Identification of Navβ1 residues involved in the modulation of the sodium channel Nav1.4

Voltage-gated sodium channels (VGSCs) are heteromeric protein complexes that initiate action potentials in excitable cells. The voltage-gated sodium channel accessory subunit, Navβ1, allosterically modulates the α subunit pore structure upon binding. To date, the molecular determinants of the interf...

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Veröffentlicht in:PloS one 2013-12, Vol.8 (12), p.e81995
Hauptverfasser: Islas, Angel A, Sánchez-Solano, Alfredo, Scior, Thomas, Millan-PerezPeña, Lourdes, Salinas-Stefanon, Eduardo M
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container_issue 12
container_start_page e81995
container_title PloS one
container_volume 8
creator Islas, Angel A
Sánchez-Solano, Alfredo
Scior, Thomas
Millan-PerezPeña, Lourdes
Salinas-Stefanon, Eduardo M
description Voltage-gated sodium channels (VGSCs) are heteromeric protein complexes that initiate action potentials in excitable cells. The voltage-gated sodium channel accessory subunit, Navβ1, allosterically modulates the α subunit pore structure upon binding. To date, the molecular determinants of the interface remain unknown. We made use of sequence, knowledge and structure-based methods to identify residues critical to the association of the α and β1 Nav1.4 subunits. The Navβ1 point mutant C43A disrupted the modulation of voltage dependence of activation and inactivation and delayed the peak current decay, the recovery from inactivation, and induced a use-dependent decay upon depolarisation at 1 Hz. The Navβ1 mutant R89A selectively delayed channel inactivation and recovery from inactivation and had no effect on voltage dependence or repetitive depolarisations. Navβ1 mutants Y32A and G33M selectively modified the half voltage of inactivation without altering the kinetics. Despite low sequence identity, highly conserved structural elements were identified. Our models were consistent with published data and may help relate pathologies associated with VGSCs to the Navβ1 subunit.
doi_str_mv 10.1371/journal.pone.0081995
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The voltage-gated sodium channel accessory subunit, Navβ1, allosterically modulates the α subunit pore structure upon binding. To date, the molecular determinants of the interface remain unknown. We made use of sequence, knowledge and structure-based methods to identify residues critical to the association of the α and β1 Nav1.4 subunits. The Navβ1 point mutant C43A disrupted the modulation of voltage dependence of activation and inactivation and delayed the peak current decay, the recovery from inactivation, and induced a use-dependent decay upon depolarisation at 1 Hz. The Navβ1 mutant R89A selectively delayed channel inactivation and recovery from inactivation and had no effect on voltage dependence or repetitive depolarisations. Navβ1 mutants Y32A and G33M selectively modified the half voltage of inactivation without altering the kinetics. Despite low sequence identity, highly conserved structural elements were identified. 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The voltage-gated sodium channel accessory subunit, Navβ1, allosterically modulates the α subunit pore structure upon binding. To date, the molecular determinants of the interface remain unknown. We made use of sequence, knowledge and structure-based methods to identify residues critical to the association of the α and β1 Nav1.4 subunits. The Navβ1 point mutant C43A disrupted the modulation of voltage dependence of activation and inactivation and delayed the peak current decay, the recovery from inactivation, and induced a use-dependent decay upon depolarisation at 1 Hz. The Navβ1 mutant R89A selectively delayed channel inactivation and recovery from inactivation and had no effect on voltage dependence or repetitive depolarisations. Navβ1 mutants Y32A and G33M selectively modified the half voltage of inactivation without altering the kinetics. Despite low sequence identity, highly conserved structural elements were identified. Our models were consistent with published data and may help relate pathologies associated with VGSCs to the Navβ1 subunit.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>24358138</pmid><doi>10.1371/journal.pone.0081995</doi><oa>free_for_read</oa></addata></record>
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subjects Action Potentials - physiology
Amino acids
Animals
Chemical bonds
Conserved sequence
Deactivation
Decay
Depolarization
Electric potential
Female
Identification methods
Immunoglobulins
Inactivation
Ion Channel Gating - physiology
Kinetics
Laboratory animals
Mammals
Models, Molecular
Modulation
Molecular structure
Mutagenesis
Mutagenesis, Site-Directed
Mutants
Mutation
Oocytes - metabolism
Patch-Clamp Techniques
Porosity
Protein Conformation
Protein Subunits - genetics
Protein Subunits - metabolism
Proteins
Recovery
Residues
Sodium
Sodium channels (voltage-gated)
Sodium Channels - genetics
Sodium Channels - metabolism
Structural members
Studies
Xenopus laevis
title Identification of Navβ1 residues involved in the modulation of the sodium channel Nav1.4
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