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Protein

Phosphatidylinositol 4,5-bisphosphate 3-kinase catalytic subunit beta isoform

Gene

Pik3cb

Organism
Mus musculus (Mouse)
Status
Reviewed-Annotation score: -Experimental evidence at protein leveli

Functioni

Phosphoinositide-3-kinase (PI3K) that phosphorylates PtdIns (Phosphatidylinositol), PtdIns4P (Phosphatidylinositol 4-phosphate) and PtdIns(4,5)P2 (Phosphatidylinositol 4,5-bisphosphate) to generate phosphatidylinositol 3,4,5-trisphosphate (PIP3). PIP3 plays a key role by recruiting PH domain-containing proteins to the membrane, including AKT1 and PDPK1, activating signaling cascades involved in cell growth, survival, proliferation, motility and morphology. Involved in the activation of AKT1 upon stimulation by G-protein coupled receptors (GPCRs) ligands such as CXCL12, sphingosine 1-phosphate, and lysophosphatidic acid. May also act downstream receptor tyrosine kinases. Required in different signaling pathways for stable platelet adhesion and aggregation. Plays a role in platelet activation signaling triggered by GPCRs, alpha-IIb/beta-3 integrins (ITGA2B/ ITGB3) and ITAM (immunoreceptor tyrosine-based activation motif)-bearing receptors such as GP6. Regulates the strength of adhesion of ITGA2B/ ITGB3 activated receptors necessary for the cellular transmission of contractile forces. Required for platelet aggregation induced by F2 (thrombin) and thromboxane A2 (TXA2). Has a role in cell survival. May have a role in cell migration. Involved in the early stage of autophagosome formation. Modulates the intracellular level of PtdIns3P (Phosphatidylinositol 3-phosphate) and activates PIK3C3 kinase activity. May act as a scaffold, independently of its lipid kinase activity to positively regulate autophagy. May have a role in insulin signaling as scaffolding protein in which the lipid kinase activity is not required. May have a kinase-independent function in regulating cell proliferation and in clathrin-mediated endocytosis. Mediator of oncogenic signal in cell lines lacking PTEN. The lipid kinase activity is necessary for its role in oncogenic transformation. Required for the growth of ERBB2 and RAS driven tumors.6 Publications

Catalytic activityi

ATP + 1-phosphatidyl-1D-myo-inositol 4,5-bisphosphate = ADP + 1-phosphatidyl-1D-myo-inositol 3,4,5-trisphosphate.

Pathwayi: phosphatidylinositol phosphate biosynthesis

This protein is involved in the pathway phosphatidylinositol phosphate biosynthesis, which is part of Phospholipid metabolism.
View all proteins of this organism that are known to be involved in the pathway phosphatidylinositol phosphate biosynthesis and in Phospholipid metabolism.

GO - Molecular functioni

GO - Biological processi

  • adaptive immune response Source: GO_Central
  • angiogenesis involved in wound healing Source: MGI
  • autophagy Source: UniProtKB-KW
  • cell chemotaxis Source: GO_Central
  • cellular calcium ion homeostasis Source: MGI
  • embryonic cleavage Source: MGI
  • endocytosis Source: UniProtKB-KW
  • endothelial cell proliferation Source: MGI
  • homophilic cell adhesion via plasma membrane adhesion molecules Source: MGI
  • inflammatory response Source: GO_Central
  • innate immune response Source: GO_Central
  • phosphatidylinositol 3-kinase signaling Source: MGI
  • phosphorylation Source: MGI
  • platelet activation Source: MGI
  • positive regulation of gene expression Source: MGI
  • positive regulation of neutrophil apoptotic process Source: MGI
  • protein phosphorylation Source: GO_Central
  • regulation of cell-matrix adhesion Source: MGI
  • response to wounding Source: MGI

Keywordsi

Molecular functionKinase, Transferase
Biological processAutophagy, Cell adhesion, Endocytosis
LigandATP-binding, Nucleotide-binding

Enzyme and pathway databases

ReactomeiR-MMU-109704 PI3K Cascade
R-MMU-114604 GPVI-mediated activation cascade
R-MMU-1257604 PIP3 activates AKT signaling
R-MMU-1660499 Synthesis of PIPs at the plasma membrane
R-MMU-186763 Downstream signal transduction
R-MMU-198203 PI3K/AKT activation
R-MMU-202424 Downstream TCR signaling
R-MMU-2029485 Role of phospholipids in phagocytosis
R-MMU-210993 Tie2 Signaling
R-MMU-2424491 DAP12 signaling
R-MMU-2730905 Role of LAT2/NTAL/LAB on calcium mobilization
R-MMU-392451 G beta:gamma signalling through PI3Kgamma
R-MMU-4420097 VEGFA-VEGFR2 Pathway
R-MMU-512988 Interleukin-3, 5 and GM-CSF signaling
R-MMU-6811558 PI5P, PP2A and IER3 Regulate PI3K/AKT Signaling
R-MMU-8853659 RET signaling
R-MMU-912526 Interleukin receptor SHC signaling
R-MMU-912631 Regulation of signaling by CBL
UniPathwayiUPA00220

Names & Taxonomyi

Protein namesi
Recommended name:
Phosphatidylinositol 4,5-bisphosphate 3-kinase catalytic subunit beta isoform (EC:2.7.1.153)
Short name:
PI3-kinase subunit beta
Short name:
PI3K-beta
Short name:
PI3Kbeta
Short name:
PtdIns-3-kinase subunit beta
Alternative name(s):
Phosphatidylinositol 4,5-bisphosphate 3-kinase 110 kDa catalytic subunit beta
Short name:
PtdIns-3-kinase subunit p110-beta
Short name:
p110beta
Gene namesi
Name:Pik3cb
OrganismiMus musculus (Mouse)
Taxonomic identifieri10090 [NCBI]
Taxonomic lineageiEukaryotaMetazoaChordataCraniataVertebrataEuteleostomiMammaliaEutheriaEuarchontogliresGliresRodentiaMyomorphaMuroideaMuridaeMurinaeMusMus
Proteomesi
  • UP000000589 Componenti: Chromosome 9

Organism-specific databases

MGIiMGI:1922019 Pik3cb

Subcellular locationi

Extracellular region or secreted Cytosol Plasma membrane Cytoskeleton Lysosome Endosome Peroxisome ER Golgi apparatus Nucleus Mitochondrion Manual annotation Automatic computational assertionGraphics by Christian Stolte; Source: COMPARTMENTS

Keywords - Cellular componenti

Cytoplasm, Nucleus

Pathology & Biotechi

Disruption phenotypei

Mice have defects in autophagosome formation. Have normal bleeding time but are resistant to thrombosis after arterial injury. Mice fail to induce tumors in a model of prostate tumor formation induced by Pten loss.4 Publications

PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
ChainiPRO_00000887881 – 1064Phosphatidylinositol 4,5-bisphosphate 3-kinase catalytic subunit beta isoformAdd BLAST1064

Amino acid modifications

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Modified residuei318PhosphoserineCombined sources1
Modified residuei1064Phosphoserine; by autocatalysisBy similarity1

Post-translational modificationi

Phosphorylation at Ser-1064 down-regulates lipid kinase activity.By similarity

Keywords - PTMi

Phosphoprotein

Proteomic databases

MaxQBiQ8BTI9
PaxDbiQ8BTI9
PRIDEiQ8BTI9

PTM databases

iPTMnetiQ8BTI9
PhosphoSitePlusiQ8BTI9

Expressioni

Gene expression databases

BgeeiENSMUSG00000032462
ExpressionAtlasiQ8BTI9 baseline and differential
GenevisibleiQ8BTI9 MM

Interactioni

Subunit structurei

Heterodimer of a catalytic subunit PIK3CB and a p85 regulatory subunit (PIK3R1, PIK3R2 or PIK3R3). Interaction with PIK3R2 is required for nuclear localization and nuclear export (By similarity). Part of a complex with PIK3R1 and PTEN (By similarity). Binding to PTEN may antagonize the lipid kinase activity under normal growth conditions (By similarity). Part of a complex involved in autophagosome formation composed of PIK3C3 and PIK3R4. Interacts with BECN1, ATG14 and RAB5A.By similarity1 Publication

Binary interactionsi

Show more details

GO - Molecular functioni

  • insulin receptor substrate binding Source: MGI

Protein-protein interaction databases

BioGridi217006, 5 interactors
DIPiDIP-49395N
IntActiQ8BTI9, 17 interactors
STRINGi10090.ENSMUSP00000035037

Chemistry databases

BindingDBiQ8BTI9

Structurei

Secondary structure

11064
Legend: HelixTurnBeta strandPDB Structure known for this area
Show more details
Feature keyPosition(s)DescriptionActionsGraphical viewLength
Beta strandi22 – 29Combined sources8
Beta strandi35 – 41Combined sources7
Helixi46 – 56Combined sources11
Helixi57 – 59Combined sources3
Turni61 – 64Combined sources4
Helixi69 – 71Combined sources3
Beta strandi72 – 81Combined sources10
Beta strandi83 – 85Combined sources3
Beta strandi91 – 93Combined sources3
Helixi94 – 96Combined sources3
Beta strandi98 – 101Combined sources4
Beta strandi103 – 108Combined sources6
Helixi118 – 124Combined sources7
Helixi129 – 133Combined sources5
Helixi137 – 159Combined sources23
Helixi164 – 169Combined sources6
Helixi178 – 180Combined sources3
Helixi182 – 185Combined sources4
Beta strandi186 – 189Combined sources4
Beta strandi191 – 199Combined sources9
Beta strandi204 – 208Combined sources5
Helixi215 – 227Combined sources13
Helixi237 – 239Combined sources3
Beta strandi240 – 244Combined sources5
Beta strandi253 – 255Combined sources3
Turni257 – 259Combined sources3
Helixi261 – 268Combined sources8
Beta strandi274 – 279Combined sources6
Helixi280 – 295Combined sources16
Beta strandi325 – 334Combined sources10
Beta strandi347 – 353Combined sources7
Beta strandi356 – 359Combined sources4
Helixi369 – 371Combined sources3
Beta strandi377 – 384Combined sources8
Turni385 – 387Combined sources3
Beta strandi393 – 398Combined sources6
Beta strandi433 – 440Combined sources8
Beta strandi449 – 454Combined sources6
Beta strandi465 – 467Combined sources3
Beta strandi484 – 489Combined sources6
Beta strandi493 – 495Combined sources3
Helixi502 – 513Combined sources12
Helixi529 – 536Combined sources8
Helixi546 – 554Combined sources9
Helixi556 – 562Combined sources7
Helixi564 – 566Combined sources3
Helixi567 – 570Combined sources4
Helixi579 – 590Combined sources12
Helixi597 – 600Combined sources4
Helixi601 – 604Combined sources4
Helixi611 – 621Combined sources11
Helixi626 – 629Combined sources4
Helixi633 – 642Combined sources10
Beta strandi644 – 647Combined sources4
Helixi649 – 660Combined sources12
Helixi662 – 673Combined sources12
Beta strandi675 – 678Combined sources4
Turni679 – 681Combined sources3
Helixi682 – 695Combined sources14
Turni697 – 699Combined sources3
Helixi700 – 723Combined sources24
Turni724 – 726Combined sources3
Helixi729 – 740Combined sources12
Helixi743 – 749Combined sources7
Beta strandi750 – 753Combined sources4
Beta strandi758 – 762Combined sources5
Helixi767 – 769Combined sources3
Beta strandi780 – 784Combined sources5
Turni787 – 789Combined sources3
Beta strandi795 – 802Combined sources8
Helixi805 – 823Combined sources19
Beta strandi835 – 839Combined sources5
Beta strandi842 – 846Combined sources5
Beta strandi849 – 853Combined sources5
Helixi854 – 858Combined sources5
Beta strandi859 – 861Combined sources3
Turni867 – 870Combined sources4
Helixi874 – 882Combined sources9
Helixi886 – 908Combined sources23
Beta strandi918 – 922Combined sources5
Beta strandi927 – 929Combined sources3
Helixi942 – 944Combined sources3
Helixi956 – 962Combined sources7
Turni963 – 965Combined sources3
Helixi970 – 989Combined sources20
Helixi991 – 1000Combined sources10
Helixi1001 – 1003Combined sources3
Helixi1012 – 1015Combined sources4
Helixi1016 – 1021Combined sources6
Turni1022 – 1025Combined sources4
Helixi1028 – 1044Combined sources17
Helixi1046 – 1058Combined sources13

3D structure databases

Select the link destinations:
PDBei
RCSB PDBi
PDBji
Links Updated
PDB entryMethodResolution (Å)ChainPositionsPDBsum
2Y3AX-ray3.30A1-1064[»]
4BFRX-ray2.80A/B114-1064[»]
ProteinModelPortaliQ8BTI9
SMRiQ8BTI9
ModBaseiSearch...
MobiDBiSearch...

Family & Domainsi

Domains and Repeats

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Domaini20 – 109PI3K-ABDPROSITE-ProRule annotationAdd BLAST90
Domaini188 – 279PI3K-RBDPROSITE-ProRule annotationAdd BLAST92
Domaini323 – 490C2 PI3K-typePROSITE-ProRule annotationAdd BLAST168
Domaini518 – 695PIK helicalPROSITE-ProRule annotationAdd BLAST178
Domaini794 – 1061PI3K/PI4KPROSITE-ProRule annotationAdd BLAST268

Motif

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Motifi404 – 412Nuclear localization signal (NLS)By similarity9

Domaini

The inhibitory interactions with PIK3R1 are mediated by the PI3K-ABD domain and the C2 PI3K-type domain with the iSH2 (inter-SH2) region of PIK3R1; the C2 PI3K-type domain, the PI3K helical domain, and the PI3K/PI4K kinase domain with the nSH2 (N-terminal SH2) region of PIK3R1; and the PI3K/PI4K kinase domain with the cSH2 (C-terminal SH2) region of PIK3R1. The inhibitory interaction between the PI3K-ABD domain and the C2 PI3K-type domain with the iSH2 (inter-SH2) region of PIK3R1 is weak. The nuclear localization signal (NLS) is required for its function in cell survival (By similarity).By similarity

Sequence similaritiesi

Belongs to the PI3/PI4-kinase family.PROSITE-ProRule annotation

Phylogenomic databases

eggNOGiKOG0904 Eukaryota
COG5032 LUCA
GeneTreeiENSGT00760000119110
HOGENOMiHOG000252911
HOVERGENiHBG052721
InParanoidiQ8BTI9
KOiK00922
OMAiSLNWASH
OrthoDBiEOG091G027R
TreeFamiTF102031

Family and domain databases

CDDicd05173 PI3Kc_IA_beta, 1 hit
Gene3Di1.10.1070.11, 1 hit
2.60.40.150, 2 hits
InterProiView protein in InterPro
IPR016024 ARM-type_fold
IPR035892 C2_domain_sf
IPR011009 Kinase-like_dom_sf
IPR000403 PI3/4_kinase_cat_dom
IPR036940 PI3/4_kinase_cat_sf
IPR018936 PI3/4_kinase_CS
IPR003113 PI3K_adapt-bd_dom
IPR002420 PI3K_C2_dom
IPR000341 PI3K_Ras-bd_dom
IPR008290 PI3K_Vps34
IPR037702 PI3Kbeta_dom
IPR015433 PI_Kinase
IPR001263 PInositide-3_kin_accessory_dom
IPR029071 Ubiquitin-like_domsf
PANTHERiPTHR10048 PTHR10048, 1 hit
PfamiView protein in Pfam
PF00454 PI3_PI4_kinase, 1 hit
PF00792 PI3K_C2, 1 hit
PF02192 PI3K_p85B, 1 hit
PF00794 PI3K_rbd, 1 hit
PF00613 PI3Ka, 1 hit
PIRSFiPIRSF000587 PI3K_Vps34, 1 hit
SMARTiView protein in SMART
SM00142 PI3K_C2, 1 hit
SM00143 PI3K_p85B, 1 hit
SM00144 PI3K_rbd, 1 hit
SM00145 PI3Ka, 1 hit
SM00146 PI3Kc, 1 hit
SUPFAMiSSF48371 SSF48371, 1 hit
SSF54236 SSF54236, 1 hit
SSF56112 SSF56112, 1 hit
PROSITEiView protein in PROSITE
PS00915 PI3_4_KINASE_1, 1 hit
PS00916 PI3_4_KINASE_2, 1 hit
PS50290 PI3_4_KINASE_3, 1 hit
PS51544 PI3K_ABD, 1 hit
PS51547 PI3K_C2, 1 hit
PS51546 PI3K_RBD, 1 hit
PS51545 PIK_HELICAL, 1 hit

Sequencei

Sequence statusi: Complete.

Q8BTI9-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30         40         50
MPPAMADNLD IWAVDSQIAS DGAISVDFLL PTGIYIQLEV PREATISYIK
60 70 80 90 100
QMLWKQVHNY PMFNLLMDID SYMFACVNQT AVYEELEDET RRLCDVRPFL
110 120 130 140 150
PVLKLVTRSC DPAEKLDSKI GVLIGKGLHE FDALKDPEVN EFRRKMRKFS
160 170 180 190 200
EAKIQSLVGL SWIDWLKHTY PPEHEPSVLE NLEDKLYGGK LVVAVHFENS
210 220 230 240 250
QDVFSFQVSP NLNPIKINEL AIQKRLTIRG KEDEASPCDY VLQVSGRVEY
260 270 280 290 300
VFGDHPLIQF QYIRNCVMNR TLPHFILVEC CKIKKMYEQE MIAIEAAINR
310 320 330 340 350
NSSNLPLPLP PKKTRVISHI WDNNNPFQIT LVKGNKLNTE ETVKVHVRAG
360 370 380 390 400
LFHGTELLCK TVVSSEISGK NDHIWNEQLE FDINICDLPR MARLCFAVYA
410 420 430 440 450
VLDKVKTKKS TKTINPSKYQ TIRKAGKVHY PVAWVNTMVF DFKGQLRSGD
460 470 480 490 500
VILHSWSSFP DELEEMLNPM GTVQTNPYAE NATALHITFP ENKKQPCYYP
510 520 530 540 550
PFDKIIEKAA ELASGDSANV SSRGGKKFLA VLKEILDRDP LSQLCENEMD
560 570 580 590 600
LIWTLRQDCR ENFPQSLPKL LLSIKWNKLE DVAQLQALLQ IWPKLPPREA
610 620 630 640 650
LELLDFNYPD QYVREYAVGC LRQMSDEELS QYLLQLVQVL KYEPFLDCAL
660 670 680 690 700
SRFLLERALD NRRIGQFLFW HLRSEVHTPA VSVQFGVILE AYCRGSVGHM
710 720 730 740 750
KVLSKQVEAL NKLKTLNSLI KLNAVKLSRA KGKEAMHTCL KQSAYREALS
760 770 780 790 800
DLQSPLNPCV ILSELYVEKC KYMDSKMKPL WLVYSSRAFG EDSVGVIFKN
810 820 830 840 850
GDDLRQDMLT LQMLRLMDLL WKEAGLDLRM LPYGCLATGD RSGLIEVVST
860 870 880 890 900
SETIADIQLN SSNVAATAAF NKDALLNWLK EYNSGDDLDR AIEEFTLSCA
910 920 930 940 950
GYCVASYVLG IGDRHSDNIM VKKTGQLFHI DFGHILGNFK SKFGIKRERV
960 970 980 990 1000
PFILTYDFIH VIQQGKTGNT EKFGRFRQCC EDAYLILRRH GNLFITLFAL
1010 1020 1030 1040 1050
MLTAGLPELT SVKDIQYLKD SLALGKSEEE ALKQFKQKFD EALRESWTTK
1060
VNWMAHTVRK DYRS
Length:1,064
Mass (Da):121,711
Last modified:July 27, 2011 - v2
Checksum:iEBDF0266BF0A2032
GO

Experimental Info

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Sequence conflicti123L → R in BAC41102 (PubMed:16141072).Curated1

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
AK090116 mRNA Translation: BAC41102.1
AK154106 mRNA Translation: BAE32380.1
CH466560 Genomic DNA Translation: EDL20998.1
CCDSiCCDS23432.1
RefSeqiNP_083370.2, NM_029094.3
XP_011241131.1, XM_011242829.2
XP_011241132.1, XM_011242830.2
UniGeneiMm.213128

Genome annotation databases

EnsembliENSMUST00000035037; ENSMUSP00000035037; ENSMUSG00000032462
GeneIDi74769
KEGGimmu:74769
UCSCiuc009rdv.2 mouse

Similar proteinsi

Entry informationi

Entry nameiPK3CB_MOUSE
AccessioniPrimary (citable) accession number: Q8BTI9
Secondary accession number(s): Q3U4Q1
Entry historyiIntegrated into UniProtKB/Swiss-Prot: June 7, 2005
Last sequence update: July 27, 2011
Last modified: March 28, 2018
This is version 132 of the entry and version 2 of the sequence. See complete history.
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programChordata Protein Annotation Program

Miscellaneousi

Keywords - Technical termi

3D-structure, Complete proteome, Reference proteome
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Main funding by: National Institutes of Health