Annotations: 8I0Q

Structure of beta-arrestin1 in complex with a phosphopeptide corresponding to the human C-X-C chemokine receptor type 4, CXCR4 (Local refine)

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	UBA	e8i0qA1	A: beta barrels	X: RNase A-like	H: RNase A-like	T: RNase A-like	F: UBA	ECOD (v294.2)
B	UBA	e8i0qB1	A: beta barrels	X: RNase A-like	H: RNase A-like	T: RNase A-like	F: UBA	ECOD (v294.2)
C [auth H]	UBA	e8i0qH1	A: beta barrels	X: RNase A-like	H: RNase A-like	T: RNase A-like	F: UBA	ECOD (v294.2)
D [auth I]	UBA	e8i0qI1	A: beta barrels	X: RNase A-like	H: RNase A-like	T: RNase A-like	F: UBA	ECOD (v294.2)
E [auth L]	UBA	e8i0qL1	A: beta barrels	X: RNase A-like	H: RNase A-like	T: RNase A-like	F: UBA	ECOD (v294.2)
F [auth M]	UBA	e8i0qM1	A: beta barrels	X: RNase A-like	H: RNase A-like	T: RNase A-like	F: UBA	ECOD (v294.2)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
C [auth H], D [auth I]	Heavy Chain	IGHV3	-	beta-arrestin-1 \| c-x-c chemokine receptor type 4	SAbDab (2026-05-15)
E [auth L], F [auth M]	Light Chain	IGKV1	Kappa	beta-arrestin-1 \| c-x-c chemokine receptor type 4	SAbDab (2026-05-15)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	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	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	Beta-arrestin-1	enzyme regulator activity molecular function inhibitor activity peptidase regulator activity molecular function regulator activity enzyme inhibitor activity cysteine-type endopeptidase inhibitor activity peptidase inhibitor activity endopeptidase regulator activity endopeptidase inhibitor activity phosphoprotein binding protein binding binding kinase binding enzyme binding enzyme regulator activity molecular function inhibitor activity peptidase regulator activity molecular function regulator activity enzyme inhibitor activity cysteine-type endopeptidase inhibitor activity peptidase inhibitor activity endopeptidase regulator activity endopeptidase inhibitor activity phosphoprotein binding protein binding binding kinase binding enzyme binding protein kinase binding mitogen-activated protein kinase kinase binding arrestin family protein binding protein-containing complex binding AP-2 adaptor complex binding GTPase regulator activity enzyme activator activity GTPase activator activity molecular function activator activity nucleoside-triphosphatase regulator activity protein phosphorylated amino acid binding angiotensin receptor binding signaling receptor binding G protein-coupled receptor binding molecular adaptor activity ubiquitin protein ligase binding ubiquitin-like protein ligase binding insulin-like growth factor receptor binding clathrin binding adrenergic receptor binding alpha-1B adrenergic receptor binding transcription coactivator activity transcription regulator activity transcription coregulator activity transmembrane transporter binding alpha-1A adrenergic receptor binding cargo adaptor activity protein-macromolecule adaptor activity clathrin-cargo adaptor activity follicle-stimulating hormone receptor binding vasopressin receptor binding V2 vasopressin receptor binding transcription factor binding RNA polymerase II-specific DNA-binding transcription factor binding nuclear receptor binding DNA-binding transcription factor binding nuclear estrogen receptor binding	response to stimulus response to chemical response to xenobiotic stimulus interleukin-6 production multicellular organismal process regulation of cellular process negative regulation of biological process regulation of interleukin-6 production regulation of cytokine production cytokine production negative regulation of cellular process regulation of multicellular organismal process negative regulation of macromolecule metabolic process regulation of biosynthetic process response to stimulus response to chemical response to xenobiotic stimulus interleukin-6 production multicellular organismal process regulation of cellular process negative regulation of biological process regulation of interleukin-6 production regulation of cytokine production cytokine production negative regulation of cellular process regulation of multicellular organismal process negative regulation of macromolecule metabolic process regulation of biosynthetic process regulation of biological process negative regulation of metabolic process biological regulation negative regulation of cytokine production regulation of macromolecule metabolic process gene expression macromolecule biosynthetic process regulation of gene expression negative regulation of interleukin-6 production negative regulation of gene expression biosynthetic process negative regulation of biosynthetic process negative regulation of macromolecule biosynthetic process regulation of macromolecule biosynthetic process metabolic process cellular process macromolecule metabolic process negative regulation of multicellular organismal process regulation of metabolic process negative regulation of post-translational protein modification regulation of protein modification process regulation of protein ubiquitination regulation of primary metabolic process protein ubiquitination negative regulation of protein modification process protein metabolic process negative regulation of protein ubiquitination regulation of protein modification by small protein conjugation or removal protein modification process negative regulation of protein metabolic process negative regulation of protein modification by small protein conjugation or removal regulation of post-translational protein modification regulation of protein metabolic process primary metabolic process macromolecule modification post-translational protein modification protein modification by small protein conjugation protein modification by small protein conjugation or removal actomyosin structure organization actin cytoskeleton organization actin filament organization cellular component organization cellular component biogenesis organelle organization cellular component assembly actin filament bundle organization contractile actin filament bundle assembly actin filament-based process actin filament bundle assembly stress fiber assembly cellular component organization or biogenesis supramolecular fiber organization cytoskeleton organization regulation of apoptotic process apoptotic process regulation of programmed cell death cell death programmed cell death cellular response to stimulus negative adaptation of signaling pathway negative regulation of signaling signaling desensitization of G protein-coupled receptor signaling pathway regulation of signal transduction negative regulation of G protein-coupled receptor signaling pathway negative regulation of cell communication cell communication signal transduction regulation of G protein-coupled receptor signaling pathway regulation of signaling negative regulation of response to stimulus negative regulation of signal transduction regulation of response to stimulus adaptation of signaling pathway regulation of cell communication G protein-coupled receptor signaling pathway negative regulation of intracellular signal transduction intracellular signal transduction regulation of intracellular signal transduction intracellular signaling cassette regulation of MAPK cascade negative regulation of ERK1 and ERK2 cascade MAPK cascade ERK1 and ERK2 cascade regulation of ERK1 and ERK2 cascade negative regulation of MAPK cascade ovulation cycle process reproductive process sex differentiation development of primary female sexual characteristics developmental process involved in reproduction ovulation cycle multicellular organism development development of primary sexual characteristics anatomical structure development reproductive structure development ovarian follicle development system development rhythmic process developmental process gonad development reproductive system development female gonad development multicellular organismal reproductive process animal organ development female sex differentiation follicle-stimulating hormone signaling pathway regulation of inositol phosphate biosynthetic process regulation of inositol trisphosphate biosynthetic process alcohol metabolic process inositol phosphate metabolic process regulation of small molecule metabolic process phosphate-containing compound metabolic process polyol biosynthetic process inositol trisphosphate metabolic process small molecule metabolic process phosphorus metabolic process regulation of carbohydrate metabolic process carbohydrate metabolic process polyol metabolic process regulation of alcohol biosynthetic process small molecule biosynthetic process inositol trisphosphate biosynthetic process carbohydrate biosynthetic process organophosphate metabolic process organophosphate biosynthetic process inositol phosphate biosynthetic process alcohol biosynthetic process regulation of phosphorus metabolic process regulation of carbohydrate biosynthetic process system process sensory perception nervous system process catabolic process protein catabolic process macromolecule catabolic process modification-dependent macromolecule catabolic process modification-dependent protein catabolic process ubiquitin-dependent protein catabolic process RNA metabolic process nucleobase-containing compound metabolic process RNA biosynthetic process nucleic acid biosynthetic process DNA-templated transcription regulation of RNA metabolic process regulation of nucleobase-containing compound metabolic process regulation of RNA biosynthetic process nucleobase-containing compound biosynthetic process nucleic acid metabolic process regulation of DNA-templated transcription response to morphine response to isoquinoline alkaloid response to nitrogen compound response to alkaloid negative regulation of interleukin-8 production interleukin-8 production regulation of interleukin-8 production positive regulation of DNA-templated transcription positive regulation of biological process positive regulation of macromolecule biosynthetic process positive regulation of metabolic process transcription by RNA polymerase II positive regulation of biosynthetic process positive regulation of macromolecule metabolic process positive regulation of cellular process regulation of transcription by RNA polymerase II positive regulation of transcription by RNA polymerase II positive regulation of RNA metabolic process positive regulation of RNA biosynthetic process import into cell receptor internalization transport vesicle-mediated transport localization G protein-coupled receptor internalization establishment of localization receptor-mediated endocytosis endocytosis positive regulation of cell communication positive regulation of signal transduction positive regulation of response to stimulus positive regulation of ERK1 and ERK2 cascade positive regulation of MAPK cascade positive regulation of intracellular signal transduction positive regulation of signaling negative regulation of programmed cell death negative regulation of apoptotic process 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 positive regulation of endocytosis 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 small GTPase-mediated signal transduction regulation of small GTPase mediated signal transduction Rho protein signal transduction regulation of Rho protein signal transduction positive regulation of Rho protein signal transduction positive regulation of small GTPase mediated signal transduction adenylate cyclase-modulating G protein-coupled receptor signaling pathway positive regulation of protein metabolic process positive regulation of post-translational protein modification positive regulation of protein modification process positive regulation of protein modification by small protein conjugation or removal positive regulation of protein ubiquitination neuron apoptotic process negative regulation of neuron apoptotic process regulation of neuron apoptotic process proteasomal protein catabolic process proteasome-mediated ubiquitin-dependent protein catabolic process cell surface receptor signaling pathway Notch signaling pathway negative regulation of Notch signaling pathway regulation of Notch signaling pathway cell population proliferation positive regulation of cell population proliferation regulation of cell population proliferation sensory perception of touch sensory perception of mechanical stimulus nitrogen compound transport positive regulation of establishment of protein localization carbohydrate homeostasis establishment of localization in cell positive regulation of insulin secretion involved in cellular response to glucose stimulus positive regulation of insulin secretion regulation of biological quality regulation of peptide hormone secretion regulation of hormone levels positive regulation of peptide hormone secretion establishment of protein localization to extracellular region intracellular glucose homeostasis protein secretion cellular response to oxygen-containing compound regulation of protein secretion regulation of secretion cellular response to carbohydrate stimulus chemical homeostasis response to glucose glucose homeostasis positive regulation of protein localization insulin secretion involved in cellular response to glucose stimulus cellular localization regulation of hormone secretion regulation of protein localization regulation of peptide secretion homeostatic process positive regulation of secretion by cell hormone secretion protein localization to extracellular region positive regulation of protein transport peptide secretion regulation of secretion by cell secretion by cell positive regulation of hormone secretion response to monosaccharide response to carbohydrate positive regulation of secretion signal release cellular response to hexose stimulus intracellular chemical homeostasis cellular response to monosaccharide stimulus positive regulation of peptide secretion secretion regulation of peptide transport regulation of establishment of protein localization export from cell cell-cell signaling response to oxygen-containing compound cellular response to glucose stimulus regulation of protein transport positive regulation of protein secretion peptide transport response to hexose cellular response to chemical stimulus cellular homeostasis regulation of cellular localization regulation of insulin secretion peptide hormone secretion regulation of insulin secretion involved in cellular response to glucose stimulus hormone transport insulin secretion phototransduction detection of light stimulus response to light stimulus detection of external stimulus response to external stimulus detection of abiotic stimulus detection of stimulus response to abiotic stimulus response to radiation positive regulation of phosphorylation regulation of protein phosphorylation positive regulation of phosphate metabolic process positive regulation of protein phosphorylation protein phosphorylation positive regulation of phosphorus metabolic process phosphorylation regulation of phosphorylation	cell projection cellular anatomical structure pseudopodium plasma membrane bounded cell projection cell periphery postsynapse postsynaptic membrane synapse cell junction membrane plasma membrane plasma membrane region synaptic membrane clathrin-coated pit cell projection cellular anatomical structure pseudopodium plasma membrane bounded cell projection cell periphery postsynapse postsynaptic membrane synapse cell junction membrane plasma membrane plasma membrane region synaptic membrane clathrin-coated pit endomembrane system intracellular anatomical structure cytoplasm cytosol basal part of cell basal plasma membrane basolateral plasma membrane intracellular organelle organelle membraneless organelle intracellular membraneless organelle chromatin chromosome glutamatergic synapse neuron spine neuron projection dendritic spine somatodendritic compartment dendrite dendritic tree membrane-bounded organelle nucleus membrane-enclosed lumen intracellular membrane-bounded organelle intracellular organelle lumen nucleoplasm organelle lumen nuclear lumen cytoplasmic vesicle intracellular vesicle vesicle endosome postsynaptic density neuron to neuron synapse postsynaptic specialization asymmetric synapse nuclear body
C [auth H], D [auth I]	Fab30 Heavy Chain	-	-	-
E [auth L], F [auth M]	Fab30 Light Chain	-	-	-
G [auth U], H [auth V]	C-X-C chemokine receptor type 4	molecular transducer activity coreceptor activity signaling receptor activity cytoskeletal protein binding myosin light chain binding protein binding binding myosin binding C-C chemokine binding chemokine binding cytokine binding G protein-coupled chemoattractant receptor activity C-X-C motif chemokine 12 receptor activity C-X-C chemokine receptor activity molecular transducer activity coreceptor activity signaling receptor activity cytoskeletal protein binding myosin light chain binding protein binding binding myosin binding C-C chemokine binding chemokine binding cytokine binding G protein-coupled chemoattractant receptor activity C-X-C motif chemokine 12 receptor activity C-X-C chemokine receptor activity chemokine receptor activity G protein-coupled receptor activity transmembrane signaling receptor activity cytokine receptor activity immune receptor activity ubiquitin protein ligase binding ubiquitin-like protein ligase binding enzyme binding virus receptor activity exogenous protein binding C-C chemokine receptor activity ubiquitin binding ubiquitin-like protein binding actin binding	developmental process multicellular organism development multicellular organismal process head development central nervous system development anatomical structure development animal organ development brain development nervous system development system development regulation of biological process cell adhesion regulation of cellular process regulation of cell adhesion developmental process multicellular organism development multicellular organismal process head development central nervous system development anatomical structure development animal organ development brain development nervous system development system development regulation of biological process cell adhesion regulation of cellular process regulation of cell adhesion biological regulation cellular process apoptotic process cell death programmed cell death membrane organization cellular component organization myelination myelin maintenance axon ensheathment ensheathment of neurons plasma membrane organization cellular component organization or biogenesis endomembrane system organization cell chemotaxis cellular response to stimulus chemotaxis dendritic cell chemotaxis response to stimulus response to external stimulus leukocyte migration dendritic cell migration cellular response to chemical stimulus taxis immune system process response to chemical mononuclear cell migration cell migration cell motility leukocyte chemotaxis locomotion response to decreased oxygen levels response to hypoxia response to stress response to oxygen levels response to abiotic stimulus positive regulation of cytosolic calcium ion concentration regulation of biological quality neurogenesis cellular developmental process cell differentiation immune response cell surface receptor signaling pathway chemokine (C-X-C motif) ligand 12 signaling pathway signaling CXCL12-activated CXCR4 signaling pathway response to cytokine response to chemokine cytokine-mediated signaling pathway cellular response to chemokine chemokine-mediated signaling pathway cell communication response to peptide G protein-coupled receptor signaling pathway cellular response to cytokine stimulus signal transduction C-X-C chemokine receptor CXCR4 signaling pathway intracellular signal transduction calcium-mediated signaling intracellular signaling cassette regulation of multicellular organismal development regulation of developmental process positive regulation of biological process vasculature development regulation of vasculature development circulatory system development positive regulation of developmental process positive regulation of vasculature development positive regulation of multicellular organismal process regulation of multicellular organismal process positive regulation of cell communication positive regulation of signal transduction regulation of signal transduction positive regulation of macrophage migration inhibitory factor signaling pathway positive regulation of response to cytokine stimulus positive regulation of response to stimulus macrophage migration inhibitory factor signaling pathway positive regulation of cellular process regulation of signaling regulation of macrophage migration inhibitory factor signaling pathway regulation of cytokine-mediated signaling pathway regulation of response to cytokine stimulus regulation of response to stimulus regulation of cell communication positive regulation of cytokine-mediated signaling pathway positive regulation of signaling homeostatic process adaptive thermogenesis multicellular organismal-level homeostasis regulation of cold-induced thermogenesis cold-induced thermogenesis temperature homeostasis positive regulation of cold-induced thermogenesis positive regulation of locomotion regulation of cell motility positive regulation of cell migration regulation of locomotion positive regulation of cell motility regulation of cell migration adenylate cyclase-inhibiting G protein-coupled receptor signaling pathway adenylate cyclase-modulating G protein-coupled receptor signaling pathway biological process involved in interspecies interaction between organisms response to other organism response to external biotic stimulus response to virus response to biotic stimulus defense response inflammatory response positive regulation of nervous system development cell development regulation of neurogenesis regulation of cell differentiation regulation of gliogenesis positive regulation of gliogenesis regulation of cell development regulation of nervous system development gliogenesis positive regulation of cell differentiation positive regulation of neurogenesis positive regulation of oligodendrocyte differentiation positive regulation of cell development regulation of glial cell differentiation positive regulation of glial cell differentiation oligodendrocyte differentiation glial cell differentiation regulation of oligodendrocyte differentiation	cell periphery cellular anatomical structure cell surface membrane plasma membrane external side of plasma membrane side of membrane extracellular exosome membrane-bounded organelle extracellular vesicle extracellular organelle extracellular region organelle vesicle cell periphery cellular anatomical structure cell surface membrane plasma membrane external side of plasma membrane side of membrane extracellular exosome membrane-bounded organelle extracellular vesicle extracellular organelle extracellular region organelle vesicle extracellular membrane-bounded organelle cell leading edge intracellular anatomical structure cytoplasm anchoring junction cell junction intracellular organelle lytic vacuole vacuole intracellular membrane-bounded organelle lysosome protein-containing complex cytoplasmic vesicle intracellular vesicle early endosome endosome endomembrane system late endosome

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR011022	Arrestin-like, C-terminal domain	Domain
A, B	IPR000698	Arrestin	Family
A, B	IPR014753	Arrestin, N-terminal	Homologous Superfamily
A, B	IPR014756	Immunoglobulin E-set	Homologous Superfamily
A, B	IPR014752	Arrestin-like, C-terminal domain superfamily	Homologous Superfamily
A, B	IPR011021	Arrestin-like, N-terminal	Domain
A, B	IPR017864	Arrestin, conserved site	Conserved Site
G [auth U], H [auth V]	IPR000355	Chemokine receptor family	Family
G [auth U], H [auth V]	IPR022726	CXC chemokine receptor 4 N-terminal domain	Domain
G [auth U], H [auth V]	IPR000276	G protein-coupled receptor, rhodopsin-like	Family
G [auth U], H [auth V]	IPR017452	GPCR, rhodopsin-like, 7TM	Domain
G [auth U], H [auth V]	IPR001277	CXC chemokine receptor 4/atypical chemokine receptor 2	Family
G [auth U], H [auth V]	IPR050119	C-C chemokine receptor type 1-9-like	Family

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
G [auth U], H [auth V]	: P61073	WHIM syndrome juvenile idiopathic arthritis rheumatoid arthritis breast carcinoma Neoplasm Invasiveness breast cancer neuralgia interstitial cystitis juvenile dermatomyositis osteosarcoma lung carcinoma pilocytic astrocytoma primitive neuroectodermal tumor AIDS lymphoplasmacytic lymphoma WHIM syndrome juvenile idiopathic arthritis rheumatoid arthritis breast carcinoma Neoplasm Invasiveness breast cancer neuralgia interstitial cystitis juvenile dermatomyositis osteosarcoma lung carcinoma pilocytic astrocytoma primitive neuroectodermal tumor AIDS lymphoplasmacytic lymphoma Sjogren syndrome atypical teratoid rhabdoid tumor malignant mesothelioma Waldenstrom macroglobulinemia breast disease congenital anemia nephrosclerosis ductal breast carcinoma in situ glioblastoma invasive ductal breast carcinoma ovarian cancer large cell medulloblastoma periodontitis lung disease pituitary cancer psoriasis astrocytic tumor malignant ependymoma tuberculosis cancer cutaneous lupus erythematosus dermatomyositis esophageal adenocarcinoma hematologic disease oligodendroglioma pancreatic ductal adenocarcinoma lung cancer plasma cell myeloma lymphatic system disease atopic eczema malignant glioma ulcerative colitis malignant pancreatic neoplasm medulloblastoma cystic fibrosis Down syndrome gastric carcinoma

Protein Modification Annotation

Modified Residue(s)
Chain	Residue(s)	Description
G [auth U], H [auth V]	SEP	Parent Component: SER : AA0037 : O-phospho-L-serine MOD:00046
G [auth U], H [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.