Amiloidni prekursorski protein

Amiloidni prekursorski protein (APP) je integralni membranski protein eksprimiran u mnogim tkivima i koncentriran u sinapsama neurona. Funkcioniše kao receptor ćelijske površine[5] i impliciran je kao regulator formiranja sinapsi,[6] plastičnost,[7] antimikrobu aktivnost,[8] i eksport gvožđa.[9] Kodiran je genom APP i reguliran prezentacijom supstrata.[10] APP je najpoznatiji kao prekursorska molekula čija proteoliza stvara amiloid beta (Aβ), polipeptid koji sadrži 37 do 49 aminokiselinskih ostataka, čiji amiloidni vlaknasti oblik je primarna komponenta amiloidnog plaka koji se nalazi u mozgu pacijenata s Alzheimerovom bolešću.

APP
Dostupne strukture
PDBPretraga ortologa: PDBe RCSB
Spisak PDB ID kodova

1AAP, 1AMB, 1AMC, 1AML, 1BA4, 1BA6, 1BJB, 1BJC, 1BRC, 1CA0, 1HZ3, 1IYT, 1MWP, 1OWT, 1QCM, 1QWP, 1QXC, 1QYT, 1TAW, 1TKN, 1X11, 1Z0Q, 1ZJD, 2BEG, 2BP4, 2FJZ, 2FK1, 2FK2, 2FK3, 2FKL, 2FMA, 2G47, 2IPU, 2LFM, 2LLM, 2LMN, 2LMO, 2LMP, 2LMQ, 2LOH, 2LP1, 2OTK, 2R0W, 2WK3, 2Y29, 2Y2A, 2Y3J, 2Y3K, 2Y3L, 3AYU, 3DXC, 3DXD, 3DXE, 3GCI, 3IFL, 3IFN, 3IFO, 3IFP, 3JTI, 3KTM, 3L33, 3L81, 3MOQ, 3NYL, 3SV1, 3U0T, 3UMH, 3UMI, 3UMK, 4HIX, 1ZE7, 1ZE9, 2LNQ, 2LZ3, 2LZ4, 2M4J, 2M9R, 2M9S, 2MGT, 2MJ1, 2MPZ, 2MVX, 2MXU, 3BAE, 3BKJ, 3JQ5, 3JQL, 3MXC, 3NYJ, 3OVJ, 3OW9, 4JFN, 4M1C, 4MDR, 4NGE, 4OJF, 4ONF, 4ONG, 4PQD, 4PWQ, 4MVI, 4MVK, 4MVL, 4XXD, 5CSZ, 5AMB, 5AEF, 5AM8, 5BUO, 5HOY, 5HOW, 5HOX, 5KK3, 5C67, 2NAO

Identifikatori
AliasiAPP
Vanjski ID-jeviOMIM: 104760 MGI: 88059 HomoloGene: 56379 GeneCards: APP
Lokacija gena (čovjek)
Hromosom 21 (čovjek)
Hrom.Hromosom 21 (čovjek)[1]
Hromosom 21 (čovjek)
Genomska lokacija za APP
Genomska lokacija za APP
Bend21q21.3Početak25,880,550 bp[1]
Kraj26,171,128 bp[1]
Lokacija gena (miš)
Hromosom 16 (miš)
Hrom.Hromosom 16 (miš)[2]
Hromosom 16 (miš)
Genomska lokacija za APP
Genomska lokacija za APP
Bend16 C3.3|16 46.92 cMPočetak84,746,573 bp[2]
Kraj84,970,654 bp[2]
Obrazac RNK ekspresije




Više referentnih podataka o ekspresiji
Ontologija gena
Molekularna funkcija heparin binding
signaling receptor binding
acetylcholine receptor binding
vezivanje iona metala
vezivanje enzima
peptidase activator activity
peptidase inhibitor activity
GO:0001948, GO:0016582 vezivanje za proteine
vezivanje sa DNK
growth factor receptor binding
PTB domain binding
serine-type endopeptidase inhibitor activity
vezivanje identičnih proteina
transition metal ion binding
signaling receptor activator activity
Ćelijska komponenta citoplazma
endozom
citosol
trans-Golgi network membrane
membrana
cell-cell junction
sinapsa
extracellular region
ciliary rootlet
spindle midzone
neuron projection
rough endoplasmic reticulum
dendritična kičma
endosome lumen
dendritic shaft
cell surface
terminal bouton
Lipidni splav
Egzosom
integral component of membrane
Golđijev aparat
growth cone
Nervno-mišićna veza
receptor complex
ćelijska membrana
apical part of cell
astrocyte projection
growth cone lamellipodium
Akson
nuclear envelope lumen
clathrin-coated pit
platelet alpha granule lumen
integral component of plasma membrane
main axon
smooth endoplasmic reticulum
COPII-coated ER to Golgi transport vesicle
growth cone filopodium
GO:0016023 citoplazmatska vezikula
Vanćelijsko
Golgi lumen
perinuklearno područje citoplazme
early endosome
endoplasmic reticulum lumen
Golgi-associated vesicle
projekcija ćelije
perikaryon
presynaptic active zone
reciklirajući endosom
jedro
Sinapsna vezikula
Biološki proces cellular response to nerve growth factor stimulus
amyloid fibril formation
negative regulation of neuron differentiation
neuromuscular process controlling balance
protein phosphorylation
regulation of epidermal growth factor-activated receptor activity
cellular copper ion homeostasis
neuron projection development
cellular response to cAMP
suckling behavior
GO:0097285 apoptoza
locomotory behavior
adult locomotory behavior
positive regulation of mitotic cell cycle
axo-dendritic transport
GO:0001306 response to oxidative stress
mRNA polyadenylation
collateral sprouting in absence of injury
ionotropic glutamate receptor signaling pathway
Notch signaling pathway
negative regulation of peptidase activity
smooth endoplasmic reticulum calcium ion homeostasis
synaptic assembly at neuromuscular junction
neuron remodeling
dendrite development
extracellular matrix organization
cholesterol metabolic process
mating behavior
cellular response to norepinephrine stimulus
nervous system development
Ćelijska adhezija
response to lead ion
Regulacija ekspresije gena
positive regulation of G2/M transition of mitotic cell cycle
axon midline choice point recognition
visual learning
Endocitoza
axonogenesis
regulation of multicellular organism growth
platelet degranulation
positive regulation of peptidase activity
forebrain development
regulation of protein binding
regulation of translation
regulation of synapse structure or activity
GO:0006928 cellular process or phenomenon
GO:0003257, GO:0010735, GO:1901228, GO:1900622, GO:1904488 positive regulation of transcription by RNA polymerase II
negative regulation of endopeptidase activity
response to yeast
antibacterial humoral response
antifungal humoral response
Urođeni imunski sistem
GO:0051636 defense response to Gram-negative bacterium
GO:0051637 defense response to Gram-positive bacterium
neuron apoptotic process
positive regulation of protein phosphorylation
astrocyte activation involved in immune response
G protein-coupled receptor signaling pathway
learning or memory
Učenje
negative regulation of cell population proliferation
response to radiation
GO:1901313 positive regulation of gene expression
negative regulation of gene expression
positive regulation of peptidyl-threonine phosphorylation
microglia development
regulation of Wnt signaling pathway
positive regulation of protein binding
tumor necrosis factor production
positive regulation of peptidyl-serine phosphorylation
positive regulation of phosphorylation
Posttranslacione modifikacije
positive regulation of JNK cascade
astrocyte activation
regulation of long-term neuronal synaptic plasticity
regulation of peptidyl-tyrosine phosphorylation
synapse organization
kognitivna funkcija
positive regulation of DNA-binding transcription factor activity
positive regulation of NF-kappaB transcription factor activity
positive regulation of astrocyte activation
positive regulation of ERK1 and ERK2 cascade
cellular response to copper ion
cellular response to manganese ion
modulation of excitatory postsynaptic potential
regulation of spontaneous synaptic transmission
negative regulation of long-term synaptic potentiation
positive regulation of long-term synaptic potentiation
positive regulation of NIK/NF-kappaB signaling
positive regulation of amyloid-beta formation
positive regulation of microglial cell activation
cellular response to amyloid-beta
negative regulation of low-density lipoprotein receptor activity
regulation of presynapse assembly
positive regulation of amyloid fibril formation
neuron projection maintenance
positive regulation of signaling receptor activity
regulation of NMDA receptor activity
positive regulation of T cell migration
response to interleukin-1
positive regulation of glycolytic process
Izvori:Amigo / QuickGO
Ortolozi
VrsteČovjekMiš
Entrez
Ensembl
UniProt
RefSeq (mRNK)
NM_201414
NM_000484
NM_001136016
NM_001136129
NM_001136130

NM_001136131
NM_001204301
NM_001204302
NM_001204303
NM_201413
NM_001385253

NM_001198823
NM_001198824
NM_001198825
NM_001198826
NM_007471

RefSeq (bjelančevina)
NP_000475
NP_001129488
NP_001129601
NP_001129602
NP_001129603

NP_001191230
NP_001191231
NP_001191232
NP_958816
NP_958817

NP_001185752
NP_001185753
NP_001185754
NP_001185755
NP_031497

Lokacija (UCSC)Chr 21: 25.88 – 26.17 MbChr 16: 84.75 – 84.97 Mb
PubMed pretraga[3][4]
Wikipodaci
Pogledaj/uredi – čovjekPogledaj/uredi – miš
Mehanizam formiranja amiloidnih fibrila
Metabolizam APP putem enzima sekretaza[5][6]

Genetika

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Amiloid-beta prekursorski protein je drevna i visoko konzervirani protein.[11] U ljudi, gen APP nalazi se na hromosomu 21 i sadrži 18 egzona koji obuhvataju 290 kilobaza.[12][13] Kod ljudi primijećeno je nekoliko alternativno prerađenih izoformi APP-a, u rasponu dužine od 639 do 770 aminokiselina, s određenim izoformama prvenstveno eksprimiranim u neuronima; promjene u neuronskom omjeru ovih izoformi povezane su s Alzhheimerovom bolešću.[14] Homologni proteini identifikovani su u drugim organizmima kao što su u rodu Drosophila (vinske mušice), C. elegans (oble gliste),[15] i svi sisari.[16] Amiloidna beta regija proteina, koja se nalazi u domenu koji se prostire na membrani, nije dobro konzervirana među vrstama i nema očiglednu vezu sa biološkim funkcijama APP-a u nativnom stanju.[16]

Mutacije u kritičnim regijama amiloidnog prekursora proteina, uključujući regiju koja stvara amiloid-beta (Aβ), uzrokuju porodičnu osjetljivost na Alzheimerovu bolest.[17][18][19][20] Naprimjer, otkriveno je da nekoliko mutacija izvan Aβ regije povezanih s porodičnom Alzhejmerovom bolešću dramatično povećava proizvodnju Aβ.[21]

Mutacija A673T u APP genu štiti od Alzheimerove bolesti. Ova zamjena je u blizini mjesta cijepanja beta sekretaze i rezultira smanjenjem od 40% u stvaranju beta amiloida in vitro.[22]

Aminokiselinska sekvenca

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Dužina polipeptidnog lanca je 770 aminokiselina, a molekulska težina 86.943 Da.[5]

1020304050
MLPGLALLLLAAWTARALEVPTDGNAGLLAEPQIAMFCGRLNMHMNVQNG
KWDSDPSGTKTCIDTKEGILQYCQEVYPELQITNVVEANQPVTIQNWCKR
GRKQCKTHPHFVIPYRCLVGEFVSDALLVPDKCKFLHQERMDVCETHLHW
HTVAKETCSEKSTNLHDYGMLLPCGIDKFRGVEFVCCPLAEESDNVDSAD
AEEDDSDVWWGGADTDYADGSEDKVVEVAEEEEVAEVEEEEADDDEDDED
GDEVEEEAEEPYEEATERTTSIATTTTTTTESVEEVVREVCSEQAETGPC
RAMISRWYFDVTEGKCAPFFYGGCGGNRNNFDTEEYCMAVCGSAMSQSLL
KTTQEPLARDPVKLPTTAASTPDAVDKYLETPGDENEHAHFQKAKERLEA
KHRERMSQVMREWEEAERQAKNLPKADKKAVIQHFQEKVESLEQEAANER
QQLVETHMARVEAMLNDRRRLALENYITALQAVPPRPRHVFNMLKKYVRA
EQKDRQHTLKHFEHVRMVDPKKAAQIRSQVMTHLRVIYERMNQSLSLLYN
VPAVAEEIQDEVDELLQKEQNYSDDVLANMISEPRISYGNDALMPSLTET
KTTVELLPVNGEFSLDDLQPWHSFGADSVPANTENEVEPVDARPAADRGL
TTRPGSGLTNIKTEEISEVKMDAEFRHDSGYEVHHQKLVFFAEDVGSNKG
AIIGLMVGGVVIATVIVITLVMLKKKQYTSIHHGVVEVDAAVTPEERHLS
KMQQNGYENPTYKFFEQMQN

Struktura

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Metal-vezujući domen APP sa vezanim bakarnin ionom. Bočni lanac dva ostatka histidina i jednog tirozina koji imaju ulogu u koordinaciji metala prikazani su u vezanim Cu(I), vezanim Cu(II) i nevezanim konformacijama, koji se razlikuju samo po malim promjenama u orijentaciji.
 
Vanćelijski E2 domen, dimerna upredena zavojnica i jedan od najkonzerviranijih regiona proteina od Drosophila do ljudi. Smatra se da ovaj domen, koji liči na strukturu spektrina, veže heparan-sulfatne proteoglikane.[23]

U APP sekvenci je identifikovan niz različitih, uglavnom nezavisno-sklopljenih strukturnih domena. Vanćelijska regija, mnogo veću od unutarćelijske regije, podijeljena je na E1 i E2 domene, povezane kiselim domenom (AcD); E1 sadrži dva poddomena uključujući domen sličan faktoru rasta (GFLD) i bakar-vezujući domen (CuBD) koji međusobno čvrsto djeluju.[24] Domen inhibitora serinske proteaze, odsutan iz izoforme različito eksprimirane u mozgu, nalazi se između kiselog područja i E2 domena.[25] Kompletna kristalna struktura APP-a još nije riješena. Međutim, pojedinačni domeni su uspješno kristalizirani poput: domen sličan faktoru rasta,[26], domena koja veže bakar[27] kompletna E1 domena[24] i domen E2.[23]

Funkcija

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Iako je izvorna biološka uloga APP-a od očiglednog interesa za istraživanje Alzheimerove bolesti, temeljito razumijevanje je ostalo nedostižno.

Formiranje i popravak sinapsi

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Najvažnija uloga APP-a je u m formiranju i popravljanju sinapsi;[6] njegova ekspresija je nadregulirana tokom neuronske diferencijacije i nakon nervne ozljede. Uloge u ćelijskoj signalizaciji, dugotrajnoj potenciaciji i ćelijskoj adheziji predložene su i podržane još ograničenim istraživanjem.[16] Konkretno, sličnosti u posttranslacijskoj obradi pozvali su na poređenja sa signalnom ulogom površinskog receptorskog proteina Notch.[28]

APP nokaut-miševi su održivi i imaju relativno male fenotipske efekte, uključujući oštećeno dugotrajno potenciranje i gubitak pamćenja bez općeg gubitka neurona.[29] S druge strane, zabilježeno je da transgeni miševi s povećanom ekspresijom APP-a pokazuju smanjenu dugotrajnu potencijaciju.[30]

Logičan zaključak je da bi, budući da se Aβ prekomjerno akumulira kod Alzheimerove bolesti, njegov prekursor, APP, također bio povišen. Međutim, tijela neuronskih ćelija sadrže manje APP kao funkciju njihove blizine amiloidnim plakovima.[31] Podaci pokazuju da je ovaj deficit u APP-u posljedica pada proizvodnje, a ne povećanja katalize. Gubitak APP neurona može uticati na fiziološke deficite koji doprinose demenciji.

Somatska rekombinacija

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U neuronima ljudskog mozga, u genu koji kodira APP česta je somatska rekombinacija.[32] Neuroni osoba sa sporadičnom Alzheimmerovom bolešću pokazuju veću raznolikost gena APP zbog somatske rekombinacije nego neuroni zdravih osoba.[32]

Anterogradni neuronski transport

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Molekule sintetizirane u ćelijskim tijelima neurona moraju se prenijeti prema van do distalnih sinapsi. Ovo se postiže putem brzog anterogradnog transporta. Utvrđeno je da APP može posredovati u interakciji između tereta i kinezina i na taj način olakšati ovaj transport. Konkretno, kratka peptidna sekvenca od 15 aminokiselina sa citoplazmatskog karboksi-terminala neophodna je za interakciju sa motornim proteinom.[33]

Dodatno, pokazalo se da je interakcija između APP i kinezina specifična za peptidnu sekvencu APP-a.[34] U nedavnom eksperimentu koji je uključivao transport obojenih kuglica, kontrole su konjugirane na jednu aminokiselinu, glicin, tako da pokazuju istu terminalnu grupu karboksilne kiseline kao APP bez intervencije gorepomenute 15-aminokiselinske sekvenca. Kontrolne kuglice nisu bile pokretne, što je pokazalo da terminalni COOH dio peptida nije dovoljan da posreduje u transportu.

Eksport gvožđa

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Drugačiju perspektivu na Alzheimerovu bolest otkriva studija na mišu koja je otkrila da APP posjeduje feroksidaznu aktivnost sličnu ceruloplazminu, olakšavajući metabolizam i eksport gvožđa kroz interakciju sa feroportinom; čini se da je ova aktivnost blokirana cinkom zarobljenim akumuliranim Aβ kod Alzheimerove bolesti.[9] Pokazalo se da jednonukleotidni polimorfizam u 5' UTR-u APP iRNK može poremetiti njegovu translaciju.[35]

Hipoteza da APP ima aktivnost feroksidaze u domenu E2 i olakšava eksport Fe(II) je vjerovatno netačna jer predloženo mjesto feroksidaze APP u E2 domenu nema aktivnost feroksidaze.[36][37]

Kako APP ne posjeduje aktivnost feroksidaze unutar svog E2 domena, mehanizam APP-moduliranog efluksa gvožđa iz feroportina bio je pod kontrolom. Jedan model sugerira da APP djeluje na stabilizaciju proteina feroportina koji izlijeva gvožđe u ćelijskim plazmamembranama, čime se povećava ukupan broj feroportinskih molekula na membrani. Ovi transporteri gvožđa se zatim mogu aktivirati poznatim feroksidazama sisara (tj. ceruloplazminom ili hefestinom).[38]

Hormonska regulacija

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Amiloid-β prekursorski protein (AβPP), i sve povezane sekretaze, eksprimiraju se u ranoj fazi razvoja i imaju ključnu ulogu u endokrinologiji reprodukcije – uz diferencijalnu obradu AβPP sekretazama koje regulišu proliferaciju ljudskih embrionskih matičnih ćelija (hESC) kao i njihovu diferencijaciju u nervne prekursorske ćelije (NPC). Hormon trudnoće ljudski horionski gonadotropin (hCG) povećava ekspresiju AβPP [39] i proliferaciju hESC-a, dok progesteron usmjerava preradu AβPP prema neamiloidogenom putu, koji promovira diferencijaciju hESC-a u NPC.[40][41][42]

AβPP i njegovi proizvodi cijepanja ne promovišu proliferaciju i diferencijaciju postmitotskih neurona; prije će biti da prekomjerna ekspresija bilo divljeg tipa ili mutantnog AβPP u postmitotskim neuronima inducira apoptozhnu smrt nakon njihovog ponovnog ulaska u ćelijski ciklus.[43] Pretpostavlja se da je gubitak spolnih steroida (uključujući progesteron), ali i povećanje razine luteinizirajućeg hormona, ekvivalent hCG-a za odrasle, nakon menopauze i tokom andropauze pokreće proizvodnju amiloida-β[44] i ponovni ulazak postmitotskih neurona u ćelijski ciklus.

Interakcije

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Pokazalo se da protein prekursor amiloida reaguje sa:

APP stupa u interakciju i s reelinom, proteinom koji je uključen u brojne poremećaje mozga, uključujući Alzheimerovu bolest.[65]

Reference

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