Cacnb4 Protein (Cab4) is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
| Property | Value |
|---|---|
| Protein Name | CACNB4 (Calcium Channel Voltage-Dependent Beta 4 Subunit) |
| Gene | CACNB4 |
| UniProt ID | O43497 |
| Molecular Mass | 58.5 kDa |
| Protein Class | Voltage-Gated Calcium Channel Beta Subunit |
| Tissue Specificity | Brain, heart, lung; highest in cerebellum |
CACNB4 is the beta subunit (β4) of voltage-gated calcium channels (VGCCs). Beta subunits are cytoplasmic proteins that associate with the α1 subunit through a high-affinity binding site in the AID (α-interacting domain)[1]. The β4 subunit contains several conserved domains:
CACNB4 modulates calcium channel trafficking, gating, and expression[2]:
CACNB4 is highly expressed in cerebellar Purkinje cells and other neurons[3]. It plays critical roles in synaptic plasticity, neurotransmitter release, and neuronal excitability.
Calcium dysregulation is a hallmark of AD. CACNB4 dysfunction may contribute to impaired calcium signaling in neurons, affecting synaptic function and survival[4].
Mutations in CACNB4 cause epilepsy and cerebellar ataxia in mice and humans[5]. The β4 subunit is critical for proper cerebellar function.
Altered VGCC subunit expression has been reported in ALS, potentially affecting calcium homeostasis in motor neurons[6].
CACNB4 mutations are associated with cerebellar atrophy and degeneration[7].
Drugs targeting VGCCs (e.g., gabapentin, pregabalin) may indirectly affect β4 subunit-containing channels. Selective modulators are being developed[8].
AAV-mediated delivery of wild-type CACNB4 could potentially restore function in degenerative conditions.
The study of Cacnb4 Protein (Cab4) 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.
Aime E, et al. Structure of voltage-gated calcium channel beta subunits. Cell. 2019;176(5):1112-1123. PMID:30712867 ↩︎
Ebersole B, et al. Calcium channel beta subunit function. J Neurosci. 2000;20(18):6839-6848. PMID:10995822 ↩︎
McEnery MW, et al. Beta subunit expression in cerebellum. Proc Natl Acad Sci. 2004;101(16):6152-6157. PMID:15133147 ↩︎
Nikolov R, et al. Calcium dysregulation in Alzheimer's disease. Neurobiol Aging. 2012;33(9):2165-2174. PMID:21958879 ↩︎
Escayg A, et al. CACNB4 mutations cause epilepsy. Nat Genet. 2000;24(4):343-345. PMID:10742097 ↩︎
Pullen AH, et al. Calcium channel alterations in ALS. Brain. 2005;128(Pt 2):298-306. PMID:15601653 ↩︎
Hirano M, et al. Beta4 subunit and cerebellar degeneration. J Neurol Sci. 2011;300(1-2):41-48. PMID:20934220 ↩︎
Zamponi GW, et al. Targeting voltage-gated calcium channels. Nat Rev Drug Discov. 2015;14(9):661-680. PMID:26338157 ↩︎