Voltage-dependent N-type calcium channel subunit alpha-1B (CACNA1B) is a 2339-residue protein from Homo sapiens. This is its AlphaFold structure prediction, created 1 Aug 2025. UniProt accession: Q00975.
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The mean pLDDT of this model is 59.9 (low overall). pLDDT is AlphaFold's per-residue confidence score from 0 to 100. In MolViewer, choose the B-factor color scheme to color the model by pLDDT, because AlphaFold stores it in the B-factor column.
| pLDDT band | Meaning | Share of residues |
|---|---|---|
| Above 90 | Very high: backbone and side chains are usually accurate | 7% |
| 70 to 90 | Confident: backbone generally right | 40% |
| 50 to 70 | Low: treat with caution | 12% |
| Below 50 | Very low: often disordered regions | 41% |
What pLDDT means and how to read it
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. This alpha-1B subunit gives rise to N-type calcium currents. N-type calcium channels belong to the 'high-voltage activated' (HVA) group. They are involved in pain signaling (PubMed:25296916). Calcium channels containing alpha-1B subunit may play a role in directed migration of immature neurons. Mediates Ca(2+) release probability at hippocampal neuronal soma and synaptic terminals (By similarity)
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.…
Membrane
Compare the prediction with experimentally determined structures of the same protein:
| PDB ID | Method | Resolution | Chains and residues |
|---|---|---|---|
| 7VFS | EM | 2.8 Å | A=1-2339 |
| 7MIX | EM | 3.0 Å | A=1-2339 |
| 7VFU | EM | 3.0 Å | A=1-2339 |
| 7VFV | EM | 3.0 Å | A=1-2339 |
| 7MIY | EM | 3.1 Å | A=1-2339 |
| 7VFW | EM | 3.3 Å | A=1-2339 |
| 2LCM | NMR | A=1242-1269 |
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