Annotations: 7ZDZ

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	Ribosomal_S28e	e7zdzA1	A: a/b three-layered sandwiches	X: RNase A-like	H: Cytochrome P450	T: Cytochrome P450	F: Ribosomal_S28e	ECOD (v294.1)
B	Ank+TRP_2+Ank_2	e7zdzB1	A: a/b three-layered sandwiches	X: RNase A-like	H: Cytochrome P450	T: Cytochrome P450	F: Ank+TRP_2+Ank_2	ECOD (v294.1)
C	Ank+TRP_2+Ank_2	e7zdzC1	A: a/b three-layered sandwiches	X: RNase A-like	H: Cytochrome P450	T: Cytochrome P450	F: Ank+TRP_2+Ank_2	ECOD (v294.1)
D	Ank+TRP_2+Ank_2	e7zdzD1	A: a/b three-layered sandwiches	X: RNase A-like	H: Cytochrome P450	T: Cytochrome P450	F: Ank+TRP_2+Ank_2	ECOD (v294.1)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B, C, D	PF01007	Inward rectifier potassium channel transmembrane domain (IRK)	Inward rectifier potassium channel transmembrane domain		Domain
A, B, C, D	PF17655	Inward rectifier potassium channel C-terminal domain (IRK_C)	Inward rectifier potassium channel C-terminal domain	This cytoplasmic C-terminal domain has an Ig fold.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B, C, D	Inward rectifier potassium channel 2	ion binding binding phosphatidylinositol-4,5-bisphosphate binding anion binding phosphatidylinositol bisphosphate binding phospholipid binding lipid binding phosphatidylinositol phosphate binding phosphatidylinositol binding small molecule binding inward rectifier potassium channel activity monoatomic cation transmembrane transporter activity gated channel activity monoatomic ion channel activity ion binding binding phosphatidylinositol-4,5-bisphosphate binding anion binding phosphatidylinositol bisphosphate binding phospholipid binding lipid binding phosphatidylinositol phosphate binding phosphatidylinositol binding small molecule binding inward rectifier potassium channel activity monoatomic cation transmembrane transporter activity gated channel activity monoatomic ion channel activity potassium ion transmembrane transporter activity voltage-gated channel activity voltage-gated monoatomic ion channel activity potassium channel activity voltage-gated monoatomic cation channel activity ligand-gated channel activity ligand-gated monoatomic ion channel activity monoatomic cation channel activity passive transmembrane transporter activity voltage-gated potassium channel activity channel activity monoatomic ion transmembrane transporter activity transporter activity metal ion transmembrane transporter activity ligand-gated monoatomic cation channel activity transmembrane transporter activity voltage-gated potassium channel activity involved in cardiac muscle cell action potential repolarization identical protein binding protein binding	potassium ion homeostasis inorganic ion homeostasis homeostatic process cellular homeostasis chemical homeostasis intracellular monoatomic cation homeostasis monoatomic ion homeostasis intracellular chemical homeostasis intracellular potassium ion homeostasis monoatomic cation homeostasis intracellular monoatomic ion homeostasis membrane depolarization during action potential membrane depolarization biological regulation potassium ion homeostasis inorganic ion homeostasis homeostatic process cellular homeostasis chemical homeostasis intracellular monoatomic cation homeostasis monoatomic ion homeostasis intracellular chemical homeostasis intracellular potassium ion homeostasis monoatomic cation homeostasis intracellular monoatomic ion homeostasis 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 regulation of actin filament-based process regulation of cellular process regulation of heart contraction regulation of system process cardiac muscle contraction striated muscle contraction circulatory system process actin filament-based process regulation of multicellular organismal process blood circulation cardiac muscle cell contraction regulation of biological process regulation of cardiac muscle contraction actin filament-based movement muscle contraction muscle system process regulation of muscle system process regulation of blood circulation regulation of striated muscle contraction regulation of actin filament-based movement regulation of muscle contraction regulation of cardiac muscle cell contraction cellular process actin-mediated cell contraction heart contraction relaxation of cardiac muscle relaxation of muscle cardiac muscle cell action potential involved in contraction 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 monoatomic cation transport regulation of resting membrane potential membrane repolarization regulation of membrane repolarization protein-containing complex organization protein homotetramerization cellular component organization cellular component biogenesis cellular component assembly protein complex oligomerization protein tetramerization protein-containing complex assembly protein homooligomerization cellular component organization or biogenesis membrane repolarization during action potential cellular response to stimulus response to stimulus response to mechanical stimulus response to external stimulus response to abiotic stimulus cellular response to mechanical stimulus cellular response to abiotic stimulus cellular response to external stimulus cellular response to environmental stimulus cardiac muscle cell membrane repolarization membrane repolarization during cardiac muscle cell action potential regulation of localization regulation of transport regulation of monoatomic ion transport regulation of monoatomic ion transmembrane transport regulation of transmembrane transport relaxation of skeletal muscle magnesium ion transport import into cell import across plasma membrane inorganic cation import across plasma membrane inorganic ion import across plasma membrane potassium ion import across plasma membrane multicellular organismal movement musculoskeletal movement regulation of skeletal muscle contraction by action potential regulation of skeletal muscle contraction regulation of action potential nervous system process neuromuscular process skeletal muscle contraction regulation of skeletal muscle contraction via regulation of action potential positive regulation of cation transmembrane transport regulation of potassium ion transport positive regulation of biological process positive regulation of monoatomic ion transport positive regulation of transmembrane transport positive regulation of monoatomic ion transmembrane transport regulation of metal ion transport positive regulation of cellular process regulation of potassium ion transmembrane transport positive regulation of potassium ion transport positive regulation of transport positive regulation of potassium ion transmembrane transport regulation of monoatomic cation transmembrane transport cardiac conduction regulation of heart rate by cardiac conduction regulation of heart rate	cell periphery postsynapse cellular anatomical structure postsynaptic membrane synapse cell junction membrane plasma membrane plasma membrane region synaptic membrane sarcolemma T-tubule glutamatergic synapse voltage-gated potassium channel complex cell periphery postsynapse cellular anatomical structure postsynaptic membrane synapse cell junction membrane plasma membrane plasma membrane region synaptic membrane sarcolemma T-tubule glutamatergic synapse voltage-gated potassium channel complex protein-containing complex plasma membrane protein complex potassium channel complex membrane protein complex cation channel complex transporter complex transmembrane transporter complex monoatomic ion channel complex neuron spine neuron projection dendritic spine plasma membrane bounded cell projection somatodendritic compartment cell projection dendrite dendritic tree cell body neuronal cell body cell-cell junction intercalated disc anchoring junction cell-cell contact zone

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B, C, D	IPR041647	Inward rectifier potassium channel, C-terminal	Domain
A, B, C, D	IPR040445	Potassium channel, inwardly rectifying, transmembrane domain	Domain
A, B, C, D	IPR016449	Potassium channel, inwardly rectifying, Kir	Family
A, B, C, D	IPR014756	Immunoglobulin E-set	Homologous Superfamily
A, B, C, D	IPR003271	Potassium channel, inwardly rectifying, Kir2.1	Family
A, B, C, D	IPR013673	Potassium channel, inwardly rectifying, Kir, N-terminal	Domain
A, B, C, D	IPR013518	Potassium channel, inwardly rectifying, Kir, cytoplasmic	Homologous Superfamily

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A, B, C, D	Pharos: P63252	Andersen-Tawil syndrome short QT syndrome type 3 familial atrial fibrillation atrial fibrillation, familial, 9 ventricular tachycardia long QT syndrome short QT syndrome Arsenic Poisoning short QT syndrome type 1 endometriosis familial periodic paralysis Graves disease interstitial cystitis adrenal cortex carcinoma lung adenocarcinoma Andersen-Tawil syndrome short QT syndrome type 3 familial atrial fibrillation atrial fibrillation, familial, 9 ventricular tachycardia long QT syndrome short QT syndrome Arsenic Poisoning short QT syndrome type 1 endometriosis familial periodic paralysis Graves disease interstitial cystitis adrenal cortex carcinoma lung adenocarcinoma malignant mesothelioma atrial fibrillation, familial, 1 pancreatic intraductal papillary-mucinous neoplasm with low grade dysplasia breast cancer sarcoidosis catecholaminergic polymorphic ventricular tachycardia Down syndrome ulcerative colitis exocrine pancreatic carcinoma gastric cancer heart disease invasive ductal breast carcinoma lung cancer malignant pancreatic neoplasm astrocytic tumor oligodendroglioma primitive neuroectodermal tumor cystic fibrosis skin disease ductal breast carcinoma in situ gastric carcinoma hepatocellular carcinoma malignant ependymoma medulloblastoma atrial fibrillation ovarian cancer autosomal dominant cardiac arrhythmia (Kuhn) psoriasis cardiomyopathy tuberculosis

Membrane Protein Annotation: OPM OPM Database Homepage

Chains	External Link	Type	Class	Superfamily	Family
A, B, C, D	OPM	Transmembrane	Alpha-helical polytopic	Ion channel (VIC) superfamily	ATP-sensitive K+ channel

Membrane Protein Annotation: PDBTM PDBTM Database Homepage

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

Membrane Protein Annotation: mpstruc mpstruc Database Homepage

Chains	Resource Link	Group	Subgroup	Protein
A, B, C, D	mpstruc	TRANSMEMBRANE PROTEINS: ALPHA-HELICAL	Channels: Potassium, Sodium, & Proton Ion-Selective	Kir2.1 Inward-Rectifier Potassium 2.1 Channel

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.