Annotations: 9HQ5

Crystal structure of Tetraspanin CD63mutant Large Extracellular Loop (LEL) in complex with sybody SB3

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

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
B	PAD_N	e9hq5B1	A: alpha arrays	X: Hypothetical protein YqbG-like	H: Hypothetical protein YqbG-like	T: alpha/beta-Hydrolases	F: PAD_N	ECOD (v295.2)
A	Pkinase	e9hq5A1	A: alpha arrays	X: Hypothetical protein YqbG-like	H: Hypothetical protein YqbG-like	T: alpha/beta-Hydrolases	F: Pkinase	ECOD (v295.2)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
B	Heavy Chain	IGHV1	-	cd63 antigen	SAbDab (2026-08-21)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF00335	Tetraspanin family (Tetraspanin)	Tetraspanin family	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
B	Sybody SB3	-	-	-
A	CD63 antigen	protein-containing complex binding binding	cell adhesion cell-matrix adhesion cell-substrate adhesion cellular process cellular response to stimulus regulation of cellular process cellular response to growth factor stimulus response to stimulus signaling regulation of signal transduction cell surface receptor protein tyrosine kinase signaling pathway cell communication cellular response to endogenous stimulus signal transduction cell adhesion cell-matrix adhesion cell-substrate adhesion cellular process cellular response to stimulus regulation of cellular process cellular response to growth factor stimulus response to stimulus signaling regulation of signal transduction cell surface receptor protein tyrosine kinase signaling pathway cell communication cellular response to endogenous stimulus signal transduction regulation of vascular endothelial growth factor signaling pathway enzyme-linked receptor protein signaling pathway regulation of biological process regulation of signaling regulation of cellular response to vascular endothelial growth factor stimulus cell surface receptor signaling pathway response to endogenous stimulus regulation of cellular response to growth factor stimulus biological regulation vascular endothelial growth factor signaling pathway regulation of response to stimulus regulation of cell communication cellular response to vascular endothelial growth factor stimulus response to growth factor localization establishment of protein localization protein transport transport macromolecule localization intracellular protein localization establishment of localization regulation of localization import into cell regulation of cellular component organization positive regulation of cellular component organization receptor internalization positive regulation of biological process regulation of receptor internalization vesicle-mediated transport cellular component organization positive regulation of endocytosis cellular component organization or biogenesis positive regulation of receptor-mediated endocytosis positive regulation of cellular process regulation of endocytosis regulation of transport regulation of receptor-mediated endocytosis regulation of vesicle-mediated transport positive regulation of receptor internalization positive regulation of transport endocytosis receptor-mediated endocytosis developmental process epithelium development cellular developmental process cell differentiation anatomical structure development tissue development epithelial cell differentiation animal gross anatomical part developmental process cell migration cell motility cellular localization pigment cell differentiation developmental pigmentation cellular pigmentation endosome to pigment granule transport pigmentation establishment of localization in cell cellular pigment accumulation endosome to melanosome transport pigment accumulation intracellular transport response to external stimulus developmental maturation pigment granule maturation positive regulation of cell adhesion regulation of cell adhesion positive regulation of cell communication regulation of integrin-mediated signaling pathway positive regulation of signal transduction positive regulation of response to stimulus positive regulation of integrin-mediated signaling pathway integrin-mediated signaling pathway positive regulation of signaling multicellular organismal process negative regulation of locomotion regulation of cell motility negative regulation of biological process tissue migration negative regulation of epithelial cell migration ameboidal-type cell migration regulation of cell migration negative regulation of cellular process regulation of multicellular organismal process epithelial cell migration regulation of epithelial cell migration locomotion negative regulation of cell migration epithelium migration regulation of locomotion negative regulation of cell motility negative regulation of multicellular organismal process regulation of potassium ion transport monoatomic ion transmembrane transport potassium ion transmembrane transport regulation of monoatomic ion transmembrane transport metal ion transport monoatomic cation transmembrane transport monoatomic ion transport monoatomic cation transport regulation of metal ion transport regulation of monoatomic ion transport regulation of potassium ion transmembrane transport transmembrane transport regulation of transmembrane transport potassium ion transport regulation of monoatomic cation transmembrane transport	multivesicular body, internal vesicle membrane-bounded organelle intracellular anatomical structure endosome intracellular vesicle endosomal intralumenal vesicle intracellular membrane-bounded organelle endomembrane system intracellular organelle cellular anatomical structure cytoplasmic vesicle organelle late endosome cytoplasm multivesicular body, internal vesicle membrane-bounded organelle intracellular anatomical structure endosome intracellular vesicle endosomal intralumenal vesicle intracellular membrane-bounded organelle endomembrane system intracellular organelle cellular anatomical structure cytoplasmic vesicle organelle late endosome cytoplasm vesicle multivesicular body pigment granule melanosome endosome membrane membrane multivesicular body membrane late endosome membrane cytoplasmic vesicle membrane bounding membrane of organelle vesicle membrane organelle membrane extracellular exosome extracellular vesicle extracellular organelle extracellular region extracellular membrane-bounded organelle lytic vacuole lysosome vacuolar membrane azurophil granule vacuole lytic vacuole membrane lysosomal membrane secretory granule primary lysosome secretory vesicle azurophil granule membrane secretory granule membrane cell surface platelet dense granule membrane platelet dense granule cell periphery plasma membrane protein-containing complex membrane-enclosed lumen intracellular organelle lumen organelle lumen endosome lumen

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR008952	Tetraspanin, EC2 domain superfamily	Homologous Superfamily
A	IPR000301	Tetraspanin, animals	Family
A	IPR018503	Tetraspanin, conserved site	Conserved Site
A	IPR018499	Tetraspanin/Peripherin	Family
A	IPR042028	CD63, extracellular domain	Domain

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A	: P08962	Liver Cirrhosis, Experimental age-related macular degeneration cancer glioblastoma malignant glioma pilocytic astrocytoma atrial fibrillation diabetes mellitus MALT lymphoma subependymal giant cell astrocytoma atypical teratoid rhabdoid tumor malignant ependymoma ovarian cancer wet macular degeneration

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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.