Annotations: 7K18

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
B	SCOP2B Superfamily	Scorpion toxin-like	8038186	3000309	SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
B	Toxin_3	e7k18B1	A: few secondary structure elements	X: omega toxin-like	H: omega toxin-related	T: Scorpion toxin-like	F: Toxin_3	ECOD (1.6)
A	Ion_trans	e7k18A3	A: alpha complex topology	X: Voltage-gated ion channels (From Topology)	H: Voltage-gated ion channels (From Topology)	T: Voltage-gated ion channels	F: Ion_trans	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	1.20.120.350	Mainly Alpha	Up-down Bundle	Four Helix Bundle (Hemerythrin (Met), subunit A)	Voltage-gated potassium channels. Chain C	CATH (utative)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
B	PF00537	Scorpion toxin-like domain (Toxin_3)	Scorpion toxin-like domain	This family contains both neurotoxins and plant defensins. The mustard trypsin inhibitor, MTI-2, is plant defensin. It is a potent inhibitor of trypsin with no activity towards chymotrypsin. MTI-2 is toxic for Lepidopteran insects, but has low activ ...	This family contains both neurotoxins and plant defensins. The mustard trypsin inhibitor, MTI-2, is plant defensin. It is a potent inhibitor of trypsin with no activity towards chymotrypsin. MTI-2 is toxic for Lepidopteran insects, but has low activity against aphids [1]. Brazzein is plant defensin-like protein. It is pH-stable, heat-stable and intensely sweet protein [2]. The scorpion toxin (a neurotoxin) binds to sodium channels and inhibits the activation mechanisms of the channels, thereby blocking neuronal transmission. Scorpion toxins bind to sodium channels and inhibit the activation mechanisms of the channels, thereby blocking neuronal transmission	Domain
A	PF00520	Ion transport protein (Ion_trans)	Ion transport protein	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
B	Alpha-like toxin Lqh3	molecular function inhibitor activity sodium channel inhibitor activity channel regulator activity transporter inhibitor activity ion channel regulator activity ion channel inhibitor activity molecular function regulator activity sodium channel regulator activity transporter regulator activity channel inhibitor activity toxin activity	response to stimulus defense response response to stress	cellular anatomical structure extracellular region
A	Sodium channel protein type 5 subunit alpha, Enhanced Green fluorescent protein	monoatomic cation transmembrane transporter activity voltage-gated sodium channel activity involved in cardiac muscle cell action potential voltage-gated sodium channel activity monoatomic ion channel activity sodium channel activity sodium ion transmembrane transporter activity monoatomic cation channel activity passive transmembrane transporter activity channel activity voltage-gated sodium channel activity involved in AV node cell action potential monoatomic ion transmembrane transporter activity transporter activity metal ion transmembrane transporter activity transmembrane transporter activity monoatomic cation transmembrane transporter activity voltage-gated sodium channel activity involved in cardiac muscle cell action potential voltage-gated sodium channel activity monoatomic ion channel activity sodium channel activity sodium ion transmembrane transporter activity monoatomic cation channel activity passive transmembrane transporter activity channel activity voltage-gated sodium channel activity involved in AV node cell action potential monoatomic ion transmembrane transporter activity transporter activity metal ion transmembrane transporter activity transmembrane transporter activity cytoskeletal protein binding ankyrin binding protein binding binding fibroblast growth factor binding growth factor binding calmodulin binding ubiquitin protein ligase binding ubiquitin-like protein ligase binding enzyme binding nitric-oxide synthase binding voltage-gated sodium channel activity involved in bundle of His cell action potential protein domain specific binding voltage-gated sodium channel activity involved in SA node cell action potential voltage-gated sodium channel activity involved in Purkinje myocyte action potential scaffold protein binding transmembrane transporter binding kinase binding protein kinase binding	membrane depolarization during action potential membrane depolarization biological regulation membrane depolarization during cardiac muscle cell action potential action potential regulation of biological quality cardiac muscle cell action potential regulation of membrane potential heart process multicellular organismal process system process cardiac muscle cell action potential involved in contraction signaling atrial cardiac muscle cell to AV node cell signaling membrane depolarization during action potential membrane depolarization biological regulation membrane depolarization during cardiac muscle cell action potential action potential regulation of biological quality cardiac muscle cell action potential regulation of membrane potential heart process multicellular organismal process system process cardiac muscle cell action potential involved in contraction signaling atrial cardiac muscle cell to AV node cell signaling regulation of heart contraction regulation of system process cell-cell signaling involved in cardiac conduction cardiac muscle contraction striated muscle contraction cell communication circulatory system process actin filament-based process regulation of multicellular organismal process atrial cardiac muscle cell to AV node cell communication cell communication involved in cardiac conduction blood circulation cardiac muscle cell contraction regulation of biological process atrial cardiac muscle cell action potential cell-cell signaling actin filament-based movement muscle contraction muscle system process regulation of blood circulation membrane depolarization during atrial cardiac muscle cell action potential cardiac conduction cellular process actin-mediated cell contraction heart contraction positive regulation of biological process positive regulation of heart rate positive regulation of blood circulation positive regulation of heart contraction positive regulation of multicellular organismal process regulation of heart rate developmental process anatomical structure development brainstem development AV node cell to bundle of His cell communication regulation of cellular process regulation of membrane depolarization regulation of ventricular cardiac muscle cell membrane depolarization bundle of His cell to Purkinje myocyte signaling bundle of His cell to Purkinje myocyte communication bundle of His cell action potential regulation of atrial cardiac muscle cell membrane depolarization cardiac muscle cell membrane repolarization membrane repolarization regulation of membrane repolarization ventricular cardiac muscle cell membrane repolarization regulation of cardiac muscle cell membrane repolarization regulation of ventricular cardiac muscle cell membrane repolarization AV node cell action potential AV node cell to bundle of His cell signaling head development animal organ development brain development nervous system development multicellular organism development cerebellum development central nervous system development metencephalon development hindbrain development system development cellular response to stimulus cellular response to metal ion cellular response to chemical stimulus response to stimulus response to metal ion response to chemical cellular response to calcium ion response to calcium ion Purkinje myocyte to ventricular cardiac muscle cell communication membrane depolarization during Purkinje myocyte cell action potential Purkinje myocyte action potential Purkinje myocyte to ventricular cardiac muscle cell signaling localization transport monoatomic ion transport monoatomic cation transport establishment of localization sodium ion transport metal ion transport regulation of muscle adaptation regulation of muscle system process response to muscle inactivity response to stimulus involved in regulation of muscle adaptation muscle adaptation response to denervation involved in regulation of muscle adaptation regulation of response to stimulus response to muscle inactivity involved in regulation of muscle adaptation response to inactivity regulation of heart rate by cardiac conduction ventricular cardiac muscle cell action potential regulation of actin filament-based process regulation of cardiac muscle contraction regulation of striated muscle contraction regulation of actin filament-based movement regulation of muscle contraction regulation of cardiac muscle cell contraction membrane depolarization during AV node cell action potential anatomical structure morphogenesis odontogenesis of dentin-containing tooth odontogenesis animal organ morphogenesis SA node cell to atrial cardiac muscle cell signaling SA node cell to atrial cardiac muscle cell communication SA node cell action potential membrane depolarization during SA node cell action potential cell population proliferation positive regulation of cell population proliferation positive regulation of epithelial cell proliferation regulation of cell population proliferation regulation of epithelial cell proliferation epithelial cell proliferation positive regulation of cellular process monoatomic ion transmembrane transport sodium ion transmembrane transport monoatomic cation transmembrane transport transmembrane transport heart development cardiac chamber development cardiac ventricle development circulatory system development regulation of action potential positive regulation of action potential nervous system process transmission of nerve impulse neuronal action potential regulation of localization regulation of monoatomic ion transmembrane transport regulation of sodium ion transport regulation of sodium ion transmembrane transport regulation of metal ion transport regulation of transport regulation of monoatomic ion transport regulation of transmembrane transport regulation of monoatomic cation transmembrane transport import into cell import across plasma membrane sodium ion import across plasma membrane inorganic cation import across plasma membrane inorganic ion import across plasma membrane forebrain development telencephalon development atrial cardiac muscle cell membrane repolarization regulation of atrial cardiac muscle cell membrane repolarization positive regulation of sodium ion transport positive regulation of transport positive regulation of monoatomic ion transport membrane depolarization during bundle of His cell action potential bioluminescence metabolic process generation of precursor metabolites and energy	cell periphery cellular anatomical structure sarcolemma plasma membrane membrane T-tubule intracellular anatomical structure intracellular membraneless organelle Z disc sarcomere intracellular organelle I band organelle membraneless organelle cell periphery cellular anatomical structure sarcolemma plasma membrane membrane T-tubule intracellular anatomical structure intracellular membraneless organelle Z disc sarcomere intracellular organelle I band organelle membraneless organelle contractile muscle fiber cytoplasm supramolecular fiber myofibril supramolecular polymer supramolecular complex protein-containing complex sodium channel complex transmembrane transporter complex membrane protein complex cation channel complex transporter complex monoatomic ion channel complex perinuclear region of cytoplasm axon cell projection neuron projection plasma membrane bounded cell projection cell-cell junction intercalated disc anchoring junction cell junction cell-cell contact zone cell surface membrane microdomain membrane raft plasma membrane raft plasma membrane region caveola voltage-gated sodium channel complex plasma membrane protein complex lateral plasma membrane membrane-bounded organelle endoplasmic reticulum intracellular membrane-bounded organelle endomembrane system

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
B	IPR036574	Knottin, scorpion toxin-like superfamily	Homologous Superfamily
B	IPR018218	Scorpion long chain toxin	Family
B	IPR002061	Scorpion long chain toxin/defensin	Family
B	IPR003614	Knottins-like	Domain
B	IPR044062	LCN-type cysteine-stabilized alpha/beta (CS-alpha/beta) domain	Domain
A	IPR010526	Sodium ion transport-associated domain	Domain
A	IPR043203	Voltage-gated cation channel calcium and sodium	Family
A	IPR008053	Voltage gated sodium channel, alpha-5 subunit	Family
A	IPR024583	Voltage-gated Na+ ion channel, cytoplasmic domain	Domain
A	IPR001696	Voltage gated sodium channel, alpha subunit	Family
A	IPR005821	Ion transport domain	Domain
A	IPR044564	Voltage-gated sodium channel alpha subunit, inactivation gate	Domain
A	IPR027359	Voltage-dependent channel domain superfamily	Homologous Superfamily
A	IPR000786	Green fluorescent protein, GFP	Family
A	IPR011584	Green fluorescent protein-related	Family
A	IPR009017	Green fluorescent protein	Homologous Superfamily

Membrane Protein Annotation: OPM OPM Database Homepage

Chains	External Link	Type	Class	Superfamily	Family
A	OPM	Transmembrane	Alpha-helical polytopic	Ion channel (VIC) superfamily	Voltage-gated calcium and sodium channels

Membrane Protein Annotation: PDBTM PDBTM Database Homepage

Chains	External Link	Comment
A	PDBTM	Annotated as membrane protein by PDBTM

Membrane Protein Annotation: mpstruc mpstruc Database Homepage

Chains	Resource Link	Group	Subgroup	Protein
A	mpstruc	TRANSMEMBRANE PROTEINS: ALPHA-HELICAL	Channels: Potassium, Sodium, & Proton Ion-Selective	Na_V1.5 cardiac sodium channel with bound α-toxin LqhIII from deathstalker scorpion

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729.