FANCL
E3 ubikvitin-protein ligaza FANCL jest enzim koji je kod ljudi kodiran genom FANCL sa p kraka hromosoma 2.[5]
Aminokiselinska sekvenca
[uredi | uredi izvor]Dužina polipeptidnog lanca je 375 aminokiselina, a molekulska težina 42.905 Da.[5]
10 | 20 | 30 | 40 | 50 | ||||
---|---|---|---|---|---|---|---|---|
MAVTEASLLR | QCPLLLPQNR | SKTVYEGFIS | AQGRDFHLRI | VLPEDLQLKN | ||||
ARLLCSWQLR | TILSGYHRIV | QQRMQHSPDL | MSFMMELKML | LEVALKNRQE | ||||
LYALPPPPQF | YSSLIEEIGT | LGWDKLVYAD | TCFSTIKLKA | EDASGREHLI | ||||
TLKLKAKYPA | ESPDYFVDFP | VPFCASWTPQ | SSLISIYSQF | LAAIESLKAF | ||||
WDVMDEIDEK | TWVLEPEKPP | RSATARRIAL | GNNVSINIEV | DPRHPTMLPE | ||||
CFFLGADHVV | KPLGIKLSRN | IHLWDPENSV | LQNLKDVLEI | DFPARAILEK | ||||
SDFTMDCGIC | YAYQLDGTIP | DQVCDNSQCG | QPFHQICLYE | WLRGLLTSRQ | ||||
SFNIIFGECP | YCSKPITLKM | SGRKH |
Funkcija
[uredi | uredi izvor]Klinički fenotip mutacijskih defekata u svim komplementarnim grupama Fanconijeve anemije (FA) je sličan. Ovaj fenotip karakterizira progresivno zatajenje koštane srži, sklonost kanceru i tipski urođeni defekti.[13] Glavni ćelijski fenotip je preosjetljivost na oštećenje DNK, posebno unakrsne veze DNK među lancima.[14] FA proteini interaguju putem višeproteinskog puta. Međulančane umrežene veze DNK su veoma štetna oštećenja koja se popravljaju homolognom rekombinacijom, uključujući koordinaciju FA proteina i "gena za osjetljivost na rak dojke 1 (BRCA1)".
Put popravka DNK kod Fanconijeve anemije (FA) je neophodan za prepoznavanje i popravku umreženih međulančanih DNK (ICL). Kritični korak na putu je monoubikvitinacija FANCD2, pomoću RING E3-ligaza FANCL. FANCL se sastoji od tri domena, RING domena koji je u interakciji sa E2 konjugirajućim enzimima, centralnog domena potrebnog za interakciju supstrata i N-termin alnog E2-likog nabora domena (ELF) koji komunicira sa FANCB.[15] ELF domen FANCL-a je također potreban da posreduje u nekovalentnoj interakciji između FANCL i ubikvitina. ELF domen je potrebna za podsgticanje efikasne monoubikvitinacije FANCD2 izazvane oštećenjem DNK u ćelijama kičmenjaka, što ukazuje na važnu funkciju FANCB i vezivanje ubikvitina od strane FANCL in vivo.[16]
Jedarni kompleks koji sadrži FANCL (kao i FANCA, FANCB, FANCC, FANCE, FANCF, FANCG i FANCM) je neophodna za aktivaciju FANCD2 proteina na monoubikvitiniranu izoformu.[6] U normalnim, nemutantnim, ćelijama FANCD2 je monoubikviniran kao odgovor na oštećenje DNK. Aktivirani protein FANCD2 kolokalizira se s BRCA1 (protein osjetljivosti na rak dojke) u žarištima izazvanim onizirajućim zračenjem i u sinaptonemskom kompleksu mejotskih hromosoma.
Reference
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- ^ a b c GRCm38: Ensembl release 89: ENSMUSG00000004018 - Ensembl, maj 2017
- ^ "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
- ^ "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
- ^ a b "Entrez Gene: FANCL Fanconi anemia, complementation group L".
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- ^ Park JY, Zhang F, Andreassen PR (2014). "PALB2: the hub of a network of tumor suppressors involved in DNA damage responses". Biochim. Biophys. Acta. 1846 (1): 263–75. doi:10.1016/j.bbcan.2014.06.003. PMC 4183126. PMID 24998779.
- ^ Chun J, Buechelmaier ES, Powell SN (2013). "Rad51 paralog complexes BCDX2 and CX3 act at different stages in the BRCA1-BRCA2-dependent homologous recombination pathway". Mol. Cell. Biol. 33 (2): 387–95. doi:10.1128/MCB.00465-12. PMC 3554112. PMID 23149936.
- ^ Walden, Helen; Deans, Andrew J. (2014). "The Fanconi anemia DNA repair pathway: structural and functional insights into a complex disorder". Annual Review of Biophysics. 43: 257–278. doi:10.1146/annurev-biophys-051013-022737. ISSN 1936-1238. PMID 24773018.
- ^ Deans, Andrew J.; West, Stephen C. (24. 6. 2011). "DNA interstrand crosslink repair and cancer". Nature Reviews. Cancer. 11 (7): 467–480. doi:10.1038/nrc3088. ISSN 1474-1768. PMC 3560328. PMID 21701511.
- ^ van Twest, Sylvie; Murphy, Vincent J.; Hodson, Charlotte; Tan, Winnie; Swuec, Paolo; O'Rourke, Julienne J.; Heierhorst, Jörg; Crismani, Wayne; Deans, Andrew J. (19. 1. 2017). "Mechanism of Ubiquitination and Deubiquitination in the Fanconi Anemia Pathway". Molecular Cell. 65 (2): 247–259. doi:10.1016/j.molcel.2016.11.005. ISSN 1097-4164. PMID 27986371.
- ^ Miles JA, Frost MG, Carroll E, Rowe ML, Howard MJ, Sidhu A, Chaugule VK, Alpi AF, Walden H (2015). "The Fanconi Anemia DNA Repair Pathway Is Regulated by an Interaction between Ubiquitin and the E2-like Fold Domain of FANCL". J. Biol. Chem. 290 (34): 20995–1006. doi:10.1074/jbc.M115.675835. PMC 4543658. PMID 26149689.
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