Annotations: 7RNN

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
B [auth D]	SCOP2B Superfamily	ASICs transmembrane helices-like	8106441	3002854	SCOP2B (2022-06-29)
B [auth D]	SCOP2B Superfamily	ASICs transmembrane helices-like	8106442	3002854	SCOP2B (2022-06-29)
B [auth D]	SCOP2B Superfamily	Proton-activated chloride channel, extracellular domain-like	8106425	3002853	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)
A [auth C]	V-set_8	e7rnnC1	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: V-set_8	ECOD (1.6)
B [auth D]	ASC	e7rnnD1	A: beta sandwiches	X: Amiloride-sensitive cation channel 2 (From Topology)	H: Amiloride-sensitive cation channel 2 (From Topology)	T: Amiloride-sensitive cation channel 2	F: ASC	ECOD (1.6)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
A [auth C]	Heavy Chain	IGHV1	-	acid-sensing ion channel 1	SAbDab (2024-10-25)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A [auth C]	Nanobodies Nb.C1	-	-	-
B [auth D]	Acid-sensing ion channel 1	monoatomic cation transmembrane transporter activity gated channel activity monoatomic ion channel activity ligand-gated sodium channel activity sodium channel activity sodium ion transmembrane transporter activity ligand-gated channel activity ligand-gated monoatomic ion channel activity monoatomic cation channel activity passive transmembrane transporter activity inorganic molecular entity transmembrane transporter activity channel activity inorganic cation transmembrane transporter activity monoatomic ion transmembrane transporter activity transporter activity monoatomic cation transmembrane transporter activity gated channel activity monoatomic ion channel activity ligand-gated sodium channel activity sodium channel activity sodium ion transmembrane transporter activity ligand-gated channel activity ligand-gated monoatomic ion channel activity monoatomic cation channel activity passive transmembrane transporter activity inorganic molecular entity transmembrane transporter activity channel activity inorganic cation transmembrane transporter activity monoatomic ion transmembrane transporter activity transporter activity metal ion transmembrane transporter activity ligand-gated monoatomic cation channel activity transmembrane transporter activity pH-gated monoatomic ion channel activity monoatomic ion-gated channel activity	multicellular organismal process system process sensory perception of chemical stimulus sensory perception nervous system process sensory perception of taste sensory perception of sour taste trans-synaptic signaling regulation of biological process cellular localization neurotransmitter secretion transport signaling secretion multicellular organismal process system process sensory perception of chemical stimulus sensory perception nervous system process sensory perception of taste sensory perception of sour taste trans-synaptic signaling regulation of biological process cellular localization neurotransmitter secretion transport signaling secretion biological regulation cell-cell signaling export from cell neurotransmitter transport establishment of localization cell communication chemical synaptic transmission localization signal release from synapse synaptic signaling secretion by cell signal release anterograde trans-synaptic signaling establishment of localization in cell cellular process behavior learning or memory cognition memory cellular response to stimulus response to stimulus response to pH cellular response to pH response to abiotic stimulus cellular response to abiotic stimulus cellular response to environmental stimulus monoatomic ion transmembrane transport sodium ion transmembrane transport inorganic ion transmembrane transport metal ion transport inorganic cation transmembrane transport transmembrane transport monoatomic cation transmembrane transport monoatomic ion transport monoatomic cation transport sodium ion transport calcium ion transport calcium ion transmembrane transport regulation of biological quality regulation of membrane potential regulation of localization regulation of cellular process modulation of chemical synaptic transmission negative regulation of biological process negative regulation of transport negative regulation of neurotransmitter transport regulation of secretion by cell negative regulation of secretion negative regulation of cellular process negative regulation of secretion by cell regulation of signaling negative regulation of neurotransmitter secretion regulation of transport regulation of neurotransmitter transport regulation of secretion regulation of trans-synaptic signaling regulation of neurotransmitter secretion regulation of cell communication learning associative learning response to amine response to chemical response to nitrogen compound response to amphetamine behavioral defense response fear response behavioral fear response defense response response to stress multicellular organismal response to stress protein-containing complex organization protein trimerization cellular component organization cellular component biogenesis cellular component assembly protein homotrimerization protein complex oligomerization protein-containing complex assembly protein homooligomerization cellular component organization or biogenesis response to acidic pH	postsynaptic specialization membrane postsynaptic specialization synapse membrane plasma membrane cellular anatomical entity postsynaptic density membrane synaptic membrane cell periphery postsynaptic density postsynapse neuron to neuron synapse organelle cell junction postsynaptic specialization membrane postsynaptic specialization synapse membrane plasma membrane cellular anatomical entity postsynaptic density membrane synaptic membrane cell periphery postsynaptic density postsynapse neuron to neuron synapse organelle cell junction postsynaptic membrane asymmetric synapse plasma membrane region cell surface presynapse glutamatergic synapse membrane-bounded organelle intracellular organelle intracellular anatomical structure Golgi apparatus cytoplasm intracellular membrane-bounded organelle endomembrane system

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
B [auth D]	IPR020903	Epithelial sodium channel, conserved site	Conserved Site
B [auth D]	IPR004724	Epithelial sodium channel, chordates	Family
B [auth D]	IPR001873	Epithelial sodium channel	Family

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
B [auth D]	Pharos: P78348	brain ischemia Inflammation hypertensive disorder colorectal cancer medulloblastoma oligodendroglioma brain injury pilocytic astrocytoma

Membrane Protein Annotation: PDBTM PDBTM Database Homepage

Chains	External Link	Comment
B [auth D]	PDBTM	Annotated as membrane protein by PDBTM

Membrane Protein Annotation: MemProtMD MemProtMD Database Homepage

Chains	External Link	Comment
B [auth D]	MemProtMD	Annotated as membrane protein by MemProtMD

Membrane Protein Annotation: mpstruc mpstruc Database Homepage

Chains	Resource Link	Group	Subgroup	Protein
B [auth D]	mpstruc	TRANSMEMBRANE PROTEINS: ALPHA-HELICAL	Channels: Other Ion Channels	ASIC1a Acid-Sensing Ion Channel in complex with Nb.C1 nanobody

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.