Annotations: 8Z74

Cryo-EM structure of APJR complex with agonistic antibody

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
Membrane Protein Annotation: PDBTM
Membrane Protein Annotation: mpstruc

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
D	Fe_hyd_SSU	e8z74D1	A: alpha arrays	X: Hypothetical protein YqbG-like	H: Hypothetical protein YqbG-like	T: alpha/beta-Hydrolases	F: Fe_hyd_SSU	ECOD (v295.2)
C	Fe_hyd_SSU	e8z74C1	A: alpha arrays	X: Hypothetical protein YqbG-like	H: Hypothetical protein YqbG-like	T: alpha/beta-Hydrolases	F: Fe_hyd_SSU	ECOD (v295.2)
B	Fe_hyd_SSU	e8z74B1	A: alpha arrays	X: Hypothetical protein YqbG-like	H: Hypothetical protein YqbG-like	T: alpha/beta-Hydrolases	F: Fe_hyd_SSU	ECOD (v295.2)
A	C1-set	e8z74A01	A: alpha arrays	X: Hypothetical protein YqbG-like	H: Hypothetical protein YqbG-like	T: alpha/beta-Hydrolases	F: C1-set	ECOD (v295.2)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
A, B	Heavy Chain	IGHV1	-	soluble cytochrome b562,apelin receptor	SAbDab (2026-10-16)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
C, D	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
C, D	Soluble cytochrome b562,Apelin receptor	binding tetrapyrrole binding heme binding electron transfer activity cation binding transition metal ion binding iron ion binding ion binding metal ion binding small molecule binding peptide receptor activity molecular transducer activity G protein-coupled receptor activity G protein-coupled peptide receptor activity binding tetrapyrrole binding heme binding electron transfer activity cation binding transition metal ion binding iron ion binding ion binding metal ion binding small molecule binding peptide receptor activity molecular transducer activity G protein-coupled receptor activity G protein-coupled peptide receptor activity signaling receptor activity transmembrane signaling receptor activity apelin receptor activity mechanoreceptor activity	electron transport chain metabolic process cellular process generation of precursor metabolites and energy cellular response to stimulus regulation of biological process regulation of cellular process response to stimulus signaling biological regulation cell communication apelin receptor signaling pathway G protein-coupled receptor signaling pathway signal transduction electron transport chain metabolic process cellular process generation of precursor metabolites and energy cellular response to stimulus regulation of biological process regulation of cellular process response to stimulus signaling biological regulation cell communication apelin receptor signaling pathway G protein-coupled receptor signaling pathway signal transduction developmental process heart development multicellular organism development multicellular organismal process anatomical structure development animal organ development animal gross anatomical part developmental process circulatory system development system development atrioventricular valve development heart valve development cardiac chamber morphogenesis heart morphogenesis ventricular septum development anatomical structure morphogenesis cardiac septum development cardiac septum morphogenesis ventricular septum morphogenesis cardiac chamber development animal organ morphogenesis cardiac ventricle development regulation of body fluid levels regulation of biological quality regulation of blood vessel endothelial cell proliferation involved in sprouting angiogenesis positive regulation of cell population proliferation endothelial cell proliferation positive regulation of biological process angiogenesis tube morphogenesis positive regulation of endothelial cell proliferation epithelial cell proliferation positive regulation of cellular process blood vessel development positive regulation of blood vessel endothelial cell proliferation involved in sprouting angiogenesis cell population proliferation blood vessel morphogenesis tube development blood vessel endothelial cell proliferation involved in sprouting angiogenesis positive regulation of epithelial cell proliferation sprouting angiogenesis vasculature development regulation of endothelial cell proliferation regulation of cell population proliferation anatomical structure formation involved in morphogenesis regulation of epithelial cell proliferation regulation of biosynthetic process regulation of macromolecule metabolic process gene expression macromolecule biosynthetic process regulation of gene expression biosynthetic process regulation of macromolecule biosynthetic process macromolecule metabolic process regulation of metabolic process mesenchyme morphogenesis endocardial cushion morphogenesis mesenchyme development tissue development endocardial cushion formation tissue morphogenesis endocardial cushion development artery development aorta development regulation of localization negative adaptation of signaling pathway regulation of G protein-coupled receptor internalization receptor internalization negative regulation of biological process regulation of signal transduction regulation of receptor internalization vesicle-mediated transport negative regulation of G protein-coupled receptor signaling pathway localization positive regulation of endocytosis regulation of G protein-coupled receptor signaling pathway positive regulation of receptor-mediated endocytosis positive regulation of G protein-coupled receptor internalization establishment of localization positive regulation of receptor internalization regulation of response to stimulus adaptation of signaling pathway receptor-mediated endocytosis import into cell regulation of cellular component organization positive regulation of cellular component organization transport negative regulation of signaling desensitization of G protein-coupled receptor signaling pathway negative regulation of cell communication cellular component organization negative regulation of cellular process cellular component organization or biogenesis regulation of endocytosis G protein-coupled receptor internalization regulation of signaling regulation of transport negative regulation of response to stimulus regulation of receptor-mediated endocytosis regulation of vesicle-mediated transport negative regulation of signal transduction positive regulation of transport regulation of cell communication endocytosis cellular developmental process vasculogenesis cell differentiation regulation of developmental process regulation of vasculature development positive regulation of developmental process regulation of multicellular organismal process regulation of anatomical structure morphogenesis regulation of multicellular organismal development positive regulation of angiogenesis positive regulation of vasculature development regulation of angiogenesis positive regulation of multicellular organismal process adenylate cyclase-inhibiting G protein-coupled receptor signaling pathway adenylate cyclase-modulating G protein-coupled receptor signaling pathway venous blood vessel development regulation of calcium ion transport positive regulation of cation transmembrane transport positive regulation of calcium ion transport monoatomic ion transmembrane transport regulation of monoatomic ion transmembrane transport calcium ion transport metal ion transport regulation of calcium ion transmembrane transport monoatomic cation transmembrane transport positive regulation of monoatomic ion transport positive regulation of calcium ion transmembrane transport positive regulation of transmembrane transport monoatomic ion transport positive regulation of monoatomic ion transmembrane transport positive regulation of release of sequestered calcium ion into cytosol monoatomic cation transport regulation of metal ion transport calcium ion transmembrane import into cytosol regulation of release of sequestered calcium ion into cytosol regulation of monoatomic ion transport transmembrane transport release of sequestered calcium ion into cytosol regulation of transmembrane transport regulation of monoatomic cation transmembrane transport calcium ion transmembrane transport negative regulation of muscle adaptation system process striated muscle adaptation negative regulation of muscle hypertrophy regulation of system process regulation of muscle hypertrophy regulation of cardiac muscle hypertrophy in response to stress muscle adaptation cardiac muscle adaptation regulation of response to stress response to stress cardiac muscle hypertrophy cardiac muscle hypertrophy in response to stress muscle hypertrophy regulation of muscle adaptation negative regulation of cardiac muscle hypertrophy in response to stress striated muscle hypertrophy regulation of muscle system process muscle system process regulation of cardiac muscle hypertrophy negative regulation of cardiac muscle adaptation negative regulation of multicellular organismal process regulation of cardiac muscle adaptation negative regulation of cardiac muscle hypertrophy muscle hypertrophy in response to stress adult heart development negative regulation of metabolic process negative regulation of gene expression negative regulation of biosynthetic process negative regulation of macromolecule biosynthetic process negative regulation of macromolecule metabolic process positive regulation of cardiac muscle hypertrophy positive regulation of cardiac muscle hypertrophy in response to stress positive regulation of response to stimulus positive regulation of muscle adaptation positive regulation of cardiac muscle adaptation positive regulation of muscle hypertrophy smooth muscle cell differentiation muscle cell differentiation muscle structure development vascular associated smooth muscle cell differentiation coronary vasculature development gap junction assembly regulation of gap junction assembly regulation of cellular component biogenesis cellular component biogenesis regulation of cell junction assembly cell junction organization cellular component assembly cell junction assembly cell-cell junction assembly cell-cell junction organization pattern specification process embryo development embryonic heart tube development embryonic heart tube morphogenesis heart looping determination of bilateral symmetry epithelial tube morphogenesis embryonic organ development determination of left/right symmetry specification of symmetry embryonic organ morphogenesis epithelium development embryonic morphogenesis morphogenesis of an epithelium determination of heart left/right asymmetry regionalization left/right pattern formation	cellular anatomical structure extracellular region periplasmic space cell periphery plasma membrane membrane
A, B	agonistic antibody	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
C, D	IPR010980	Cytochrome c/b562	Homologous Superfamily
C, D	IPR009155	Cytochrome b562	Family
C, D	IPR000276	G protein-coupled receptor, rhodopsin-like	Family
C, D	IPR003904	Apelin receptor	Family
C, D	IPR017452	GPCR, rhodopsin-like, 7TM	Domain
C, D	IPR050119	C-C chemokine receptor type 1-9-like	Family

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
C, D	: P35414	interstitial cystitis malignant glioma Pick disease malignant colon neoplasm medulloblastoma pilocytic astrocytoma malignant ependymoma ovarian cancer

Membrane Protein Annotation: PDBTM PDBTM Database Homepage

Chains	External Link	Comment
C, D	PDBTM	Annotated as membrane protein by PDBTM

Membrane Protein Annotation: mpstruc mpstruc Database Homepage

Chains	Resource Link	Group	Subgroup	Protein
C, D	mpstruc	TRANSMEMBRANE PROTEINS: ALPHA-HELICAL	G Protein-Coupled Receptors: Class A	Apelin receptor (angiotensin II protein J receptor [APJR]), dimeric form