Annotations: 8TG9

Complex of NPR1 ectodomain with ANP plus an allosteric activating antibody, REGN5381

External Resource: Annotation

Domain Annotation: ECOD Classification
SAbDab Antibody Annotation
Thera-SAbDab Antibody Annotation
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Pharos: Disease Associations

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
B	CoV_NSP10	e8tg9B1	A: alpha arrays	X: HTH	H: HTH	T: Three-helical HTH	F: CoV_NSP10	ECOD (v295)
A	BRCT_2	e8tg9A01	A: alpha arrays	X: HTH	H: HTH	T: Three-helical HTH	F: BRCT_2	ECOD (v295)
G [auth F]	CoV_NSP10	e8tg9F1	A: alpha arrays	X: HTH	H: HTH	T: Three-helical HTH	F: CoV_NSP10	ECOD (v295)
E [auth L]	BRCT_2	e8tg9L01	A: alpha arrays	X: HTH	H: HTH	T: Three-helical HTH	F: BRCT_2	ECOD (v295)
D [auth H]	BRCT_2	e8tg9H01	A: alpha arrays	X: HTH	H: HTH	T: Three-helical HTH	F: BRCT_2	ECOD (v295)
F [auth E]	CoV_NSP10	e8tg9E1	A: alpha arrays	X: HTH	H: HTH	T: Three-helical HTH	F: CoV_NSP10	ECOD (v295)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
E [auth L], G [auth F]	Light Chain	IGKV1	Kappa	atrial natriuretic peptide receptor 1	SAbDab (2026-06-26)
D [auth H], F [auth E]	Heavy Chain	IGHV1	-	atrial natriuretic peptide receptor 1	SAbDab (2026-06-26)

Thera-SAbDab Antibody Annotation Thera-SAbDab Database Homepage

Chain	Name	Target	Provenance Source
E [auth L], G [auth F]	Vixticibart	NPR1/ANPRA/ANPa/GUC2A/GUCY2A/NPRA	Therapeutic SAbDab (2026-06-26)
D [auth H], F [auth E]	Vixticibart	NPR1/ANPRA/ANPa/GUC2A/GUCY2A/NPRA	Therapeutic SAbDab (2026-06-26)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF01094	Receptor family ligand binding region (ANF_receptor)	Receptor family ligand binding region	This family includes extracellular ligand binding domains of a wide range of receptors. This family also includes the bacterial amino acid binding proteins of known structure.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	Atrial natriuretic peptide receptor 1	peptide receptor activity molecular transducer activity signaling receptor activity natriuretic peptide receptor activity binding guanyl nucleotide binding GTP binding nucleotide binding guanyl ribonucleotide binding purine ribonucleotide binding purine ribonucleoside triphosphate binding nucleoside phosphate binding ion binding purine nucleotide binding peptide receptor activity molecular transducer activity signaling receptor activity natriuretic peptide receptor activity binding guanyl nucleotide binding GTP binding nucleotide binding guanyl ribonucleotide binding purine ribonucleotide binding purine ribonucleoside triphosphate binding nucleoside phosphate binding ion binding purine nucleotide binding anion binding heterocyclic compound binding carbohydrate derivative binding ribonucleotide binding small molecule binding adenyl ribonucleotide binding adenyl nucleotide binding ATP binding catalytic activity, acting on a protein kinase activity protein kinase activity transferase activity catalytic activity phosphotransferase activity, alcohol group as acceptor transferase activity, transferring phosphorus-containing groups peptide hormone binding hormone binding G protein-coupled receptor activity G protein-coupled peptide receptor activity transmembrane signaling receptor activity phosphorus-oxygen lyase activity cyclase activity lyase activity guanylate cyclase activity	multicellular organismal process system process circulatory system process regulation of blood pressure biological regulation regulation of biological quality blood circulation regulation of body fluid levels renal system process positive regulation of urine volume regulation of urine volume regulation of biological process negative regulation of cell population proliferation cell population proliferation multicellular organismal process system process circulatory system process regulation of blood pressure biological regulation regulation of biological quality blood circulation regulation of body fluid levels renal system process positive regulation of urine volume regulation of urine volume regulation of biological process negative regulation of cell population proliferation cell population proliferation regulation of cellular process regulation of smooth muscle cell proliferation negative regulation of biological process smooth muscle cell proliferation negative regulation of smooth muscle cell proliferation regulation of cell population proliferation negative regulation of cellular process muscle cell proliferation cellular process regulation of vascular permeability vascular process in circulatory system regulation of growth regulation of cellular component organization growth negative regulation of cell growth regulation of cell growth cell growth cellular component organization negative regulation of growth cellular component organization or biogenesis amine metabolic process catecholamine metabolic process phenol-containing compound metabolic process dopamine metabolic process metabolic process catechol-containing compound metabolic process biogenic amine metabolic process body fluid secretion localization secretion transport establishment of localization cellular response to stimulus cell surface receptor signaling pathway response to stimulus signaling signal transduction cell communication regulation of localization renal sodium excretion inorganic ion homeostasis regulation of renal system process homeostatic process regulation of system process positive regulation of biological process positive regulation of secretion monoatomic ion homeostasis regulation of multicellular organismal process monoatomic cation homeostasis positive regulation of renal sodium excretion excretion sodium ion homeostasis regulation of transport renal tubular secretion regulation of secretion regulation of renal sodium excretion positive regulation of transport chemical homeostasis positive regulation of multicellular organismal process regulation of excretion ribose phosphate metabolic process nucleotide biosynthetic process carbohydrate derivative metabolic process purine ribonucleotide biosynthetic process cyclic nucleotide metabolic process nucleobase-containing compound metabolic process ribonucleotide biosynthetic process purine nucleotide metabolic process ribonucleotide metabolic process nucleobase-containing small molecule metabolic process purine-containing compound biosynthetic process cyclic nucleotide biosynthetic process small molecule metabolic process phosphorus metabolic process ribose phosphate biosynthetic process nucleoside phosphate metabolic process carbohydrate derivative biosynthetic process cyclic purine nucleotide metabolic process primary metabolic process nucleotide metabolic process nucleobase-containing compound biosynthetic process purine-containing compound metabolic process biosynthetic process cGMP metabolic process organophosphate metabolic process organophosphate biosynthetic process nucleoside phosphate biosynthetic process purine ribonucleotide metabolic process cGMP biosynthetic process purine nucleotide biosynthetic process regulation of developmental process angiogenesis regulation of vasculature development multicellular organism development tube morphogenesis anatomical structure development regulation of anatomical structure morphogenesis system development blood vessel development developmental process regulation of multicellular organismal development blood vessel morphogenesis tube development negative regulation of blood vessel morphogenesis negative regulation of developmental process negative regulation of angiogenesis vasculature development circulatory system development negative regulation of vasculature development anatomical structure morphogenesis regulation of angiogenesis anatomical structure formation involved in morphogenesis negative regulation of multicellular organismal process intracellular signal transduction regulation of tube diameter regulation of tube size blood vessel diameter maintenance regulation of anatomical structure size receptor guanylyl cyclase signaling pathway enzyme-linked receptor protein signaling pathway	membrane-bounded organelle intracellular anatomical structure nuclear membrane membrane nucleus intracellular membrane-bounded organelle endomembrane system intracellular organelle organelle envelope cellular anatomical structure organelle nuclear envelope organelle membrane cell periphery membrane-bounded organelle intracellular anatomical structure nuclear membrane membrane nucleus intracellular membrane-bounded organelle endomembrane system intracellular organelle organelle envelope cellular anatomical structure organelle nuclear envelope organelle membrane cell periphery plasma membrane organelle subcompartment endoplasmic reticulum subcompartment nuclear outer membrane-endoplasmic reticulum membrane network endoplasmic reticulum cytoplasm endoplasmic reticulum membrane protein-containing complex signaling receptor complex
E [auth L], G [auth F]	REGN5381 Fab light chain	-	-	-
D [auth H], F [auth E]	REGN5381 Fab heavy chain	-	-	-
C	Atrial natriuretic peptide	protein binding binding signaling receptor binding hormone receptor binding hormone activity molecular function activator activity molecular function regulator activity neuropeptide hormone activity neuropeptide activity signaling receptor regulator activity receptor ligand activity signaling receptor activator activity G protein-coupled receptor binding neuropeptide receptor binding	cellular response to stimulus regulation of biological process regulation of cellular process response to stimulus signaling biological regulation cell communication G protein-coupled receptor signaling pathway cellular process signal transduction neuropeptide signaling pathway heart process multicellular organismal process system process cellular response to stimulus regulation of biological process regulation of cellular process response to stimulus signaling biological regulation cell communication G protein-coupled receptor signaling pathway cellular process signal transduction neuropeptide signaling pathway heart process multicellular organismal process system process regulation of heart contraction regulation of system process positive regulation of biological process positive regulation of heart rate positive regulation of blood circulation positive regulation of heart contraction circulatory system process regulation of blood circulation positive regulation of multicellular organismal process regulation of multicellular organismal process regulation of biological quality heart contraction blood circulation regulation of heart rate regulation of blood pressure regulation of catalytic activity negative regulation of biological process negative regulation of catalytic activity regulation of signal transduction regulation of transferase activity regulation of MAP kinase activity intracellular signal transduction regulation of primary metabolic process negative regulation of kinase activity negative regulation of JNK cascade JNK cascade phosphate-containing compound metabolic process intracellular signaling cassette negative regulation of protein modification process protein modification process negative regulation of protein metabolic process protein phosphorylation phosphorylation regulation of protein metabolic process negative regulation of metabolic process regulation of JNK cascade primary metabolic process regulation of MAPK cascade regulation of molecular function regulation of kinase activity regulation of response to stimulus negative regulation of protein phosphorylation regulation of protein serine/threonine kinase activity macromolecule modification metabolic process macromolecule metabolic process regulation of metabolic process regulation of protein modification process regulation of protein phosphorylation negative regulation of signaling negative regulation of intracellular signal transduction negative regulation of phosphate metabolic process negative regulation of cell communication regulation of intracellular signal transduction negative regulation of protein serine/threonine kinase activity negative regulation of cellular process protein metabolic process negative regulation of JUN kinase activity negative regulation of macromolecule metabolic process regulation of signaling negative regulation of response to stimulus negative regulation of molecular function negative regulation of MAP kinase activity regulation of protein kinase activity regulation of macromolecule metabolic process negative regulation of protein kinase activity negative regulation of signal transduction regulation of JUN kinase activity MAPK cascade regulation of cell communication regulation of phosphorylation negative regulation of phosphorylation negative regulation of MAPK cascade multi-multicellular organism process reproductive process female pregnancy multi-organism reproductive process protein folding biosynthetic process gene expression macromolecule biosynthetic process protein maturation homeostatic process response to oxygen-containing compound cellular response to glucose stimulus intracellular glucose homeostasis cellular response to oxygen-containing compound response to hexose cellular response to carbohydrate stimulus cellular response to chemical stimulus cellular homeostasis response to monosaccharide response to carbohydrate chemical homeostasis response to glucose response to chemical glucose homeostasis carbohydrate homeostasis cellular response to hexose stimulus intracellular chemical homeostasis cellular response to monosaccharide stimulus regulation of growth regulation of cellular component organization growth negative regulation of cell growth regulation of cell growth cell growth cellular component organization negative regulation of growth cellular component organization or biogenesis regulation of tube diameter regulation of tube size vascular process in circulatory system blood vessel diameter maintenance vasodilation regulation of anatomical structure size developmental process heart development heart valve development animal organ development aortic valve development circulatory system development multicellular organism development anatomical structure morphogenesis heart valve morphogenesis anatomical structure development semi-lunar valve development aortic valve morphogenesis system development cellular response to oxidative stress cellular response to chemical stress cellular response to hydrogen peroxide response to reactive oxygen species response to hydrogen peroxide response to oxidative stress cellular response to reactive oxygen species cellular response to stress response to stress synaptic signaling cell-cell signaling synaptic signaling via neuropeptide 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 regulation of membrane repolarization atrial cardiac muscle cell membrane repolarization regulation of cardiac muscle cell membrane repolarization regulation of atrial cardiac muscle cell membrane repolarization regulation of membrane potential cardiac conduction system development cardiac muscle tissue development tissue development striated muscle tissue development muscle tissue development lymphatic vascular process in circulatory system collecting lymphatic vessel constriction negative regulation of collecting lymphatic vessel constriction regulation of collecting lymphatic vessel constriction regulation of lymphatic vessel size negative regulation of multicellular organismal process response to hormone response to endogenous stimulus response to peptide hormone response to insulin response to nitrogen compound response to decreased oxygen levels response to hypoxia response to oxygen levels cellular developmental process cardiac muscle cell development developmental growth cell development organ growth muscle cell differentiation muscle structure development striated muscle cell development muscle cell development cell differentiation cardiac muscle hypertrophy cardiac cell development cardiac muscle tissue growth muscle hypertrophy heart growth developmental cell growth physiological muscle hypertrophy cardiac muscle cell differentiation striated muscle hypertrophy muscle system process cardiocyte differentiation cell growth involved in cardiac muscle cell development physiological cardiac muscle hypertrophy striated muscle cell differentiation regulation of systemic arterial blood pressure negative regulation of systemic arterial blood pressure negative regulation of blood pressure ribose phosphate metabolic process nucleotide biosynthetic process carbohydrate derivative metabolic process purine ribonucleotide biosynthetic process cyclic nucleotide metabolic process nucleobase-containing compound metabolic process ribonucleotide biosynthetic process purine nucleotide metabolic process ribonucleotide metabolic process nucleobase-containing small molecule metabolic process purine-containing compound biosynthetic process cyclic nucleotide biosynthetic process small molecule metabolic process phosphorus metabolic process ribose phosphate biosynthetic process nucleoside phosphate metabolic process carbohydrate derivative biosynthetic process cyclic purine nucleotide metabolic process nucleotide metabolic process nucleobase-containing compound biosynthetic process purine-containing compound metabolic process cGMP metabolic process organophosphate metabolic process organophosphate biosynthetic process nucleoside phosphate biosynthetic process purine ribonucleotide metabolic process cGMP biosynthetic process purine nucleotide biosynthetic process regulation of calcium ion transport regulation of localization transport monoatomic ion transmembrane transport regulation of monoatomic ion transmembrane transport calcium ion transport metal ion transport regulation of calcium ion transmembrane transport monoatomic cation transmembrane transport localization regulation of calcium ion transmembrane transport via high voltage-gated calcium channel monoatomic ion transport calcium ion transmembrane transport via high voltage-gated calcium channel monoatomic cation transport regulation of metal ion transport regulation of transport regulation of monoatomic ion transport establishment of localization transmembrane transport regulation of transmembrane transport regulation of monoatomic cation transmembrane transport calcium ion transmembrane transport response to polycyclic arene response to 3-methylcholanthrene cell surface receptor signaling pathway receptor guanylyl cyclase signaling pathway enzyme-linked receptor protein signaling pathway positive regulation of cation transmembrane transport regulation of potassium ion transport potassium ion transmembrane transport export across plasma membrane potassium ion export across plasma membrane positive regulation of monoatomic ion transport positive regulation of potassium ion export across plasma membrane positive regulation of transmembrane transport positive regulation of monoatomic ion transmembrane transport positive regulation of cellular process export from cell regulation of potassium ion transmembrane transport positive regulation of potassium ion transport positive regulation of transport regulation of potassium ion export across plasma membrane positive regulation of potassium ion transmembrane transport potassium ion transport cellular response to nitrogen compound response to angiotensin cellular response to peptide hormone stimulus cellular response to angiotensin cellular response to endogenous stimulus cellular response to hormone stimulus positive regulation of cardiac muscle contraction cardiac muscle contraction striated muscle contraction positive regulation of striated muscle contraction regulation of cardiac muscle contraction muscle contraction regulation of muscle system process regulation of striated muscle contraction regulation of muscle contraction positive regulation of muscle contraction response to muscle stretch	somatodendritic compartment cell body cellular anatomical structure perikaryon neuronal cell body synapse cell junction glycinergic synapse apical part of cell cluster of actin-based cell projections brush border membrane-bounded organelle intracellular anatomical structure lytic vacuole somatodendritic compartment cell body cellular anatomical structure perikaryon neuronal cell body synapse cell junction glycinergic synapse apical part of cell cluster of actin-based cell projections brush border membrane-bounded organelle intracellular anatomical structure lytic vacuole vacuole intracellular membrane-bounded organelle intracellular organelle mast cell granule organelle cytoplasm lysosome protein-containing complex extracellular region perinuclear region of cytoplasm cell projection

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR001054	Adenylyl cyclase class-3/4/guanylyl cyclase	Domain
A, B	IPR050401	Cyclic nucleotide synthase	Family
A, B	IPR000719	Protein kinase domain	Domain
A, B	IPR001245	Serine-threonine/tyrosine-protein kinase, catalytic domain	Domain
A, B	IPR029787	Nucleotide cyclase	Homologous Superfamily
A, B	IPR018297	Adenylyl cyclase class-4/guanylyl cyclase, conserved site	Conserved Site
A, B	IPR028082	Periplasmic binding protein-like I	Homologous Superfamily
A, B	IPR011009	Protein kinase-like domain superfamily	Homologous Superfamily
A, B	IPR001170	Adenylyl cyclase class-4/guanylyl cyclase	Family
A, B	IPR001828	Receptor, ligand binding region	Domain
C	IPR030480	Natriuretic peptide, conserved site	Conserved Site
C	IPR050787	Natriuretic Peptide Hormone	Family
C	IPR002407	Natriuretic peptide, atrial type	Family
C	IPR000663	Natriuretic peptide	Family

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A, B	: P16066	Fibrosis kidney disease congestive heart failure hypertensive disorder lung adenocarcinoma malignant glioma osteosarcoma psoriasis breast fibroadenoma lung cancer alcohol-related disorders ductal breast carcinoma in situ lung carcinoma non-small cell lung carcinoma Sjogren syndrome Fibrosis kidney disease congestive heart failure hypertensive disorder lung adenocarcinoma malignant glioma osteosarcoma psoriasis breast fibroadenoma lung cancer alcohol-related disorders ductal breast carcinoma in situ lung carcinoma non-small cell lung carcinoma Sjogren syndrome breast carcinoma heart failure invasive ductal breast carcinoma
C	: P01160	atrial fibrillation, familial, 6 dilated cardiomyopathy congestive heart failure melanoma familial atrial fibrillation aortic valve insufficiency hypertensive disorder coronary stenosis patent ductus arteriosus renal hypertension atrial standstill 2 Urination Disorders granular cell carcinoma skin cancer cirrhosis of liver atrial fibrillation, familial, 6 dilated cardiomyopathy congestive heart failure melanoma familial atrial fibrillation aortic valve insufficiency hypertensive disorder coronary stenosis patent ductus arteriosus renal hypertension atrial standstill 2 Urination Disorders granular cell carcinoma skin cancer cirrhosis of liver adenocarcinoma prostate cancer skin neoplasm atrial standstill ureteral obstruction cardiomyopathy myocardial infarction tubular adenocarcinoma lung benign neoplasm malignant ependymoma cribriform carcinoma myocardial ischemia heart failure psoriasis hypotensive disorder small cell lung carcinoma atypical teratoid rhabdoid tumor type 2 diabetes mellitus coronary artery disease cribriform carcinoma of breast acute kidney failure atrial fibrillation congenital diaphragmatic hernia medulloblastoma cutaneous melanoma ovarian cancer dilated cardiomyopathy 1A glioblastoma heart disease atrial fibrillation, familial, 1 small cell carcinoma large cell medulloblastoma

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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.