Annotations: 6RLR

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
B	1.10.1450.10	Mainly Alpha	Orthogonal Bundle	Cd81 Antigen, Extracellular Domain	Chain: A	CATH (utative)
C	1.10.1450.10	Mainly Alpha	Orthogonal Bundle	Cd81 Antigen, Extracellular Domain	Chain: A	CATH (utative)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B, C, D	PF00335	Tetraspanin family (Tetraspanin)	Tetraspanin family	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B, C, D	CD9 antigen	cell adhesion molecule binding protein-containing complex binding protein binding binding integrin binding signaling receptor binding	sperm-egg recognition sexual reproduction cell-cell recognition reproductive process fertilization cell recognition cellular process single fertilization developmental process tissue regeneration skeletal muscle tissue regeneration cellular developmental process developmental growth myoblast fusion sperm-egg recognition sexual reproduction cell-cell recognition reproductive process fertilization cell recognition cellular process single fertilization developmental process tissue regeneration skeletal muscle tissue regeneration cellular developmental process developmental growth myoblast fusion growth cell-cell fusion myotube differentiation involved in skeletal muscle regeneration muscle cell differentiation regeneration myotube differentiation muscle structure development syncytium formation by plasma membrane fusion anatomical structure morphogenesis cell differentiation myoblast fusion involved in skeletal muscle regeneration anatomical structure development anatomical structure formation involved in morphogenesis striated muscle cell differentiation syncytium formation localization import into cell receptor internalization transport receptor-mediated endocytosis endocytosis establishment of localization vesicle-mediated transport cell population proliferation multicellular organismal process regulation of body fluid levels regulation of cellular process response to stimulus negative regulation of biological process regulation of cell activation negative regulation of cell adhesion negative regulation of platelet activation regulation of coagulation regulation of biological quality response to wounding regulation of biological process negative regulation of homotypic cell-cell adhesion negative regulation of wound healing negative regulation of blood coagulation response to external stimulus blood coagulation negative regulation of hemostasis regulation of platelet activation regulation of response to stimulus negative regulation of response to external stimulus negative regulation of cell-cell adhesion regulation of wound healing negative regulation of multicellular organismal process platelet activation regulation of response to external stimulus homotypic cell-cell adhesion regulation of response to wounding cell adhesion cell-cell adhesion response to stress regulation of response to stress negative regulation of cellular process coagulation regulation of cell-cell adhesion regulation of multicellular organismal process regulation of hemostasis wound healing negative regulation of response to stimulus regulation of homotypic cell-cell adhesion regulation of cell adhesion regulation of blood coagulation biological regulation hemostasis cell activation negative regulation of platelet aggregation negative regulation of response to wounding platelet aggregation negative regulation of cell activation regulation of platelet aggregation negative regulation of coagulation regulation of cell motility regulation of leukocyte migration macrophage migration leukocyte migration regulation of macrophage migration immune system process regulation of locomotion mononuclear cell migration regulation of cell migration myeloid leukocyte migration cell migration regulation of immune system process regulation of mononuclear cell migration cell motility locomotion membrane organization membrane fusion plasma membrane fusion multicellular organismal reproductive process cellular process involved in reproduction in multicellular organism cellular component organization fusion of sperm to egg plasma membrane involved in single fertilization plasma membrane organization cellular component organization or biogenesis endomembrane system organization oligodendrocyte development cell development nervous system development glial cell development multicellular organism development neurogenesis central nervous system development gliogenesis oligodendrocyte differentiation glial cell differentiation system development negative regulation of cell population proliferation regulation of cell population proliferation cellular response to stimulus cellular response to low-density lipoprotein particle stimulus response to endogenous stimulus response to chemical response to lipoprotein particle cellular response to lipoprotein particle stimulus glial cell migration cellular component assembly involved in morphogenesis myelin assembly cellular component biogenesis cellular anatomical entity morphogenesis cellular component assembly cell junction assembly axon ensheathment ensheathment of neurons cell-cell junction assembly cell-cell junction organization myelination cell junction organization paranodal junction assembly	cellular anatomical structure anchoring junction cell junction focal adhesion cell-substrate junction cell periphery cell surface membrane plasma membrane external side of plasma membrane side of membrane apical part of cell plasma membrane region apical plasma membrane cellular anatomical structure anchoring junction cell junction focal adhesion cell-substrate junction cell periphery cell surface membrane plasma membrane external side of plasma membrane side of membrane apical part of cell plasma membrane region apical plasma membrane membrane-bounded organelle intracellular anatomical structure intracellular vesicle intracellular organelle bounding membrane of organelle cytoplasmic vesicle vesicle membrane clathrin-coated vesicle endocytic vesicle membrane coated vesicle vesicle endocytic vesicle clathrin-coated vesicle membrane clathrin-coated endocytic vesicle membrane intracellular membrane-bounded organelle clathrin-coated endocytic vesicle cytoplasmic vesicle membrane coated vesicle membrane organelle cytoplasm organelle membrane extracellular exosome extracellular vesicle extracellular organelle extracellular region extracellular space extracellular membrane-bounded organelle protein-containing complex platelet alpha granule membrane endomembrane system secretory granule secretory vesicle platelet alpha granule secretory granule membrane

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B, C, D	IPR042055	CD9, extracellular domain	Domain
A, B, C, D	IPR008952	Tetraspanin, EC2 domain superfamily	Homologous Superfamily
A, B, C, D	IPR000301	Tetraspanin, animals	Family
A, B, C, D	IPR018503	Tetraspanin, conserved site	Conserved Site
A, B, C, D	IPR018499	Tetraspanin/Peripherin	Family

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A, B, C, D	Pharos: P21926	glioblastoma acute myeloid leukemia colorectal cancer giant cell glioblastoma Nerve Degeneration non-small cell lung carcinoma germ cell tumor cirrhosis of liver embryonal neoplasm prostate cancer facioscapulohumeral muscular dystrophy tuberculosis invasive ductal breast carcinoma limb-girdle muscular dystrophy ankylosing spondylitis glioblastoma acute myeloid leukemia colorectal cancer giant cell glioblastoma Nerve Degeneration non-small cell lung carcinoma germ cell tumor cirrhosis of liver embryonal neoplasm prostate cancer facioscapulohumeral muscular dystrophy tuberculosis invasive ductal breast carcinoma limb-girdle muscular dystrophy ankylosing spondylitis malignant glioma medulloblastoma colorectal adenoma ovarian cancer Duchenne muscular dystrophy primary biliary cholangitis Emery-Dreifuss muscular dystrophy juvenile dermatomyositis lung cancer Becker muscular dystrophy malignant mesothelioma dermatomyositis pancreatic ductal adenocarcinoma ductal breast carcinoma in situ progressive supranuclear palsy esophageal adenocarcinoma psoriasis gastric carcinoma interstitial cystitis large cell medulloblastoma malignant ependymoma cancer malignant pancreatic neoplasm colorectal carcinoma osteosarcoma Down syndrome pilocytic astrocytoma

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.