Transkripcijski regulator ATRX

(Preusmjereno sa ATRX)

Transkripcijski regulator ATRX znan i kao ATP-ovisna helikaza ATRX, X-vezana helikaza II, ili X-vezani jedarni protein (XNP) jest protein koji je kod ljudi kodiran genom ATRX sa hromosoma X.[5][6][7]

Transkripcijski regulator ATRX
Dostupne strukture
PDBPretraga ortologa: PDBe RCSB
Spisak PDB ID kodova

2JM1, 2LBM, 2LD1, 3QL9, 3QLA, 3QLC, 3QLN, 4W5A

Identifikatori
AliasiATRX
Vanjski ID-jeviOMIM: 300032 MGI: 103067 HomoloGene: 416 GeneCards: ATRX
Lokacija gena (čovjek)
Hromosom X
Hrom.Hromosom X[1]
Hromosom X
Genomska lokacija za Transkripcijski regulator ATRX
Genomska lokacija za Transkripcijski regulator ATRX
BendXq21.1Početak77,504,880 bp[1]
Kraj77,786,233 bp[1]
Lokacija gena (miš)
Hromosom X (miš)
Hrom.Hromosom X (miš)[2]
Hromosom X (miš)
Genomska lokacija za Transkripcijski regulator ATRX
Genomska lokacija za Transkripcijski regulator ATRX
BendX D|X 47.26 cMPočetak104,841,221 bp[2]
Kraj104,973,009 bp[2]
Ontologija gena
Molekularna funkcija vezivanje sa DNK
nucleotide binding
chromo shadow domain binding
GO:0008026 helicase activity
GO:0031493 histone binding
vezivanje iona metala
DNA translocase activity
methylated histone binding
GO:0004003 DNA helicase activity
GO:0001948, GO:0016582 vezivanje za proteine
hydrolase activity
ATP binding
chromatin binding
GO:0001200, GO:0001133, GO:0001201 DNA-binding transcription factor activity, RNA polymerase II-specific
Ćelijska komponenta PML body
SWI/SNF superfamily-type complex
pericentric heterochromatin
hromosom
GO:0035328 heterochromatin
nuclear chromosome
Telomera
jedro
nukleoplazma
nuclear body
Biološki proces chromatin remodeling
nucleosome assembly
DNA recombination
post-embryonic forelimb morphogenesis
GO:0009373 regulation of transcription, DNA-templated
multicellular organism growth
DNA damage response, signal transduction by p53 class mediator
positive regulation of nuclear cell cycle DNA replication
Sertoli cell development
transcription, DNA-templated
protein localization to chromosome, telomeric region
cellular response to DNA damage stimulus
positive regulation of telomeric RNA transcription from RNA pol II promoter
positive regulation of telomere maintenance
Metilacija DNK
negative regulation of telomeric RNA transcription from RNA pol II promoter
seminiferous tubule development
Spermatogeneza
replication fork processing
negative regulation of maintenance of mitotic sister chromatid cohesion, telomeric
forebrain development
GO:0100026 Popravka DNK
cellular response to hydroxyurea
GO:0003257, GO:0010735, GO:1901228, GO:1900622, GO:1904488 positive regulation of transcription by RNA polymerase II
DNA duplex unwinding
regulation of histone H3-K9 trimethylation
GO:0043147 meiotic spindle organization
GO:0051178 chromosome organization involved in meiotic cell cycle
GO:0031497, GO:0006336, GO:0034724, GO:0001301, GO:0007580, GO:0034652, GO:0010847 chromatin organization
Izvori:Amigo / QuickGO
Ortolozi
VrsteČovjekMiš
Entrez
Ensembl
UniProt
RefSeq (mRNK)

NM_000489
NM_138270
NM_138271

NM_009530

RefSeq (bjelančevina)

NP_000480
NP_612114

NP_033556

Lokacija (UCSC)Chr X: 77.5 – 77.79 MbChr X: 104.84 – 104.97 Mb
PubMed pretraga[3][4]
Wikipodaci
Pogledaj/uredi – čovjekPogledaj/uredi – miš

Aminokiselinska sekvenca uredi

Dužina polipeptidnog lanca je 2.492 aminokiseline, a molekulska težina 282.586 Da.[7]

1020304050
MTAEPMSESKLNTLVQKLHDFLAHSSEESEETSSPPRLAMNQNTDKISGS
GSNSDMMENSKEEGTSSSEKSKSSGSSRSKRKPSIVTKYVESDDEKPLDD
ETVNEDASNENSENDITMQSLPKGTVIVQPEPVLNEDKDDFKGPEFRSRS
KMKTENLKKRGEDGLHGIVSCTACGQQVNHFQKDSIYRHPSLQVLICKNC
FKYYMSDDISRDSDGMDEQCRWCAEGGNLICCDFCHNAFCKKCILRNLGR
KELSTIMDENNQWYCYICHPEPLLDLVTACNSVFENLEQLLQQNKKKIKV
DSEKSNKVYEHTSRFSPKKTSSNCNGEEKKLDDSCSGSVTYSYSALIVPK
EMIKKAKKLIETTANMNSSYVKFLKQATDNSEISSATKLRQLKAFKSVLA
DIKKAHLALEEDLNSEFRAMDAVNKEKNTKEHKVIDAKFETKARKGEKPC
ALEKKDISKSEAKLSRKQVDSEHMHQNVPTEEQRTNKSTGGEHKKSDRKE
EPQYEPANTSEDLDMDIVSVPSSVPEDIFENLETAMEVQSSVDHQGDGSS
GTEQEVESSSVKLNISSKDNRGGIKSKTTAKVTKELYVKLTPVSLSNSPI
KGADCQEVPQDKDGYKSCGLNPKLEKCGLGQENSDNEHLVENEVSLLLEE
SDLRRSPRVKTTPLRRPTETNPVTSNSDEECNETVKEKQKLSVPVRKKDK
RNSSDSAIDNPKPNKLPKSKQSETVDQNSDSDEMLAILKEVSRMSHSSSS
DTDINEIHTNHKTLYDLKTQAGKDDKGKRKRKSSTSGSDFDTKKGKSAKS
SIISKKKRQTQSESSNYDSELEKEIKSMSKIGAARTTKKRIPNTKDFDSS
EDEKHSKKGMDNQGHKNLKTSQEGSSDDAERKQERETFSSAEGTVDKDTT
IMELRDRLPKKQQASASTDGVDKLSGKEQSFTSLEVRKVAETKEKSKHLK
TKTCKKVQDGLSDIAEKFLKKDQSDETSEDDKKQSKKGTEEKKKPSDFKK
KVIKMEQQYESSSDGTEKLPEREEICHFPKGIKQIKNGTTDGEKKSKKIR
DKTSKKKDELSDYAEKSTGKGDSCDSSEDKKSKNGAYGREKKRCKLLGKS
SRKRQDCSSSDTEKYSMKEDGCNSSDKRLKRIELRERRNLSSKRNTKEIQ
SGSSSSDAEESSEDNKKKKQRTSSKKKAVIVKEKKRNSLRTSTKRKQADI
TSSSSSDIEDDDQNSIGEGSSDEQKIKPVTENLVLSSHTGFCQSSGDEAL
SKSVPVTVDDDDDDNDPENRIAKKMLLEEIKANLSSDEDGSSDDEPEEGK
KRTGKQNEENPGDEEAKNQVNSESDSDSEESKKPRYRHRLLRHKLTVSDG
ESGEEKKTKPKEHKEVKGRNRRKVSSEDSEDSDFQESGVSEEVSESEDEQ
RPRTRSAKKAELEENQRSYKQKKKRRRIKVQEDSSSENKSNSEEEEEEKE
EEEEEEEEEEEEEEDENDDSKSPGKGRKKIRKILKDDKLRTETQNALKEE
EERRKRIAEREREREKLREVIEIEDASPTKCPITTKLVLDEDEETKEPLV
QVHRNMVIKLKPHQVDGVQFMWDCCCESVKKTKKSPGSGCILAHCMGLGK
TLQVVSFLHTVLLCDKLDFSTALVVCPLNTALNWMNEFEKWQEGLKDDEK
LEVSELATVKRPQERSYMLQRWQEDGGVMIIGYEMYRNLAQGRNVKSRKL
KEIFNKALVDPGPDFVVCDEGHILKNEASAVSKAMNSIRSRRRIILTGTP
LQNNLIEYHCMVNFIKENLLGSIKEFRNRFINPIQNGQCADSTMVDVRVM
KKRAHILYEMLAGCVQRKDYTALTKFLPPKHEYVLAVRMTSIQCKLYQYY
LDHLTGVGNNSEGGRGKAGAKLFQDFQMLSRIWTHPWCLQLDYISKENKG
YFDEDSMDEFIASDSDETSMSLSSDDYTKKKKKGKKGKKDSSSSGSGSDN
DVEVIKVWNSRSRGGGEGNVDETGNNPSVSLKLEESKATSSSNPSSPAPD
WYKDFVTDADAEVLEHSGKMVLLFEILRMAEEIGDKVLVFSQSLISLDLI
EDFLELASREKTEDKDKPLIYKGEGKWLRNIDYYRLDGSTTAQSRKKWAE
EFNDETNVRGRLFIISTKAGSLGINLVAANRVIIFDASWNPSYDIQSIFR
VYRFGQTKPVYVYRFLAQGTMEDKIYDRQVTKQSLSFRVVDQQQVERHFT
MNELTELYTFEPDLLDDPNSEKKKKRDTPMLPKDTILAELLQIHKEHIVG
YHEHDSLLDHKEEEELTEEERKAAWAEYEAEKKGLTMRFNIPTGTNLPPV
SFNSQTPYIPFNLGALSAMSNQQLEDLINQGREKVVEATNSVTAVRIQPL
EDIISAVWKENMNLSEAQVQALALSRQASQELDVKRREAIYNDVLTKQQM
LISCVQRILMNRRLQQQYNQQQQQQMTYQQATLGHLMMPKPPNLIMNPSN
YQQIDMRGMYQPVAGGMQPPPLQRAPPPMRSKNPGPSQGKSM

Funkcija uredi

Transkripcijski regulator ATRX sadrži domen ATPaza/helikaza i stoga pripada SWI/SNF porodici proteina hromatinskog remodeliranja. ATRX je neophodan za taloženje histonske varijante H3.3 na telomerama i drugih genomskih ponavljanja.[8] Ove interakcije su važne za održavanje utišavanja na ovim lokusima.[9][10][11]

Osim toga, ATRX prolazi kroz fosforilacije ovisno o ćelijskom ciklusu, koje reguliraju njegovu jedarnu matricu i asocijaciju hromatina, sugerirajući njegovu uključenost u regulaciju gena u interfazi i hromosomsku segregaciju u mitozi.[7]

Klinički značaj uredi

Naslijeđene mutacije uredi

Naslijeđene mutacije gena ATRX povezane su sa X-vezanim sindromom mentalne retardacije (XLMR) sindromom koji je najčešće praćen alfa-talasemijjskim sindromom mentalne retardacije (sindrom ATR-X). Pokazalo se da ove mutacije uzrokuju različite promjene u obrascu metilacije DNK, što može potvrditi vezu između remodeliranja hromatina, metilacije DNK i ekspresije gena u razvojnim procesima. Zabilježeno je više alternativno prertađemih varijanti transkripta koje kodiraju različite izoforme. Žene nositeljice mogu pokazati iskrivljenu inaktivacija X hromosoma.[7]

Somatske mutacije uredi

Stečene mutacije u ATRX-u prijavljene su u brojnim ljudskim karcinomima, uključujući neuroendokrine tumore pankreasa,[12] gliome,[13] astrocitome,[14] osteosarkome,[15] i maligne feohromocitome.[16] Postoji jaka korelacija između ATRX mutacija i fenotipa alternativne elongacije telomera (ALT) kod karcinoma.[12]

Interakcije uredi

ATRX formira kompleks sa DAXX koji je šaperon histona H3.3.[17]

Također se pokazalo da ATRX ima interakcije sa EZH2.[18]

Tgakođer pogledajte uredi

Reference uredi

  1. ^ a b c GRCh38: Ensembl release 89: ENSG00000085224 - Ensembl, maj 2017
  2. ^ a b c GRCm38: Ensembl release 89: ENSMUSG00000031229 - Ensembl, maj 2017
  3. ^ "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  4. ^ "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  5. ^ Stayton CL, Dabovic B, Gulisano M, Gecz J, Broccoli V, Giovanazzi S, et al. (novembar 1994). "Cloning and characterization of a new human Xq13 gene, encoding a putative helicase". Human Molecular Genetics. 3 (11): 1957–64. doi:10.1093/hmg/3.11.1957. PMID 7874112.
  6. ^ Gibbons RJ, Suthers GK, Wilkie AO, Buckle VJ, Higgs DR (novembar 1992). "X-linked alpha-thalassemia/mental retardation (ATR-X) syndrome: localization to Xq12-q21.31 by X inactivation and linkage analysis". American Journal of Human Genetics. 51 (5): 1136–49. PMC 1682840. PMID 1415255.
  7. ^ a b c d "Entrez Gene: ATRX alpha thalassemia/mental retardation syndrome X-linked (RAD54 homolog, S. cerevisiae)".
  8. ^ Wong LH, McGhie JD, Sim M, Anderson MA, Ahn S, Hannan RD, et al. (mart 2010). "ATRX interacts with H3.3 in maintaining telomere structural integrity in pluripotent embryonic stem cells". Genome Research. 20 (3): 351–60. doi:10.1101/gr.101477.109. PMC 2840985. PMID 20110566.
  9. ^ Voon HP, Hughes JR, Rode C, De La Rosa-Velázquez IA, Jenuwein T, Feil R, et al. (april 2015). "ATRX Plays a Key Role in Maintaining Silencing at Interstitial Heterochromatic Loci and Imprinted Genes". Cell Reports. 11 (3): 405–18. doi:10.1016/j.celrep.2015.03.036. PMC 4410944. PMID 25865896.
  10. ^ Elsässer SJ, Noh KM, Diaz N, Allis CD, Banaszynski LA (juni 2015). "Histone H3.3 is required for endogenous retroviral element silencing in embryonic stem cells". Nature. 522 (7555): 240–4. doi:10.1038/nature14345. PMC 4509593. PMID 25938714.
  11. ^ Udugama M, M Chang FT, Chan FL, Tang MC, Pickett HA, R McGhie JD, et al. (decembar 2015). "Histone variant H3.3 provides the heterochromatic H3 lysine 9 tri-methylation mark at telomeres". Nucleic Acids Research. 43 (21): 10227–37. doi:10.1093/nar/gkv847. PMC 4666390. PMID 26304540.
  12. ^ a b Heaphy CM, de Wilde RF, Jiao Y, Klein AP, Edil BH, Shi C, et al. (juli 2011). "Altered telomeres in tumors with ATRX and DAXX mutations". Science. 333 (6041): 425. doi:10.1126/science.1207313. PMC 3174141. PMID 21719641.
  13. ^ Schwartzentruber J, Korshunov A, Liu XY, Jones DT, Pfaff E, Jacob K, et al. (januar 2012). "Driver mutations in histone H3.3 and chromatin remodelling genes in paediatric glioblastoma". Nature. 482 (7384): 226–31. doi:10.1038/nature10833. PMID 22286061. S2CID 4312169.
  14. ^ Kannan K, Inagaki A, Silber J, Gorovets D, Zhang J, Kastenhuber ER, et al. (oktobar 2012). "Whole-exome sequencing identifies ATRX mutation as a key molecular determinant in lower-grade glioma". Oncotarget. 3 (10): 1194–203. doi:10.18632/oncotarget.689. PMC 3717947. PMID 23104868.
  15. ^ Chen X, Bahrami A, Pappo A, Easton J, Dalton J, Hedlund E, et al. (april 2014). "Recurrent somatic structural variations contribute to tumorigenesis in pediatric osteosarcoma". Cell Reports. 7 (1): 104–12. doi:10.1016/j.celrep.2014.03.003. PMC 4096827. PMID 24703847.
  16. ^ Comino-Méndez, I (juni 2016). "ATRX driver mutation in a composite malignant pheochromocytoma". Cancer Genetics. 209 (6): 272–7. doi:10.1016/j.cancergen.2016.04.058. PMID 27209355.
  17. ^ Lewis PW, Elsaesser SJ, Noh KM, Stadler SC, Allis CD (august 2010). "Daxx is an H3.3-specific histone chaperone and cooperates with ATRX in replication-independent chromatin assembly at telomeres". Proceedings of the National Academy of Sciences of the United States of America. 107 (32): 14075–80. doi:10.1073/pnas.1008850107. PMC 2922592. PMID 20651253.
  18. ^ Cardoso C, Timsit S, Villard L, Khrestchatisky M, Fontès M, Colleaux L (april 1998). "Specific interaction between the XNP/ATR-X gene product and the SET domain of the human EZH2 protein". Human Molecular Genetics. 7 (4): 679–84. doi:10.1093/hmg/7.4.679. PMID 9499421.

Dopunska literatura uredi

Vanjski linkovi uredi