Summary for Topoisomerase II-alpha (NES ID: 121)

Full Name
DNA topoisomerase II, alpha isozyme     UniProt    
Alternative Names
None
Organism
Homo sapiens (Human)    
Experimental Evidence for CRM1-mediated Export
LMB Sensitive,  Binds CRM1 Ref.1Identification of functional nuclear export sequences in human topoisomerase IIalpha and beta., Mirski et al., Biochem Biophys Res Commun, 2003 Ref.2Topoisomerase II binds importin alpha isoforms and exportin/CRM1 but does not shuttle between the nucleus and cytoplasm in proliferating cells., Mirski et al., Exp Cell Res, 2007 Ref.3Human topoisomerase IIalpha nuclear export is mediated by two CRM-1-dependent nuclear export signals., Turner et al., J Cell Sci, 2004
Mutations That Affect Nuclear Export
*highlighted yellow in the full sequence
F1022A/L1025A, L1025A/L1027A, I1059A/I1063A Ref.1Identification of functional nuclear export sequences in human topoisomerase IIalpha and beta., Mirski et al., Biochem Biophys Res Commun, 2003 Ref.2Topoisomerase II binds importin alpha isoforms and exportin/CRM1 but does not shuttle between the nucleus and cytoplasm in proliferating cells., Mirski et al., Exp Cell Res, 2007 Ref.3Human topoisomerase IIalpha nuclear export is mediated by two CRM-1-dependent nuclear export signals., Turner et al., J Cell Sci, 2004
Mutations That Affect CRM1 Binding
Unknown
Functional Export Signals
*shown as underlined residues in the full sequence
1018ILRDFFELRLK1028, 1054FILEKIDGKIIIE1066 Ref.1Identification of functional nuclear export sequences in human topoisomerase IIalpha and beta., Mirski et al., Biochem Biophys Res Commun, 2003 Ref.2Topoisomerase II binds importin alpha isoforms and exportin/CRM1 but does not shuttle between the nucleus and cytoplasm in proliferating cells., Mirski et al., Exp Cell Res, 2007 Ref.3Human topoisomerase IIalpha nuclear export is mediated by two CRM-1-dependent nuclear export signals., Turner et al., J Cell Sci, 2004
Secondary Structure of Export Signal
Unknown
Other Residues Important for Export
Unknown
Sequence
Show FASTA Format Show Domain Info by CDD Show Secondary Structure by PSIPRED Show Conservation Score by AL2CO 
        10         20         30         40         50         60 
MEVSPLQPVN ENMQVNKIKK NEDAKKRLSV ERIYQKKTQL EHILLRPDTY IGSVELVTQQ 

        70         80         90        100        110        120 
MWVYDEDVGI NYREVTFVPG LYKIFDEILV NAADNKQRDP KMSCIRVTID PENNLISIWN 

       130        140        150        160        170        180 
NGKGIPVVEH KVEKMYVPAL IFGQLLTSSN YDDDEKKVTG GRNGYGAKLC NIFSTKFTVE 

       190        200        210        220        230        240 
TASREYKKMF KQTWMDNMGR AGEMELKPFN GEDYTCITFQ PDLSKFKMQS LDKDIVALMV 

       250        260        270        280        290        300 
RRAYDIAGST KDVKVFLNGN KLPVKGFRSY VDMYLKDKLD ETGNSLKVIH EQVNHRWEVC 

       310        320        330        340        350        360 
LTMSEKGFQQ ISFVNSIATS KGGRHVDYVA DQIVTKLVDV VKKKNKGGVA VKAHQVKNHM 

       370        380        390        400        410        420 
WIFVNALIEN PTFDSQTKEN MTLQPKSFGS TCQLSEKFIK AAIGCGIVES ILNWVKFKAQ 

       430        440        450        460        470        480 
VQLNKKCSAV KHNRIKGIPK LDDANDAGGR NSTECTLILT EGDSAKTLAV SGLGVVGRDK 

       490        500        510        520        530        540 
YGVFPLRGKI LNVREASHKQ IMENAEINNI IKIVGLQYKK NYEDEDSLKT LRYGKIMIMT 

       550        560        570        580        590        600 
DQDQDGSHIK GLLINFIHHN WPSLLRHRFL EEFITPIVKV SKNKQEMAFY SLPEFEEWKS 

       610        620        630        640        650        660 
STPNHKKWKV KYYKGLGTST SKEAKEYFAD MKRHRIQFKY SGPEDDAAIS LAFSKKQIDD 

       670        680        690        700        710        720 
RKEWLTNFME DRRQRKLLGL PEDYLYGQTT TYLTYNDFIN KELILFSNSD NERSIPSMVD 

       730        740        750        760        770        780 
GLKPGQRKVL FTCFKRNDKR EVKVAQLAGS VAEMSSYHHG EMSLMMTIIN LAQNFVGSNN 

       790        800        810        820        830        840 
LNLLQPIGQF GTRLHGGKDS ASPRYIFTML SSLARLLFPP KDDHTLKFLY DDNQRVEPEW 

       850        860        870        880        890        900 
YIPIIPMVLI NGAEGIGTGW SCKIPNFDVR EIVNNIRRLM DGEEPLPMLP SYKNFKGTIE 

       910        920        930        940        950        960 
ELAPNQYVIS GEVAILNSTT IEISELPVRT WTQTYKEQVL EPMLNGTEKT PPLITDYREY 

       970        980        990       1000       1010       1020 
HTDTTVKFVV KMTEEKLAEA ERVGLHKVFK LQTSLTCNSM VLFDHVGCLK KYDTVLDILR 

      1030       1040       1050       1060       1070       1080 
DFFELRLKYY GLRKEWLLGM LGAESAKLNN QARFILEKID GKIIIENKPK KELIKVLIQR 

      1090       1100       1110       1120       1130       1140 
GYDSDPVKAW KEAQQKVPDE EENEESDNEK ETEKSDSVTD SGPTFNYLLD MPLWYLTKEK 

      1150       1160       1170       1180       1190       1200 
KDELCRLRNE KEQELDTLKR KSPSDLWKED LATFIEELEA VEAKEKQDEQ VGLPGKGGKA 

      1210       1220       1230       1240       1250       1260 
KGKKTQMAEV LPSPRGQRVI PRITIEMKAE AEKKNKKKIK NENTEGSPQE DGVELEGLKQ 

      1270       1280       1290       1300       1310       1320 
RLEKKQKREP GTKTKKQTTL AFKPIKKGKK RNPWSDSESD RSSDESNFDV PPRETEPRRA 

      1330       1340       1350       1360       1370       1380 
ATKTKFTMDL DSDEDFSDFD EKTDDEDFVP SDASPPKTKT SPKLSNKELK PQKSVVSDLE 

      1390       1400       1410       1420       1430       1440 
ADDVKGSVPL SSSPPATHFP DETEITNPVP KKNVTVKKTA AKSQSSTSTT GAKKRAAPKG 

      1450       1460       1470       1480       1490       1500 
TKRDPALNSG VSQKPDPAKT KNRRKRKPST SDDSDSNFEK IVSKAVTSKK SKGESDDFHM 

      1510       1520       1530                                  
DFDSAVAPRA KSVRAKKPIK YLEESDEDDL F
3D Structures in PDB
1BGW (X-Ray,2.70 Å resolution)
1BJT (X-Ray,2.50 Å resolution)
2RGR (X-Ray,3.00 Å resolution)
Comments
Topoisomerase II relieves DNA torsional stress in replication and transcription. Topoisomerase IIα and IIβ are the two isoforms in humans with 78% identity. Topo IIα and β are both targets for anticancer drugs. Mirski et al (BBRC, 2003) found that 1018-1028 of Topo IIα could target GST-GFP out of the nucleus. Mirski et al. 2007 further showed that recombinant Topoisomerase IIα bound recombinant CRM1 in GST-pulldown assay in the presence of RanGTP, but the protein does not shuttle between the nucleus and the cytoplasm in proliferating cells (heterokaryon shuttling experiments). Turner et al. found another NES (residues 1054-1066) in Topo IIα
Doubt about NES: Peptide at 1051-1070 failed to bind CRM1 in GST-pulldown assay (Chook lab, unpublished results).
References
[1]. "Identification of functional nuclear export sequences in human topoisomerase IIalpha and beta."
Mirski SE, Bielawski JC, Cole SP (2003) Biochem Biophys Res Commun, 306:905-11 PubMed
[2]. "Topoisomerase II binds importin alpha isoforms and exportin/CRM1 but does not shuttle between the nucleus and cytoplasm in proliferating cells."
Mirski SE, Sparks KE, Friedrich B, Kohler M, Mo YY, Beck WT, Cole SP (2007) Exp Cell Res, 313:627-37 PubMed
[3]. "Human topoisomerase IIalpha nuclear export is mediated by two CRM-1-dependent nuclear export signals."
Turner JG, Engel R, Derderian JA, Jove R, Sullivan DM (2004) J Cell Sci, 117:3061-71 PubMed
User Input
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