Annotations: 8K1Q

Human TWIK-related acid-sensitive potassium channel TASK3 at pH 6.0, 5 mM KCl and 135 mM NaCl

External Resource: Annotation

Domain Annotation: ECOD Classification
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Pharos: Disease Associations
Membrane Protein Annotation: PDBTM
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	DNA_topoisoIV	e8k1qB1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: DNA_topoisoIV	ECOD (v294.2)
A	DNA_topoisoIV	e8k1qA1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: DNA_topoisoIV	ECOD (v294.2)

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 9	monoatomic cation transmembrane transporter activity potassium ion transmembrane transporter activity monoatomic ion channel activity potassium ion leak channel activity potassium channel activity monoatomic cation channel activity passive transmembrane transporter activity narrow pore channel activity leak channel activity channel activity monoatomic ion transmembrane transporter activity transporter activity metal ion transmembrane transporter activity transmembrane transporter activity monoatomic cation transmembrane transporter activity potassium ion transmembrane transporter activity monoatomic ion channel activity potassium ion leak channel activity potassium channel activity monoatomic cation channel activity passive transmembrane transporter activity narrow pore channel activity leak channel activity channel activity monoatomic ion transmembrane transporter activity transporter activity metal ion transmembrane transporter activity transmembrane transporter activity sodium channel activity sodium ion transmembrane transporter activity protein heterodimerization activity protein binding binding protein dimerization activity cation binding ion binding metal ion binding small molecule binding identical protein binding gated channel activity outward rectifier potassium channel activity voltage-gated channel activity voltage-gated monoatomic ion channel activity voltage-gated monoatomic cation channel activity voltage-gated potassium channel activity	localization transport monoatomic ion transport potassium ion transport monoatomic cation transport establishment of localization metal ion transport regulation of resting membrane potential biological regulation regulation of biological quality regulation of membrane potential regulation of action potential regulation of biological process action potential localization transport monoatomic ion transport potassium ion transport monoatomic cation transport establishment of localization metal ion transport regulation of resting membrane potential biological regulation regulation of biological quality regulation of membrane potential regulation of action potential regulation of biological process action potential regulation of action potential firing rate multicellular organismal process sensory perception of light stimulus system process sensory perception nervous system process visual perception cellular response to stimulus response to stimulus response to pH cellular response to pH response to abiotic stimulus cellular process cellular response to acidic pH response to acidic pH cellular response to abiotic stimulus cellular response to environmental stimulus import into cell monoatomic ion transmembrane transport import across plasma membrane potassium ion transmembrane transport inorganic cation import across plasma membrane monoatomic cation transmembrane transport transmembrane transport inorganic ion import across plasma membrane potassium ion import across plasma membrane regulation of localization regulation of aldosterone secretion regulation of cellular process regulation of system process negative regulation of biological process negative regulation of transport negative regulation of lipid localization cell communication regulation of steroid hormone secretion negative regulation of secretion negative regulation of hormone secretion aldosterone secretion negative regulation of aldosterone secretion negative regulation of secretion by cell mineralocorticoid secretion negative regulation of steroid hormone secretion regulation of hormone levels lipid transport regulation of corticosteroid hormone secretion regulation of secretion lipid export from cell negative regulation of corticosteroid hormone secretion regulation of mineralocorticoid secretion negative regulation of multicellular organismal process regulation of endocrine process corticosteroid hormone secretion regulation of hormone secretion signaling negative regulation of signaling steroid hormone secretion regulation of lipid transport organic hydroxy compound transport hormone secretion negative regulation of cell communication secretion by cell regulation of secretion by cell signal release negative regulation of cellular process regulation of multicellular organismal process negative regulation of mineralocorticoid secretion regulation of signaling negative regulation of lipid transport secretion regulation of transport cell-cell signaling export from cell lipid localization endocrine process regulation of lipid localization macromolecule localization hormone transport regulation of cell communication	membrane-bounded organelle mitochondrial membrane intracellular anatomical structure organelle inner membrane mitochondrion membrane intracellular membrane-bounded organelle mitochondrial inner membrane intracellular organelle organelle envelope cellular anatomical structure organelle mitochondrial envelope cytoplasm membrane-bounded organelle mitochondrial membrane intracellular anatomical structure organelle inner membrane mitochondrion membrane intracellular membrane-bounded organelle mitochondrial inner membrane intracellular organelle organelle envelope cellular anatomical structure organelle mitochondrial envelope cytoplasm organelle membrane cell periphery plasma membrane somatodendritic compartment cell projection dendrite dendritic tree neuron projection plasma membrane bounded cell projection transport vesicle synapse intracellular vesicle endomembrane system presynapse cytoplasmic vesicle synaptic vesicle cell junction secretory vesicle vesicle exocytic vesicle

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR003280	Two pore domain potassium channel	Family
A, B	IPR003092	Two pore domain potassium channel, TASK family	Family
A, B	IPR013099	Potassium channel domain	Domain
A, B	IPR005407	Potassium channel subfamily K member 9	Family

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A, B	: Q9NPC2	Birk-Barel syndrome childhood absence epilepsy absence epilepsy intellectual disability juvenile absence epilepsy pilocytic astrocytoma glioblastoma malignant ependymoma osteosarcoma medulloblastoma ovarian cancer subependymal giant cell astrocytoma

Membrane Protein Annotation: PDBTM PDBTM Database Homepage

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

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	TWIK-related acid-sensitive K⁺ channel 3 (TASK3, K2P9.1), pH 7.4, 200 mM KCl

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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.