{"entryType":"UniProtKB reviewed (Swiss-Prot)","primaryAccession":"P27986","secondaryAccessions":["B3KT19","D3DWA0","E7EX19","Q15747","Q4VBZ7","Q53EM6","Q8IXA2","Q8N1C5"],"uniProtkbId":"P85A_HUMAN","entryAudit":{"firstPublicDate":"1992-08-01","lastAnnotationUpdateDate":"2026-09-02","lastSequenceUpdateDate":"2006-11-28","entryVersion":271,"sequenceVersion":2},"annotationScore":5.0,"organism":{"scientificName":"Homo sapiens","commonName":"Human","taxonId":9606,"lineage":["Eukaryota","Metazoa","Chordata","Craniata","Vertebrata","Euteleostomi","Mammalia","Eutheria","Euarchontoglires","Primates","Haplorrhini","Catarrhini","Hominidae","Homo"]},"proteinExistence":"1: Evidence at protein level","proteinDescription":{"recommendedName":{"fullName":{"value":"Phosphatidylinositol 3-kinase regulatory subunit alpha"},"shortNames":[{"value":"PI3-kinase regulatory subunit alpha"},{"value":"PI3K regulatory subunit alpha"},{"value":"PtdIns-3-kinase regulatory subunit alpha"}]},"alternativeNames":[{"fullName":{"value":"Phosphatidylinositol 3-kinase 85 kDa regulatory subunit alpha"},"shortNames":[{"value":"PI3-kinase subunit p85-alpha"},{"value":"PtdIns-3-kinase regulatory subunit p85-alpha"}]}]},"genes":[{"geneName":{"value":"PIK3R1"},"synonyms":[{"value":"GRB1"}]}],"comments":[{"texts":[{"evidences":[{"evidenceCode":"ECO:0000269","source":"PubMed","id":"17626883"},{"evidenceCode":"ECO:0000269","source":"PubMed","id":"19805105"},{"evidenceCode":"ECO:0000269","source":"PubMed","id":"20348923"},{"evidenceCode":"ECO:0000269","source":"PubMed","id":"7518429"}],"value":"Binds to activated (phosphorylated) protein-Tyr kinases, through its SH2 domain, and acts as an adapter, mediating the association of the p110 catalytic unit to the plasma membrane. Necessary for the insulin-stimulated increase in glucose uptake and glycogen synthesis in insulin-sensitive tissues. Plays an important role in signaling in response to FGFR1, FGFR2, FGFR3, FGFR4, KITLG/SCF, KIT, PDGFRA and PDGFRB. Likewise, plays a role in ITGB2 signaling (PubMed:17626883, PubMed:19805105, PubMed:7518429). Modulates the cellular response to ER stress by promoting nuclear translocation of XBP1 isoform 2 in a ER stress- and/or insulin-dependent manner during metabolic overloading in the liver and hence plays a role in glucose tolerance improvement (PubMed:20348923)"}],"commentType":"FUNCTION"},{"texts":[{"evidences":[{"evidenceCode":"ECO:0000250","source":"UniProtKB","id":"P23727"},{"evidenceCode":"ECO:0000250","source":"UniProtKB","id":"P26450"},{"evidenceCode":"ECO:0000250","source":"UniProtKB","id":"Q63787"},{"evidenceCode":"ECO:0000269","source":"PubMed","id":"10086340"},{"evidenceCode":"ECO:0000269","source":"PubMed","id":"10528161"},{"evidenceCode":"ECO:0000269","source":"PubMed","id":"10739672"},{"evidenceCode":"ECO:0000269","source":"PubMed","id":"10867024"},{"evidenceCode":"ECO:0000269","source":"PubMed","id":"10995743"},{"evidenceCode":"ECO:0000269","source":"PubMed","id":"11087752"},{"evidenceCode":"ECO:0000269","source":"PubMed","id":"11526404"},{"evidenceCode":"ECO:0000269","source":"PubMed","id":"11567151"},{"evidenceCode":"ECO:0000269","source":"PubMed","id":"11912194"},{"evidenceCode":"ECO:0000269","source":"PubMed","id":"12359715"},{"evidenceCode":"ECO:0000269","source":"PubMed","id":"15302586"},{"evidenceCode":"ECO:0000269","source":"PubMed","id":"15488758"},{"evidenceCode":"ECO:0000269","source":"PubMed","id":"18721752"},{"evidenceCode":"ECO:0000269","source":"PubMed","id":"19109239"},{"evidenceCode":"ECO:0000269","source":"PubMed","id":"19286672"},{"evidenceCode":"ECO:0000269","source":"PubMed","id":"19805105"},{"evidenceCode":"ECO:0000269","source":"PubMed","id":"19807924"},{"evidenceCode":"ECO:0000269","source":"PubMed","id":"20348923"},{"evidenceCode":"ECO:0000269","source":"PubMed","id":"21200133"},{"evidenceCode":"ECO:0000269","source":"PubMed","id":"21954290"},{"evidenceCode":"ECO:0000269","source":"PubMed","id":"23676467"},{"evidenceCode":"ECO:0000269","source":"PubMed","id":"27109099"},{"evidenceCode":"ECO:0000269","source":"PubMed","id":"28903391"},{"evidenceCode":"ECO:0000269","source":"PubMed","id":"28955049"},{"evidenceCode":"ECO:0000269","source":"PubMed","id":"30523347"},{"evidenceCode":"ECO:0000269","source":"PubMed","id":"32606397"},{"evidenceCode":"ECO:0000269","source":"PubMed","id":"7537849"},{"evidenceCode":"ECO:0000269","source":"PubMed","id":"7541045"},{"evidenceCode":"ECO:0000269","source":"PubMed","id":"7568038"},{"evidenceCode":"ECO:0000269","source":"PubMed","id":"7692233"},{"evidenceCode":"ECO:0000269","source":"PubMed","id":"8276809"},{"evidenceCode":"ECO:0000269","source":"PubMed","id":"8628286"},{"evidenceCode":"ECO:0000269","source":"PubMed","id":"8940081"},{"evidenceCode":"ECO:0000269","source":"PubMed","id":"9038210"},{"evidenceCode":"ECO:0000269","source":"PubMed","id":"9178760"},{"evidenceCode":"ECO:0000269","source":"PubMed","id":"9489702"},{"evidenceCode":"ECO:0000269","source":"PubMed","id":"9553137"},{"evidenceCode":"ECO:0000269","source":"PubMed","id":"9687533"}],"value":"Heterodimer of a regulatory subunit PIK3R1 and a p110 catalytic subunit (PIK3CA, PIK3CB or PIK3CD). Interacts (via SH2 domains) with CCDC88A/GIV (tyrosine-phosphorylated form); the interaction enables recruitment of PIK3R1 to the EGFR receptor, enhancing PI3K activity and cell migration (PubMed:21954290). Interacts (via SH2 domain) with CSF1R (tyrosine phosphorylated). Interacts with PIK3R2; the interaction is dissociated in an insulin-dependent manner (By similarity). Interacts with XBP1 isoform 2; the interaction is direct and induces translocation of XBP1 isoform 2 into the nucleus in a ER stress- and/or insulin-dependent but PI3K-independent manner (PubMed:20348923). Interacts with FER. Interacts (via SH2 domain) with TEK/TIE2 (tyrosine phosphorylated). Interacts with PTK2/FAK1 (By similarity). Interacts with phosphorylated TOM1L1. Interacts with phosphorylated LIME1 upon TCR and/or BCR activation. Interacts with SOCS7. Interacts with RUFY3. Interacts (via SH2 domain) with CSF1R (tyrosine phosphorylated). Interacts with LYN (via SH3 domain); this enhances enzyme activity (By similarity). Interacts with phosphorylated LAT, LAX1 and TRAT1 upon TCR activation. Interacts with CBLB. The SH2 domains interact with the YTHM motif of phosphorylated INSR in vitro. Also interacts with tyrosine-phosphorylated IGF1R in vitro. Interacts with CD28 and CD3Z upon T-cell activation. Interacts with IRS1, IRS2 and phosphorylated IRS4, as well as with NISCH and HCST (PubMed:8628286, PubMed:19109239). Interacts with FASLG, KIT and BCR. Interacts with AXL, FGFR1, FGFR2, FGFR3 and FGFR4 (phosphorylated). Interacts with FGR and HCK. Interacts with PDGFRA (tyrosine phosphorylated) and PDGFRB (tyrosine phosphorylated). Interacts with ERBB4 (phosphorylated). Interacts with NTRK1 (phosphorylated upon ligand-binding). Interacts with SACK1B; activates the PI3K/AKT signaling cascade (PubMed:23676467). Interacts with APPL1 and APPL2 (By similarity). Interacts with SRC (PubMed:28903391). Interacts with ALOX5; this interaction bridges ALOX5 with CD40 after CD40 ligation in B cells and leads to the production of reactive oxygen species (ROS) (PubMed:21200133). Interacts with TYK2 (PubMed:10995743). Interacts with nephrin NPHN1; the interaction is reduced by high glucose levels (PubMed:28955049). Interacts with CASP8 (phosphorylated on Tyr-380) (PubMed:27109099). Interacts with CD28 (PubMed:7568038). Interacts with ICOS (PubMed:30523347). Interacts with FOXM1 isoform 5 (FOXM1D); FOXM1D also simultaneously binds to the PI3K catalytic subunit which relieves the inhibitory effect of the regulatory subunit on the kinase activity of the catalytic subunit (PubMed:32606397). Interacts with ERBB3 (By similarity)"}],"commentType":"SUBUNIT"},{"texts":[{"evidences":[{"evidenceCode":"ECO:0000269","source":"PubMed","id":"12009866"}],"value":"(Microbial infection) Interacts with HIV-1 Nef to activate the Nef associated p21-activated kinase (PAK). This interaction depends on the C-terminus of both proteins and leads to increased production of HIV"}],"commentType":"SUBUNIT"},{"texts":[{"evidences":[{"evidenceCode":"ECO:0000269","source":"PubMed","id":"12186904"}],"value":"(Microbial infection) Interacts with HCV NS5A"}],"commentType":"SUBUNIT"},{"texts":[{"evidences":[{"evidenceCode":"ECO:0000269","source":"PubMed","id":"21228233"}],"value":"(Microbial infection) Interacts with herpes simplex virus 1 UL46; this interaction activates the PI3K/AKT pathway"}],"commentType":"SUBUNIT"},{"texts":[{"evidences":[{"evidenceCode":"ECO:0000269","source":"PubMed","id":"23192871"}],"value":"(Microbial infection) Interacts with herpes simplex virus 1 UL46 and varicella virus ORF12; this interaction activates the PI3K/AKT pathway"}],"commentType":"SUBUNIT"},{"commentType":"INTERACTION","interactions":[{"interactantOne":{"uniProtKBAccession":"P27986","intActId":"EBI-79464"},"interactantTwo":{"uniProtKBAccession":"Q8IZP0","geneName":"ABI1","intActId":"EBI-375446"},"numberOfExperiments":8,"organismDiffer":false},{"interactantOne":{"uniProtKBAccession":"P27986","intActId":"EBI-79464"},"interactantTwo":{"uniProtKBAccession":"P42684","geneName":"ABL2","intActId":"EBI-1102694"},"numberOfExperiments":2,"organismDiffer":false},{"interactantOne":{"uniProtKBAccession":"P27986","intActId":"EBI-79464"},"interactantTwo":{"uniProtKBAccession":"Q9UM73","geneName":"ALK","intActId":"EBI-357361"},"numberOfExperiments":3,"organismDiffer":false},{"interactantOne":{"uniProtKBAccession":"P27986","intActId":"EBI-79464"},"interactantTwo":{"uniProtKBAccession":"P10275","geneName":"AR","intActId":"EBI-608057"},"numberOfExperiments":5,"organismDiffer":false},{"interactantOne":{"uniProtKBAccession":"P27986","intActId":"EBI-79464"},"interactantTwo":{"uniProtKBAccession":"P30530","geneName":"AXL","intActId":"EBI-2850927"},"numberOfExperiments":3,"organismDiffer":false},{"interactantOne":{"uniProtKBAccession":"P27986","intActId":"EBI-79464"},"interactantTwo":{"uniProtKBAccession":"P15056","geneName":"BRAF","intActId":"EBI-365980"},"numberOfExperiments":3,"organismDiffer":false},{"interactantOne":{"uniProtKBAccession":"P27986","intActId":"EBI-79464"},"interactantTwo":{"uniProtKBAccession":"P22681","geneName":"CBL","intActId":"EBI-518228"},"numberOfExperiments":5,"organismDiffer":false},{"interactantOne":{"uniProtKBAccession":"P27986","intActId":"EBI-79464"},"interactantTwo":{"uniProtKBAccession":"P10747","geneName":"CD28","intActId":"EBI-4314301"},"numberOfExperiments":10,"organismDiffer":false},{"interactantOne":{"uniProtKBAccession":"P27986","intActId":"EBI-79464"},"interactantTwo":{"uniProtKBAccession":"Q13111","geneName":"CHAF1A","intActId":"EBI-1020839"},"numberOfExperiments":2,"organismDiffer":false},{"interactantOne":{"uniProtKBAccession":"P27986","intActId":"EBI-79464"},"interactantTwo":{"uniProtKBAccession":"Q8IY22","geneName":"CMIP","intActId":"EBI-7689652"},"numberOfExperiments":2,"organismDiffer":false},{"interactantOne":{"uniProtKBAccession":"P27986","intActId":"EBI-79464"},"interactantTwo":{"uniProtKBAccession":"P16410","geneName":"CTLA4","intActId":"EBI-1030991"},"numberOfExperiments":3,"organismDiffer":false},{"interactantOne":{"uniProtKBAccession":"P27986","intActId":"EBI-79464"},"interactantTwo":{"uniProtKBAccession":"Q9Y2H0","geneName":"DLGAP4","intActId":"EBI-722139"},"numberOfExperiments":2,"organismDiffer":false},{"interactantOne":{"uniProtKBAccession":"P27986","intActId":"EBI-79464"},"interactantTwo":{"uniProtKBAccession":"P00533","geneName":"EGFR","intActId":"EBI-297353"},"numberOfExperiments":6,"organismDiffer":false},{"interactantOne":{"uniProtKBAccession":"P27986","intActId":"EBI-79464"},"interactantTwo":{"uniProtKBAccession":"P41970","geneName":"ELK3","intActId":"EBI-1758534"},"numberOfExperiments":2,"organismDiffer":false},{"interactantOne":{"uniProtKBAccession":"P27986","intActId":"EBI-79464"},"interactantTwo":{"uniProtKBAccession":"P04626","geneName":"ERBB2","intActId":"EBI-641062"},"numberOfExperiments":12,"organismDiffer":false},{"interactantOne":{"uniProtKBAccession":"P27986","intActId":"EBI-79464"},"interactantTwo":{"uniProtKBAccession":"P21860","geneName":"ERBB3","intActId":"EBI-720706"},"numberOfExperiments":41,"organismDiffer":false},{"interactantOne":{"uniProtKBAccession":"P27986","intActId":"EBI-79464"},"interactantTwo":{"uniProtKBAccession":"P48023","geneName":"FASLG","intActId":"EBI-495538"},"numberOfExperiments":2,"organismDiffer":false},{"interactantOne":{"uniProtKBAccession":"P27986","intActId":"EBI-79464"},"interactantTwo":{"uniProtKBAccession":"P11362","geneName":"FGFR1","intActId":"EBI-1028277"},"numberOfExperiments":6,"organismDiffer":false},{"interactantOne":{"uniProtKBAccession":"P27986","intActId":"EBI-79464"},"interactantTwo":{"uniProtKBAccession":"P17948","geneName":"FLT1","intActId":"EBI-1026718"},"numberOfExperiments":3,"organismDiffer":false},{"interactantOne":{"uniProtKBAccession":"P27986","intActId":"EBI-79464"},"interactantTwo":{"uniProtKBAccession":"P36888","geneName":"FLT3","intActId":"EBI-3946257"},"numberOfExperiments":2,"organismDiffer":false},{"interactantOne":{"uniProtKBAccession":"P27986","intActId":"EBI-79464"},"interactantTwo":{"uniProtKBAccession":"Q13480","geneName":"GAB1","intActId":"EBI-517684"},"numberOfExperiments":33,"organismDiffer":false},{"interactantOne":{"uniProtKBAccession":"P27986","intActId":"EBI-79464"},"interactantTwo":{"uniProtKBAccession":"Q13322","geneName":"GRB10","intActId":"EBI-80275"},"numberOfExperiments":2,"organismDiffer":false},{"interactantOne":{"uniProtKBAccession":"P27986","intActId":"EBI-79464"},"interactantTwo":{"uniProtKBAccession":"P62993","geneName":"GRB2","intActId":"EBI-401755"},"numberOfExperiments":7,"organismDiffer":false},{"interactantOne":{"uniPr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