Potassium voltage-gated channel subfamily A member 2 (Kcna2) is a 499-residue protein from Rattus norvegicus. This is its AlphaFold structure prediction, created 1 Aug 2025. UniProt accession: P63142.
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The mean pLDDT of this model is 77.4 (confident 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 | 56% |
| 70 to 90 | Confident: backbone generally right | 12% |
| 50 to 70 | Low: treat with caution | 9% |
| Below 50 | Very low: often disordered regions | 22% |
What pLDDT means and how to read it
Voltage-gated potassium channel that mediates transmembrane potassium transport in excitable membranes, primarily in the brain and the central nervous system, but also in the cardiovascular system. Prevents aberrant action potential firing and regulates neuronal output. Forms tetrameric potassium-selective channels through which potassium ions pass in accordance with their electrochemical gradient. The channel alternates between opened and closed conformations in response to the voltage difference across the membrane (PubMed:12151401, PubMed:21602278, PubMed:24472174). Can form functional homotetrameric channels and heterotetrameric channels that contain variable proportions of KCNA1,…
Homotetramer and heterotetramer with other channel-forming alpha subunits, such as KCNA1, KCNA4, KCNA5, KCNA6 and KCNA7 (PubMed:10896669, PubMed:11007484, PubMed:12632190, PubMed:12777451, PubMed:15618540, PubMed:16002581, PubMed:18004376, PubMed:20534430, PubMed:8361540, PubMed:8495559). Channel activity is regulated by interaction with beta subunits, including KCNAB1 and KCNAB2…
Cell membrane, Membrane, Cell projection, axon, Synapse, Synapse, synaptosome, Presynaptic cell membrane, Cell projection, dendrite, Endoplasmic reticulum membrane, Cell projection, lamellipodium membrane, Endosome, Perikaryon, Cell junction, paranodal septate junction
Compare the prediction with experimentally determined structures of the same protein:
| PDB ID | Method | Resolution | Chains and residues |
|---|---|---|---|
| 1DSX | X-ray | 1.6 Å | A/B/C/D/E/F/G/H=33-119 |
| 1QDV | X-ray | 1.6 Å | A/B/C/D=33-131 |
| 1QDW | X-ray | 2.1 Å | A/B/C/D/E/F/G/H=33-119 |
| 2R9R | X-ray | 2.4 Å | B/H=1-499 |
| 4JTA | X-ray | 2.5 Å | B/Q=1-266, B/Q=304-499 |
| 4JTD | X-ray | 2.54 Å | B/H=1-266, B/H=304-499 |
| 8VCH | EM | 2.55 Å | A/B/C/D=1-499 |
| 4JTC | X-ray | 2.56 Å | B/H=1-266, B/H=304-499 |
| 2A79 | X-ray | 2.9 Å | B=1-499 |
| 3LNM | X-ray | 2.9 Å | B/D=1-266, B/D=303-499 |
| 3LUT | X-ray | 2.9 Å | B=1-499 |
| 6EBL | EM | 3.0 Å | B/D/F/H=1-266, B/D/F/H=305-499 |
| 7SIZ | X-ray | 3.1 Å | B/D=1-499 |
| 8VC4 | EM | 3.17 Å | A/B/C/D=1-499 |
| 8VC6 | EM | 3.17 Å | A/B/C/D=1-499 |
| 8VC3 | EM | 3.2 Å | B/C/D/E=1-499 |
| 5WIE | X-ray | 3.3 Å | B/H=1-42 |
| 6EBK | EM | 3.3 Å | B/D/F/H=1-266, B/D/F/H=305-499 |
| 7SIT | X-ray | 3.32 Å | B/D=1-499 |
| 6EBM | EM | 4.0 Å | B/D/F/H=1-266, B/D/F/H=305-499 |
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