Summary for Early E1A 32 kDa protein (NES ID: 99)

Full Name
Adenoviral E1A     UniProt    
Alternative Names
None
Organism
Human adenovirus C serotype 5 (HAdV-5) (Human adenovirus 5)    
Experimental Evidence for CRM1-mediated Export
LMB Sensitive Ref.1A novel CRM1-dependent nuclear export signal in adenoviral E1A protein regulated by phosphorylation, Jiang et al., FASEB J, 2006
Mutations That Affect Nuclear Export
*highlighted yellow in the full sequence
V74A, I78A Ref.1A novel CRM1-dependent nuclear export signal in adenoviral E1A protein regulated by phosphorylation, Jiang et al., FASEB J, 2006
Mutations That Affect CRM1 Binding
Unknown
Functional Export Signals
*shown as underlined residues in the full sequence
62VSQIFPDSVMLAVQEGIDLL81 Ref.1A novel CRM1-dependent nuclear export signal in adenoviral E1A protein regulated by phosphorylation, Jiang et al., FASEB J, 2006
Secondary Structure of Export Signal
Unknown
Other Residues Important for Export
*shown as green residues in the full sequence
S89 Ref.1A novel CRM1-dependent nuclear export signal in adenoviral E1A protein regulated by phosphorylation, Jiang et al., FASEB J, 2006
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 
MRHIICHGGV ITEEMAASLL DQLIEEVLAD NLPPPSHFEP PTLHELYDLD VTAPEDPNEE 

        70         80         90        100        110        120 
AVSQIFPDSV MLAVQEGIDL LTFPPAPGSP EPPHLSRQPE QPEQRALGPV SMPNLVPEVI 

       130        140        150        160        170        180 
DLTCHEAGFP PSDDEDEEGE EFVLDYVEHP GHGCRSCHYH RRNTGDPDIM CSLCYMRTCG 

       190        200        210        220        230        240 
MFVYSPVSEP EPEPEPEPEP ARPTRRPKMA PAILRRPTSP VSRECNSSTD SCDSGPSNTP 

       250        260        270        280                       
PEIHPVVPLC PIKPVAVRVG GRRQAVECIE DLLNEPGQPL DLSCKRPRP
3D Structures in PDB
2KJE (NMR)
Comments
E1A interacts with many cellular proteins to inactivate or change their functions to facilitate viral replication. E1A is in both the cytoplasm and the nucleus. It is mostly nuclear early in viral infection but move to the cytoplasm at a late stage of infection. LMB inhibited this relocation. Its NES was mapped to residues 70-80. Single mutations of V70A, L72A or L80A did not affect NES activity. Only single mutations of V74A and I78A were effective. E1A is phosphorylated at multiple serine residues including S89 by kinase CDC2. Mutation of S89A or CDC2 inhibitor roscovitine decreased nuclear export. Mutation S89E reversed the roscovitine effect on E1A export. Adenovirus with E1A V74A mutation had 500-fold lower replication efficiency than wild type virus. Note that aa 43-51 and aa 249-257 also resemble the NES sequence. But they were shown to be non-functional.
References
[1]. "A novel CRM1-dependent nuclear export signal in adenoviral E1A protein regulated by phosphorylation"
Jiang H, Olson MV, Medrano DR, Lee OH, Xu J, Piao Y, Alonso MM, Gomez-Manzano C, Hung MC, Yung WK, Fueyo J. (2006) FASEB J, 20:E2098-E2107 PubMed
User Input
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