Annotations: 4APX

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	Cadherin	e4apxA1	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: Cadherin	ECOD (1.6)
B	EUF07711	e4apxB2	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: EUF07711	ECOD (1.6)
B	Cadherin	e4apxB1	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: Cadherin	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	2.60.40.60	Mainly Beta	Sandwich	Immunoglobulin-like	Cadherins	CATH (4.3.0)
B	2.60.40.3430	Mainly Beta	Sandwich	Immunoglobulin-like		CATH (4.3.0)
B	2.60.40.60	Mainly Beta	Sandwich	Immunoglobulin-like	Cadherins	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF00028	Cadherin domain (Cadherin)	Cadherin domain		Domain
B	PF00028	Cadherin domain (Cadherin)	Cadherin domain		Domain
B	PF18432	Extracellular Cadherin domain (ECD)	Extracellular Cadherin domain	This is an extracellular cadherin (EC) domain which can be found at the N-terminal region of Protocadherin 15 (Pcdh15). Pcdh15 features exceptionally long extracellular domains containing 11 ECs [1]. These repeats are structurally similar, but not id ...	This is an extracellular cadherin (EC) domain which can be found at the N-terminal region of Protocadherin 15 (Pcdh15). Pcdh15 features exceptionally long extracellular domains containing 11 ECs [1]. These repeats are structurally similar, but not identical in sequence, often featuring linkers with conserved calcium-binding sites that confer mechanical strength to them [2].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	CADHERIN-23	cation binding ion binding binding calcium ion binding metal ion binding small molecule binding	developmental process ear development sensory organ development inner ear development cochlea development animal organ development anatomical structure development multicellular organismal process inner ear receptor cell development cell projection organization epidermis development auditory receptor cell stereocilium organization neuron projection development epithelial cell differentiation developmental process ear development sensory organ development inner ear development cochlea development animal organ development anatomical structure development multicellular organismal process inner ear receptor cell development cell projection organization epidermis development auditory receptor cell stereocilium organization neuron projection development epithelial cell differentiation hair cell differentiation multicellular organism development neuron differentiation cell differentiation animal organ morphogenesis system development embryonic organ morphogenesis mechanoreceptor differentiation epithelium development epidermal cell differentiation embryonic morphogenesis nervous system development tissue development inner ear receptor cell differentiation generation of neurons auditory receptor cell development cellular developmental process cell development embryo development cell morphogenesis cellular component organization neurogenesis cellular component organization or biogenesis auditory receptor cell morphogenesis embryonic organ development ear morphogenesis plasma membrane bounded cell projection organization inner ear auditory receptor cell differentiation cell morphogenesis involved in neuron differentiation anatomical structure morphogenesis sensory organ morphogenesis neuron development inner ear morphogenesis cellular process inner ear receptor cell stereocilium organization behavior locomotory behavior sensory perception of light stimulus system process sensory perception nervous system process inorganic ion homeostasis intracellular calcium ion homeostasis homeostatic process calcium ion homeostasis regulation of cytosolic calcium ion concentration cellular homeostasis chemical homeostasis intracellular monoatomic cation homeostasis monoatomic ion homeostasis intracellular chemical homeostasis monoatomic cation homeostasis intracellular monoatomic ion homeostasis multicellular organismal-level homeostasis anatomical structure homeostasis tissue homeostasis retina homeostasis photoreceptor cell maintenance neuromuscular process equilibrioception neuromuscular process controlling balance sensory perception of sound sensory perception of mechanical stimulus cell adhesion cell-cell adhesion cell-cell adhesion via plasma-membrane adhesion molecules homophilic cell adhesion via plasma membrane adhesion molecules localization transport monoatomic ion transport monoatomic cation transport establishment of localization calcium ion transport metal ion transport calcium-dependent cell-cell adhesion via plasma membrane cell adhesion molecules	cellular anatomical structure photoreceptor inner segment cell projection stereocilium actin-based cell projection organelle stereocilium tip stereocilium bundle neuron projection cluster of actin-based cell projections plasma membrane bounded cell projection intracellular organelle centrosome microtubule organizing center cellular anatomical structure photoreceptor inner segment cell projection stereocilium actin-based cell projection organelle stereocilium tip stereocilium bundle neuron projection cluster of actin-based cell projections plasma membrane bounded cell projection intracellular organelle centrosome microtubule organizing center intracellular anatomical structure cytoskeleton membraneless organelle intracellular membraneless organelle microtubule cytoskeleton cell periphery plasma membrane membrane membrane-bounded organelle 9+2 non-motile cilium non-motile cilium cilium kinocilium photoreceptor ribbon synapse synapse cell junction ribbon synapse cochlear hair cell ribbon synapse
B	PROTOCADHERIN-15	cation binding ion binding binding calcium ion binding metal ion binding small molecule binding	multicellular organismal process inner ear receptor cell development cell projection organization sensory organ development epidermis development auditory receptor cell stereocilium organization neuron projection development epithelial cell differentiation hair cell differentiation multicellular organism development neuron differentiation cell differentiation inner ear development anatomical structure development multicellular organismal process inner ear receptor cell development cell projection organization sensory organ development epidermis development auditory receptor cell stereocilium organization neuron projection development epithelial cell differentiation hair cell differentiation multicellular organism development neuron differentiation cell differentiation inner ear development anatomical structure development animal organ morphogenesis system development developmental process embryonic organ morphogenesis mechanoreceptor differentiation epithelium development epidermal cell differentiation ear development embryonic morphogenesis nervous system development tissue development inner ear receptor cell differentiation generation of neurons auditory receptor cell development cellular developmental process cell development embryo development cell morphogenesis cellular component organization neurogenesis cellular component organization or biogenesis auditory receptor cell morphogenesis embryonic organ development ear morphogenesis plasma membrane bounded cell projection organization animal organ development inner ear auditory receptor cell differentiation cell morphogenesis involved in neuron differentiation anatomical structure morphogenesis sensory organ morphogenesis neuron development inner ear morphogenesis cellular process inner ear receptor cell stereocilium organization behavior locomotory behavior response to stimulus response to metal ion response to chemical response to calcium ion tissue morphogenesis morphogenesis of an epithelium reflex response to external stimulus righting reflex organelle assembly plasma membrane bounded cell projection assembly cellular component biogenesis organelle organization cellular component assembly cilium assembly non-motile cilium assembly cilium organization cell projection assembly startle response system process nervous system process neuromuscular process detection of external stimulus detection of mechanical stimulus involved in sensory perception of sound response to mechanical stimulus 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 sensory perception of sound sensory perception of light stimulus visual perception detection of mechanical stimulus involved in equilibrioception equilibrioception neuromuscular process controlling balance cell adhesion cell-cell adhesion cell-cell adhesion via plasma-membrane adhesion molecules homophilic cell adhesion via plasma membrane adhesion molecules adult walking behavior adult locomotory behavior adult behavior walking behavior multicellular organism growth developmental growth growth actin cytoskeleton organization actin filament organization actin filament-based process supramolecular fiber organization cytoskeleton organization actin filament bundle organization actin filament bundle assembly	cellular anatomical structure membrane cell periphery plasma membrane intracellular anatomical structure cytoplasm membrane-bounded organelle non-motile cilium 9+0 non-motile cilium cilium neuron projection photoreceptor outer segment plasma membrane bounded cell projection cell projection cellular anatomical structure membrane cell periphery plasma membrane intracellular anatomical structure cytoplasm membrane-bounded organelle non-motile cilium 9+0 non-motile cilium cilium neuron projection photoreceptor outer segment plasma membrane bounded cell projection cell projection photoreceptor cell cilium organelle extracellular region stereocilium actin-based cell projection stereocilium bundle cluster of actin-based cell projections

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR015919	Cadherin-like superfamily	Homologous Superfamily
A	IPR020894	Cadherin conserved site	Conserved Site
A	IPR002126	Cadherin-like	Domain
B	IPR015919	Cadherin-like superfamily	Homologous Superfamily
B	IPR056989	Protocadherin-15 domain	Domain
B	IPR020894	Cadherin conserved site	Conserved Site
B	IPR030718	Extracellular cadherin domain superfamily	Homologous Superfamily
B	IPR050971	Cadherin domain-containing protein	Family
B	IPR041149	Extracellular cadherin domain	Domain
B	IPR002126	Cadherin-like	Domain

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.