Summary for E1B-55K (NES ID: 34)

Full Name
E1B protein, large T-antigen     UniProt    
Alternative Names
E1B 55 kDa protein   
Organism
Human adenovirus C serotype 5 (HAdV-5) (Human adenovirus 5)    
Experimental Evidence for CRM1-mediated Export
LMB Sensitive Ref.1The adenovirus type 5 E1B-55K oncoprotein is a highly active shuttle protein and shuttling is independent of E4orf6, p53 and Mdm2, Kratzer et al., Oncogene, 2000
Mutations That Affect Nuclear Export
*highlighted yellow in the full sequence
L83A/L87A/L91A Ref.1The adenovirus type 5 E1B-55K oncoprotein is a highly active shuttle protein and shuttling is independent of E4orf6, p53 and Mdm2, Kratzer et al., Oncogene, 2000
Mutations That Affect CRM1 Binding
Unknown
Functional Export Signals
*shown as underlined residues in the full sequence
83LYPELRRILTI93 Ref.1The adenovirus type 5 E1B-55K oncoprotein is a highly active shuttle protein and shuttling is independent of E4orf6, p53 and Mdm2, Kratzer et al., Oncogene, 2000
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 
MERRNPSERG VPAGFSGHAS VESGCETQES PATVVFRPPG DNTDGGAAAA AGGSQAAAAG 

        70         80         90        100        110        120 
AEPMEPESRP GPSGMNVVQV AELYPELRRI LTITEDGQGL KGVKRERGAC EATEEARNLA 

       130        140        150        160        170        180 
FSLMTRHRPE CITFQQIKDN CANELDLLAQ KYSIEQLTTY WLQPGDDFEE AIRVYAKVAL 

       190        200        210        220        230        240 
RPDCKYKISK LVNIRNCCYI SGNGAEVEID TEDRVAFRCS MINMWPGVLG MDGVVIMNVR 

       250        260        270        280        290        300 
FTGPNFSGTV FLANTNLILH GVSFYGFNNT CVEAWTDVRV RGCAFYCCWK GVVCRPKSRA 

       310        320        330        340        350        360 
SIKKCLFERC TLGILSEGNS RVRHNVASDC GCFMLVKSVA VIKHNMVCGN CEDRASQMLT 

       370        380        390        400        410        420 
CSDGNCHLLK TIHVASHSRK AWPVFEHNIL TRCSLHLGNR RGVFLPYQCN LSHTKILLEP 

       430        440        450        460        470        480 
ESMSKVNLNG VFDMTMKIWK VLRYDETRTR CRPCECGGKH IRNQPVMLDV TEELRPDHLV 

       490                                                        
LACTRAEFGS SDEDTD
3D Structures in PDB
Not Available
Comments
E1B-55K in human adenoviruses promote viral replication by modulating nucleo-cytoplasmic mRNA export. Kräzer et al. studied the trafficking of E1B-55K and found that when transiently expressed, E1B-55K is predominantly cytoplasmic. Following LMB (or p21Rex-BFP) treatment, E1B-55K rapidly accumulate in the nucleus, independently of E4orf6, p53, or Mdm2. Sequence analysis suggested that aa 364-496 has a NLS, while a NES resides between aa 1-163. Fusion protein GST-E1B(83-93)-GFP was efficiently exported after microinjection, indicating that it is a functional NES. Triple mutations L83/L87/L91 to alanines abolishes export of both GST-E1B(83-93)-GFP, and the full-length protein. They also showed that overexpression of HIV-Rev or HTLV-Rex resulted in nuclear accumulation of E1B-55K, indicating that the retroviral proteins have a higher affinity for CRM1.
References
[1]. "The adenovirus type 5 E1B-55K oncoprotein is a highly active shuttle protein and shuttling is independent of E4orf6, p53 and Mdm2"
Krätzer, F., Rosorius, O., Heger, P., Hirschmann, N., Dobner, T., Hauber, J., Stauber, R.H.. (2000) Oncogene, 19:850-857 PubMed
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