Annotations: 8J8R

Structure of beta-arrestin2 in complex with M2Rpp

External Resource: Annotation

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

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	DNA_topoisoIV	e8j8rA1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: DNA_topoisoIV	ECOD (v294.2)
B	DNA_topoisoIV	e8j8rB1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: DNA_topoisoIV	ECOD (v294.2)
C	DNA_topoisoIV	e8j8rC1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: DNA_topoisoIV	ECOD (v294.2)
D	DNA_topoisoIV	e8j8rD1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: DNA_topoisoIV	ECOD (v294.2)
G [auth H]	DNA_topoisoIV	e8j8rH1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: DNA_topoisoIV	ECOD (v294.2)
I [auth M]	DNA_topoisoIV	e8j8rM1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: DNA_topoisoIV	ECOD (v294.2)
E	DNA_topoisoIV	e8j8rE1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: DNA_topoisoIV	ECOD (v294.2)
H [auth L]	DNA_topoisoIV	e8j8rL1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: DNA_topoisoIV	ECOD (v294.2)
J [auth N]	DNA_topoisoIV	e8j8rN1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: DNA_topoisoIV	ECOD (v294.2)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
D, G [auth H], I [auth M]	Heavy Chain	IGHV3	-	beta-arrestin-2 \| muscarinic acetylcholine receptor m2	SAbDab (2026-06-12)
E, H [auth L], J [auth N]	Light Chain	IGKV1	Kappa	beta-arrestin-2 \| muscarinic acetylcholine receptor m2	SAbDab (2026-06-12)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B, C	PF00339	Arrestin (or S-antigen), N-terminal domain (Arrestin_N)	Arrestin (or S-antigen), N-terminal domain	Ig-like beta-sandwich fold. Scop reports duplication with C-terminal domain.	Domain
A, B, C	PF02752	Arrestin (or S-antigen), C-terminal domain (Arrestin_C)	Arrestin (or S-antigen), C-terminal domain	Ig-like beta-sandwich fold. Scop reports duplication with N-terminal domain.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B, C	Beta-arrestin-2	ion binding binding anion binding phosphatidylinositol binding small molecule binding phosphatidylinositol-3,4,5-trisphosphate binding phospholipid binding lipid binding phosphatidylinositol phosphate binding angiotensin receptor binding protein binding signaling receptor binding G protein-coupled receptor binding D1 dopamine receptor binding ion binding binding anion binding phosphatidylinositol binding small molecule binding phosphatidylinositol-3,4,5-trisphosphate binding phospholipid binding lipid binding phosphatidylinositol phosphate binding angiotensin receptor binding protein binding signaling receptor binding G protein-coupled receptor binding D1 dopamine receptor binding dopamine receptor binding inositol hexakisphosphate binding alcohol binding	cellular response to stimulus positive regulation of cell communication regulation of cellular process positive regulation of signal transduction response to stimulus signaling positive regulation of biological process regulation of signal transduction intracellular signal transduction cell communication positive regulation of response to stimulus positive regulation of ERK1 and ERK2 cascade regulation of intracellular signal transduction intracellular signaling cassette cellular response to stimulus positive regulation of cell communication regulation of cellular process positive regulation of signal transduction response to stimulus signaling positive regulation of biological process regulation of signal transduction intracellular signal transduction cell communication 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 biological process regulation of signaling positive regulation of MAPK cascade biological regulation positive regulation of intracellular signal transduction regulation of MAPK cascade regulation of response to stimulus MAPK cascade regulation of cell communication cellular process ERK1 and ERK2 cascade regulation of ERK1 and ERK2 cascade positive regulation of signaling localization import into cell receptor internalization transport receptor-mediated endocytosis endocytosis establishment of localization vesicle-mediated transport establishment of protein localization protein transport macromolecule localization intracellular protein localization regulation of localization regulation of cellular component organization positive regulation of cellular component organization regulation of receptor internalization cellular component organization positive regulation of endocytosis cellular component organization or biogenesis positive regulation of receptor-mediated endocytosis regulation of endocytosis regulation of transport regulation of receptor-mediated endocytosis regulation of vesicle-mediated transport positive regulation of receptor internalization positive regulation of transport negative adaptation of signaling pathway negative regulation of signaling negative regulation of biological process desensitization of G protein-coupled receptor signaling pathway 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 negative regulation of signal transduction adaptation of signaling pathway G protein-coupled receptor signaling pathway trans-synaptic signaling modulation of chemical synaptic transmission cell-cell signaling chemical synaptic transmission synaptic signaling regulation of trans-synaptic signaling anterograde trans-synaptic signaling multicellular organismal process system process sensory perception nervous system process sensory perception of pain G protein-coupled receptor internalization	cellular anatomical structure clathrin-coated pit membrane endomembrane system cell periphery plasma membrane membrane-bounded organelle intracellular anatomical structure intracellular vesicle intracellular membrane-bounded organelle intracellular organelle cytoplasmic vesicle organelle cytoplasm cellular anatomical structure clathrin-coated pit membrane endomembrane system cell periphery plasma membrane membrane-bounded organelle intracellular anatomical structure intracellular vesicle intracellular membrane-bounded organelle intracellular organelle cytoplasmic vesicle organelle cytoplasm vesicle endocytic vesicle nucleus
D, G [auth H], I [auth M]	Fab30 Heavy Chain	-	-	-
E, H [auth L], J [auth N]	Fab30 Light Chain	-	-	-
F [auth G], K [auth U], L [auth V]	Muscarinic acetylcholine receptor M2	protein binding binding arrestin family protein binding neurotransmitter receptor activity G protein-coupled amine receptor activity G protein-coupled acetylcholine receptor activity postsynaptic neurotransmitter receptor activity molecular transducer activity G protein-coupled receptor activity signaling receptor activity transmembrane signaling receptor activity G protein-coupled neurotransmitter receptor activity acetylcholine receptor activity	heart process multicellular organismal process system process regulation of biological process regulation of heart contraction regulation of system process biological regulation circulatory system process regulation of blood circulation regulation of multicellular organismal process heart contraction blood circulation cellular response to stimulus cellular response to nitrogen compound heart process multicellular organismal process system process regulation of biological process regulation of heart contraction regulation of system process biological regulation circulatory system process regulation of blood circulation regulation of multicellular organismal process heart contraction blood circulation cellular response to stimulus cellular response to nitrogen compound regulation of cellular process response to stimulus signaling cell communication synaptic signaling signal transduction cellular response to acetylcholine response to oxygen-containing compound cell-cell signaling response to nitrogen compound acetylcholine receptor signaling pathway postsynaptic signal transduction cellular response to oxygen-containing compound adenylate cyclase-inhibiting G protein-coupled receptor signaling pathway cellular response to chemical stimulus G protein-coupled acetylcholine receptor signaling pathway response to chemical adenylate cyclase-modulating G protein-coupled receptor signaling pathway response to acetylcholine G protein-coupled receptor signaling pathway cellular process adenylate cyclase-inhibiting G protein-coupled acetylcholine receptor signaling pathway trans-synaptic signaling regulation of signaling modulation of chemical synaptic transmission presynaptic modulation of chemical synaptic transmission chemical synaptic transmission regulation of trans-synaptic signaling anterograde trans-synaptic signaling regulation of cell communication phospholipase C-activating G protein-coupled receptor signaling pathway phospholipase C-activating G protein-coupled acetylcholine receptor signaling pathway muscle contraction muscle system process regulation of muscle system process smooth muscle contraction regulation of smooth muscle contraction regulation of muscle contraction developmental process multicellular organism development anatomical structure development nervous system development system development biological process involved in interspecies interaction between organisms response to other organism response to external stimulus response to external biotic stimulus response to virus response to biotic stimulus G protein-coupled receptor signaling pathway, coupled to cyclic nucleotide second messenger	cell periphery postsynapse cellular anatomical structure postsynaptic membrane synapse cell junction membrane plasma membrane plasma membrane region synaptic membrane membrane-bounded organelle intracellular anatomical structure intracellular vesicle intracellular organelle cell periphery postsynapse cellular anatomical structure postsynaptic membrane synapse cell junction membrane plasma membrane plasma membrane region synaptic membrane membrane-bounded organelle intracellular anatomical structure intracellular vesicle intracellular organelle bounding membrane of organelle cytoplasmic vesicle vesicle membrane clathrin-coated vesicle endocytic vesicle membrane coated vesicle vesicle endocytic vesicle clathrin-coated vesicle membrane clathrin-coated endocytic vesicle membrane intracellular membrane-bounded organelle clathrin-coated endocytic vesicle cytoplasmic vesicle membrane coated vesicle membrane organelle cytoplasm organelle membrane presynapse somatodendritic compartment cell projection dendrite dendritic tree neuron projection plasma membrane bounded cell projection cholinergic synapse

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B, C	IPR011022	Arrestin-like, C-terminal domain	Domain
A, B, C	IPR000698	Arrestin	Family
A, B, C	IPR011021	Arrestin-like, N-terminal	Domain
A, B, C	IPR014753	Arrestin, N-terminal	Homologous Superfamily
A, B, C	IPR014756	Immunoglobulin E-set	Homologous Superfamily
A, B, C	IPR017864	Arrestin, conserved site	Conserved Site
A, B, C	IPR014752	Arrestin-like, C-terminal domain superfamily	Homologous Superfamily
F [auth G], K [auth U], L [auth V]	IPR000995	Muscarinic acetylcholine receptor family	Family
F [auth G], K [auth U], L [auth V]	IPR000276	G protein-coupled receptor, rhodopsin-like	Family
F [auth G], K [auth U], L [auth V]	IPR017452	GPCR, rhodopsin-like, 7TM	Domain
F [auth G], K [auth U], L [auth V]	IPR001065	Muscarinic acetylcholine receptor M2	Family

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
F [auth G], K [auth U], L [auth V]	: P08172	diabetic polyneuropathy epilepsy Bradycardia diabetic autonomic neuropathy diabetic neuropathy alcohol abuse substance dependence biliary dyskinesia gastric ulcer large cell medulloblastoma brain injury depressive disorder schizophrenia substance abuse bipolar disorder diabetic polyneuropathy epilepsy Bradycardia diabetic autonomic neuropathy diabetic neuropathy alcohol abuse substance dependence biliary dyskinesia gastric ulcer large cell medulloblastoma brain injury depressive disorder schizophrenia substance abuse bipolar disorder major depressive disorder peptic ulcer disease psoriasis drug dependence substance-related disorder type 1 diabetes mellitus malignant colon neoplasm chronic obstructive pulmonary disease

Protein Modification Annotation

Modified Residue(s)
Chain	Residue(s)	Description
F [auth G], K [auth U], L [auth V]	SEP	Parent Component: SER : AA0037 : O-phospho-L-serine MOD:00046
F [auth G], K [auth U], L [auth V]	TPO	Parent Component: THR : AA0037 , AA0038 : O-phospho-L-serine MOD:00046 , O-phospho-L-threonine MOD:00047

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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.