Annotations: 4X9B

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	F_UNCLASSIFIED	e4x9bA4	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: F_UNCLASSIFIED	ECOD (1.6)
A	PF07679	e4x9bA2	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: PF07679	ECOD (1.6)
A	PF13927	e4x9bA1	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: PF13927	ECOD (1.6)
B	F_UNCLASSIFIED	e4x9bB3	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: F_UNCLASSIFIED	ECOD (1.6)
B	PF07679	e4x9bB4	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: PF07679	ECOD (1.6)
B	PF13927	e4x9bB1	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: PF13927	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
B	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF13927	Immunoglobulin domain (Ig_3)	Immunoglobulin domain	This family contains immunoglobulin-like domains.	Domain
A, B	PF07679	Immunoglobulin I-set domain (I-set)	Immunoglobulin I-set domain	-	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	Down syndrome cell adhesion molecule, isoform 4.44	molecular transducer activity transmembrane signaling receptor activity signaling receptor activity axon guidance receptor activity binding antigen binding cell adhesion molecule binding protein binding cell adhesion mediator activity cell-cell adhesion mediator activity identical protein binding protein homodimerization activity protein dimerization activity	developmental process multicellular organismal process head development mushroom body development animal organ development brain development nervous system development multicellular organism development central nervous system development anatomical structure development system development regulation of neuron projection development axonogenesis regulation of cellular component organization developmental process multicellular organismal process head development mushroom body development animal organ development brain development nervous system development multicellular organism development central nervous system development anatomical structure development system development regulation of neuron projection development axonogenesis regulation of cellular component organization regulation of cellular process cellular developmental process regulation of developmental process cell projection organization plasma membrane bounded cell projection morphogenesis cell development neuron projection development cell morphogenesis cellular component organization neurogenesis cell projection morphogenesis neuron differentiation neuron projection morphogenesis regulation of axonogenesis cell differentiation cellular component organization or biogenesis regulation of anatomical structure morphogenesis regulation of biological process plasma membrane bounded cell projection organization regulation of cell projection organization biological regulation axon development cell morphogenesis involved in neuron differentiation generation of neurons anatomical structure morphogenesis neuron development cellular process regulation of plasma membrane bounded cell projection organization localization import into cell transport phagocytosis endocytosis establishment of localization vesicle-mediated transport axon extension developmental growth cell growth axon extension involved in axon guidance neuron projection extension involved in neuron projection guidance neuron projection extension developmental cell growth growth axon guidance developmental growth involved in morphogenesis neuron projection guidance neuron recognition dendrite self-avoidance cell recognition detection of external stimulus system process nervous system process response to stimulus response to mechanical stimulus detection of mechanical stimulus involved in sensory perception of touch response to external stimulus sensory perception of touch detection of mechanical stimulus involved in sensory perception sensory perception of mechanical stimulus detection of abiotic stimulus detection of stimulus sensory perception detection of mechanical stimulus response to abiotic stimulus detection of stimulus involved in sensory perception peripheral nervous system development central nervous system morphogenesis dendrite development regulation of dendrite morphogenesis dendrite morphogenesis regulation of dendrite development cell adhesion cell-cell adhesion cell-cell adhesion via plasma-membrane adhesion molecules homophilic cell adhesion via plasma membrane adhesion molecules neuron projection fasciculation axonal fasciculation ventral cord development response to organic substance biological process involved in interspecies interaction between organisms detection of external biotic stimulus response to other organism detection of molecule of bacterial origin detection of biotic stimulus response to biotic stimulus response to chemical response to bacterium detection of chemical stimulus response to external biotic stimulus response to molecule of bacterial origin	somatodendritic compartment cell body perikaryon neuronal cell body cellular anatomical entity cell periphery plasma membrane membrane cell projection dendrite dendritic tree neuron projection plasma membrane bounded cell projection extracellular region somatodendritic compartment cell body perikaryon neuronal cell body cellular anatomical entity cell periphery plasma membrane membrane cell projection dendrite dendritic tree neuron projection plasma membrane bounded cell projection extracellular region axon

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR036179	Immunoglobulin-like domain superfamily	Homologous Superfamily
A, B	IPR003599	Immunoglobulin subtype	Domain
A, B	IPR003598	Immunoglobulin subtype 2	Domain
A, B	IPR021012	Cell adhesion molecule Dscam1, C-terminal	Domain
A, B	IPR013098	Immunoglobulin I-set	Domain
A, B	IPR003961	Fibronectin type III	Domain
A, B	IPR013783	Immunoglobulin-like fold	Homologous Superfamily
A, B	IPR007110	Immunoglobulin-like domain	Domain
A, B	IPR036116	Fibronectin type III superfamily	Homologous Superfamily

RCSB PDB Core Operations are funded by the National Science Foundation (DBI-1832184), 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 R01GM133198.