Summary for hTERT (NES ID: 53)

Full Name
Telomerase reverse transcriptase     UniProt    
Alternative Names
Telomerase catalytic subunit
HEST2
Telomerase-associated protein 2 (TP2)   
Organism
Homo sapiens (Human)    
Experimental Evidence for CRM1-mediated Export
Mutations That Affect Nuclear Export
Unknown
Mutations That Affect CRM1 Binding
Functional Export Signals
Undetermined
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
MPRAPRCRAV RSLLRSHYRE VLPLATFVRR LGPQGWRLVQ RGDPAAFRAL VAQCLVCVPW
70 80 90 100 110 120
DARPPPAAPS FRQVSCLKEL VARVLQRLCE RGAKNVLAFG FALLDGARGG PPEAFTTSVR
130 140 150 160 170 180
SYLPNTVTDA LRGSGAWGLL LRRVGDDVLV HLLARCALFV LVAPSCAYQV CGPPLYQLGA
190 200 210 220 230 240
ATQARPPPHA SGPRRRLGCE RAWNHSVREA GVPLGLPAPG ARRRGGSASR SLPLPKRPRR
250 260 270 280 290 300
GAAPEPERTP VGQGSWAHPG RTRGPSDRGF CVVSPARPAE EATSLEGALS GTRHSHPSVG
310 320 330 340 350 360
RQHHAGPPST SRPPRPWDTP CPPVYAETKH FLYSSGDKEQ LRPSFLLSSL RPSLTGARRL
370 380 390 400 410 420
VETIFLGSRP WMPGTPRRLP RLPQRYWQMR PLFLELLGNH AQCPYGVLLK THCPLRAAVT
430 440 450 460 470 480
PAAGVCAREK PQGSVAAPEE EDTDPRRLVQ LLRQHSSPWQ VYGFVRACLR RLVPPGLWGS
490 500 510 520 530 540
RHNERRFLRN TKKFISLGKH AKLSLQELTW KMSVRDCAWL RRSPGVGCVP AAEHRLREEI
550 560 570 580 590 600
LAKFLHWLMS VYVVELLRSF FYVTETTFQK NRLFFYRKSV WSKLQSIGIR QHLKRVQLRE
610 620 630 640 650 660
LSEAEVRQHR EARPALLTSR LRFIPKPDGL RPIVNMDYVV GARTFRREKR AERLTSRVKA
670 680 690 700 710 720
LFSVLNYERA RRPGLLGASV LGLDDIHRAW RTFVLRVRAQ DPPPELYFVK VDVTGAYDTI
730 740 750 760 770 780
PQDRLTEVIA SIIKPQNTYC VRRYAVVQKA AHGHVRKAFK SHVSTLTDLQ PYMRQFVAHL
790 800 810 820 830 840
QETSPLRDAV VIEQSSSLNE ASSGLFDVFL RFMCHHAVRI RGKSYVQCQG IPQGSILSTL
850 860 870 880 890 900
LCSLCYGDME NKLFAGIRRD GLLLRLVDDF LLVTPHLTHA KTFLRTLVRG VPEYGCVVNL
910 920 930 940 950 960
RKTVVNFPVE DEALGGTAFV QMPAHGLFPW CGLLLDTRTL EVQSDYSSYA RTSIRASLTF
970 980 990 1000 1010 1020
NRGFKAGRNM RRKLFGVLRL KCHSLFLDLQ VNSLQTVCTN IYKILLLQAY RFHACVLQLP
1030 1040 1050 1060 1070 1080
FHQQVWKNPT FFLRVISDTA SLCYSILKAK NAGMSLGAKG AAGPLPSEAV QWLCHQAFLL
1090 1100 1110 1120 1130
KLTRHRVTYV PLLGSLRTAQ TQLSRKLPGT TLTALEAAAN PALPSDFKTI LD
3D Structures in PDB
Not Available
Comments
Telomerase catalyzes de novo synthesis of telomeres. The activity of telomerase is mainly regulated by transcriptional regulations of its catalytic subunit TERT, as well as by post-transcriptional and post-translational modifications. One such example is the interaction of hTERT with accessory proteins. Seimiya et al. demonstrated that 14-3-3 family protein is a hTERT binding partner. They interact via their respective C-termini. However, the N-terminal of 14-3-3 is required for the nuclear accumulation of hTERT. They further showed that aa 1030-1040 has a characteristic serine/threonine cluster, potentially forming an amphipathic helix, which is used to interact with 14-3-3. Mutant with T1030, S1037, and S1041 mutated to alanines failed to bind 14-3-3 and accumulates in the cytoplasm. They identified a putative NES in the aa 970-981 region. Using in vitro pull-down assay, they showed that hTERT(831-1132) can bind CRM1. Replacement of L974/L978/L980 with alanines abolished binding. Cytoplasmic accumulation, caused by either deletion of N-terminal of 14-3-3 or hTERT(L974A/L978A/L980A), can be reversed by LMB treatment. These evidence suggested that binding of 14-3-3 in dimer form, just upstream of NES, can mask the NES, disrupt nuclear export by CRM1, thus result in the nuclear localization of hTERT.
References
[1]. "Involvement of 14-3-3 proteins in nuclear localization of telomerase"
Seimiya, H., Sawada, H., Muramatsu, Y., Shimizu, M., Ohko, K., Yamane, K., Tsuruo, T. (2000) EMBO J, 19:2652-2661 PubMed
User Input
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