FEATURES

FAMILY

calcium channel alpha-1 subunit (TC 1.A.1.11) family

DESCRIPTION

Also known as CAC1B_HUMAN, CACNA1B, CACH5, CACNL1A5. Voltage-sensitive calcium channels (VSCC) mediate the entry of calcium ions into excitable cells and are also involved in a variety of calcium-dependent processes, including muscle contraction, hormone or neurotransmitter release, gene expression, cell motility, cell division and cell death. The isoform alpha-1B gives rise to N-type calcium currents. N-type calcium channels belong to the 'high-voltage activated' (HVA) group and are specifically blocked by omega-conotoxin-GVIA (AC P01522) (AC P01522) (By similarity). They are however insensitive to dihydropyridines (DHP). Calcium channels containing alpha-1B subunit may play a role in directed migration of immature neurons. Multisubunit complex consisting of alpha-1, alpha-2, beta and delta subunits in a 1:1:1:1 ratio. The channel activity is directed by the pore-forming and voltage-sensitive alpha-1 subunit. In many cases, this subunit is sufficient to generate voltage-sensitive calcium channel activity. The auxiliary subunits beta and alpha-2/delta linked by a disulfide bridge regulate the channel activity. Interacts with RIMS1. Interacts with FMR1 (via C-terminus); this interaction induces a decrease in the number of presynaptic functional CACNA1B channels at the cell surface. Interacts with the omega-conotoxin-GVIA (AC P01522) (By similarity).

EXTERNAL LINKS

CACNA1B

Voltage-dependent N-type calcium channel subunit alpha-1B

CACNA1B

Molecular Synopsis