- PDB-9dbn: Tarantula venom peptide Protoxin-I bound to full-length human vol... -
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基本情報
登録情報
データベース: PDB / ID: 9dbn
タイトル
Tarantula venom peptide Protoxin-I bound to full-length human voltage-gated sodium channel 1.8 (NaV1.8)
要素
Beta/omega-theraphotoxin-Tp1a
Sodium channel protein type 10 subunit alpha
キーワード
MEMBRANE PROTEIN / ion channel
機能・相同性
機能・相同性情報
bundle of His cell action potential / AV node cell action potential / clathrin complex / regulation of atrial cardiac muscle cell membrane depolarization / membrane depolarization during action potential / voltage-gated monoatomic ion channel activity involved in regulation of presynaptic membrane potential / sensory perception / regulation of monoatomic ion transmembrane transport / cardiac muscle cell action potential involved in contraction / voltage-gated sodium channel complex ...bundle of His cell action potential / AV node cell action potential / clathrin complex / regulation of atrial cardiac muscle cell membrane depolarization / membrane depolarization during action potential / voltage-gated monoatomic ion channel activity involved in regulation of presynaptic membrane potential / sensory perception / regulation of monoatomic ion transmembrane transport / cardiac muscle cell action potential involved in contraction / voltage-gated sodium channel complex / Interaction between L1 and Ankyrins / voltage-gated sodium channel activity / Phase 0 - rapid depolarisation / odontogenesis of dentin-containing tooth / sodium channel regulator activity / regulation of cardiac muscle contraction / potassium channel regulator activity / calcium channel inhibitor activity / sodium ion transmembrane transport / regulation of heart rate / presynaptic membrane / toxin activity / transmembrane transporter binding / axon / glutamatergic synapse / extracellular exosome / extracellular region / plasma membrane 類似検索 - 分子機能
Huwentoxin-1 family / Ion channel inhibitory toxin / SCN5A-like, C-terminal IQ motif / Sodium ion transport-associated / Voltage-gated sodium channel alpha subunit, inactivation gate / Sodium ion transport-associated / Voltage gated sodium channel, alpha subunit / Voltage-gated cation channel calcium and sodium / Voltage-dependent channel domain superfamily / Ion transport domain / Ion transport protein 類似検索 - ドメイン・相同性
CHOLESTEROL / 1-O-OCTADECYL-SN-GLYCERO-3-PHOSPHOCHOLINE / Chem-P5S / 1,2-DIOLEOYL-SN-GLYCERO-3-PHOSPHOCHOLINE / Beta/omega-theraphotoxin-Tp1a / Sodium channel protein type 10 subunit alpha 類似検索 - 構成要素
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R35-GM142797
米国
引用
ジャーナル: Nat Commun / 年: 2025 タイトル: Structural basis of inhibition of human Na1.8 by the tarantula venom peptide Protoxin-I. 著者: Bryan Neumann / Stephen McCarthy / Shane Gonen / 要旨: Voltage-gated sodium channels (Nas) selectively permit diffusion of sodium ions across the cell membrane and, in excitable cells, are responsible for propagating action potentials. One of the nine ...Voltage-gated sodium channels (Nas) selectively permit diffusion of sodium ions across the cell membrane and, in excitable cells, are responsible for propagating action potentials. One of the nine human Na isoforms, Na1.8, is a promising target for analgesics, and selective inhibitors are of interest as therapeutics. One such inhibitor, the gating-modifier peptide Protoxin-I derived from tarantula venom, blocks channel opening by shifting the activation voltage threshold to more depolarized potentials, but the structural basis for this inhibition has not previously been determined. Using monolayer graphene grids, we report the cryogenic electron microscopy structures of full-length human apo-Na1.8 and the Protoxin-I-bound complex at 3.1 Å and 2.8 Å resolution, respectively. The apo structure shows an unexpected movement of the Domain I S4-S5 helix, and VSD was unresolvable. We find that Protoxin-I binds to and displaces the VSD S3-S4 linker, hindering translocation of the S4 helix during activation.