Annotations: 8HN1

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A [auth C]	SCOP2B Superfamily	Snake toxin-like	8059559	3000545	SCOP2B (2022-06-29)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
C [auth D]	Heavy Chain	IGHV1	-	alpha-1a adrenergic receptor	SAbDab (2025-11-28)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A [auth C]	PF21947	Snake toxin cobra-type (Toxin_cobra-type)	Snake toxin cobra-type	-	Family
B [auth A]	PF00001	7 transmembrane receptor (rhodopsin family) (7tm_1)	7 transmembrane receptor (rhodopsin family)	This family contains, amongst other G-protein-coupled receptors (GCPRs), members of the opsin family, which have been considered to be typical members of the rhodopsin superfamily. They share several motifs, mainly the seven transmembrane helices, GC ...	This family contains, amongst other G-protein-coupled receptors (GCPRs), members of the opsin family, which have been considered to be typical members of the rhodopsin superfamily. They share several motifs, mainly the seven transmembrane helices, GCPRs of the rhodopsin superfamily. All opsins bind a chromophore, such as 11-cis-retinal. The function of most opsins other than the photoisomerases is split into two steps: light absorption and G-protein activation. Photoisomerases, on the other hand, are not coupled to G-proteins - they are thought to generate and supply the chromophore that is used by visual opsins [1].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A [auth C]	Toxin AdTx1	toxin activity	-	cellular anatomical structure extracellular region
C [auth D]	Nb6	-	-	-
B [auth A]	Alpha-1A adrenergic receptor	protein heterodimerization activity protein binding binding protein dimerization activity alpha1-adrenergic receptor activity alpha-adrenergic receptor activity G protein-coupled amine receptor activity molecular transducer activity G protein-coupled receptor activity transmembrane signaling receptor activity signaling receptor activity adrenergic receptor activity	response to stimulus response to chemical response to xenobiotic stimulus positive regulation of cytosolic calcium ion concentration biological regulation regulation of biological quality regulation of biological process signaling cell-cell signaling neuron-glial cell signaling cellular process cell communication cellular response to stimulus positive regulation of cell communication response to stimulus response to chemical response to xenobiotic stimulus positive regulation of cytosolic calcium ion concentration biological regulation regulation of biological quality regulation of biological process signaling cell-cell signaling neuron-glial cell signaling cellular process cell communication cellular response to stimulus positive regulation of cell communication regulation of cellular process positive regulation of signal transduction positive regulation of biological process regulation of signal transduction intracellular signal transduction positive regulation of response to stimulus positive regulation of ERK1 and ERK2 cascade regulation of intracellular signal transduction intracellular signaling cassette signal transduction positive regulation of cellular process regulation of signaling positive regulation of MAPK cascade positive regulation of intracellular signal transduction regulation of MAPK cascade regulation of response to stimulus MAPK cascade regulation of cell communication ERK1 and ERK2 cascade regulation of ERK1 and ERK2 cascade positive regulation of signaling regulation of tube diameter multicellular organismal process system process regulation of tube size regulation of system process positive regulation of vasoconstriction circulatory system process regulation of blood circulation vascular process in circulatory system regulation of vasoconstriction positive regulation of multicellular organismal process regulation of multicellular organismal process blood vessel diameter maintenance vasoconstriction blood circulation regulation of anatomical structure size heart process negative regulation of heart rate regulation of systemic arterial blood pressure by carotid sinus baroreceptor feedback regulation of heart contraction negative regulation of biological process negative regulation of blood pressure negative regulation of systemic arterial blood pressure nervous system process involved in regulation of systemic arterial blood pressure regulation of heart rate nervous system process regulation of blood pressure regulation of systemic arterial blood pressure by baroreceptor feedback negative regulation of blood circulation negative regulation of heart rate involved in baroreceptor response to increased systemic arterial blood pressure baroreceptor response to increased systemic arterial blood pressure negative regulation of heart contraction regulation of systemic arterial blood pressure heart contraction negative regulation of multicellular organismal process phospholipase C-activating G protein-coupled receptor signaling pathway phospholipase C-activating adrenergic receptor signaling pathway adrenergic receptor signaling pathway G protein-coupled receptor signaling pathway regulation of systemic arterial blood pressure mediated by a chemical signal positive regulation of blood pressure positive regulation of blood circulation regulation of systemic arterial blood pressure by norepinephrine-epinephrine positive regulation of blood pressure by epinephrine-norepinephrine positive regulation of heart rate positive regulation of heart rate by epinephrine-norepinephrine positive regulation of heart contraction reflex pilomotor reflex response to external stimulus modulation of chemical synaptic transmission positive regulation of synaptic transmission, GABAergic synaptic signaling trans-synaptic signaling synaptic transmission, GABAergic positive regulation of synaptic transmission chemical synaptic transmission regulation of trans-synaptic signaling anterograde trans-synaptic signaling regulation of synaptic transmission, GABAergic smooth muscle contraction muscle contraction muscle system process apoptotic process cell death programmed cell death norepinephrine-epinephrine vasoconstriction involved in regulation of systemic arterial blood pressure regulation of action potential positive regulation of action potential action potential regulation of membrane potential adenylate cyclase-activating adrenergic receptor signaling pathway adenylate cyclase-activating G protein-coupled receptor signaling pathway adenylate cyclase-modulating G protein-coupled receptor signaling pathway negative regulation of cell population proliferation cell population proliferation regulation of cell population proliferation negative regulation of cellular process muscle hypertrophy regulation of muscle adaptation positive regulation of cardiac muscle hypertrophy striated muscle hypertrophy regulation of muscle system process regulation of cardiac muscle hypertrophy regulation of muscle hypertrophy muscle adaptation positive regulation of muscle hypertrophy cardiac muscle hypertrophy negative regulation of catabolic process catabolic process negative regulation of metabolic process autophagy regulation of catabolic process regulation of autophagy negative regulation of autophagy metabolic process process utilizing autophagic mechanism regulation of metabolic process positive regulation of smooth muscle contraction regulation of muscle contraction regulation of smooth muscle contraction positive regulation of muscle contraction cellular developmental process cardiac muscle cell development developmental growth cell development organ growth muscle cell differentiation cell growth striated muscle tissue development muscle structure development multicellular organism development striated muscle cell development muscle cell development cell differentiation anatomical structure development cardiac cell development muscle tissue development cardiac muscle tissue growth system development developmental process heart development heart growth developmental cell growth cardiac muscle tissue development physiological muscle hypertrophy growth animal organ development cardiac muscle cell differentiation tissue development cardiocyte differentiation circulatory system development cell growth involved in cardiac muscle cell development physiological cardiac muscle hypertrophy striated muscle cell differentiation regulation of the force of heart contraction by chemical signal regulation of the force of heart contraction positive regulation of the force of heart contraction by chemical signal positive regulation of the force of heart contraction by epinephrine-norepinephrine adult heart development response to hormone response to endogenous stimulus positive regulation of cardiac muscle contraction cardiac muscle contraction striated muscle contraction positive regulation of striated muscle contraction regulation of cardiac muscle contraction regulation of striated muscle contraction	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 cytoplasm 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 cytoplasm cytosol membrane microdomain cell periphery membrane raft plasma membrane raft plasma membrane plasma membrane region caveola membrane-enclosed lumen intracellular organelle lumen nucleoplasm organelle lumen nuclear lumen

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A [auth C]	IPR018354	Snake toxin, conserved site	Conserved Site
A [auth C]	IPR045860	Snake toxin-like superfamily	Homologous Superfamily
A [auth C]	IPR054131	Snake toxin cobra-type	Family
A [auth C]	IPR003571	Snake three-finger toxin	Family
B [auth A]	IPR000276	G protein-coupled receptor, rhodopsin-like	Family
B [auth A]	IPR002233	Adrenoceptor family	Family
B [auth A]	IPR017452	GPCR, rhodopsin-like, 7TM	Domain
B [auth A]	IPR001004	Alpha 1A adrenoceptor	Family

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
B [auth A]	Pharos: P35348	Diabetes Mellitus, Experimental cirrhosis of liver Parkinson disease peripheral vascular disease proctitis pulmonary emphysema allergic rhinitis seasonal allergic rhinitis anaphylaxis atopic conjunctivitis vasomotor rhinitis bronchiectasis cocaine abuse open-angle glaucoma common cold Diabetes Mellitus, Experimental cirrhosis of liver Parkinson disease peripheral vascular disease proctitis pulmonary emphysema allergic rhinitis seasonal allergic rhinitis anaphylaxis atopic conjunctivitis vasomotor rhinitis bronchiectasis cocaine abuse open-angle glaucoma common cold hemorrhoid rhinitis hypertensive disorder asthma benign prostatic hyperplasia bronchitis lung cancer cerebrovascular disorder cocaine dependence phaeochromocytoma essential hypertension psoriasis hepatocellular carcinoma schizophrenia alveolar capillary dysplasia with misalignment of pulmonary veins vascular disease bipolar disorder cannabis dependence major depressive disorder

Membrane Protein Annotation: PDBTM PDBTM Database Homepage

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

Membrane Protein Annotation: MemProtMD MemProtMD Database Homepage

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

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.