ID IGSF8_HUMAN Reviewed; 613 AA. AC Q969P0; Q8NG09; Q96DP4; Q9BTG9; DT 07-MAR-2006, integrated into UniProtKB/Swiss-Prot. DT 01-DEC-2001, sequence version 1. DT 27-MAR-2024, entry version 174. DE RecName: Full=Immunoglobulin superfamily member 8; DE Short=IgSF8; DE AltName: Full=CD81 partner 3; DE AltName: Full=Glu-Trp-Ile EWI motif-containing protein 2; DE Short=EWI-2; DE AltName: Full=Keratinocytes-associated transmembrane protein 4; DE Short=KCT-4; DE AltName: Full=LIR-D1; DE AltName: Full=Prostaglandin regulatory-like protein; DE Short=PGRL; DE AltName: CD_antigen=CD316; DE Flags: Precursor; GN Name=IGSF8; Synonyms=CD81P3, EWI2, KCT4; OS Homo sapiens (Human). OC Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia; OC Eutheria; Euarchontoglires; Primates; Haplorrhini; Catarrhini; Hominidae; OC Homo. OX NCBI_TaxID=9606; RN [1] RP NUCLEOTIDE SEQUENCE [MRNA] (ISOFORM 1), FUNCTION, TISSUE SPECIFICITY, RP IDENTIFICATION BY MASS SPECTROMETRY, AND INTERACTION WITH CD81 AND CD9. RX PubMed=11504738; DOI=10.1074/jbc.m107338200; RA Stipp C.S., Kolesnikova T.V., Hemler M.E.; RT "EWI-2 is a major CD9 and CD81 partner and member of a novel Ig protein RT subfamily."; RL J. Biol. Chem. 276:40545-40554(2001). RN [2] RP NUCLEOTIDE SEQUENCE [MRNA] (ISOFORM 1), IDENTIFICATION BY MASS RP SPECTROMETRY, AND TISSUE SPECIFICITY. RX PubMed=12708969; DOI=10.1042/bj20030343; RA Charrin S., Le Naour F., Labas V., Billard M., Le Caer J.-P., Emile J.-F., RA Petit M.-A., Boucheix C., Rubinstein E.; RT "EWI-2 is a new component of the tetraspanin web in hepatocytes and RT lymphoid cells."; RL Biochem. J. 373:409-421(2003). RN [3] RP NUCLEOTIDE SEQUENCE [MRNA] (ISOFORM 1), AND FUNCTION. RX PubMed=12752121; DOI=10.1046/j.1365-2133.2003.05244.x; RA Bonkobara M., Das A., Takao J., Cruz P.D. Jr., Ariizumi K.; RT "Identification of novel genes for secreted and membrane-anchored proteins RT in human keratinocytes."; RL Br. J. Dermatol. 148:654-664(2003). RN [4] RP NUCLEOTIDE SEQUENCE [MRNA] (ISOFORM 3). RA Zhang W., Li N., Wan T., Cao X.; RT "Identification of novel membrane proteins."; RL Submitted (OCT-2000) to the EMBL/GenBank/DDBJ databases. RN [5] RP NUCLEOTIDE SEQUENCE [LARGE SCALE MRNA] (ISOFORM 2). RC TISSUE=Kidney; RX PubMed=14702039; DOI=10.1038/ng1285; RA Ota T., Suzuki Y., Nishikawa T., Otsuki T., Sugiyama T., Irie R., RA Wakamatsu A., Hayashi K., Sato H., Nagai K., Kimura K., Makita H., RA Sekine M., Obayashi M., Nishi T., Shibahara T., Tanaka T., Ishii S., RA Yamamoto J., Saito K., Kawai Y., Isono Y., Nakamura Y., Nagahari K., RA Murakami K., Yasuda T., Iwayanagi T., Wagatsuma M., Shiratori A., Sudo H., RA Hosoiri T., Kaku Y., Kodaira H., Kondo H., Sugawara M., Takahashi M., RA Kanda K., Yokoi T., Furuya T., Kikkawa E., Omura Y., Abe K., Kamihara K., RA Katsuta N., Sato K., Tanikawa M., Yamazaki M., Ninomiya K., Ishibashi T., RA Yamashita H., Murakawa K., Fujimori K., Tanai H., Kimata M., Watanabe M., RA Hiraoka S., Chiba Y., Ishida S., Ono Y., Takiguchi S., Watanabe S., RA Yosida M., Hotuta T., Kusano J., Kanehori K., Takahashi-Fujii A., Hara H., RA Tanase T.-O., Nomura Y., Togiya S., Komai F., Hara R., Takeuchi K., RA Arita M., Imose N., Musashino K., Yuuki H., Oshima A., Sasaki N., RA Aotsuka S., Yoshikawa Y., Matsunawa H., Ichihara T., Shiohata N., Sano S., RA Moriya S., Momiyama H., Satoh N., Takami S., Terashima Y., Suzuki O., RA Nakagawa S., Senoh A., Mizoguchi H., Goto Y., Shimizu F., Wakebe H., RA Hishigaki H., Watanabe T., Sugiyama A., Takemoto M., Kawakami B., RA Yamazaki M., Watanabe K., Kumagai A., Itakura S., Fukuzumi Y., Fujimori Y., RA Komiyama M., Tashiro H., Tanigami A., Fujiwara T., Ono T., Yamada K., RA Fujii Y., Ozaki K., Hirao M., Ohmori Y., Kawabata A., Hikiji T., RA Kobatake N., Inagaki H., Ikema Y., Okamoto S., Okitani R., Kawakami T., RA Noguchi S., Itoh T., Shigeta K., Senba T., Matsumura K., Nakajima Y., RA Mizuno T., Morinaga M., Sasaki M., Togashi T., Oyama M., Hata H., RA Watanabe M., Komatsu T., Mizushima-Sugano J., Satoh T., Shirai Y., RA Takahashi Y., Nakagawa K., Okumura K., Nagase T., Nomura N., Kikuchi H., RA Masuho Y., Yamashita R., Nakai K., Yada T., Nakamura Y., Ohara O., RA Isogai T., Sugano S.; RT "Complete sequencing and characterization of 21,243 full-length human RT cDNAs."; RL Nat. Genet. 36:40-45(2004). RN [6] RP NUCLEOTIDE SEQUENCE [LARGE SCALE MRNA] (ISOFORM 1). RC TISSUE=Lymph; RX PubMed=15489334; DOI=10.1101/gr.2596504; RG The MGC Project Team; RT "The status, quality, and expansion of the NIH full-length cDNA project: RT the Mammalian Gene Collection (MGC)."; RL Genome Res. 14:2121-2127(2004). RN [7] RP PROTEIN SEQUENCE [LARGE SCALE ANALYSIS] OF 28-40. RC TISSUE=Leukemic T-cell; RX PubMed=19892738; DOI=10.1073/pnas.0908958106; RA Xu G., Shin S.B., Jaffrey S.R.; RT "Global profiling of protease cleavage sites by chemoselective labeling of RT protein N-termini."; RL Proc. Natl. Acad. Sci. U.S.A. 106:19310-19315(2009). RN [8] RP FUNCTION, INTERACTION WITH CD82, IDENTIFICATION BY MASS SPECTROMETRY, AND RP TISSUE SPECIFICITY. RX PubMed=12750295; RA Zhang X.A., Lane W.S., Charrin S., Rubinstein E., Liu L.; RT "EWI2/PGRL associates with the metastasis suppressor KAI1/CD82 and inhibits RT the migration of prostate cancer cells."; RL Cancer Res. 63:2665-2674(2003). RN [9] RP FUNCTION, IDENTIFICATION BY MASS SPECTROMETRY, AND INTERACTION WITH RP INTEGRIN ALPHA-3 BETA-1. RX PubMed=14662754; DOI=10.1083/jcb.200309113; RA Stipp C.S., Kolesnikova T.V., Hemler M.E.; RT "EWI-2 regulates alpha3beta1 integrin-dependent cell functions on laminin- RT 5."; RL J. Cell Biol. 163:1167-1177(2003). RN [10] RP FUNCTION, IDENTIFICATION BY MASS SPECTROMETRY, AND INTERACTION WITH RP INTEGRIN ALPHA-4 BETA-1. RX PubMed=15070678; DOI=10.1182/blood-2003-07-2201; RA Kolesnikova T.V., Stipp C.S., Rao R.M., Lane W.S., Luscinskas F.W., RA Hemler M.E.; RT "EWI-2 modulates lymphocyte integrin alpha4beta1 functions."; RL Blood 103:3013-3019(2004). RN [11] RP GLYCOSYLATION [LARGE SCALE ANALYSIS] AT ASN-327 AND ASN-463. RC TISSUE=Liver; RX PubMed=19159218; DOI=10.1021/pr8008012; RA Chen R., Jiang X., Sun D., Han G., Wang F., Ye M., Wang L., Zou H.; RT "Glycoproteomics analysis of human liver tissue by combination of multiple RT enzyme digestion and hydrazide chemistry."; RL J. Proteome Res. 8:651-661(2009). RN [12] RP PHOSPHORYLATION [LARGE SCALE ANALYSIS] AT SER-518, AND IDENTIFICATION BY RP MASS SPECTROMETRY [LARGE SCALE ANALYSIS]. RC TISSUE=Liver; RX PubMed=24275569; DOI=10.1016/j.jprot.2013.11.014; RA Bian Y., Song C., Cheng K., Dong M., Wang F., Huang J., Sun D., Wang L., RA Ye M., Zou H.; RT "An enzyme assisted RP-RPLC approach for in-depth analysis of human liver RT phosphoproteome."; RL J. Proteomics 96:253-262(2014). CC -!- FUNCTION: May play a key role in diverse functions ascribed to CD81 and CC CD9 such as oocytes fertilization or hepatitis C virus function. May CC regulate proliferation and differentiation of keratinocytes. May be a CC negative regulator of cell motility: suppresses T-cell mobility CC coordinately with CD81, associates with CD82 to suppress prostate CC cancer cell migration, regulates epidermoid cell reaggregation and CC motility on laminin-5 with CD9 and CD81 as key linkers. May also play a CC role on integrin-dependent morphology and motility functions. May CC participate in the regulation of neurite outgrowth and maintenance of CC the neural network in the adult brain. {ECO:0000269|PubMed:11504738, CC ECO:0000269|PubMed:12750295, ECO:0000269|PubMed:12752121, CC ECO:0000269|PubMed:14662754, ECO:0000269|PubMed:15070678}. CC -!- SUBUNIT: Interacts directly with CD82, CD81/tetraspanin-28 and CC CD9/tetraspanin-29. Also interacts with integrin alpha-3/beta-1 and CC integrin alpha-4/beta-1. {ECO:0000269|PubMed:11504738, CC ECO:0000269|PubMed:12750295, ECO:0000269|PubMed:14662754, CC ECO:0000269|PubMed:15070678}. CC -!- INTERACTION: CC Q969P0; Q07627: KRTAP1-1; NbExp=3; IntAct=EBI-8293590, EBI-11959885; CC Q969P0; Q8IUG1: KRTAP1-3; NbExp=3; IntAct=EBI-8293590, EBI-11749135; CC Q969P0; P60372: KRTAP10-4; NbExp=3; IntAct=EBI-8293590, EBI-10178153; CC Q969P0; P60409: KRTAP10-7; NbExp=6; IntAct=EBI-8293590, EBI-10172290; CC Q969P0; P60410: KRTAP10-8; NbExp=6; IntAct=EBI-8293590, EBI-10171774; CC Q969P0; P60411: KRTAP10-9; NbExp=3; IntAct=EBI-8293590, EBI-10172052; CC Q969P0; Q9BYR9: KRTAP2-4; NbExp=3; IntAct=EBI-8293590, EBI-14065470; CC Q969P0; Q6L8G8: KRTAP5-7; NbExp=3; IntAct=EBI-8293590, EBI-11987425; CC Q969P0; P22735: TGM1; NbExp=3; IntAct=EBI-8293590, EBI-2562368; CC -!- SUBCELLULAR LOCATION: Cell membrane {ECO:0000250}; Single-pass membrane CC protein. CC -!- ALTERNATIVE PRODUCTS: CC Event=Alternative splicing; Named isoforms=3; CC Name=1; CC IsoId=Q969P0-1; Sequence=Displayed; CC Name=2; CC IsoId=Q969P0-2; Sequence=VSP_017429, VSP_017430; CC Name=3; CC IsoId=Q969P0-3; Sequence=VSP_017431; CC -!- TISSUE SPECIFICITY: Expressed in brain, kidney, testis, liver and CC placenta with moderate expression in all other tissues. Detected on a CC majority of B-cells, T-cells, and natural killer cells but not on CC monocytes, polynuclear cells and platelets. CC {ECO:0000269|PubMed:11504738, ECO:0000269|PubMed:12708969, CC ECO:0000269|PubMed:12750295}. CC -!- DOMAIN: The Ig-like C2-type domains 3 and 4 are required for CC interaction with CD81. {ECO:0000250}. CC -!- DOMAIN: The short cytoplasmic domain is very basic, interacts with CC membrane PIPs, and mediates plasma membrane localization. CC {ECO:0000250}. CC -!- WEB RESOURCE: Name=Atlas of Genetics and Cytogenetics in Oncology and CC Haematology; CC URL="https://atlasgeneticsoncology.org/gene/45820/IGSF8"; CC --------------------------------------------------------------------------- CC Copyrighted by the UniProt Consortium, see https://www.uniprot.org/terms CC Distributed under the Creative Commons Attribution (CC BY 4.0) License CC --------------------------------------------------------------------------- DR EMBL; AF407274; AAL01052.1; -; mRNA. DR EMBL; AY044845; AAK92220.1; -; mRNA. DR EMBL; AY157579; AAO13163.1; -; mRNA. DR EMBL; AF311906; AAM94901.1; -; mRNA. DR EMBL; AK055843; BAB71027.1; -; mRNA. DR EMBL; BC004108; AAH04108.2; -; mRNA. DR EMBL; BC053881; AAH53881.1; -; mRNA. DR CCDS; CCDS1195.1; -. [Q969P0-1] DR RefSeq; NP_001193594.1; NM_001206665.2. [Q969P0-1] DR RefSeq; NP_001307176.1; NM_001320247.1. [Q969P0-1] DR RefSeq; NP_443100.1; NM_052868.5. [Q969P0-1] DR RefSeq; XP_016858324.1; XM_017002835.1. [Q969P0-1] DR RefSeq; XP_016858325.1; XM_017002836.1. [Q969P0-1] DR RefSeq; XP_016858326.1; XM_017002837.1. [Q969P0-1] DR AlphaFoldDB; Q969P0; -. DR BioGRID; 125011; 233. DR IntAct; Q969P0; 30. DR MINT; Q969P0; -. DR STRING; 9606.ENSP00000357065; -. DR GlyConnect; 1394; 22 N-Linked glycans (2 sites). DR GlyCosmos; Q969P0; 3 sites, 23 glycans. DR GlyGen; Q969P0; 4 sites, 23 N-linked glycans (2 sites), 1 O-linked glycan (1 site). DR iPTMnet; Q969P0; -. DR PhosphoSitePlus; Q969P0; -. DR SwissPalm; Q969P0; -. DR BioMuta; IGSF8; -. DR DMDM; 74762642; -. DR EPD; Q969P0; -. DR jPOST; Q969P0; -. DR MassIVE; Q969P0; -. DR MaxQB; Q969P0; -. DR PaxDb; 9606-ENSP00000357065; -. DR PeptideAtlas; Q969P0; -. DR ProteomicsDB; 75806; -. [Q969P0-1] DR ProteomicsDB; 75807; -. [Q969P0-2] DR ProteomicsDB; 75808; -. [Q969P0-3] DR Pumba; Q969P0; -. DR Antibodypedia; 2186; 290 antibodies from 29 providers. DR DNASU; 93185; -. DR Ensembl; ENST00000314485.12; ENSP00000316664.7; ENSG00000162729.14. [Q969P0-1] DR Ensembl; ENST00000368086.5; ENSP00000357065.1; ENSG00000162729.14. [Q969P0-1] DR Ensembl; ENST00000614243.4; ENSP00000477565.1; ENSG00000162729.14. [Q969P0-1] DR GeneID; 93185; -. DR KEGG; hsa:93185; -. DR MANE-Select; ENST00000314485.12; ENSP00000316664.7; NM_052868.6; NP_443100.1. DR UCSC; uc001fuz.4; human. [Q969P0-1] DR AGR; HGNC:17813; -. DR CTD; 93185; -. DR DisGeNET; 93185; -. DR GeneCards; IGSF8; -. DR HGNC; HGNC:17813; IGSF8. DR HPA; ENSG00000162729; Tissue enhanced (brain). DR MIM; 606644; gene. DR neXtProt; NX_Q969P0; -. DR OpenTargets; ENSG00000162729; -. DR PharmGKB; PA29767; -. DR VEuPathDB; HostDB:ENSG00000162729; -. DR eggNOG; ENOG502QTUT; Eukaryota. DR GeneTree; ENSGT00940000161314; -. DR HOGENOM; CLU_005187_2_0_1; -. DR InParanoid; Q969P0; -. DR OMA; VQWLRWP; -. DR OrthoDB; 4170975at2759; -. DR PhylomeDB; Q969P0; -. DR TreeFam; TF332702; -. DR PathwayCommons; Q969P0; -. DR SignaLink; Q969P0; -. DR BioGRID-ORCS; 93185; 9 hits in 1157 CRISPR screens. DR ChiTaRS; IGSF8; human. DR GeneWiki; IGSF8; -. DR GenomeRNAi; 93185; -. DR Pharos; Q969P0; Tbio. DR PRO; PR:Q969P0; -. DR Proteomes; UP000005640; Chromosome 1. DR RNAct; Q969P0; Protein. DR Bgee; ENSG00000162729; Expressed in right hemisphere of cerebellum and 146 other cell types or tissues. DR ExpressionAtlas; Q969P0; baseline and differential. DR GO; GO:0070062; C:extracellular exosome; HDA:UniProtKB. DR GO; GO:0043231; C:intracellular membrane-bounded organelle; IDA:HPA. DR GO; GO:0016020; C:membrane; IDA:UniProtKB. DR GO; GO:0005886; C:plasma membrane; IEA:UniProtKB-SubCell. DR GO; GO:0048870; P:cell motility; NAS:UniProtKB. DR GO; GO:0007399; P:nervous system development; NAS:UniProtKB. DR GO; GO:0007338; P:single fertilization; NAS:UniProtKB. DR GO; GO:0007519; P:skeletal muscle tissue development; NAS:UniProtKB. DR Gene3D; 2.60.40.10; Immunoglobulins; 2. DR InterPro; IPR007110; Ig-like_dom. DR InterPro; IPR036179; Ig-like_dom_sf. DR InterPro; IPR013783; Ig-like_fold. DR InterPro; IPR003599; Ig_sub. DR InterPro; IPR013106; Ig_V-set. DR PANTHER; PTHR12207:SF22; IMMUNOGLOBULIN SUPERFAMILY MEMBER 8; 1. DR PANTHER; PTHR12207; V-SET AND TRANSMEMBRANE DOMAIN-CONTAINING PROTEIN; 1. DR Pfam; PF07686; V-set; 1. DR SMART; SM00409; IG; 4. DR SUPFAM; SSF48726; Immunoglobulin; 4. DR PROSITE; PS50835; IG_LIKE; 2. DR UCD-2DPAGE; Q969P0; -. DR Genevisible; Q969P0; HS. PE 1: Evidence at protein level; KW Alternative splicing; Cell membrane; Direct protein sequencing; KW Disulfide bond; Glycoprotein; Immunoglobulin domain; Lipoprotein; Membrane; KW Palmitate; Phosphoprotein; Reference proteome; Repeat; Signal; KW Transmembrane; Transmembrane helix. FT SIGNAL 1..27 FT /evidence="ECO:0000269|PubMed:19892738" FT CHAIN 28..613 FT /note="Immunoglobulin superfamily member 8" FT /id="PRO_0000226247" FT TOPO_DOM 28..579 FT /note="Extracellular" FT /evidence="ECO:0000255" FT TRANSMEM 580..600 FT /note="Helical" FT /evidence="ECO:0000255" FT TOPO_DOM 601..613 FT /note="Cytoplasmic" FT /evidence="ECO:0000255" FT DOMAIN 28..149 FT /note="Ig-like C2-type 1" FT DOMAIN 162..286 FT /note="Ig-like C2-type 2" FT DOMAIN 303..424 FT /note="Ig-like C2-type 3" FT DOMAIN 431..560 FT /note="Ig-like C2-type 4" FT REGION 155..174 FT /note="Disordered" FT /evidence="ECO:0000256|SAM:MobiDB-lite" FT MOTIF 274..276 FT /note="EWI motif" FT MOD_RES 518 FT /note="Phosphoserine" FT /evidence="ECO:0007744|PubMed:24275569" FT LIPID 604 FT /note="S-palmitoyl cysteine" FT /evidence="ECO:0000250" FT LIPID 605 FT /note="S-palmitoyl cysteine" FT /evidence="ECO:0000250" FT CARBOHYD 50 FT /note="N-linked (GlcNAc...) asparagine" FT /evidence="ECO:0000255" FT CARBOHYD 327 FT /note="N-linked (GlcNAc...) asparagine" FT /evidence="ECO:0000269|PubMed:19159218" FT CARBOHYD 463 FT /note="N-linked (GlcNAc...) asparagine" FT /evidence="ECO:0000269|PubMed:19159218" FT DISULFID 49..127 FT /evidence="ECO:0000255|PROSITE-ProRule:PRU00114" FT DISULFID 186..270 FT /evidence="ECO:0000255|PROSITE-ProRule:PRU00114" FT DISULFID 326..406 FT /evidence="ECO:0000255|PROSITE-ProRule:PRU00114" FT DISULFID 462..544 FT /evidence="ECO:0000255|PROSITE-ProRule:PRU00114" FT VAR_SEQ 1..241 FT /note="Missing (in isoform 2)" FT /evidence="ECO:0000303|PubMed:14702039" FT /id="VSP_017429" FT VAR_SEQ 242..315 FT /note="ELRLGKEGTDRYRMVVGGAQAGDAGTYHCTAAEWIQDPDGSWAQIAEKRAVL FT AHVDVQTLSSQLAVTVGPGERR -> MRGRSWHWAAWRGQAHRSTHTWQCPLGDLCPRH FT QLGGQLCRKWWESGQTWPWRLELPMLSDWLQGSFVWARKGP (in isoform 2)" FT /evidence="ECO:0000303|PubMed:14702039" FT /id="VSP_017430" FT VAR_SEQ 475..561 FT /note="Missing (in isoform 3)" FT /evidence="ECO:0000303|Ref.4" FT /id="VSP_017431" FT CONFLICT 303 FT /note="S -> R (in Ref. 4; AAM94901)" FT /evidence="ECO:0000305" FT CONFLICT 306 FT /note="A -> P (in Ref. 4; AAM94901)" FT /evidence="ECO:0000305" SQ SEQUENCE 613 AA; 65034 MW; A7255D54D42EFB88 CRC64; MGALRPTLLP PSLPLLLLLM LGMGCWAREV LVPEGPLYRV AGTAVSISCN VTGYEGPAQQ NFEWFLYRPE APDTALGIVS TKDTQFSYAV FKSRVVAGEV QVQRLQGDAV VLKIARLQAQ DAGIYECHTP STDTRYLGSY SGKVELRVLP DVLQVSAAPP GPRGRQAPTS PPRMTVHEGQ ELALGCLART STQKHTHLAV SFGRSVPEAP VGRSTLQEVV GIRSDLAVEA GAPYAERLAA GELRLGKEGT DRYRMVVGGA QAGDAGTYHC TAAEWIQDPD GSWAQIAEKR AVLAHVDVQT LSSQLAVTVG PGERRIGPGE PLELLCNVSG ALPPAGRHAA YSVGWEMAPA GAPGPGRLVA QLDTEGVGSL GPGYEGRHIA MEKVASRTYR LRLEAARPGD AGTYRCLAKA YVRGSGTRLR EAASARSRPL PVHVREEGVV LEAVAWLAGG TVYRGETASL LCNISVRGGP PGLRLAASWW VERPEDGELS SVPAQLVGGV GQDGVAELGV RPGGGPVSVE LVGPRSHRLR LHSLGPEDEG VYHCAPSAWV QHADYSWYQA GSARSGPVTV YPYMHALDTL FVPLLVGTGV ALVTGATVLG TITCCFMKRL RKR //