6NI2 | pdb_00006ni2

Stabilized beta-arrestin 1-V2T subcomplex of a GPCR-G protein-beta-arrestin mega-complex

External Resource: Annotation

Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
SAbDab Antibody Annotation
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Pharos: Disease Associations
Membrane Protein Annotation: mpstruc
Protein Modification Annotation

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
B	SCOP2B Superfamily	Arrestin/Vps26-like	8055051	3002071	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)
A	ATP-synt	e6ni2A1	A: a/b three-layered sandwiches	X: P-loop domains-like	H: DUF1107-like	T: DUF1107-like	F: ATP-synt	ECOD (v294.1)
B	ATP-synt	e6ni2B1	A: a/b three-layered sandwiches	X: P-loop domains-like	H: DUF1107-like	T: DUF1107-like	F: ATP-synt	ECOD (v294.1)
C [auth H]	ATP-synt	e6ni2H1	A: a/b three-layered sandwiches	X: P-loop domains-like	H: DUF1107-like	T: DUF1107-like	F: ATP-synt	ECOD (v294.1)
D [auth L]	ATP-synt	e6ni2L1	A: a/b three-layered sandwiches	X: P-loop domains-like	H: DUF1107-like	T: DUF1107-like	F: ATP-synt	ECOD (v294.1)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
A	Heavy Chain	IGHV1	-	beta-arrestin-1 \| vasopressin v2 receptor	SAbDab (2026-03-27)
C [auth H]	Heavy Chain	IGHV3	-	beta-arrestin-1	SAbDab (2026-03-27)
D [auth L]	Light Chain	IGKV1	Kappa	beta-arrestin-1	SAbDab (2026-03-27)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
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
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	Nanobody 32	-	-	-
B	Beta-arrestin-1	clathrin binding protein binding binding protein-containing complex binding AP-2 adaptor complex binding clathrin heavy chain binding signaling receptor binding acetylcholine receptor binding small molecule binding ion binding phosphatidylinositol-3,4,5-trisphosphate binding anion binding phospholipid binding lipid binding clathrin binding protein binding binding protein-containing complex binding AP-2 adaptor complex binding clathrin heavy chain binding signaling receptor binding acetylcholine receptor binding small molecule binding ion binding phosphatidylinositol-3,4,5-trisphosphate binding anion binding phospholipid binding lipid binding phosphatidylinositol phosphate binding phosphatidylinositol binding molecular adaptor activity G protein-coupled 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 multicellular organismal process system process sensory perception nervous system process clathrin-dependent endocytosis cell surface receptor signaling pathway Notch signaling pathway negative regulation of Notch signaling pathway regulation of Notch signaling pathway catabolic process primary metabolic process protein catabolic process macromolecule catabolic process modification-dependent macromolecule catabolic process modification-dependent protein catabolic process ubiquitin-dependent protein catabolic process metabolic process protein metabolic process macromolecule metabolic process positive regulation of phosphorylation regulation of protein modification process regulation of protein phosphorylation positive regulation of protein metabolic process positive regulation of phosphate metabolic process regulation of primary metabolic process positive regulation of metabolic process positive regulation of protein modification process phosphate-containing compound metabolic process positive regulation of macromolecule metabolic process positive regulation of protein phosphorylation phosphorus metabolic process protein modification process protein phosphorylation positive regulation of phosphorus metabolic process phosphorylation regulation of protein metabolic process regulation of macromolecule metabolic process macromolecule modification regulation of phosphorus metabolic process regulation of phosphorylation regulation of metabolic process G protein-coupled receptor internalization	cell projection cellular anatomical structure pseudopodium plasma membrane bounded cell projection protein-containing complex intracellular anatomical structure plasma membrane protein complex membrane plasma membrane membrane protein complex coated membrane endomembrane system clathrin coat membrane coat cell projection cellular anatomical structure pseudopodium plasma membrane bounded cell projection protein-containing complex intracellular anatomical structure plasma membrane protein complex membrane plasma membrane membrane protein complex coated membrane endomembrane system clathrin coat membrane coat cell periphery clathrin-coated pit cytoplasm clathrin coat of coated pit cytosol membrane-bounded organelle intracellular organelle cytoplasmic vesicle organelle intracellular vesicle intracellular membrane-bounded organelle vesicle nucleus
C [auth H]	Fab30 Heavy Chain	-	-	-
D [auth L]	Fab30 Light Chain	-	-	-
E [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 renal system process transport homeostatic process fluid transport establishment of localization water transport renal water transport localization multicellular organismal-level homeostasis chemical homeostasis renal absorption multicellular organismal-level water homeostasis multicellular organismal-level chemical homeostasis renal water absorption renal water homeostasis 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 adenylate cyclase-activating G protein-coupled receptor signaling pathway 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 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

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
B	IPR011022	Arrestin-like, C-terminal domain	Domain
B	IPR000698	Arrestin	Family
B	IPR011021	Arrestin-like, N-terminal	Domain
B	IPR014753	Arrestin, N-terminal	Homologous Superfamily
B	IPR014756	Immunoglobulin E-set	Homologous Superfamily
B	IPR017864	Arrestin, conserved site	Conserved Site
B	IPR014752	Arrestin-like, C-terminal domain superfamily	Homologous Superfamily
E [auth V]	IPR000161	Vasopressin V2 receptor	Family
E [auth V]	IPR000276	G protein-coupled receptor, rhodopsin-like	Family
E [auth V]	IPR017452	GPCR, rhodopsin-like, 7TM	Domain
E [auth V]	IPR001817	Vasopressin receptor	Family

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
E [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

Membrane Protein Annotation: mpstruc mpstruc Database Homepage

Chains	Resource Link	Group	Subgroup	Protein
B, E [auth V]	mpstruc	TRANSMEMBRANE PROTEINS: ALPHA-HELICAL	G Protein-Coupled Receptors: Class A	β₂V₂R-Gs protein subcomplex of a GPCR-G protein-beta-arrestin mega-complex

Protein Modification Annotation

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

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.