7UL3 | pdb_00007ul3

CryoEM Structure of Inactive H2R Bound to Famotidine, Nb6M, and NabFab

External Resource: Annotation

Domain Annotation: ECOD Classification
Domain Annotation: CATH
SAbDab Antibody Annotation
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Pharos: Disease Associations
Membrane Protein Annotation: OPM
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)
A	7tm_1_3	e7ul3A1	A: alpha bundles	X: Family A G protein-coupled receptor-like (From Topology)	H: Family A G protein-coupled receptor-like (From Topology)	T: Family A G protein-coupled receptor-like	F: 7tm_1_3	ECOD (1.6)
B [auth C]	V-set_12	e7ul3C1	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: V-set_12	ECOD (1.6)
C [auth H]	C1-set_1	e7ul3H1	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: C1-set_1	ECOD (1.6)
C [auth H]	V-set_12	e7ul3H2	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: V-set_12	ECOD (1.6)
D [auth L]	C1-set_4	e7ul3L1	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: C1-set_4	ECOD (1.6)
D [auth L]	V-set	e7ul3L2	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: V-set	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
B [auth C]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
C [auth H]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
D [auth L]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
B [auth C]	Heavy Chain	IGHV1	-	histamine h2 receptor	SAbDab (2025-09-26)
C [auth H]	Heavy Chain	IGHV3	-	-	SAbDab (2025-09-26)
D [auth L]	Light Chain	IGKV1	Kappa	-	SAbDab (2025-09-26)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
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	Histamine H2 receptor	neurotransmitter receptor activity molecular transducer activity signaling receptor activity G protein-coupled amine receptor activity G protein-coupled receptor activity transmembrane signaling receptor activity histamine receptor activity binding neuropeptide binding peptide binding peptide receptor activity G protein-coupled opioid receptor activity G protein-coupled peptide receptor activity dynorphin receptor activity neurotransmitter receptor activity molecular transducer activity signaling receptor activity G protein-coupled amine receptor activity G protein-coupled receptor activity transmembrane signaling receptor activity histamine receptor activity binding neuropeptide binding peptide binding peptide receptor activity G protein-coupled opioid receptor activity G protein-coupled peptide receptor activity dynorphin receptor activity protein binding receptor serine/threonine kinase binding signaling receptor binding	localization multicellular organismal process system process digestion secretion transport digestive system process acid secretion gastric acid secretion establishment of localization regulation of tube diameter regulation of biological process regulation of tube size regulation of system process localization multicellular organismal process system process digestion secretion transport digestive system process acid secretion gastric acid secretion establishment of localization regulation of tube diameter regulation of biological process regulation of tube size regulation of system process biological regulation positive regulation of biological 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 regulation of biological quality vasoconstriction blood circulation regulation of anatomical structure size response to stimulus immune response immune system process trans-synaptic signaling synaptic signaling signaling anterograde trans-synaptic signaling cell-cell signaling cellular process chemical synaptic transmission cell communication cellular response to stimulus regulation of cellular process G protein-coupled receptor signaling pathway, coupled to cyclic nucleotide second messenger G protein-coupled receptor signaling pathway signal transduction ovulation cycle rhythmic process estrous cycle reproductive process multicellular organismal reproductive process G protein-coupled opioid receptor signaling pathway sensory perception nervous system process phospholipase C-activating G protein-coupled receptor signaling pathway behavior learning learning or memory cognition conditioned place preference associative learning biological process involved in interspecies interaction between organisms defense response to virus defense response response to other organism response to stress response to external stimulus response to external biotic stimulus response to virus response to biotic stimulus response to acrylamide response to chemical response to oxygen-containing compound response to nitrogen compound neuropeptide signaling pathway locomotory behavior adult behavior behavioral response to cocaine response to cocaine response to alkaloid response to hormone response to endogenous stimulus response to estrogen homeostatic process 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 glucose homeostasis carbohydrate homeostasis cellular response to hexose stimulus intracellular chemical homeostasis cellular response to monosaccharide stimulus maternal behavior parental behavior reproductive behavior regulation of localization negative regulation of luteinizing hormone secretion negative regulation of biological process negative regulation of transport negative regulation of secretion regulation of luteinizing hormone secretion luteinizing hormone secretion negative regulation of hormone secretion negative regulation of secretion by cell regulation of hormone levels regulation of secretion endocrine hormone secretion negative regulation of gonadotropin secretion negative regulation of multicellular organismal process regulation of endocrine process regulation of hormone secretion gonadotropin secretion negative regulation of signaling hormone secretion negative regulation of cell communication secretion by cell regulation of secretion by cell signal release negative regulation of cellular process regulation of signaling regulation of transport regulation of gonadotropin secretion export from cell endocrine process hormone transport regulation of cell communication eating behavior feeding behavior sensory perception of temperature stimulus response to lipid cellular response to lipopolysaccharide cellular response to molecule of bacterial origin response to lipopolysaccharide cellular response to biotic stimulus response to bacterium cellular response to lipid response to molecule of bacterial origin adenylate cyclase-inhibiting G protein-coupled receptor signaling pathway adenylate cyclase-inhibiting opioid receptor signaling pathway adenylate cyclase-modulating G protein-coupled receptor signaling pathway monoamine transport nitrogen compound transport regulation of catecholamine secretion organic hydroxy compound transport positive regulation of secretion by cell dopamine transport positive regulation of amine transport catecholamine transport positive regulation of secretion positive regulation of cellular process positive regulation of catecholamine secretion dopamine secretion positive regulation of dopamine secretion catecholamine secretion amine transport positive regulation of transport regulation of amine transport regulation of dopamine secretion regulation of body fluid levels secretion by tissue regulation of digestive system process body fluid secretion saliva secretion regulation of saliva secretion response to alcohol response to ethanol response to peptide hormone response to insulin positive regulation of cell communication positive regulation of signal transduction regulation of signal transduction p38MAPK cascade intracellular signal transduction positive regulation of response to stimulus regulation of intracellular signal transduction intracellular signaling cassette positive regulation of MAPK cascade positive regulation of intracellular signal transduction regulation of MAPK cascade positive regulation of p38MAPK cascade regulation of response to stimulus regulation of p38MAPK cascade MAPK cascade positive regulation of signaling regulation of eating behavior positive regulation of feeding behavior positive regulation of eating behavior regulation of behavior positive regulation of behavior regulation of feeding behavior sensory perception of pain response to nicotine positive regulation of cation transmembrane transport regulation of potassium ion transport monoatomic ion transmembrane transport potassium ion transmembrane transport regulation of monoatomic ion transmembrane transport metal ion transport monoatomic cation transmembrane transport positive regulation of monoatomic ion transport positive regulation of transmembrane transport monoatomic ion transport positive regulation of monoatomic ion transmembrane transport monoatomic cation transport regulation of metal ion transport regulation of monoatomic ion transport inorganic ion transmembrane transport regulation of potassium ion transmembrane transport inorganic cation transmembrane transport transmembrane transport positive regulation of potassium ion transport regulation of transmembrane transport positive regulation of potassium ion transmembrane transport regulation of monoatomic cation transmembrane transport potassium ion transport	cellular anatomical structure synapse cell junction cell periphery plasma membrane membrane somatodendritic compartment cell projection dendrite dendritic tree neuron projection plasma membrane bounded cell projection postsynapse postsynaptic membrane cellular anatomical structure synapse cell junction cell periphery plasma membrane membrane somatodendritic compartment cell projection dendrite dendritic tree neuron projection plasma membrane bounded cell projection postsynapse postsynaptic membrane plasma membrane region synaptic membrane sarcolemma T-tubule cell body perikaryon neuronal cell body intracellular anatomical structure cytoplasm cytosol presynapse presynaptic membrane membrane-bounded organelle intracellular membrane-bounded organelle endomembrane system sarcoplasm intracellular organelle organelle endoplasmic reticulum sarcoplasmic reticulum intracellular vesicle transport vesicle membrane bounding membrane of organelle cytoplasmic vesicle vesicle membrane synaptic vesicle synaptic vesicle membrane vesicle transport vesicle exocytic vesicle membrane cytoplasmic vesicle membrane secretory vesicle organelle membrane exocytic vesicle mitochondrion nucleus membrane-enclosed lumen intracellular organelle lumen nucleoplasm organelle lumen nuclear lumen axon axon terminus distal axon neuron projection terminus
B [auth C]	Nanobody 6M	-	-	-
C [auth H]	NabFab HC	-	-	-
D [auth L]	NabFab LC	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR000503	Histamine H2 receptor	Family
A	IPR000276	G protein-coupled receptor, rhodopsin-like	Family
A	IPR017452	GPCR, rhodopsin-like, 7TM	Domain
A	IPR001418	Opioid receptor	Family
A	IPR000276	G protein-coupled receptor, rhodopsin-like	Family
A	IPR000452	Kappa opioid receptor	Family
A	IPR017452	GPCR, rhodopsin-like, 7TM	Domain

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A	Pharos: P41145	transitional cell carcinoma Neoplasms, Experimental substance withdrawal syndrome Zollinger-Ellison syndrome duodenal ulcer gastroesophageal reflux disease coronary stenosis psoriasis drug-induced liver injury gastric ulcer peptic esophagitis schizophrenia systemic mastocytosis peptic ulcer disease Pain transitional cell carcinoma Neoplasms, Experimental substance withdrawal syndrome Zollinger-Ellison syndrome duodenal ulcer gastroesophageal reflux disease coronary stenosis psoriasis drug-induced liver injury gastric ulcer peptic esophagitis schizophrenia systemic mastocytosis peptic ulcer disease Pain opiate dependence cocaine dependence substance withdrawal syndrome visual epilepsy cocaine abuse pilocytic astrocytoma depressive disorder medulloblastoma obesity disorder pain agnosia schizophrenia glioblastoma malignant ependymoma atypical teratoid rhabdoid tumor large cell medulloblastoma malignant glioma astrocytic tumor oligodendroglioma

Membrane Protein Annotation: OPM OPM Database Homepage

Chains	External Link	Type	Class	Superfamily	Family
A	OPM	Transmembrane	Alpha-helical polytopic	Rhodopsin-like receptors and pumps	G-protein coupled receptors, family A

Membrane Protein Annotation: PDBTM PDBTM Database Homepage

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

Membrane Protein Annotation: mpstruc mpstruc Database Homepage

Chains	Resource Link	Group	Subgroup	Protein
A	mpstruc	TRANSMEMBRANE PROTEINS: ALPHA-HELICAL	G Protein-Coupled Receptors: Class A	Histamine H₂ receptor, complexed with famotidine, a modified nanobody Nb6M, and nanobody-binding antibody fragment (NabFab)

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.