2KAV
Solution structure of the human Voltage-gated Sodium Channel, brain isoform (Nav1.2)
Summary for 2KAV
Entry DOI | 10.2210/pdb2kav/pdb |
Related | 1byy 1qg9 |
NMR Information | BMRB: 16032 |
Descriptor | Sodium channel protein type 2 subunit alpha (1 entity in total) |
Functional Keywords | voltage-gated sodium channel, alternative splicing, disease mutation, epilepsy, glycoprotein, ion transport, ionic channel, membrane, polymorphism, sodium, sodium channel, sodium transport, transmembrane, transport, ubl conjugation, voltage-gated channel, transport protein, transport protein regulator |
Biological source | Homo sapiens (human) |
Cellular location | Membrane; Multi-pass membrane protein: Q99250 |
Total number of polymer chains | 1 |
Total formula weight | 14591.39 |
Authors | Miloushev, V.Z.,Levine, J.A.,Arbing, M.A.,Hunt, J.F.,Pitt, G.S.,Palmer, A.G. (deposition date: 2008-11-15, release date: 2009-01-06, Last modification date: 2024-05-22) |
Primary citation | Miloushev, V.Z.,Levine, J.A.,Arbing, M.A.,Hunt, J.F.,Pitt, G.S.,Palmer, A.G. Solution structure of the NaV1.2 C-terminal EF-hand domain. J.Biol.Chem., 284:6446-6454, 2009 Cited by PubMed Abstract: Voltage-gated sodium channels initiate the rapid upstroke of action potentials in many excitable tissues. Mutations within intracellular C-terminal sequences of specific channels underlie a diverse set of channelopathies, including cardiac arrhythmias and epilepsy syndromes. The three-dimensional structure of the C-terminal residues 1777-1882 of the human NaV1.2 voltage-gated sodium channel has been determined in solution by NMR spectroscopy at pH 7.4 and 290.5 K. The ordered structure extends from residues Leu-1790 to Glu-1868 and is composed of four alpha-helices separated by two short anti-parallel beta-strands; a less well defined helical region extends from residue Ser-1869 to Arg-1882, and a disordered N-terminal region encompasses residues 1777-1789. Although the structure has the overall architecture of a paired EF-hand domain, the NaV1.2 C-terminal domain does not bind Ca2+ through the canonical EF-hand loops, as evidenced by monitoring 1H,15N chemical shifts during aCa2+ titration. Backbone chemical shift resonance assignments and Ca2+ titration also were performed for the NaV1.5 (1773-1878) isoform, demonstrating similar secondary structure architecture and the absence of Ca2+ binding by the EF-hand loops. Clinically significant mutations identified in the C-terminal region of NaV1 sodium channels cluster in the helix I-IV interface and the helix II-III interhelical segment or in helices III and IV of the NaV1.2 (1777-1882) structure. PubMed: 19129176DOI: 10.1074/jbc.M807401200 PDB entries with the same primary citation |
Experimental method | SOLUTION NMR |
Structure validation
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