Annotations: 9CX3

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
B [auth C]	SCOP2B Superfamily	SH3-domain	8041599	3000153	SCOP2B (2022-06-29)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
F [auth L]	Light Chain	IGKV1	Kappa	beta-arrestin-1	SAbDab (2025-11-28)
C [auth H]	Heavy Chain	IGHV3	-	beta-arrestin-1	SAbDab (2025-11-28)
A	Heavy Chain	IGHV1	-	beta-arrestin-1 \| vasopressin v2 receptor	SAbDab (2025-11-28)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
E [auth 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
E [auth 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
B [auth C]	PF00018	SH3 domain (SH3_1)	SH3 domain	SH3 (Src homology 3) domains are often indicative of a protein involved in signal transduction related to cytoskeletal organisation. First described in the Src cytoplasmic tyrosine kinase Swiss:P12931. The structure is a partly opened beta barrel.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
F [auth L]	Antibody fragment Fab30, light chain	-	-	-
E [auth B]	Beta-arrestin-1	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 regulator activity enzyme activator activity GTPase activator 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 regulator activity enzyme activator activity GTPase activator activity molecular function activator activity nucleoside-triphosphatase regulator activity molecular function 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 protein-macromolecule adaptor activity cysteine-type endopeptidase inhibitor activity involved in apoptotic process cysteine-type endopeptidase regulator activity involved in apoptotic process transmembrane transporter binding alpha-1A adrenergic receptor binding cargo adaptor activity clathrin 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 signaling negative regulation of signaling negative regulation of intracellular signal transduction regulation of signal transduction intracellular signal transduction negative regulation of cell communication cell communication regulation of intracellular signal transduction intracellular signaling cassette signal transduction regulation of signaling negative regulation of response to stimulus regulation of MAPK cascade negative regulation of signal transduction negative regulation of ERK1 and ERK2 cascade regulation of response to stimulus MAPK cascade regulation of cell communication 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 G protein-coupled receptor 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 catabolic process proteolysis involved in protein catabolic process protein catabolic process macromolecule catabolic process modification-dependent macromolecule catabolic process modification-dependent protein catabolic process proteolysis 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 regulation of G protein-coupled receptor signaling pathway 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 negative adaptation of signaling pathway import into cell receptor internalization transport desensitization of G protein-coupled receptor signaling pathway negative regulation of G protein-coupled receptor signaling pathway vesicle-mediated transport localization G protein-coupled receptor internalization establishment of localization adaptation of signaling pathway 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 nitrogen compound transport 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 system process sensory perception nervous system process sensory perception of touch sensory perception of mechanical stimulus 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 amide transport 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 cytoplasmic vesicle intracellular vesicle intracellular membrane-bounded organelle vesicle endosome postsynaptic density neuron to neuron synapse postsynaptic specialization asymmetric synapse nucleus
D [auth V]	Vasopressin V2 receptor	vasopressin receptor activity peptide receptor activity molecular transducer activity G protein-coupled receptor activity G protein-coupled peptide receptor activity signaling receptor activity transmembrane signaling receptor activity	regulation of body fluid levels hemostasis biological regulation regulation of biological quality regulation of tube diameter multicellular organismal process regulation of biological process system process regulation of tube size regulation of system process positive regulation of biological process positive regulation of vasoconstriction circulatory system process regulation of blood circulation regulation of body fluid levels hemostasis biological regulation regulation of biological quality regulation of tube diameter multicellular organismal process regulation of biological process system process regulation of tube size regulation of system process 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 vasoconstriction blood circulation regulation of anatomical structure size regulation of biosynthetic process regulation of cellular process regulation of macromolecule metabolic process gene expression macromolecule biosynthetic process positive regulation of macromolecule biosynthetic process regulation of gene expression positive regulation of metabolic process biosynthetic process positive regulation of gene expression positive regulation of biosynthetic process regulation of macromolecule biosynthetic process metabolic process cellular process positive regulation of macromolecule metabolic process macromolecule metabolic process regulation of metabolic process positive regulation of cellular process cellular response to stimulus response to stimulus signaling cell communication adenylate cyclase-modulating G protein-coupled receptor signaling pathway G protein-coupled receptor signaling pathway signal transduction cellular response to endogenous stimulus cellular response to chemical stimulus response to hormone response to endogenous stimulus response to chemical cellular response to hormone stimulus response to peptide response to cytokine regulation of systemic arterial blood pressure by hormone regulation of systemic arterial blood pressure mediated by a chemical signal regulation of blood pressure regulation of systemic arterial blood pressure endocrine process regulation of systemic arterial blood pressure by vasopressin cell population proliferation positive regulation of cell population proliferation regulation of cell population proliferation positive regulation of cell communication regulation of signaling positive regulation of signal transduction positive regulation of intracellular signal transduction regulation of signal transduction intracellular signal transduction positive regulation of response to stimulus regulation of intracellular signal transduction regulation of response to stimulus regulation of cell communication positive regulation of signaling renal system process regulation of urine volume renal water retention negative regulation of urine volume developmental process head development forebrain development animal organ development brain development nervous system development multicellular organism development central nervous system development anatomical structure development telencephalon development system development negative regulation of cell population proliferation negative regulation of cellular process negative regulation of biological process positive regulation of adenylate cyclase activity positive regulation of molecular function regulation of molecular function positive regulation of cyclase activity activation of adenylate cyclase activity regulation of adenylate cyclase activity regulation of catalytic activity positive regulation of catalytic activity positive regulation of lyase activity positive regulation of systemic arterial blood pressure positive regulation of blood pressure	cellular anatomical structure 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 cellular anatomical structure 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 cell periphery plasma membrane Golgi apparatus endomembrane system endosome perinuclear region of cytoplasm endoplasmic reticulum
C [auth H]	Antibody fragment Fab30, heavy chain	-	-	-
B [auth C]	Proto-oncogene tyrosine-protein kinase Src	protein binding binding signaling receptor binding protein phosphatase binding phosphatase binding enzyme binding protein tyrosine kinase activity catalytic activity, acting on a protein kinase activity protein kinase activity transferase activity catalytic activity phosphotransferase activity, alcohol group as acceptor transferase activity, transferring phosphorus-containing groups protein binding binding signaling receptor binding protein phosphatase binding phosphatase binding enzyme binding protein tyrosine kinase activity catalytic activity, acting on a protein kinase activity protein kinase activity transferase activity catalytic activity phosphotransferase activity, alcohol group as acceptor transferase activity, transferring phosphorus-containing groups adenyl ribonucleotide binding nucleotide binding purine ribonucleotide binding purine ribonucleoside triphosphate binding nucleoside phosphate binding ion binding purine nucleotide binding anion binding adenyl nucleotide binding ATP binding heterocyclic compound binding carbohydrate derivative binding ribonucleotide binding small molecule binding non-membrane spanning protein tyrosine kinase activity tetrapyrrole binding heme binding connexin binding	developmental process cellular developmental process cell differentiation cellular process cellular response to stimulus regulation of cellular process response to stimulus signaling negative regulation of signaling negative regulation of intracellular signal transduction negative regulation of biological process regulation of signal transduction regulation of programmed cell death regulation of intrinsic apoptotic signaling pathway developmental process cellular developmental process cell differentiation cellular process cellular response to stimulus regulation of cellular process response to stimulus signaling negative regulation of signaling negative regulation of intracellular signal transduction negative regulation of biological process regulation of signal transduction regulation of programmed cell death regulation of intrinsic apoptotic signaling pathway intracellular signal transduction negative regulation of cell communication cell communication regulation of intracellular signal transduction negative regulation of apoptotic signaling pathway negative regulation of cellular process signal transduction intrinsic apoptotic signaling pathway regulation of biological process regulation of signaling negative regulation of response to stimulus negative regulation of programmed cell death regulation of apoptotic process biological regulation cell death negative regulation of signal transduction negative regulation of intrinsic apoptotic signaling pathway apoptotic signaling pathway negative regulation of apoptotic process regulation of response to stimulus regulation of cell communication apoptotic process programmed cell death regulation of apoptotic signaling pathway immune system process cell surface receptor signaling pathway cell surface receptor protein tyrosine kinase signaling pathway ERBB signaling pathway epidermal growth factor receptor signaling pathway enzyme-linked receptor protein signaling pathway cell adhesion extrinsic apoptotic signaling pathway negative regulation of extrinsic apoptotic signaling pathway regulation of extrinsic apoptotic signaling pathway intracellular receptor signaling pathway response to lipid progesterone receptor signaling pathway hormone-mediated signaling pathway cellular response to endogenous stimulus response to hormone response to steroid hormone nuclear receptor-mediated steroid hormone signaling pathway cellular response to steroid hormone stimulus steroid hormone receptor signaling pathway cellular response to hormone stimulus response to endogenous stimulus cellular response to chemical stimulus response to chemical cellular response to lipid nuclear receptor-mediated signaling pathway cell cycle regulation of cell cycle	cellular anatomical structure cell junction membrane-bounded organelle mitochondrial membrane intracellular anatomical structure organelle inner membrane mitochondrion membrane intracellular membrane-bounded organelle mitochondrial inner membrane intracellular organelle organelle envelope organelle mitochondrial envelope cellular anatomical structure cell junction membrane-bounded organelle mitochondrial membrane intracellular anatomical structure organelle inner membrane mitochondrion membrane intracellular membrane-bounded organelle mitochondrial inner membrane intracellular organelle organelle envelope organelle mitochondrial envelope cytoplasm organelle membrane anchoring junction focal adhesion cell-substrate junction cell-cell junction cytosol cell periphery plasma membrane protein-containing complex cytoskeleton membraneless organelle intracellular membraneless organelle perinuclear region of cytoplasm endosome membrane endosome intracellular vesicle endomembrane system cytoplasmic vesicle membrane bounding membrane of organelle vesicle membrane cytoplasmic vesicle vesicle nucleus
A	Nanobody 32	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
E [auth B]	IPR000698	Arrestin	Family
E [auth B]	IPR014753	Arrestin, N-terminal	Homologous Superfamily
E [auth B]	IPR014756	Immunoglobulin E-set	Homologous Superfamily
E [auth B]	IPR011021	Arrestin-like, N-terminal	Domain
E [auth B]	IPR014752	Arrestin-like, C-terminal	Homologous Superfamily
E [auth B]	IPR017864	Arrestin, conserved site	Conserved Site
E [auth B]	IPR011022	Arrestin C-terminal-like domain	Domain
D [auth V]	IPR000161	Vasopressin V2 receptor	Family
D [auth V]	IPR000276	G protein-coupled receptor, rhodopsin-like	Family
D [auth V]	IPR017452	GPCR, rhodopsin-like, 7TM	Domain
D [auth V]	IPR001817	Vasopressin receptor	Family
B [auth C]	IPR017441	Protein kinase, ATP binding site	Binding Site
B [auth C]	IPR036860	SH2 domain superfamily	Homologous Superfamily
B [auth C]	IPR008266	Tyrosine-protein kinase, active site	Active Site
B [auth C]	IPR020635	Tyrosine-protein kinase, catalytic domain	Domain
B [auth C]	IPR000980	SH2 domain	Domain
B [auth C]	IPR036028	SH3-like domain superfamily	Homologous Superfamily
B [auth C]	IPR000719	Protein kinase domain	Domain
B [auth C]	IPR001245	Serine-threonine/tyrosine-protein kinase, catalytic domain	Domain
B [auth C]	IPR011009	Protein kinase-like domain superfamily	Homologous Superfamily
B [auth C]	IPR001452	SH3 domain	Domain
B [auth C]	IPR050198	Non-receptor tyrosine kinases involved in cell signaling	Family

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
D [auth V]	Pharos: P30518	nephrogenic diabetes insipidus nephrogenic syndrome of inappropriate antidiuresis congenital adrenal hyperplasia cardiomyopathy congestive heart failure diabetes insipidus, nephrogenic, X-linked Oliguria diabetes insipidus X-linked disease inappropriate ADH syndrome hereditary von Willebrand disease intellectual disability systemic lupus erythematosus kidney disease diabetes insipidus, nephrogenic, autosomal nephrogenic diabetes insipidus nephrogenic syndrome of inappropriate antidiuresis congenital adrenal hyperplasia cardiomyopathy congestive heart failure diabetes insipidus, nephrogenic, X-linked Oliguria diabetes insipidus X-linked disease inappropriate ADH syndrome hereditary von Willebrand disease intellectual disability systemic lupus erythematosus kidney disease diabetes insipidus, nephrogenic, autosomal hemophilia A autosomal dominant hypophosphatemic rickets celiac disease rheumatoid arthritis genetic endocrine growth disease heart failure

Protein Modification Annotation

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