Annotations: 8QW4

FZD3 in complex with nanobody 9

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
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)
B	Putative_PNPOx,PNP_phzG_C	e8qw4B01	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: Putative_PNPOx,PNP_phzG_C	ECOD (v294.2)
A	Putative_PNPOx,PNP_phzG_C	e8qw4A01	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: Putative_PNPOx,PNP_phzG_C	ECOD (v294.2)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
B	Heavy Chain	IGHV1	-	frizzled-3	SAbDab (2026-05-08)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF01534	Frizzled/Smoothened family membrane region (Frizzled)	Frizzled/Smoothened family membrane region	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
B	Nanobody Nb9	-	-	-
A	Frizzled-3	molecular transducer activity transmembrane signaling receptor activity signaling receptor activity Wnt receptor activity G protein-coupled receptor activity protein binding binding PDZ domain binding protein domain specific binding Wnt-protein binding	response to stimulus response to chemical response to xenobiotic stimulus cellular response to stimulus regulation of biological process regulation of cellular process cell surface receptor signaling pathway signaling canonical Wnt signaling pathway biological regulation cell communication cellular process signal transduction Wnt signaling pathway response to stimulus response to chemical response to xenobiotic stimulus cellular response to stimulus regulation of biological process regulation of cellular process cell surface receptor signaling pathway signaling canonical Wnt signaling pathway biological regulation cell communication cellular process signal transduction Wnt signaling pathway developmental process multicellular organismal process head development cell population proliferation animal organ development brain development nervous system development multicellular organism development central nervous system development cell proliferation in midbrain midbrain development anatomical structure development neural precursor cell proliferation system development ear morphogenesis embryonic organ morphogenesis ear development sensory organ development embryonic morphogenesis embryo development anatomical structure morphogenesis sensory organ morphogenesis inner ear development inner ear morphogenesis animal organ morphogenesis embryonic organ development non-canonical Wnt signaling pathway epithelium development epidermis development molting cycle process hair cycle tissue development skin development skin epidermis development hair follicle development molting cycle hair cycle process sympathetic nervous system development ganglion development autonomic nervous system development sympathetic ganglion development cellular developmental process generation of neurons neurogenesis neuron differentiation cell differentiation neuron migration motor neuron migration cell migration cell motility regulation of mitotic cell cycle, embryonic negative regulation of biological process negative regulation of cell cycle mitotic cell cycle negative regulation of mitotic cell cycle mitotic cell cycle, embryonic regulation of mitotic cell cycle negative regulation of cellular process negative regulation of mitotic cell cycle, embryonic cell cycle regulation of cell cycle commissural neuron axon guidance axonogenesis cell projection organization plasma membrane bounded cell projection morphogenesis cell development neuron projection development cell morphogenesis cellular component organization cell projection morphogenesis neuron projection morphogenesis cellular component organization or biogenesis plasma membrane bounded cell projection organization axon guidance axon development cell morphogenesis involved in neuron differentiation neuron projection guidance neuron development negative regulation of programmed cell death regulation of apoptotic process negative regulation of execution phase of apoptosis regulation of programmed cell death cell death regulation of execution phase of apoptosis execution phase of apoptosis negative regulation of apoptotic process apoptotic process programmed cell death post-anal tail morphogenesis response to electrical stimulus response to abiotic stimulus embryonic epithelial tube formation chordate embryonic development tube formation epithelial tube formation tube morphogenesis primary neural tube formation embryo development ending in birth or egg hatching epithelial tube morphogenesis morphogenesis of embryonic epithelium neural tube development tube development morphogenesis of an epithelium tissue morphogenesis neural tube closure neural tube formation anatomical structure formation involved in morphogenesis tube closure Wnt signaling pathway, planar cell polarity pathway dopaminergic neuron axon guidance serotonergic neuron axon guidance brain morphogenesis midbrain morphogenesis neuroblast proliferation positive regulation of nervous system development positive regulation of cell population proliferation regulation of developmental process positive regulation of biological process regulation of neuroblast proliferation regulation of cell differentiation regulation of neurogenesis regulation of cell development regulation of nervous system development positive regulation of developmental process positive regulation of cell differentiation positive regulation of neurogenesis regulation of multicellular organismal process positive regulation of cellular process regulation of neural precursor cell proliferation regulation of multicellular organismal development positive regulation of cell development positive regulation of neural precursor cell proliferation regulation of cell population proliferation positive regulation of multicellular organismal process positive regulation of neuroblast proliferation establishment of planar polarity establishment of tissue polarity morphogenesis of a polarized epithelium	cell periphery cellular anatomical structure apical part of cell membrane plasma membrane plasma membrane region apical plasma membrane cell surface filopodium tip cell projection actin-based cell projection filopodium plasma membrane bounded cell projection somatodendritic compartment cell periphery cellular anatomical structure apical part of cell membrane plasma membrane plasma membrane region apical plasma membrane cell surface filopodium tip cell projection actin-based cell projection filopodium plasma membrane bounded cell projection somatodendritic compartment dendrite dendritic tree neuron projection intracellular anatomical structure cytoplasm synapse cell junction glutamatergic synapse presynaptic active zone membrane presynaptic membrane synaptic membrane presynapse presynaptic active zone cell body neuronal cell body axon lateral plasma membrane

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR036790	Frizzled cysteine-rich domain superfamily	Homologous Superfamily
A	IPR041769	Frizzled 3, cysteine-rich domain	Domain
A	IPR017981	GPCR, family 2-like, 7TM	Domain
A	IPR015526	Frizzled/secreted frizzled-related protein	Family
A	IPR000539	Frizzled/Smoothened, 7TM	Domain
A	IPR020067	Frizzled domain	Domain

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A	: Q9NPG1	acute myeloid leukemia breast cancer intellectual disability lung carcinoma Nonorganic psychosis pituitary cancer atypical teratoid rhabdoid tumor Crohn disease interstitial cystitis malignant ependymoma osteosarcoma B-cell chronic lymphocytic leukemia ductal breast carcinoma in situ lung cancer pilocytic astrocytoma acute myeloid leukemia breast cancer intellectual disability lung carcinoma Nonorganic psychosis pituitary cancer atypical teratoid rhabdoid tumor Crohn disease interstitial cystitis malignant ependymoma osteosarcoma B-cell chronic lymphocytic leukemia ductal breast carcinoma in situ lung cancer pilocytic astrocytoma schizophrenia

Membrane Protein Annotation: PDBTM PDBTM Database Homepage

Chains	External Link	Comment
A	PDBTM	Annotated as membrane protein by PDBTM

Membrane Protein Annotation: MemProtMD MemProtMD Database Homepage

Chains	External Link	Comment
A	MemProtMD	Annotated as membrane protein by MemProtMD

Membrane Protein Annotation: mpstruc mpstruc Database Homepage

Chains	Resource Link	Group	Subgroup	Protein
A	mpstruc	TRANSMEMBRANE PROTEINS: ALPHA-HELICAL	G Protein-Coupled Receptors: Class F	Frizzled 3 (FZD3) receptor in complex with nanobody 9

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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.