Gene Information
Gene NameCD81
OrganismHomo sapiens (Human)
Gene Length236
Protein NamesCD81 antigen (26 kDa cell surface protein TAPA-1) (Target of the antiproliferative antibody 1) (Tetraspanin-28) (Tspan-28) (CD antigen CD81)
Target NameNA
Target TypeNA
Gene Age544 ( ENSG00000110651 )
Evolutionary StageEumetazoa
AlphaFoldDBP60033
Gene CardCD81
Uniprot IDP60033
PfamPF00335
In ASDno
Allosteric Predictionyes (0.145546851)
Ortholog in AnimalsAlpaca_ CD81 ( ortholog_one2one )
GuineaPig_ CD81 ( ortholog_one2one )
Macaque_ CD81 ( ortholog_one2one )
Mouse_ Cd81 ( ortholog_one2one )
Pig_ CD81 ( ortholog_one2one )
Rat_ Cd81 ( ortholog_one2one )
OhnologsCD9, TSPAN2
ParalogsROM1, TSPAN12, CD63, TSPAN10, CD9, TSPAN6, TSPAN5, CD37, CD151, TSPAN4, TSPAN1, TSPAN31, UPK1A, TSPAN17, TSPAN11, TSPAN32, TSPAN8, TSPAN13, TSPAN2, CD53, TSPAN9, TSPAN18, CD82, TSPAN16, TSPAN19, TSPAN7, UPK1B, TSPAN3, TSPAN14, TSPAN15, PRPH2, TSPAN33
TissueNA
Tissue SpecificityExpressed on B cells (at protein level) (PubMed:20237408). Expressed in hepatocytes (at protein level) (PubMed:12483205). Expressed in monocytes/macrophages (at protein level) (PubMed:12796480). Expressed on both naive and memory CD4-positive T cells (at protein level) (PubMed:22307619). {ECO:0000269|PubMed:12483205, ECO:0000269|PubMed:12796480, ECO:0000269|PubMed:20237408, ECO:0000269|PubMed:22307619}.
Pharmacological Animal ModelsNULL(Chimpanzee);NULL(Mouse);0.187550(Rat);0.105000(Rabbit)
Gene Ontology
(biological process)
Gene Ontology
(cellular component)
Gene Ontology
(molecular function)
PDB 1G8Q  (X-ray  1.60A  1IV5  (X-ray  2.60A  3X0E  (X-ray  1.84A  5DFV  (X-ray  2.80A  5DFW  (X-ray  2.33A  5M2C  (X-ray  1.96A  5M33  (X-ray  1.28A  5M3D  (X-ray  2.38A  5M3T  (X-ray  2.02A  5M4R  (X-ray  3.10A  5TCX  (X-ray  2.96A  6EJG  (X-ray  2.82A  6EJM  (X-ray  2.15A  6EK2  (X-ray  2.65A  6U9S  (X-ray  2.40A  7JIC  (EM  3.80A 
DBSNP NA 
Subcellular location [CC]Cell membrane {ECO:0000269|PubMed:1383329, ECO:0000269|PubMed:1695320, ECO:0000269|PubMed:20237408, ECO:0000269|PubMed:22307619, ECO:0000269|PubMed:2398277, ECO:0000269|PubMed:26354436};
Multi-pass membrane protein {ECO:0000255}. Basolateral cell membrane {ECO:0000269|PubMed:20375010};
Multi-pass membrane protein {ECO:0000255}. Note=Associates with CLDN1 and the CLDN1-CD81 complex localizes to the basolateral cell membrane. {ECO:0000269|PubMed:20375010}.
Mouse PG classificationLPG
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