Annotations: 8QOT

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	G protein-coupled receptor-like	8091218	3000473	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)
C [auth H]	DNA_topoisoIV	e8qotH01	A: a/b three-layered sandwiches	X: ATP-grasp_6	H: ATP-grasp_6	T: ATP-grasp_6	F: DNA_topoisoIV	ECOD (v294.1)
B	DNA_topoisoIV	e8qotB01	A: a/b three-layered sandwiches	X: ATP-grasp_6	H: ATP-grasp_6	T: ATP-grasp_6	F: DNA_topoisoIV	ECOD (v294.1)
A	DNA_topoisoIV	e8qotA01	A: a/b three-layered sandwiches	X: ATP-grasp_6	H: ATP-grasp_6	T: ATP-grasp_6	F: DNA_topoisoIV	ECOD (v294.1)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
E [auth K]	Heavy Chain	IGHV1	-	-	SAbDab (2026-03-27)
D [auth L]	Light Chain	IGKV1	Kappa	mu-type opioid receptor	SAbDab (2026-03-27)
C [auth H]	Heavy Chain	IGHV3	-	mu-type opioid receptor	SAbDab (2026-03-27)
B	Heavy Chain	IGHV1	-	mu-type opioid receptor	SAbDab (2026-03-27)

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
E [auth K]	Anti-Fab Nanobody	-	-	-
D [auth L]	NabFab LC	-	-	-
C [auth H]	NabFab HC	-	-	-
B	Nanobody E (NbE)	-	-	-
A	Mu-type opioid receptor	binding neuropeptide binding peptide binding protein binding G-protein alpha-subunit binding peptide receptor activity molecular transducer activity beta-endorphin receptor activity G protein-coupled opioid receptor activity G protein-coupled receptor activity transmembrane signaling receptor activity signaling receptor activity G protein-coupled peptide receptor activity melanocortin receptor activity binding neuropeptide binding peptide binding protein binding G-protein alpha-subunit binding peptide receptor activity molecular transducer activity beta-endorphin receptor activity G protein-coupled opioid receptor activity G protein-coupled receptor activity transmembrane signaling receptor activity signaling receptor activity G protein-coupled peptide receptor activity melanocortin receptor activity neuropeptide receptor activity morphine receptor activity protein domain specific binding calcium channel activity monoatomic cation transmembrane transporter activity voltage-gated calcium channel activity gated channel activity monoatomic ion channel activity voltage-gated channel activity voltage-gated monoatomic ion channel activity voltage-gated monoatomic cation channel activity monoatomic cation channel activity passive transmembrane transporter activity calcium ion transmembrane transporter activity channel activity monoatomic ion transmembrane transporter activity transporter activity metal ion transmembrane transporter activity transmembrane transporter activity G-protein beta-subunit binding	trans-synaptic signaling regulation of biological process regulation of signaling regulation of cellular process modulation of chemical synaptic transmission signaling biological regulation cell-cell signaling presynaptic modulation of chemical synaptic transmission chemical synaptic transmission cell communication synaptic signaling regulation of trans-synaptic signaling anterograde trans-synaptic signaling trans-synaptic signaling regulation of biological process regulation of signaling regulation of cellular process modulation of chemical synaptic transmission signaling biological regulation cell-cell signaling presynaptic modulation of chemical synaptic transmission chemical synaptic transmission cell communication synaptic signaling regulation of trans-synaptic signaling anterograde trans-synaptic signaling regulation of cell communication cellular process cellular response to stimulus response to stimulus G protein-coupled opioid receptor signaling pathway G protein-coupled receptor signaling pathway signal transduction multi-multicellular organism process multicellular organismal process sperm ejaculation reproductive process multicellular organismal reproductive process mating behavior behavior reproductive behavior insemination multi-organism reproductive process copulation system process nervous system process transmission of nerve impulse phospholipase C-activating G protein-coupled receptor signaling pathway regulation of biological quality negative regulation of cytosolic calcium ion concentration negative regulation of signaling negative regulation of biological process regulation of signal transduction negative regulation of G protein-coupled receptor signaling pathway negative regulation of cell communication negative regulation of cellular process regulation of G protein-coupled receptor signaling pathway negative regulation of response to stimulus adenylate cyclase-activating G protein-coupled receptor signaling pathway negative regulation of signal transduction negative regulation of adenylate cyclase-activating G protein-coupled receptor signaling pathway regulation of response to stimulus adenylate cyclase-modulating G protein-coupled receptor signaling pathway regulation of adenylate cyclase-activating G protein-coupled receptor signaling pathway positive regulation of nervous system development regulation of developmental process cellular developmental process positive regulation of biological process cell development regulation of cell differentiation regulation of neurogenesis regulation of cell development regulation of nervous system development positive regulation of developmental process multicellular organism development neurogenesis positive regulation of cell differentiation cell differentiation anatomical structure development positive regulation of neurogenesis regulation of multicellular organismal process positive regulation of cellular process system development developmental process regulation of multicellular organismal development positive regulation of cell development nervous system development positive regulation of multicellular organismal process cellular response to nitrogen compound response to dopamine cellular response to dopamine response to monoamine response to catecholamine adenylate cyclase-activating dopamine receptor signaling pathway cellular response to catecholamine stimulus G protein-coupled dopamine receptor signaling pathway response to oxygen-containing compound response to nitrogen compound cellular response to oxygen-containing compound cellular response to chemical stimulus cellular response to monoamine stimulus response to chemical neuropeptide signaling pathway monosaccharide metabolic process gluconeogenesis regulation of primary metabolic process positive regulation of metabolic process regulation of small molecule metabolic process positive regulation of biosynthetic process small molecule metabolic process regulation of carbohydrate metabolic process regulation of glucose metabolic process positive regulation of gluconeogenesis regulation of biosynthetic process carbohydrate metabolic process small molecule biosynthetic process carbohydrate biosynthetic process hexose metabolic process primary metabolic process monosaccharide biosynthetic process hexose biosynthetic process positive regulation of glucose metabolic process biosynthetic process regulation of gluconeogenesis metabolic process positive regulation of carbohydrate metabolic process regulation of carbohydrate biosynthetic process positive regulation of small molecule metabolic process regulation of metabolic process glucose metabolic process locomotory behavior cellular response to acetylcholine acetylcholine receptor signaling pathway postsynaptic signal transduction adenylate cyclase-inhibiting G protein-coupled receptor signaling pathway G protein-coupled acetylcholine receptor signaling pathway response to acetylcholine adenylate cyclase-inhibiting G protein-coupled acetylcholine receptor signaling pathway positive regulation of cell communication positive 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 positive regulation of MAPK cascade positive regulation of intracellular signal transduction regulation of MAPK cascade MAPK cascade ERK1 and ERK2 cascade regulation of ERK1 and ERK2 cascade positive regulation of signaling regulation of localization transport regulation of signaling receptor activity regulation of transmembrane transporter activity localization regulation of NMDA receptor activity regulation of transport establishment of localization transmembrane transport regulation of molecular function regulation of transmembrane transport regulation of neurotransmitter receptor activity negative regulation of luteinizing hormone secretion regulation of system 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 hormone secretion secretion by cell regulation of secretion by cell signal release secretion regulation of gonadotropin secretion export from cell endocrine process hormone transport eating behavior feeding behavior regulation of cellular response to stress cellular response to stress regulation of response to stress response to stress adenylate cyclase-inhibiting opioid receptor signaling pathway regulation of nitric oxide biosynthetic process negative regulation of metabolic process reactive nitrogen species metabolic process nitric oxide metabolic process nitric oxide biosynthetic process negative regulation of nitric oxide biosynthetic process negative regulation of biosynthetic process regulation of nitric oxide metabolic process response to nutrient levels regulation of response to nutrient levels positive regulation of appetite regulation of response to food response to food positive regulation of response to food regulation of appetite positive regulation of response to nutrient levels adult behavior response to alcohol behavioral response to ethanol response to ethanol regulation of postsynaptic membrane potential chemical synaptic transmission, postsynaptic cell surface receptor signaling pathway excitatory postsynaptic potential regulation of membrane potential biological process involved in intraspecies interaction between organisms social behavior sensory perception sensory perception of pain negative regulation of protein transport establishment of protein localization regulation of protein localization negative regulation of Wnt protein secretion protein localization to extracellular region intracellular protein localization regulation of Wnt protein secretion negative regulation of protein localization establishment of protein localization to extracellular region regulation of establishment of protein localization negative regulation of establishment of protein localization regulation of protein transport Wnt protein secretion protein secretion regulation of protein secretion negative regulation of protein secretion protein transport macromolecule localization	cell periphery postsynapse cellular anatomical structure postsynaptic membrane synapse cell junction membrane plasma membrane plasma membrane region synaptic membrane sarcolemma T-tubule somatodendritic compartment cell body cell periphery postsynapse cellular anatomical structure postsynaptic membrane synapse cell junction membrane plasma membrane plasma membrane region synaptic membrane sarcolemma T-tubule somatodendritic compartment cell body perikaryon neuronal cell body presynapse presynaptic membrane cell projection dendrite dendritic tree neuron projection plasma membrane bounded cell projection membrane-bounded organelle intracellular anatomical structure intracellular membrane-bounded organelle endomembrane system sarcoplasm intracellular organelle organelle endoplasmic reticulum sarcoplasmic reticulum cytoplasm axon mitochondrion anchoring junction focal adhesion cell-substrate junction GABA-ergic synapse neuron projection cytoplasm dendrite cytoplasm cell leading edge leading edge membrane neuron projection membrane dendrite membrane cell projection membrane endosome intracellular vesicle cytoplasmic vesicle vesicle neuron spine dendritic spine spine apparatus

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR001418	Opioid receptor	Family
A	IPR000276	G protein-coupled receptor, rhodopsin-like	Family
A	IPR017452	GPCR, rhodopsin-like, 7TM	Domain
A	IPR000105	Mu opioid receptor	Family

Membrane Protein Annotation: PDBTM PDBTM Database Homepage

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

Membrane Protein Annotation: MemProtMD MemProtMD Database Homepage

Chains	External Link	Comment
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. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.