Annotations: 8XUM

Structure of LGR4 with RSPO2

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: MemProtMD

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
C [auth B]	WD40	e8xumB1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: WD40	ECOD (v294.2)
B [auth A]	WD40	e8xumA1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: WD40	ECOD (v294.2)
A [auth C]	WD40	e8xumC1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: WD40	ECOD (v294.2)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
A [auth C]	Heavy Chain	IGHV1	-	leucine-rich repeat-containing g-protein coupled receptor4	SAbDab (2026-06-12)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
C [auth B]	PF15913	Furin-like repeat, cysteine-rich (Furin-like_2)	Furin-like repeat, cysteine-rich	The furin-like cysteine rich region has been found in a variety of proteins from eukaryotes that are involved in the mechanism of signal transduction by receptor tyrosine kinases, which involves receptor aggregation.	Domain
B [auth A]	PF13855	Leucine rich repeat (LRR_8)	Leucine rich repeat	-	Repeat
B [auth A]	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 [auth B]	R-spondin-2	protein binding binding BMP receptor binding receptor serine/threonine kinase binding signaling receptor binding transmembrane receptor protein serine/threonine kinase binding heparin binding glycosaminoglycan binding carbohydrate derivative binding sulfur compound binding	developmental process multicellular organism development multicellular organismal process limb development appendage development anatomical structure development 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 developmental process multicellular organism development multicellular organismal process limb development appendage development anatomical structure development 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 cell communication positive regulation of response to stimulus positive regulation of Wnt signaling pathway signal transduction Wnt signaling pathway positive regulation of cellular process regulation of biological process regulation of signaling cell surface receptor signaling pathway regulation of Wnt signaling pathway biological regulation regulation of response to stimulus regulation of cell communication cellular process positive regulation of signaling regulation of canonical Wnt signaling pathway canonical Wnt signaling pathway positive regulation of canonical Wnt signaling pathway	cellular anatomical structure extracellular region cell surface
B [auth A]	Leucine-rich repeat-containing G-protein coupled receptor 4	molecular transducer activity G protein-coupled receptor activity transmembrane signaling receptor activity signaling receptor activity protein-hormone receptor activity	multicellular organismal process tissue remodeling bone remodeling developmental process cellular developmental process ossification cell differentiation cellular process osteoblast differentiation cellular response to stimulus positive regulation of response to biotic stimulus regulation of cellular process pattern recognition receptor signaling pathway response to stimulus multicellular organismal process tissue remodeling bone remodeling developmental process cellular developmental process ossification cell differentiation cellular process osteoblast differentiation cellular response to stimulus positive regulation of response to biotic stimulus regulation of cellular process pattern recognition receptor signaling pathway response to stimulus toll-like receptor signaling pathway negative regulation of biological process regulation of signal transduction response to biotic stimulus cell communication immune response-activating signaling pathway positive regulation of immune response regulation of immune system process signal transduction positive regulation of immune system process innate immune response-activating signaling pathway regulation of biological process immune response response to other organism regulation of innate immune response response to external stimulus regulation of response to stimulus defense response to other organism regulation of pattern recognition receptor signaling pathway positive regulation of defense response activation of innate immune response regulation of immune response regulation of toll-like receptor signaling pathway activation of immune response regulation of defense response regulation of response to biotic stimulus biological process involved in interspecies interaction between organisms regulation of response to external stimulus signaling negative regulation of signaling positive regulation of biological process negative regulation of cell communication positive regulation of response to stimulus positive regulation of response to external stimulus immune response-regulating signaling pathway regulation of response to stress response to stress innate immune response negative regulation of cellular process response to external biotic stimulus regulation of signaling positive regulation of innate immune response defense response negative regulation of response to stimulus biological regulation defense response to symbiont negative regulation of signal transduction negative regulation of toll-like receptor signaling pathway negative regulation of immune system process immune system process regulation of cell communication spermatogenesis sexual reproduction reproductive process multicellular organismal reproductive process developmental process involved in reproduction male gamete generation gamete generation bone mineralization animal organ development anatomical structure development biomineral tissue development tissue development mesonephric epithelium development kidney epithelium development branching morphogenesis of an epithelial tube nephron tubule morphogenesis regulation of kidney development regulation of branching involved in ureteric bud morphogenesis positive regulation of developmental process multicellular organism development tube morphogenesis animal organ morphogenesis nephron development system development regulation of morphogenesis of a branching structure epithelium development regulation of animal organ morphogenesis positive regulation of multicellular organismal process mesonephric tubule development renal tubule morphogenesis regulation of developmental process nephron morphogenesis nephron epithelium morphogenesis nephron tubule development renal system development ureteric bud morphogenesis positive regulation of morphogenesis of an epithelium branching involved in ureteric bud morphogenesis renal tubule development regulation of morphogenesis of an epithelium regulation of multicellular organismal process epithelial tube morphogenesis regulation of anatomical structure morphogenesis nephron epithelium development ureteric bud development tube development mesonephros development morphogenesis of an epithelium tissue morphogenesis anatomical structure morphogenesis kidney morphogenesis morphogenesis of a branching structure positive regulation of branching involved in ureteric bud morphogenesis mesonephric tubule morphogenesis kidney development morphogenesis of a branching epithelium regulation of biosynthetic process rhythmic process circadian regulation of gene expression circadian rhythm regulation of macromolecule metabolic process gene expression macromolecule biosynthetic process regulation of gene expression biosynthetic process regulation of macromolecule biosynthetic process metabolic process macromolecule metabolic process regulation of metabolic process cytokine production regulation of cytokine production negative regulation of macromolecule metabolic process negative regulation of metabolic process negative regulation of cytokine production negative regulation of gene expression negative regulation of biosynthetic process negative regulation of macromolecule biosynthetic process negative regulation of multicellular organismal process metanephric tubule morphogenesis metanephric epithelium development metanephros development metanephros morphogenesis metanephric nephron tubule morphogenesis metanephric nephron development metanephric nephron epithelium development metanephric nephron tubule development metanephric nephron morphogenesis metanephric tubule development cell surface receptor signaling pathway Wnt signaling pathway positive regulation of cell communication positive regulation of signal transduction regulation of canonical Wnt signaling pathway canonical Wnt signaling pathway positive regulation of Wnt signaling pathway positive regulation of cellular process positive regulation of canonical Wnt signaling pathway regulation of Wnt signaling pathway positive regulation of signaling negative regulation of cold-induced thermogenesis homeostatic process adaptive thermogenesis multicellular organismal-level homeostasis regulation of cold-induced thermogenesis cold-induced thermogenesis temperature homeostasis metanephric glomerulus development glomerulus development	cell periphery cellular anatomical structure plasma membrane membrane
A [auth C]	MB52	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
C [auth B]	IPR000884	Thrombospondin type-1 (TSP1) repeat	Repeat
C [auth B]	IPR043601	R-spondin, Fu-CRD domain	Domain
C [auth B]	IPR036383	Thrombospondin type-1 repeat superfamily	Homologous Superfamily
C [auth B]	IPR051514	R-spondin domain-containing protein	Family
C [auth B]	IPR006212	Furin-like repeat	Repeat
C [auth B]	IPR009030	Growth factor receptor cysteine-rich domain superfamily	Homologous Superfamily
B [auth A]	IPR000372	Leucine-rich repeat N-terminal domain	Domain
B [auth A]	IPR003591	Leucine-rich repeat, typical subtype	Repeat
B [auth A]	IPR000276	G protein-coupled receptor, rhodopsin-like	Family
B [auth A]	IPR002131	Glycoprotein hormone receptor family	Family
B [auth A]	IPR017452	GPCR, rhodopsin-like, 7TM	Domain
B [auth A]	IPR001611	Leucine-rich repeat	Repeat
B [auth A]	IPR032675	Leucine-rich repeat domain superfamily	Homologous Superfamily

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
C [auth B]	: Q6UXX9	androgenetic alopecia humerofemoral hypoplasia with radiotibial ray deficiency malignant ependymoma oligodendroglioma pilocytic astrocytoma astrocytic tumor large cell medulloblastoma malignant glioma ossification of the posterior longitudinal ligament of the spine primitive neuroectodermal tumor glioblastoma lung adenocarcinoma medulloblastoma Pick disease tetraamelia syndrome 2
B [auth A]	: Q9BXB1	BONE MINERAL DENSITY QUANTITATIVE TRAIT LOCUS 17 adenoma glioblastoma lung adenocarcinoma malignant glioma obesity disorder psoriasis adrenal cortex carcinoma breast cancer interstitial cystitis lung cancer malignant mesothelioma osteoporosis spina bifida atypical teratoid rhabdoid tumor BONE MINERAL DENSITY QUANTITATIVE TRAIT LOCUS 17 adenoma glioblastoma lung adenocarcinoma malignant glioma obesity disorder psoriasis adrenal cortex carcinoma breast cancer interstitial cystitis lung cancer malignant mesothelioma osteoporosis spina bifida atypical teratoid rhabdoid tumor breast carcinoma large cell medulloblastoma lung carcinoma non-small cell lung carcinoma osteosarcoma

Membrane Protein Annotation: PDBTM PDBTM Database Homepage

Chains	External Link	Comment
B [auth A], C [auth B]	PDBTM	Annotated as membrane protein by PDBTM

Membrane Protein Annotation: MemProtMD MemProtMD Database Homepage

Chains	External Link	Comment
B [auth A], C [auth B]	MemProtMD	Annotated as membrane protein by MemProtMD

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