Annotations: 7SK0

TWIK1 in MSP1D1 lipid nanodisc at pH 7.4

External Resource: Annotation

Domain Annotation: ECOD Classification
Domain Annotation: CATH
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Membrane Protein Annotation: OPM
Membrane Protein Annotation: PDBTM
Membrane Protein Annotation: MemProtMD
Membrane Protein Annotation: mpstruc

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
B	Sybindin	e7sk0B1	A: beta barrels	X: Nuclear receptor ligand-binding domain	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: Sybindin	ECOD (v294.2)
A	Sybindin	e7sk0A1	A: beta barrels	X: Nuclear receptor ligand-binding domain	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: Sybindin	ECOD (v294.2)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
B	1.10.287.70	Mainly Alpha	Orthogonal Bundle	Helix Hairpins		CATH (utative)
A	1.10.287.70	Mainly Alpha	Orthogonal Bundle	Helix Hairpins		CATH (utative)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF07885	Ion channel (Ion_trans_2)	Ion channel	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	Potassium channel subfamily K member 1	monoatomic cation transmembrane transporter activity potassium ion transmembrane transporter activity monoatomic ion channel activity potassium channel activity monoatomic cation channel activity passive transmembrane transporter activity channel activity monoatomic ion transmembrane transporter activity transporter activity metal ion transmembrane transporter activity transmembrane transporter activity protein heterodimerization activity protein binding binding monoatomic cation transmembrane transporter activity potassium ion transmembrane transporter activity monoatomic ion channel activity potassium channel activity monoatomic cation channel activity passive transmembrane transporter activity channel activity monoatomic ion transmembrane transporter activity transporter activity metal ion transmembrane transporter activity transmembrane transporter activity protein heterodimerization activity protein binding binding protein dimerization activity gated channel activity voltage-gated monoatomic ion channel activity involved in regulation of postsynaptic membrane potential voltage-gated channel activity voltage-gated monoatomic ion channel activity potassium ion leak channel activity narrow pore channel activity leak channel activity sodium channel activity sodium ion transmembrane transporter activity ligand-gated channel activity inward rectifier potassium channel activity voltage-gated monoatomic cation channel activity ligand-gated monoatomic ion channel activity voltage-gated potassium channel activity ligand-gated monoatomic cation channel activity identical protein binding	transport monoatomic ion transmembrane transport potassium ion transmembrane transport establishment of localization metal ion transport monoatomic cation transmembrane transport transmembrane transport localization monoatomic ion transport potassium ion transport cellular process monoatomic cation transport regulation of resting membrane potential biological regulation transport monoatomic ion transmembrane transport potassium ion transmembrane transport establishment of localization metal ion transport monoatomic cation transmembrane transport transmembrane transport localization monoatomic ion transport potassium ion transport cellular process monoatomic cation transport regulation of resting membrane potential biological regulation regulation of biological quality regulation of membrane potential organic anion transport nitrogen compound transport carboxylic acid transport secretion export from cell organic acid transport amino acid transport acidic amino acid transport secretion by cell dicarboxylic acid transport glutamate secretion chloride transport chloride transmembrane transport monoatomic anion transport monoatomic anion transmembrane transport inorganic anion transport cellular response to stimulus response to stimulus response to pH cellular response to pH response to abiotic stimulus cellular response to acidic pH response to acidic pH cellular response to abiotic stimulus cellular response to environmental stimulus sodium ion transmembrane transport sodium ion transport response to chemical response to nicotine	somatodendritic compartment cell body cellular anatomical structure perikaryon neuronal cell body membrane cell periphery plasma membrane synapse cell junction plasma membrane region synaptic membrane apical part of cell apical plasma membrane somatodendritic compartment cell body cellular anatomical structure perikaryon neuronal cell body membrane cell periphery plasma membrane synapse cell junction plasma membrane region synaptic membrane apical part of cell apical plasma membrane cell projection dendrite dendritic tree neuron projection plasma membrane bounded cell projection protein-containing complex transmembrane transporter complex potassium channel complex membrane protein complex cation channel complex transporter complex monoatomic ion channel complex membrane-bounded organelle intracellular anatomical structure endosome intracellular vesicle intracellular membrane-bounded organelle endomembrane system intracellular organelle cytoplasmic vesicle organelle cytoplasm vesicle recycling endosome brush border membrane cluster of actin-based cell projections brush border cell projection membrane voltage-gated potassium channel complex plasma membrane protein complex inward rectifier potassium channel complex

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR013099	Potassium channel domain	Domain
A, B	IPR003280	Two pore domain potassium channel	Family
A, B	IPR005408	Two pore domain potassium channel, TWIK family	Family
A, B	IPR003092	Two pore domain potassium channel, TASK family	Family
A, B	IPR001779	Two pore domain potassium channel, TWIK-1	Family

Membrane Protein Annotation: OPM OPM Database Homepage

Chains	External Link	Type	Class	Superfamily	Family
A, B	OPM	Transmembrane	Alpha-helical polytopic	Ion channel (VIC) superfamily	NaK channel

Membrane Protein Annotation: PDBTM PDBTM Database Homepage

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

Membrane Protein Annotation: MemProtMD MemProtMD Database Homepage

Chains	External Link	Comment
A, B	MemProtMD	Annotated as membrane protein by MemProtMD

Membrane Protein Annotation: mpstruc mpstruc Database Homepage

Chains	Resource Link	Group	Subgroup	Protein
A, B	mpstruc	TRANSMEMBRANE PROTEINS: ALPHA-HELICAL	Channels: Potassium, Sodium, & Proton Ion-Selective	Two-Pore Domain Potassium Channel K_2P1.1 (TWIK-1) in MSP1D1 lipid nanodisc, pH 7.4

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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. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.