Summary for DDX3X (NES ID: 303)

Full Name
ATP-dependent RNA helicase DDX3X     UniProt    
Alternative Names
CAP-Rf, DEAD box protein 3, X-chromosomal, DEAD box, X isoform (DBX), Helicase-like protein 2 (HLP)   
Organism
Homo sapiens (Human)    
Experimental Evidence for CRM1-mediated Export
LMB Sensitive,  Binds CRM1 Ref.1Exportin-1-Dependent Nuclear Export of DEAD-box Helicase DDX3X Is Central to Its Role in Antiviral Immunity, Heaton et al., Cells, 2019 Ref.2Investigating Nucleo-Cytoplasmic Shuttling of the Human DEAD-box Helicase DDX3, Brennan et al., Eur J Cell Biol, 2018
Mutations That Affect Nuclear Export
*highlighted yellow in the full sequence
1MSHVAVENALGLDQQFAGLDLN22 by Deletion, L19A/L21A, L12A/F16A/L19A/L21A Ref.1Exportin-1-Dependent Nuclear Export of DEAD-box Helicase DDX3X Is Central to Its Role in Antiviral Immunity, Heaton et al., Cells, 2019 Ref.2Investigating Nucleo-Cytoplasmic Shuttling of the Human DEAD-box Helicase DDX3, Brennan et al., Eur J Cell Biol, 2018
Mutations That Affect CRM1 Binding
Unknown
Functional Export Signals
*shown as underlined residues in the full sequence
1MSHVAVENALGLDQQFAGLDLN22 Ref.2Investigating Nucleo-Cytoplasmic Shuttling of the Human DEAD-box Helicase DDX3, Brennan et al., Eur J Cell Biol, 2018
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 
MSHVAVENAL GLDQQFAGLD LNSSDNQSGG STASKGRYIP PHLRNREATK GFYDKDSSGW 

        70         80         90        100        110        120 
SSSKDKDAYS SFGSRSDSRG KSSFFSDRGS GSRGRFDDRG RSDYDGIGSR GDRSGFGKFE 

       130        140        150        160        170        180 
RGGNSRWCDK SDEDDWSKPL PPSERLEQEL FSGGNTGINF EKYDDIPVEA TGNNCPPHIE 

       190        200        210        220        230        240 
SFSDVEMGEI IMGNIELTRY TRPTPVQKHA IPIIKEKRDL MACAQTGSGK TAAFLLPILS 

       250        260        270        280        290        300 
QIYSDGPGEA LRAMKENGRY GRRKQYPISL VLAPTRELAV QIYEEARKFS YRSRVRPCVV 

       310        320        330        340        350        360 
YGGADIGQQI RDLERGCHLL VATPGRLVDM MERGKIGLDF CKYLVLDEAD RMLDMGFEPQ 

       370        380        390        400        410        420 
IRRIVEQDTM PPKGVRHTMM FSATFPKEIQ MLARDFLDEY IFLAVGRVGS TSENITQKVV 

       430        440        450        460        470        480 
WVEESDKRSF LLDLLNATGK DSLTLVFVET KKGADSLEDF LYHEGYACTS IHGDRSQRDR 

       490        500        510        520        530        540 
EEALHQFRSG KSPILVATAV AARGLDISNV KHVINFDLPS DIEEYVHRIG RTGRVGNLGL 

       550        560        570        580        590        600 
ATSFFNERNI NITKDLLDLL VEAKQEVPSW LENMAYEHHY KGSSRGRSKS SRFSGGFGAR 

       610        620        630        640        650        660 
DYRQSSGASS SSFSSSRASS SRSGGGGHGS SRGFGGGGYG GFYNSDGYGG NYNSQGVDWW 

                                                                  
GN
3D Structures in PDB
3JRV (X-Ray,1.6 Å resolution)
6O5F (X-Ray,2.5 Å resolution)
Comments
DDX3X regulates antiviral response mediated by the RIG-I-like receptor (RLR). It is also important in viral replication, such as of HIV-1. Its ability to shuttle between the nucleus and the cytoplasm seems to be important for these functions. Previously, putative NESs have been proposed to be in the C-terminus. Both Brennan et al. and Heaton et al. showed that C-terminal deletion have no effect on localization and the protein is still LMB sensitive. They found that the NES is in the N-terminal region instead, and found a putative NES in residues 1-22. NES mutations on full length and C-terminal truncated protein both caused nuclear accumulation. Both studies showed CRM1 interaction by co-IP. Heaton et al. further demonstrated N-terminal NES dependent binding of DDX3X to CRM1 and RanGTP by AUC. Nuclear export defective DDX3X cannot protect against viral hPIV-3 infection, suggesting that CRM1 function is important for infection.
References
[1]. "Exportin-1-Dependent Nuclear Export of DEAD-box Helicase DDX3X Is Central to Its Role in Antiviral Immunity"
Heaton SM, Atkinson SC, Sweeney MN, Yang SNY, Jans DA, Borg NA. (2019) Cells, 8(10):1181-1202 PubMed
[2]. "Investigating Nucleo-Cytoplasmic Shuttling of the Human DEAD-box Helicase DDX3"
Brennan R, Haap-Hoff A, Gu L, Gautier V, Long A, Schrder M. (2018) Eur J Cell Biol, 97(7):501-511 PubMed
User Input
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