RGD Reference Report - Alternative splicing in the cytoplasmic II-III loop of the N-type Ca channel alpha 1B subunit: functional differences are beta subunit-specific. - Rat Genome Database

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Alternative splicing in the cytoplasmic II-III loop of the N-type Ca channel alpha 1B subunit: functional differences are beta subunit-specific.

Authors: Pan, JQ  Lipscombe, D 
Citation: Pan JQ and Lipscombe D, J Neurosci 2000 Jul 1;20(13):4769-75.
RGD ID: 1299351
Pubmed: PMID:10864934   (View Abstract at PubMed)
PMCID: PMC6772276   (View Article at PubMed Central)

Structural diversity of voltage-gated Ca channels underlies much of the functional diversity in Ca signaling in neurons. Alternative splicing is an important mechanism for generating structural variants within a single gene family. In this paper, we show the expression pattern of an alternatively spliced 21 amino acid encoding exon in the II-III cytoplasmic loop region of the N-type Ca channel alpha(1B) subunit and assess its functional impact. Exon-containing alpha(1B) mRNA dominated in sympathetic ganglia and was present in approximately 50% of alpha(1B) mRNA in spinal cord and caudal regions of the brain and in the minority of alpha(1B) mRNA in neocortex, hippocampus, and cerebellum (<20%). The II-III loop exon affected voltage-dependent inactivation of the N-type Ca channel. Steady-state inactivation curves were shifted to more depolarized potentials without affects on either the rate or voltage dependence of channel opening. Differences in voltage-dependent inactivation between alpha(1B) splice variants were most clearly manifested in the presence of Ca channel beta(1b) or beta(4), rather than beta(2a) or beta(3), subunits. Our results suggest that exon-lacking alpha(1B) splice variants that associate with beta(1b) and beta(4) subunits will be susceptible to voltage-dependent inactivation at voltages in the range of neuronal resting membrane potentials (-60 to -80 mV). In contrast, alpha(1B) splice variants that associate with either beta(2a) or beta(3) subunits will be relatively resistant to inactivation at these voltages. The potential to mix and match multiple alpha(1B) splice variants and beta subunits probably represents a mechanism for controlling the plasticity of excitation-secretion coupling at different synapses.



Gene Ontology Annotations    Click to see Annotation Detail View

Biological Process

  
Object SymbolSpeciesTermQualifierEvidenceWithNotesSourceOriginal Reference(s)
Cacna1bRatcalcium ion transport  IMP  RGD 

Molecular Function

  
Object SymbolSpeciesTermQualifierEvidenceWithNotesSourceOriginal Reference(s)
Cacna1bRatvoltage-gated calcium channel activity  IMP  RGD 

Objects Annotated

Genes (Rattus norvegicus)
Cacna1b  (calcium voltage-gated channel subunit alpha1 B)


Additional Information