ID A0A9L0RAX2_HORSE Unreviewed; 1013 AA.
AC A0A9L0RAX2;
DT 13-SEP-2023, integrated into UniProtKB/TrEMBL.
DT 13-SEP-2023, sequence version 1.
DT 28-JAN-2026, entry version 13.
DE RecName: Full=phosphatidylinositol-4,5-bisphosphate 3-kinase {ECO:0000256|ARBA:ARBA00012010};
DE EC=2.7.1.153 {ECO:0000256|ARBA:ARBA00012010};
GN Name=PIK3CA {ECO:0000313|Ensembl:ENSECAP00000058932.1};
OS Equus caballus (Horse).
OC Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia;
OC Eutheria; Laurasiatheria; Perissodactyla; Equidae; Equus.
OX NCBI_TaxID=9796 {ECO:0000313|Ensembl:ENSECAP00000058932.1, ECO:0000313|Proteomes:UP000002281};
RN [1] {ECO:0000313|Ensembl:ENSECAP00000058932.1, ECO:0000313|Proteomes:UP000002281}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=Thoroughbred {ECO:0000313|Ensembl:ENSECAP00000058932.1,
RC ECO:0000313|Proteomes:UP000002281};
RX PubMed=19892987; DOI=10.1126/science.1178158;
RG Broad Institute Genome Sequencing Platform;
RG Broad Institute Whole Genome Assembly Team;
RA Wade C.M., Giulotto E., Sigurdsson S., Zoli M., Gnerre S., Imsland F.,
RA Lear T.L., Adelson D.L., Bailey E., Bellone R.R., Bloecker H., Distl O.,
RA Edgar R.C., Garber M., Leeb T., Mauceli E., MacLeod J.N., Penedo M.C.T.,
RA Raison J.M., Sharpe T., Vogel J., Andersson L., Antczak D.F., Biagi T.,
RA Binns M.M., Chowdhary B.P., Coleman S.J., Della Valle G., Fryc S.,
RA Guerin G., Hasegawa T., Hill E.W., Jurka J., Kiialainen A., Lindgren G.,
RA Liu J., Magnani E., Mickelson J.R., Murray J., Nergadze S.G., Onofrio R.,
RA Pedroni S., Piras M.F., Raudsepp T., Rocchi M., Roeed K.H., Ryder O.A.,
RA Searle S., Skow L., Swinburne J.E., Syvaenen A.C., Tozaki T., Valberg S.J.,
RA Vaudin M., White J.R., Zody M.C., Lander E.S., Lindblad-Toh K.;
RT "Genome sequence, comparative analysis, and population genetics of the
RT domestic horse.";
RL Science 326:865-867(2009).
RN [2] {ECO:0000313|Ensembl:ENSECAP00000058932.1}
RP IDENTIFICATION.
RC STRAIN=Thoroughbred {ECO:0000313|Ensembl:ENSECAP00000058932.1};
RG Ensembl;
RL Submitted (AUG-2025) to UniProtKB.
RN [3] {ECO:0000313|Ensembl:ENSECAP00000058932.1}
RP IDENTIFICATION.
RC STRAIN=Thoroughbred {ECO:0000313|Ensembl:ENSECAP00000058932.1};
RG Ensembl;
RL Submitted (SEP-2025) to UniProtKB.
CC -!- CATALYTIC ACTIVITY:
CC Reaction=a 1,2-diacyl-sn-glycero-3-phospho-(1D-myo-inositol-4,5-
CC bisphosphate) + ATP = a 1,2-diacyl-sn-glycero-3-phospho-(1D-myo-
CC inositol-3,4,5-trisphosphate) + ADP + H(+); Xref=Rhea:RHEA:21292,
CC ChEBI:CHEBI:15378, ChEBI:CHEBI:30616, ChEBI:CHEBI:57836,
CC ChEBI:CHEBI:58456, ChEBI:CHEBI:456216; EC=2.7.1.153;
CC Evidence={ECO:0000256|ARBA:ARBA00023981};
CC PhysiologicalDirection=left-to-right; Xref=Rhea:RHEA:21293;
CC Evidence={ECO:0000256|ARBA:ARBA00023981};
CC -!- PATHWAY: Phospholipid metabolism; phosphatidylinositol phosphate
CC biosynthesis. {ECO:0000256|ARBA:ARBA00004805}.
CC -!- SIMILARITY: Belongs to the PI3/PI4-kinase family. Type III PI4K
CC subfamily. {ECO:0000256|ARBA:ARBA00006209}.
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DR AlphaFoldDB; A0A9L0RAX2; -.
DR Ensembl; ENSECAT00000113189.1; ENSECAP00000058932.1; ENSECAG00000015019.4.
DR GeneTree; ENSGT00940000155531; -.
DR Proteomes; UP000002281; Chromosome 19.
DR GO; GO:0005737; C:cytoplasm; IEA:UniProtKB-ARBA.
DR GO; GO:0016303; F:1-phosphatidylinositol-3-kinase activity; IEA:InterPro.
DR GO; GO:0046934; F:1-phosphatidylinositol-4,5-bisphosphate 3-kinase activity; IEA:UniProtKB-EC.
DR GO; GO:0005524; F:ATP binding; IEA:UniProtKB-KW.
DR GO; GO:0043491; P:phosphatidylinositol 3-kinase/protein kinase B signal transduction; IEA:InterPro.
DR CDD; cd08398; C2_PI3K_class_I_alpha; 1.
DR CDD; cd05175; PI3Kc_IA_alpha; 1.
DR FunFam; 1.10.1070.11:FF:000006; Phosphatidylinositol 4,5-bisphosphate 3-kinase catalytic subunit; 1.
DR FunFam; 2.60.40.150:FF:000041; Phosphatidylinositol 4,5-bisphosphate 3-kinase catalytic subunit; 1.
DR FunFam; 3.10.20.770:FF:000005; Phosphatidylinositol 4,5-bisphosphate 3-kinase catalytic subunit; 1.
DR FunFam; 3.10.20.90:FF:000055; Phosphatidylinositol 4,5-bisphosphate 3-kinase catalytic subunit; 1.
DR FunFam; 3.10.20.90:FF:000074; Phosphatidylinositol 4,5-bisphosphate 3-kinase catalytic subunit; 1.
DR FunFam; 3.30.1010.10:FF:000007; Phosphatidylinositol 4,5-bisphosphate 3-kinase catalytic subunit; 1.
DR Gene3D; 2.60.40.150; C2 domain; 1.
DR Gene3D; 1.10.1070.11; Phosphatidylinositol 3-/4-kinase, catalytic domain; 1.
DR Gene3D; 3.10.20.90; Phosphatidylinositol 3-kinase Catalytic Subunit, Chain A, domain 1; 2.
DR Gene3D; 3.30.1010.10; Phosphatidylinositol 3-kinase Catalytic Subunit, Chain A, domain 4; 1.
DR Gene3D; 1.25.40.70; Phosphatidylinositol 3-kinase, accessory domain (PIK); 2.
DR InterPro; IPR016024; ARM-type_fold.
DR InterPro; IPR035892; C2_domain_sf.
DR InterPro; IPR011009; Kinase-like_dom_sf.
DR InterPro; IPR037704; PI3-kinase_alpha_cat.
DR InterPro; IPR015433; PI3/4_kinase.
DR InterPro; IPR000403; PI3/4_kinase_cat_dom.
DR InterPro; IPR036940; PI3/4_kinase_cat_sf.
DR InterPro; IPR018936; PI3/4_kinase_CS.
DR InterPro; IPR002420; PI3K-type_C2_dom.
DR InterPro; IPR003113; PI3K_ABD.
DR InterPro; IPR001263; PI3K_accessory_dom.
DR InterPro; IPR042236; PI3K_accessory_sf.
DR InterPro; IPR000341; PI3K_Ras-bd_dom.
DR InterPro; IPR029071; Ubiquitin-like_domsf.
DR PANTHER; PTHR10048:SF107; PHOSPHATIDYLINOSITOL 4,5-BISPHOSPHATE 3-KINASE CATALYTIC SUBUNIT ALPHA ISOFORM; 1.
DR PANTHER; PTHR10048; PHOSPHATIDYLINOSITOL KINASE; 1.
DR Pfam; PF00454; PI3_PI4_kinase; 1.
DR Pfam; PF00792; PI3K_C2; 1.
DR Pfam; PF02192; PI3K_p85B; 1.
DR Pfam; PF00794; PI3K_rbd; 1.
DR Pfam; PF00613; PI3Ka; 1.
DR SMART; SM00142; PI3K_C2; 1.
DR SMART; SM00143; PI3K_p85B; 1.
DR SMART; SM00144; PI3K_rbd; 1.
DR SMART; SM00145; PI3Ka; 1.
DR SMART; SM00146; PI3Kc; 1.
DR SUPFAM; SSF48371; ARM repeat; 1.
DR SUPFAM; SSF49562; C2 domain (Calcium/lipid-binding domain, CaLB); 1.
DR SUPFAM; SSF56112; Protein kinase-like (PK-like); 1.
DR SUPFAM; SSF54236; Ubiquitin-like; 1.
DR PROSITE; PS51547; C2_PI3K; 1.
DR PROSITE; PS00915; PI3_4_KINASE_1; 1.
DR PROSITE; PS00916; PI3_4_KINASE_2; 1.
DR PROSITE; PS50290; PI3_4_KINASE_3; 1.
DR PROSITE; PS51544; PI3K_ABD; 1.
DR PROSITE; PS51546; PI3K_RBD; 1.
DR PROSITE; PS51545; PIK_HELICAL; 1.
PE 3: Inferred from homology;
KW ATP-binding {ECO:0000256|ARBA:ARBA00022840};
KW Kinase {ECO:0000256|ARBA:ARBA00022777};
KW Nucleotide-binding {ECO:0000256|ARBA:ARBA00022741};
KW Reference proteome {ECO:0000313|Proteomes:UP000002281};
KW Transferase {ECO:0000256|ARBA:ARBA00022679}.
FT DOMAIN 16..105
FT /note="PI3K-ABD"
FT /evidence="ECO:0000259|PROSITE:PS51544"
FT DOMAIN 187..289
FT /note="PI3K-RBD"
FT /evidence="ECO:0000259|PROSITE:PS51546"
FT DOMAIN 330..487
FT /note="C2 PI3K-type"
FT /evidence="ECO:0000259|PROSITE:PS51547"
FT DOMAIN 579..639
FT /note="PIK helical"
FT /evidence="ECO:0000259|PROSITE:PS51545"
FT DOMAIN 710..996
FT /note="PI3K/PI4K catalytic"
FT /evidence="ECO:0000259|PROSITE:PS50290"
SQ SEQUENCE 1013 AA; 117823 MW; 4C9C963D01528A28 CRC64;
MPPRPSSGEL WGIHLMPPRI LVECLLPNGM IVTLECLREA TLITIKHELF KEARKYPLHQ
LLQDESSYIF VSVTQEAERE EFFDETRRLC DLRLFQPFLK VIEPVGNREE KILNREIGFA
IGMPVCEFDM VKDPEVQDFR RNILNVCKEA VDLRDLNSPH SRAMYVYPPN VESSPELPKH
IYNKLDKGQI IVVIWVIVSP NNDKQKYTLK INHDCVPEQV IAEAIRKKTR SMLLSSEQLK
LCVLEYQGKY ILKVCGCDEY FLEKYPLSQY KYIRSCIMLG RMPNLMLMAK ESLYSQLPMD
CFTMPSYSRR ISTATPYMNG ETSTKSLWVI NSALRIKILC ATYVNVNIRD IDKIYVRTGI
YHGGEPLCDN VNTQRVPCSN PRWNEWLNYD IYIPDLPRAA RLCLSICSVK GRKGAKEEHC
PLAWGNINLF DYTDTLVSGK MALNLWPVPH GLEDLLNPIG VTGSNPNKET PCLELEFDWF
SSVVKFPDMS VIEEHANWSV SREAGFSYSH AGLSNRLARD NELRENDKEQ LRAICTRDPL
SEITEQEKDF LWSHRHYCVT IPEILPKLLL SVKWNSRDEV AQVLKYEQYL DNLLVRFLLK
KALTNQRIGH FFFWHLKSEM HNKTVSQRFG LLLESYCRAC GMYLKHLNRQ VEAMEKLINL
TDILKQEKKD ETQKVQMKFL VEQMRRPDFM DALQGFLSPL NPAHQLGNLR LEECRIMSSA
KRPLWLNWEN PDIMSELLFQ NNEIIFKNGD DLRQDMLTLQ IIRIMENIWQ NQGLDLRMLP
YGCLSIGDCV GLIEVVRNSH TIMQIQCKGG LKGALQFNSH TLHQWLKDKN KGEIYDAAID
LFTRSCAGYC VATFILGIGD RHNSNIMVKD DGQLFHIDFG HFLDHKKKKF GYKRERVPFV
LTQDFLIVIS KGAQECTKTR EFERFQEMCY KAYLAIRQHA NLFINLFSMM LGSGMPELQS
FDDIAYIRKT LALDKTEQEA LEYFMKQMND AHHGGWTTKM DWIFHTIKQH ALN
//
