PIK3CA
Katalitska podjedinica alfa fosfatidilinozitol-4,5-bisfosfat 3-kinaze (službeni simbol koji je odobrila HUGO = PIK3CA; HGNC ID, HGNC:8975), zvana i protein p110α, jest protein koji je kod ljudi kodiran genom PIK3CA sa hromosoma 3. To je klasa I PI 3-kinaza, katalitskih katalitskih podjedinica. Ljudski p110α protein je kodiran ovim genom.[5]
Njegovu ulogu otkrila je molekulska patološka epidemiologija (MPE).[6]
Aminokiselinska sekvenca
urediDužina polipeptidnog lanca je 1.068 aminokiselina, а molekulska težina 124.284 Da.[7]
10 | 20 | 30 | 40 | 50 | ||||
---|---|---|---|---|---|---|---|---|
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 | LKAISTRDPL | SEITEQEKDF | ||||
LWSHRHYCVT | IPEILPKLLL | SVKWNSRDEV | AQMYCLVKDW | PPIKPEQAME | ||||
LLDCNYPDPM | VRGFAVRCLE | KYLTDDKLSQ | YLIQLVQVLK | YEQYLDNLLV | ||||
RFLLKKALTN | QRIGHFFFWH | LKSEMHNKTV | SQRFGLLLES | YCRACGMYLK | ||||
HLNRQVEAME | KLINLTDILK | QEKKDETQKV | QMKFLVEQMR | RPDFMDALQG | ||||
FLSPLNPAHQ | LGNLRLEECR | IMSSAKRPLW | LNWENPDIMS | ELLFQNNEII | ||||
FKNGDDLRQD | MLTLQIIRIM | ENIWQNQGLD | LRMLPYGCLS | IGDCVGLIEV | ||||
VRNSHTIMQI | QCKGGLKGAL | QFNSHTLHQW | LKDKNKGEIY | DAAIDLFTRS | ||||
CAGYCVATFI | LGIGDRHNSN | IMVKDDGQLF | HIDFGHFLDH | KKKKFGYKRE | ||||
RVPFVLTQDF | LIVISKGAQE | CTKTREFERF | QEMCYKAYLA | IRQHANLFIN | ||||
LFSMMLGSGM | PELQSFDDIA | YIRKTLALDK | TEQEALEYFM | KQMNDAHHGG | ||||
WTTKMDWIFH | TIKQHALN |
Funkcija
urediFosfatidilinozitol-4,5-bisfosfat 3-kinaza (takođe zvana fosfatidilinozitol 3-kinaza (PI3K)) se sastoji od 85 kDa regulatorne podjedinice i 110 kDa katalitske podjedinice . Protein kodiran ovim genom predstavlja katalitsku podjedinicu koja koristi ATP za fosforilaciju fosfatidilinozitol (PtdIns), [[fosfatidilinozitol 4-fosfat|PtdIns4P]4] i fosfatidilinozitola i PtdIns(4,5)P2.[8]
O učešću p110α u ljudskom karcinomu se pretpostavlja od 1995. Potpora za ovu hipotezu došla je iz genetilkih i funkcionalnih studija, uključujući otkriće uobičajenih aktivirajućih misens mutacija PIK3CA u uobičajenim ljudskim tumorima.[9] Utvrđeno je da je onkogena i da je upletena u rak grlića maternice.[10] Mutacije PIK3CA prisutne su u više od jedne trećine karcinoma dojke, sa obogaćenjem lumenskih i 2-pozitivnih podtipova receptora epidermnog faktora rasta (HER2+). Tri pozicije mutacije žarišnih tačaka (GLU542, GLU545 i HIS1047) su do danas naširoko prijavljivane.[11] Dok značajni pretklinički podaci pokazuju povezanost sa snažnom aktivacijom puta i rezistencijom na uobičajene terapije, klinički podaci ne ukazuju da su takve mutacije povezane s visokim razinama aktivacije puta ili s lošom prognozom. Nije poznato da li mutacija predviđa povećanu osjetljivost na agense koji ciljaju P3K put.[12]
PIK3CA učestvuje u složenoj interakciji unutar tumorskog mikrookruženja u ovom fenomenu.[13]
Klinički značaj
urediZbog povezanosti između p110α i raka,[14] to može biti odgovarajuća meta lijeka. Farmaceutske kompanije dizajniraju i karakteriziraju potencijalne inhibitore specifične za izoformu p110α.[15][16]
Prisustvo [a] PIK3CA mutacije može predvidjeti odgovor na terapiju aspirinom za kolorektumski karcinom.[17][18]
Somatske aktivirajuće mutacije u PIK3CA nalaze se u poremećajima zvanim Klippel-Trenaunayev sindrom i venska malformacija.[19][20]
PIK3CA vezani segmentni rast uključuje poremećaje mozga kao što su makrocefalija-kapilarna malformacija (MCAP) i hemimegalencefalija. Također je povezan s kongenitalnim, lipomatoznim prekomjernim rastom vaskularnih malformacija, epidermnim nevusima i skeletnim/spinalnim anomalijama (CLOVES sindrom) i fibroadipoznom hiperplazijom (FH). Stanja su uzrokovana heterozigotnim (obično somatskim mozaičnim) mutacijama.[21]
Inhibicija
urediSve PI 3-kinaze inhibiraju lijekovi wortmannin i LY294002, ali wortmannin pokazuje bolju efikasnost od LY294002 na pozicijama žarišta mutacije.[11][22]
Farmakologija
urediU septembru 2017. Copanlisib, koji inhibira pretežno p110α i p110δ, dobio je FDA odobrenje za liječenje odraslih pacijenata s relapsom folikulskog limfoma (FL) koji su primili najmanje dva prethodne sistemske terapije.[23]
Interakcije
urediPokazalo se da P110α u interakciji sa:
Također pogledajte
urediReference
uredi- ^ a b c GRCh38: Ensembl release 89: ENSG00000121879 - Ensembl, maj 2017
- ^ a b c GRCm38: Ensembl release 89: ENSMUSG00000027665 - Ensembl, maj 2017
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- ^ "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
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- ^ Liao X, Lochhead P, Nishihara R, Morikawa T, Kuchiba A, Yamauchi M, Imamura Y, Qian ZR, Baba Y, Shima K, Sun R, Nosho K, Meyerhardt JA, Giovannucci E, Fuchs CS, Chan AT, Ogino S (oktobar 2012). "Aspirin use, tumor PIK3CA mutation, and colorectal-cancer survival". The New England Journal of Medicine. 367 (17): 1596–606. doi:10.1056/nejmoa1207756. PMC 3532946. PMID 23094721.
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|journal=
(pomoć) - ^ Kumar DT, Doss CG (1. 1. 2016). "Investigating the Inhibitory Effect of Wortmannin in the Hotspot Mutation at Codon 1047 of PIK3CA Kinase Domain: A Molecular Docking and Molecular Dynamics Approach". Advances in Protein Chemistry and Structural Biology. 102: 267–97. doi:10.1016/bs.apcsb.2015.09.008. PMID 26827608.
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Dopunska literatura
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- Huang CH, Mandelker D, Schmidt-Kittler O, Samuels Y, Velculescu VE, Kinzler KW, Vogelstein B, Gabelli SB, Amzel LM (decembar 2007). "The structure of a human p110alpha/p85alpha complex elucidates the effects of oncogenic PI3Kalpha mutations". Science. 318 (5857): 1744–8. Bibcode:2007Sci...318.1744H. doi:10.1126/science.1150799. PMID 18079394. S2CID 83474940.
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