modulates CDIS1512 : PKC site, alters gatingPathophysiology
Cardiac Effects
Increased Cav1.2 activity leads to prolonged QT interval
Reduced activity causes heart failure
Timothy syndrome: gain-of-function mutations
Neurological Effects
Dendritic Ca2+ signals for synaptic plasticity
Role in gene transcription via CREB
Dysregulation in AD and PD models
See Also
[CACNA1C Gene - Gene encoding this protein](/genes/cacna1c)
[CACNA1A Gene - Related P/Q-type channel](/genes/calcna1)
[L-type Calcium Channels - Protein family](/proteins/l-type-ca)
Calcium Channel Blockers - Therapeutic class
External Links
[UniProt: Cav1.2](https://www.uniprot.org/uniprot/Q13936)
[PDB: Cav1.2 structures](https://www.alphafold.ebi.ac.uk/entry/Q13936)
[NCBI Gene: CACNA1C](https://www.ncbi.nlm.nih.gov/gene/775)
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